Quadrature photo-receiving device
SUBSTANCE: invention is related to optoelectronics and interferometry and intended for measurement of spatial distribution of light intensity in interference field formed by counter luminous fluxes. Quadrature photo-receiving device contains photodetector including four interferentially sensitive photoelectric element, two of which are reference ones. Difference of optical distances from the first photoelectric element to the plane that is perpendicular to measured luminous flux and that limits optically distant surface of photodetector for the first photoelectric element and from i-photoelectric element to this plane is calculated from the proposed formula, signals from odd photoelectric elements of photodetector being supplied to appropriate inlets of the first differential amplifier, and signals from even photoelectric elements of photodetector to appropriate inlets of the second differential amplifier.
EFFECT: increase in ratio signal/noise of quadrature photodetector, reduction of interference caused by permanent component of luminous flux (rather than by interferential component), reduction of interference caused by interferential component of luminous flux on lengths of waves that are different from length of registered radiation wave.
The invention relates to optoelectronics and interferometry is to measure the spatial distribution of light intensity in the interference field formed by the opposing light waves.
Known photodetector [EN 2243615]. However, the known sensor has the following disadvantages: this sensor cannot register the quadrature signals in the interference field formed by the opposing light flows.
Known quadrature photodetector [US 4443107]containing a photodetector, comprising three detectors, two of which - interferenceand-sensitive photoelectric elements, and the third reference, two differential amplifier, one input of each of which is fed the signal from the reference detector of a sensor, and each second input of the amplifier the signal from the corresponding interferention-sensitive element of the photodetector [US 4443107 - 7].
This device is a prototype of the invention.
However, this device has the following disadvantages:
a) when the subtraction signal interferention-sensitive solar cell and the reference detector is a decrease in the signal-to-noise ratio. The reference detector is used to compensate for the constant "dark" current. Therefore, he has a "dark" current equal to "Temnov the mu current interferention-sensitive photocell. "Dark" current is the main source of noise of any detector. The output of the differential amplifier ratio signal/noise is reduced because thermal noise interferention-sensitive solar cell and the reference detector are weakly correlated and are not deducted and are added together and the signal due to the reference detector is not added because it never registers the light.
b) because the detector does not register the light, then there is no compensation for the interference caused by the constant component of the luminous flux (not the interference component).
in the photoreceiver has no selectivity for the wavelength to the interference light signal.
The technical result of the invention is to increase the signal-to-noise quadrature photodetector, reducing interference caused constant component of the luminous flux (not the interference component), the reduction of interference caused by the interference component of the light flux at wavelengths that are not multiples of the wavelength of the detected radiation.
The technical result is achieved by the fact that in quadrature photodetector device containing a photodetector, comprising three detectors, two of which - interferenceand-sensitive photoelectric elements, and the third reference, two differential amplifier, n is one input of each of which is fed the signal from the reference detector of a sensor, and each second input of the amplifier the signal from the corresponding interferention-sensitive element of the photodetector, it is new that the photodetector has four interferention sensitive photoelectric cells, two of which are reference, and the difference of optical distances from the first photovoltaic element to the plane perpendicular to the measured luminous flux and optical limiting far for the first photovoltaic element surface of the photodetector, and from the i-th photoelectric element to this plane is equal to
λ the wavelength of the detected radiation;
i=2, 3, 4 is the number of the photovoltaic element;
ki- any integers,
the signals from the odd-numbered photoelectric elements of the photodetector serves to corresponding inputs of a first differential amplifier, and the signals from the even-numbered photoelectric elements of the photodetector to corresponding inputs of the second differential amplifier.
The invention is illustrated by drawings, where figure 1 shows the structural diagram of the quadrature photodetector device. Figure 2 shows a photograph of the vacuum quadrature photodetector, which are an example of performing quadrature fotopriemnik the and. Figure 3 shows the schematic drawing of the cathode box with the cathodes of the vacuum quadrature photodetector. 4 shows an interferometer, which employs vacuum quadrature photodetector. Figure 5 shows the graphs of dependences of stress from time obtained when working quadrature photodetector in the composition of the interferometer.
Quadrature photodetector operates as follows. Interferention-sensitive photoelectric elements 1, 2, 3, 4 sensor 5 (Fig 1) are in the interference field formed by opposing coherent light flows S1and S2with planar wave fronts parallel to the photosensitive elements. A luminous flux of S1may be a luminous flux of S2that passes through the photodetector 5 and reflected from the flat mirror.
The first photoelectric element is located at an optical distance from a plane perpendicular to the measured luminous flux and optical limiting far for the first photovoltaic element surface of the photodetector, is equal to l1optand each i-th photoelectric element is located at an optical distance from this plane, is equal to
The signals from the odd-numbered photoelectric elements are received at the inputs of differential the territorial amplifier 6, and even to the inputs of the differential amplifier 7.
Counter luminous flux of S1and S2form an interference field, the intensity of which varies along the direction of propagation of sinusoidal with a period equal to λ/2.
In uniform motion relative to each other along the direction of propagation of light beams, the photodetector and the interference field at the outputs of the photodetector are formed four sinusoidal signal. If you take the phase shift of the signal formed by the first photovoltaic element, zero, the remaining three signals of the photodetector have a phase shift ϕ2=2k1π+π/2, ϕ3=2k2π+π, ϕ4=2k3π+π+π/2.
The outputs of the differential amplifiers 6 and 7 are formed signals Sϕ=0and Sϕ=π/2which have a mutual phase shift π/2. The inputs of the differential amplifier receives signals in which the interference component at the wavelength of the detected radiation is out of phase, i.e. at the output of the differential amplifier is a signal in which the interference component at the wavelength of the detected radiation is formed, and the constant components formed through reinterpreting component (what amnuay current, the backlight) is deducted. Because each interferention-sensitive photoelectric element gives the contribution to the signal is proportional to its effective volume reduction of the signal-to-noise does not occur, compared with the ratio signal/noise, obtained from a single photovoltaic element doubled the effective volume. [Alexander A. Ivanenko, Nick P.Shestakov, Anatoly M.Sysoev, Vasily F.Shabanov, "New photodetector - meter of the correlation function of optical signals", Proceeding of the SCI-2003, V.10, pp.124-129].
Attenuated and the interference component at wavelengths different from the wavelength of the detected radiation, in which the phase difference of the signals at the inputs of the differential amplifiers is different from 180° [Alexander A. Ivanenko, Vasily F. Shabanov, Anatoly M. Sysoev, Nikolay P. Shestakov, Interference sensitive selective photodetector. Proceedings of SPIE/Ukraine Volume 6, No.1-6, p.480-488, 2006. (Current Research in Optics and Photonics: Selected Papers from the International Conference on Advanced Optoelectronics &Lasers (2005))]. I.e. doubling of the signals at these wavelengths does not occur, in contrast to signals on the wavelength of the detected radiation.
On this principle was developed vacuum quadrature photodetector 2 is on the external photoelectric effect. The cathode box 3 the photodetector contains: 1, 2, 3, 4 - electrodes photocathodes, 5, 6, 7, 8 - photocathodes, 9 - layer MgF2optical thickness λ/8, 10 - layer MgF2optical thickness λ/4, 11 - layer MgF2the optical thickness of 3λ/8.
Vacuum the quadrature sensor was tested in the interferometer 4. The beam of a helium-neon laser 1 passes through the vacuum quadrature photodetector 2, falls on the mirror 3 fixed to the piezoelectric element 4, and then is reflected and again passes through the photodetector 2. Between the mirror and the laser is formed a standing light wave with a sinusoidal intensity distribution along the propagation rays.
Figure 5 shows the graphs of dependences of stress from time to time, received at this facility. Figure 1 shows the dependence of the voltage on the piezoelectric element of time, which has a triangular shape. According 2-5 signals at the inputs of the differential amplifiers are about 2 times smaller amplitude than the quadrature signals 6, 7 on the outputs of the differential amplifiers.
Quadrature photodetector capable of measuring displacements with respect to the direction of movement, with high resolution. The device is intended for interferometers with a counter direction of the rays in the registration.
The work was supported by INTAS Ref. No. 04-80-6791.
Quadrature photodetector containing a photodetector, comprising three detectors, two of which - interferenceand-sensitive photoelectric elements, and a third anchor, two differential amplifier, one input of each of which the signal from a reference photo detector is a receiver, and each second input of the amplifier the signal from the corresponding interferention-sensitive element of the photodetector, wherein the photodetector has four interferention-sensitive photoelectric cells, two of which are reference, and the difference of optical distances from the first photovoltaic element to the plane perpendicular to the measured luminous flux and optical limiting far for the first photovoltaic element surface of the photodetector and from the i-th photoelectric element to this plane, is equal to
where λ the wavelength of the detected radiation;
i=2, 3, 4 is the number of the photovoltaic element;
ki- any integers, while the signals from the odd-numbered photoelectric elements of the photodetector serves to corresponding inputs of a first differential amplifier, and the signals from the even-numbered photoelectric elements of the photodetector to corresponding inputs of the second differential amplifier.
FIELD: electricity; heating.
SUBSTANCE: method is based on dividing of taking from distant object of luminous flux for two current of equal intensity with further forming from it optical beams of wedge shape, tapering in propagation direction and common edge on its tops, located in zone of optical emission converter. Concentrator system for implementation of method contains two elliptic reflector of sulcate shape for supplying of concentrated emission to the extensive emission converter and located between reflectors two reflective plates of parabolic section. The first focal lines of reflectors and plates overlapped in pairs, and the second focal line of reflectors are located in area of extensive emission converter.
EFFECT: productivity improvement by means of cross section area of converted optical emission.
6 cl, 3 dwg
SUBSTANCE: invention concerns computer vision facilities and can be used in high-sensitivity video and photo cameras, in particular for three-dimensional image registration. Photodetector contains avalanche photodiode provided on silicon substrate of first conductivity type including the first near-surface region of second conductivity type connected to the first contact of photodiode, under-located regions of photocurrent generation and multiplication and related photocurrent area surrounded by stopper area, near-surface region of first conductivity type, connected to the second contact of photodiode, integrated reading circuit provided on the same substrate and connected to the second contact of photodiode through common electrode, and to the first contact of photodiode through its input. Stopper area is made as pockets region of second conductivity type representing a segment of integrated reading circuit. Regions of photocurrent generation and multiplication are made within substrate area separated by embedded area of first conductivity type. Input of integrated reading circuit is connected to the first electrode of photodiode through blocking capacitor formed by two electrodes of two layers of metal interconnections of integrated blocking capacitor intermediate insulator, and, through additional circuit of signal formation including two MOS transistors, to channels of first conductivity type. The first transistor is connected by sink to input of reading circuit, by gate and source to the first electrode of power supply of the integrated reading circuit. The second transistor is connected by sink to input of reading circuit, by gate to the second electrode of power supply, and by source to blocking capacitor through resistor.
EFFECT: improved homogeneity of parameters of avalanche photodiodes in multielement IC of photodetector and increased reliability.
FIELD: physics; illumination.
SUBSTANCE: solar battery (SB) panel consists of frame, net to mount and fix photoconverters (PC), PC and substrates designed as modules. Net consists of strings crossed in orthogonal directions and elastically stretched fixed on frame. Modules are mounted over strings and attached to strings in knots of their crossing by fasteners. String pitch dimension provides arrangement of knots of string crossing under PC. Fastener (holder) is designed as integral disk furnished with string cavities on the side adjoining to the back side of modules. Fasteners (holders) are connected (pasted together) with strings on cavity surfaces, and, from the back side of modules, on flat surfaces between cavities.
EFFECT: increased specific solar battery power; reduced laboriousness and simplified solar battery panel manufacturing techniques.
FIELD: processes; physics.
SUBSTANCE: method of producing photodiodes on crystals of indium antimonid of n-type conductivity includes preparation the wafer of initial indium antimonid crystal, generation of p-n pass by implantation beryllium ions with post-implantation annealing, application of protective and stabilise dielectric films and generating of contact combination. According to invention there are used wafers of initial indium antimonid crystal with impurity density 6·1013-2·1014 cm-3, implantation of beryllium ions is implemented at energy 20-40 keV and implantation dose (0.8 - 1.2)·1014 cm-3, post-implantation annealing is implemented fixed at temperature 350-375°C during 20-30 minutes with surface encapsulate film SiO2.
EFFECT: increasing of photodiodes current sensitivity.
SUBSTANCE: invention can be used in the manufacture of solar photo cells. The converter under the invention contains at least one photosensitive layer providing generation of a photocurrent with the absorption of electromagnetic radiation, and also current-tap electrodes. The converter also contains metallic nano-particles with the size of the order of or less than the wavelength in the maximum of the spectrum of the falling radiation, ensuring the concentration of falling radiation in a nearby zone next to the nano-particles and generation of a photocurrent at absorption of the specified radiation. Strengthening of the photocurrent and efficiency upgrading of the converter as a result is provided.
EFFECT: increase in the photocurrent and efficiency upgrading of the converter of the electromagnetic radiation.
23 cl, 6 dwg
SUBSTANCE: invention can be used in the production of solar photo cells. The hetero-electric photo cell, which converts into electrical energy the electromagnetic radiation falling on it contains layers of the semiconductor located on a metallic plate of p- and n-type with pn as the transition between them, introduced into the n-type semiconductor nano-particles of metal of the size less than the wavelength of the specified radiation at concentration specified for the nano-particles in the specified layer (1-5) 10-2 of the volume fractions. In the specified layer of the semiconductor of n-type nano-particles are enclosed in a shell having the form similar to the form of the surface specified nano-particles, made from a polymer, for example, PVP (poly 2-vinylpyridine), with a thickness of the characteristic size specified nano-particles. The invention makes it possible to substantially increase efficiency.
EFFECT: improved efficiency in the solar photo cells.
2 cl, 2 dwg
SUBSTANCE: photo-converter with a bilateral working surface made from plates of silicon contains diode structures with n+-p (p+-n) transition to the frontal surface of a silicon plate and isotypic p-p+ (n-n+) transitions to the base area on a back surface of a silicon plate at which the areas and configurations of metallic contacts on frontal and back surfaces coincide with the plan, and the thickness of the photo-converter is commensurable with the diffusion length of the minor carriers of current in the base region. The diode structures are made in the form of separate commuted contact sections combined into the plan on the front and back surfaces with the sites on which contacts are put. The distance between separate neighbouring sections with n+-p (p+-n) transition on the front surface does not exceed double the diffusion length of the minor carriers of current in the base region, and on the frontal surface, free from n+-p (p+-n) transition, and on the back surface, free from contacts, a passivating, anti-reflecting is located. In the second version the said photo-converter has the same construction as in the first variant and additionally on the passivating anti-reflecting film from the front and back sides are situated nano-clusters with the linear size of 10-100 nm from the metallic atoms, the distance between which 2-4 times exceeds the sizes of the nano-clusters. Methods of manufacturing of both variants of photo-converters are also proposed.
EFFECT: reduction in the cost and increase in efficiency of photo-converters.
5 cl, 3 dwg
SUBSTANCE: method of obtaining photosensitive structure containing a plate of p-type monocrystal silicon with n-type front layer and p-n heterojunction involves joint heating of p-type monocrystal silicon substrate covered with target material, and synthesis of front layer with heterojunction. Target material is a solid porous carbonaceous material with porosity under 15% of volume, previously undergone thermal processing in contact with silicon at 1100-1350°C for 10-20 minutes; the synthesis is conducted at 1100-1250°C; a gap between carbonaceous material and p-type monocrystal silicon plate is not more than 8 micron.
EFFECT: allows obtaining heterostructure with high photosensitivity in the short-wave spectre range.
2 cl, 1 tbl, 8 dwg
SUBSTANCE: process of manufacturing of cadmium sulphide CdS photoconductive radiation-proof films with injection of lead sulphide PbS includes thermal processing of the film. Before the thermal processing at least one monolayer of fatty acid lead-containing salt is formed by Langmuir-Blodgett technique at the CdS film surface, and the thermal processing continues till obtaining regular distribution of PbS injections in the depth of CdS film.
EFFECT: obtained photosensitive films feature better radiation-proof parameters and at the same time preserve high photosensitivity in the visible frequency band.
4 cl, 4 dwg, 4 tbl
SUBSTANCE: system for electric power generation consists of matrix of one or more conversion modules, which are connected in series or in parallel, every of which consists of: combustion chamber, injection device, which is connected to combustion chamber by means of injection tube, injection frequency controller, facility of substance supply that sustains combustion in combustion chamber, facility of gaseous combustion products exhaust, facility of selective radiation shedding onto external surface of combustion chamber, facility of radiation energy conversion into electric energy, facility of combustion reaction ignition, at that combustion chamber is installed in conversion chamber, inside of which subatmosphere pressure conditions are maintained so that significant part of heat, which is generated by combustion reaction, is converted to electromagnetic radiation.
EFFECT: invention provides high efficiency of thermal energy conversion to electric energy.
23 cl, 2 dwg
SUBSTANCE: device for monitoring of spacer grids contains the following elements that are serially installed on optical axis: source of coherent radiation, shaper of structural lighting, device of spacer grid positioning and photo-receiving module, which includes lens and photo-receiving chamber with matrix photodetector, which is connected with unit of control and information processing, the control outlet of which is connected to positioning device. Shaper of structural lighting is arranged in the form of diffraction optical element on the basis of phase or/and amplitude microstructure on transparent wafer, which contains non-transparent area installed in the center of diffraction optical element, working field that shapes the system of light strips on the surface of monitored fragment of spacer grid, and alignment field that shapes two light rings of the same diameter as the working field, for alignment of photo-receiving module.
EFFECT: simplification of device design with simultaneous expansion of functional resources and increase of its fast-action.
SUBSTANCE: method of contactless control of three-dimensional object linear dimensions implies that multiple sounding structured illuminations are formed on surface of controllable object by lighting surface of controllable object with optical radiation beam, every time controlling spatial modulation of optical radiation beam intensity. Besides, method includes consecutive registration of images of sounding illumination structure distorted by surface relief of controlled object and heighting of surface relief of controlled object by distortion of sounding illumination structure image and by two other coordinates that is by position of illumination structure distortions in registered images. For each point of controlled object dependence of registered radiation intensity on image number is estimated. Dependences obtained within calibration surface calibrating, of registered radiation intensity on image number are used for calibration surface points at its various distances to surface considered as reference. Heighting of surface relief of controlled object is evaluated by distance from reference surface to calibration surface point where dependence of registered radiation intensity on image number is most similar to dependence in analysed point of controlled object.
EFFECT: improved accuracy of three-dimensional object linear dimensions control and expansion of monitoring procedure possibilities.
FIELD: physics, measurements.
SUBSTANCE: invention pertains to the field of investigating properties of materials. The device consists of holding equipment and equipment for loading the sample, reading equipment and equipment for recording deformation values. The equipment for reading the deformation values is an optical-mechanical device and consists of a control pointer fitted with an infrared diode for controlling the width of the deformation sample. The pointer is made with provision for regulating its position relative the zero reading line. The pointer can be displaced through a threaded mechanical transmission. The position of the pointer is read by an optoelectronic linear displacement converter. Constant contact dynamic interaction of the control pointer with the surface of the sample provides for straightening the spiral edge formed. The equipment for recording values of transverse deformation consists of a microprocessor linked to the optical mechanical measuring system through an interface unit.
EFFECT: increased technological capabilities of investigating deformation properties of easily deformed materials and increased accuracy of measuring transverse deformation.
FIELD: instrument engineering.
SUBSTANCE: instrument is comprised of basic plate and active laser material fixed between polarised separating prism and partially transmitting mirror. Mirror is mounted onto basic plate so that one part of radiation is reflected by mirror in auto collimation manner and the other is transmitted to photo sensor installed behind mirror when optical radiation comes out of active laser material. Differential frequency measuring unit is connected to photo sensor outputs. Two mirrors are fixed fast to basic plate at equal distance from beam separation point in polarised prism. Two-sided mirror is fixed to piezo-element, which is connected with modular oscillation generator output. Piezo-element is mounted on independent base. When optical radiation from polarised prism hits mirrors, reflected from mirrors beams are directed towards each other and along common direct line, and two-sided mirror is installed perpendicular to the above line and at equal distance from mirrors with the use of piezo-element and independent base.
EFFECT: improvement of seismic distortions measurement sensitivity.
SUBSTANCE: panoramic sensor of angular coordinate of light checkpoint includes multielement receiver of optical radiation consisting of at least three elemental photo receivers, and signal processing device for defining angular coordinate of checkpoint. Elemental photo receivers are set in circle at regular pace. Number of lit elemental photo receivers within a single unit does not depend on the direction of light checkpoint at a given plane in the sensor coordinate system. Angular coordinate of checkpoint is defined either by order numbers of end elemental receivers in the lit group of photo receivers or by correlation of signal size at any two lit photo receivers, possibly adjoining ones.
EFFECT: viewing field extension for sensor angular coordinate of a light checkpoint.
FIELD: structure monitoring device.
SUBSTANCE: device consists of a basic carrier cable laid along the whole of the pipeline; there are four distribution location each of them containing four individual optical fibres which are virtually taps of the cable aforesaid laid around the flow string at 90° angles, each of the above optical fibres containing multiple strain sensors arranged along the flow string axis at a 90° angle relative to each other and in a circumferential direction relative to the flow string.
EFFECT: facilitated collection of data on the pipeline strain and deformation with the help of an optical fibre.
7 cl, 25 dwg
FIELD: technological processes.
SUBSTANCE: method includes tunnel separation in sections for working length of laser beam, installation of laser radiation source in tunnel, and installation of target with target homing guidance, scanning range finder, temperature recorder and video camera onto trolley. Then laying of laser beam in target centre is done with the help of homing guidance mechanism, and trolley position is fixed as origin datum with the help of laser beam. After that tunnel technical condition is measured with gauges, results are input into computer, trolley with target and gauges are moved to the following position, its position is fixed with the help of laser beam, measurements are done with gauges, results are input in computer, similarly measurements are done within the limits of the whole section. The source of laser radiation is placed on the border of every section and measurements are repeated until the whole of the tunnel is passed through. Basing on results of all measurements, the virtual basic framework of tunnel technical condition is formed. Tunnel technical condition measurements are done with set periodicity in time, and similar virtual frameworks are created, results of measurements are compared with results of virtual basic framework and tunnel technical condition is determined. Sources of laser radiation may be installed either on stationary devices or on movable trolleys. In order to increase working length of laser beam, a focusing lens is installed.
EFFECT: improves accuracy and provides more detailed information on object condition; possibility to perform measurements of lengthy objects.
3 cl, 1 dwg
FIELD: physics, optics.
SUBSTANCE: invention refers to optoelectronic devices and can be used for an object area measurement. The instrument comprises lens, scanning element, two photodetectors and signal processing circuit. Scanning element comprises two parallel disks with drives. The disks with helically arranged holes can rotate in front of the photodetectors. Signal processing circuit contains two triggers, three AND gates, two comparators, counter, indicator, "Start" and "Reset" pushbuttons, synchronizer connected with the disk drives, and "Start" pulse shortening unit. Input of the "Start" pulse shortening unit is connected with output of "Start" pushbutton, and the units' output is connected with direct input of the first trigger. The first trigger output is connected with the first input of the first AND gate and inverting input of the second AND gate. The second input of the first AND gate and direct input of the second AND gate is connected with the second photodetector through the first comparator, and the second photodetector is connected with the second disk of the scanning element. The outputs of the first and the second AND gates are connected with direct and inverting inputs of the second trigger, correspondingly. The second trigger's output is connected with the first input of the third AND gate. The second input of the third AND gate is connected with the first photodetector through the second comparator, and the first photodetector is connected with the first disk. Output of the third AND gate is connected with inverting input of the first trigger and the first input of the counter. The second input of the counter is connected with "Reset" pushbutton, and output is connected to the first indicator. The instrument also comprises n-decoders, n-third triggers, n-indicators. Output of the counter is connected with the inputs of n-decoders. Outputs of n-decoders are connected with indicator inputs through the first inputs of n-third triggers. The second inputs of n-third triggers are connected with "Reset" Pushbutton.
EFFECT: advanced functionality of optoelectronic instruments for area measurement.
SUBSTANCE: method of a grain-size analysis of lignocarbohydrate materials is based on a direct optical technique of the computer analysis of the plotting in which make measurements of a mass fraction and the square of corpuscles by means of the program of grain-size analysis. For conducting of measurements the corpuscle of comminuted lignocarbohydrate materials is inducted into organic solvent, put in the form of the suspension preliminarily processed by ultrasound, on glass, cover with other glass and put on the cleared surface of the scanner. For a grain-size analysis in addition the extent of destruction of an investigated material is defined.
EFFECT: creation of the method, that allow to obtain more precise information about the corpuscles' form and sizes of lignocarbohydrate materials; to predict properties of products gained during chemical transformations.
FIELD: touch free measurement of dimensions and monitoring article positions with use of fiber optics.
SUBSTANCE: photo-electronic device for measuring linear dimensions and monitoring position of articles includes fiber-optic converter whose inlet ends are arranged in the same straight line one close to other by their wide sides for forming inlet pupil and whose outlet ends are arranged in the form of rectangular matrix for forming outlet pupil; light source mounted in front of fiber-optic converter normally relative to motion of article; digital video camera and computer for processing digital video image.
EFFECT: simplified design, improved response and resolution.
SUBSTANCE: device has radiation source in form of light diode, mounted on one of objects, and multi-element linear photo detector, mounted on another object. Photo detector is made in form of two pairs of multi-element linear photo detectors distanced from each other, light-sensitive lines of which in each pair are mounted at angle α1, relatively to other pair, and between light diode and each pair of linear photo detectors objective and device are mounted, the latter being used for forming light mark image from light diode in form of cross in plane of each pair of linear photo-detectors, made in form of no less than two cylindrical lens bitmaps, not screening each other, angle between symmetry planes of which is α2.
EFFECT: higher precision.
4 cl, 8 dwg