Device for the continuous control of parameters of the hexagonal fiber optic rod during the drawing

 

(57) Abstract:

The invention relates to measuring equipment. The purpose of the invention is the extension of the functionality of the device, which is to offer the possibility of determining the angle of torsion of the controlled rod while improving performance by eliminating optical-mechanical scanning of the light beam and replace it optoelectronic scanning. The device includes a laser 1, a collimator 2, a beam splitter 3, forming two measuring channels, the first of which is designed to analyze the distribution of illumination in the plane of analysis and calculation of the size of the shadow projection from hex rod 5 and contains frosted diffuser 4, the lens 6, the coordinate-sensitive photodetector 7, and the processing unit, consisting of device 8 video processing, computing device 9 and the Registrar's size 10 hex rod. The second channel is provided for determining the angle of twist hexagonal fiber optic rod changes the diffraction-interference pattern occurring during the rotation of the rod around its axis. It consistently are polarized with the, who and which secured the two duplomatic of a sensor connected with the second block of information consisting of a comparator, counter interference fringes, the second computing device and the Registrar of the angle of torsion of the hex rod. The second computing device connected to the first to transmit information on the introduction of amendments in the calculation of the size of the hex rod, considering the angle of torsion during extrusion. All opto-electronic elements mounted on a single platform with a hole for the passage of the controlled rod 5 mounted for rotation around a geometric axis of the rod 5. 6 Il.

The invention relates to measuring technique and can be used for contactless control of the size and angle of twist hexagonal fiber optic rod in its manufacture in the cold area of the hood.

It is known device [1] for contactless control of the size of the hex rod containing the illuminator, the scanner unit made in the form of two synchronously rotating special prisms, lens, special oscillating diaphragm associated with the drive rotation of the prisms, and photovoltaic priceonline values of the projections of the hexagon, and choosing of these electrical signals is minimal, corresponding to the size of the controlled hex. The size of the hex rod is made the value of the diameter of a circle inscribed in the hexagon formed by the hexagonal cross section of the rod plane perpendicular to the geometric axis.

The disadvantages of the known device is the complexity of design and difficulty of synchronizing the rotation of the prisms and oscillatory movements of the diaphragm.

The closest in technical essence of the present invention is a device [2] for continuous monitoring of the size of the hex rod in its manufacture containing the illuminator, the collimator, the scanner unit made in the form of two mirrors arranged at an angle of 45aboutto each other and forming a dihedral angle, the lens and the photoelectric Converter, coupled to the processing unit.

The disadvantages of this device is the need for optical-mechanical scanning of the controlled hex beam of rays in the search for the minimum size of the shadow pattern, which reduces the operating speed of the device, and the inability to determine the angle of the measurement error of the size of the hex rod in the manufacturing process.

The invention allows to extend the functionality of the device, which is to offer the possibility of determining the angle of torsion of the controlled socket while increasing the speed of operation of the device by eliminating optical-mechanical scanning of the light beam and replace it optoelectronic scanning.

The technical result is achieved by the fact that as the illuminator is used, the laser having passed through the collimator installed a beam splitter, which divides the laser beam into two parallel laser beam, the axes of which are located in the plane passing through the axis of the hexagonal rod, and forming two measuring channels, the first of which between the beam splitter and the controlled object is the diffuser radiation. Photoelectric Converter is implemented in the form of coordinate-sensitive photodetector, connected to the processing unit, consisting of series-connected devices, video processing, computing devices and indicator of the size of the rod. The second measuring channel contains consistently located after the controlled object polarizationoptics axis of the second lens two identical slotted aperture, for which secured two duplomatic of a sensor connected with the second processing unit consisting of series-connected comparator, counter interference fringes, the second computing device and the indicator of the angle of torsion of the rod. The second computing device connected with the first.

In Fig. 1 and 2 presents the scheme of the two-channel measuring device of Fig. 3 - the distribution of light shadow pattern in the plane of analysis, Fig.4 - plot of the video signal taken with the photodetection device of the first channel; Fig.5 - the distribution of light in a diffraction pattern in the plane of analysis, Fig.6 is a plot of the photoelectric signal produced by the photodetector of the second channel by tightening the hex rod.

The device includes a laser 1, a collimator 2, a beam splitter 3, forming two measuring channels, the first of which is frosted diffuser 4, the radiation axis of which is directed to the rod 5 lens 6, the coordinate-sensitive photodetector 7, and the processing unit, consisting of a device of the video processing 8, the computing device 9 and the Registrar 10 size h is Activ 12, in the rear focal plane of which has two identical slotted aperture 13 and 13', which has two duplomatic of the photodetector 14 and 14' connected with the second processing unit, consisting of a comparator 15, a counter 16 interference fringes, the second computing device 17 and 18 Registrar of the angle of torsion of the hex rod 5. The second computing device 17 is connected with the first computing device 9. All opto-electronic components of the device are mounted on a single platform with a hole for easy passage of the controlled hex rod 5, as well as the possibility of rotation around the geometric axis of the hexagonal rod 5.

The device is located in a cold zone of the extrusion hex fiber optic rod and works as follows.

The parallel laser beam 1 generated by the collimator 2, falls on a beam splitter 3, (a system of two mirrors and so on), which divides the laser beam into two. The first beam hits the diffuser 4 (for example, matte vinyl, which violates the coherence of the laser beam and lights controlled hex rod 5. Lens 6 fo what dmeta research the rod 5. In the plane of analysis of the PA is coordinate-sensitive photodetector 7 (for example, PES-line), which scans the shadow picture and converts the light distribution in the 1 (x) in the video signal V(t) sent to the device, video processing 8, whence it enters the computing device 9 having two inputs. Computing device 9 calculates the size of the shadow pattern S', but as it is introduced in advance of the linear magnification of the fifth lens 6, the output of the computing device 9 is formed by a coded signal on the size S of the shadow projection of the hexagonal rod 5 which is filed with the Registrar of 10 (for example, a digital voltmeter, display, etc).

During the drawing for the hex fiber optic rod characteristic transverse offset by approximately 1-1,5 S and twisting around its geometric axis. Transverse offset hex rod lead to the displacement of the shadow pattern in the plane of analysis of the PA, however, by proper choice of the increase of the V lens 6 and the size of the photosensitive area of the coordinate-sensitive photodetector 7 (equal to 3S', where S' = VS) the effect of transverse offset hex rod on the correctness of servoy paintings, what affects the accuracy of measuring the size of the hex rod, as

S' = SVK () where () is the distortion factor of size S at the expense of the twisting angle . The coefficient K( ) distortions of size S for stud hexagon shape is determined by the formula:

K() = + cos

Before starting the measurement by rotating the platform around the geometric axis of the hexagonal rod 5 achieve the minimum size of S' shadow pattern from hex rod 5, which corresponds to the increased size of the hex rod 5 without regard to its twist.

To determine the angle of twist hexagonal fiber optic rod 5 in the device has a second measuring channel, consisting of a series set the polarizing filter 11, a lens 12, in the rear focal plane symmetrically with respect to the optical axis of the second channel are two identical in size slotted aperture 13 and 13', and they have two duplomatic of the photodetector 14 and 14' connected with the second signal processing unit.

When hit by the laser radiation on the surface of the controlled hex rod 5 is scan the laser beam in the plane is recommendee optical fibers, components of the hex rod 5 with the transverse light interfere among themselves, forming an interference pattern modulated by the diffraction of laser radiation at the edges of the hexagonal rod 5. When spontaneous twisting of the rod 5 during drawing is a redistribution of energy in the diffraction-interference pattern due to the change of the angles of incidence of the laser beams on the verge of a rod 5, which leads to running interference pattern and the change in angular coordinates of the diffraction maxima and minima by changing the size of the diffraction screen (projection of the cross-section of the rod 5). At the same time will change the size of S' shadow patterns analyzed in the first measurement channel.

Interferention-diffraction pattern observed in the sweep of the laser beam in the plane due to the presence of inhomogeneities of the faces of the rod 5 (caused by uneven stacking and flattening some of the optical fibers constituting the web), has significant uneven distribution of light and nonlinearity its changes during the tightening rod 5 around its geometric axis.

Posted ex is Solorina in the far zone, Fraunhofer where there is a clear diffraction pattern with a fixed zero and maximum symmetric diffraction peaks up to 20-40 left and right of it. When tightening the rod at an angle due to interference of light occurs alternately attenuation of the diffraction maxima on the principle of a traveling wave (Fig.5). At the same time, due to changes in the size of the diffraction screen (shadow projection of the rod 5), a shift of the diffraction maxima in the direction towards zero maximum (zoomed in shadow projection), and Vice versa - from zero to a maximum (when the reduction of the shadow projection).

Therefore, to control the running of the interference bands characterizing the angular tightening the hex rod 5, a sufficient condition is the location of the photodetectors in the area of diffraction. To determine the direction of twist of the controlled hex rod 5, the photodetector enough to perform, for example, duplomatic. This will help by comparing the electrical signals taken from both sites of the photodetector to determine the sign of the torsion rod, simultaneously calculating the number of running interference fringes proportional to the value of coal is ve used two duplomatic of the photodetector 14 and 14', arranged symmetrically about the optical axis of the second measuring channel and registering the same position of the diffraction maxima to the left and to the right from zero to a maximum diffraction pattern. The interference fringe when tightening the rod run in one direction in the entire sweep of the laser beam, and the diffraction peaks of the picture Fraunhofer shifted symmetrically zero to a maximum, so when comparing signals from photodetectors 14 and 14' in the comparator 15, eliminating the error in counting the number of interference fringes due to the diffraction on the hexagonal cross section of the rod 5. The light sensitive area of the photodetector 14 and 14' are limited to exposure light beam diaphragms 13 and 13' that are installed directly in front of them and having the same width b equal to the distance between two adjacent minima of the diffraction pattern.

To increase the contrast of the analyzed diffraction pattern and the effects of spectra of laser radiation in front of the lens 12 has a polarization filter 11 with the possibility of adjustment by rotating around the optical axis of the second measuring channel. As a result of mileage interp is l, close to a sinusoid. The number of bands is determined by the count of the interference bands 16 and carries information about the angle of twist . The signal in digital form is fed from the counter 16 in the computing device 17, where the pre-entered data on the radiation wavelength and the nominal size of SMr.controlled rod 5, which is determined by the angle of twist . Information from the computing device 17 is supplied to the indicator 18 (for example, digital display with timer), locking the angle of twist for a certain period of time. This allows you to measure the angle with the exhaust velocity hex rod 5 and to adjust the length of the rod when it is further cutting or troubleshoot in the processing chain at an unacceptably high value . In block 17 also calculates the K factor( ), which is sent in digital form in a computer device 9 of the first measuring channel, where you enter in the form of an amendment when calculating the real size S of the controlled terminal 5 according to the formula:

S = . Thus, there is an additional control one of the most important parameters of the hexagonal fiber optic rod is the angle of twist, which is technical deistvie measurements of the size of the hex rod due to the replacement of the optical-mechanical scanning of the light beam on optoelectronic adjusted for the angle of torsion of the rod.

Experimental studies on the control of hexagonal fiber optic rods ranging in size from 350 to 750 microns during extraction when used as a coordinate-sensitive sensor CCD type 1200 CL and a linear increase in V = =15xshowed that the standard error of measurement of the size of the hex rod was 2-5 μm, and the angle of torsion of the rod 0,1aboutin the range of 360about.

DEVICE for the CONTINUOUS control of PARAMETERS of the HEXAGONAL FIBER OPTIC ROD DURING the DRAWING containing successively installed illuminator and a collimator lens, a photoelectric Converter, a processing unit, and calculating the size of the hex rod connected therewith, characterized in that it further comprises a beam splitter mounted behind a collimator in the course of the radiation flux and designed to divide the flow of radiation into two parallel light beams, two measuring channels, the first of which is made in the form prescribed in the course of the first light beam diffuser light, designed for positioning in front of the object, and PV the transformation of the information, consisting of series-connected devices, video processing, connected to the photoelectric Converter, computing devices and indicator of the size of the rod, the second measuring channel includes successively installed along a second light beam in the past the light flux of the polarizing filter, the second lens, two identical slotted aperture placed in the rear focal plane of the lens is symmetrical to its optical axis, and two duplomatic of a sensor installed in front of the respective diaphragms, and a second processing unit, made in the form of series-connected comparator connected to duplomatic the photodetectors, counter interference fringes, the second computing device and the indicator of the angle of torsion of the rod, the second computing device connected to a second input of the first computing device, the illuminator is made in the form of a laser.

 

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