Collimator for tuning multichannel television system

FIELD: physics.

SUBSTANCE: collimator has a housing inside of which there is a light source, a scattering element, a test object, a lens and a light-splitting unit, all lying on one optical axis. The light source is made from discrete elementary emitters. The emitting surfaces of the emitters are made diffusion-scattering. The distance between the emitting surfaces of the emitters and the test object is defined by the expression where l is the distance between the surface of the emitter and the plane of the test object, I is the luminous intensity of the elementary radiation source, E is the illuminance of the light background in the plane of the test object and a is a uniformity coefficient. The lens is designed for a narrow spectral range. The light-splitting unit is configured to split the image of the test object constructed by the lens into two geometrically and energy identical images. The light source, lens, light-splitting unit and photodetectors of the television system are optically interfaced with each other at radiation wavelength which corresponds to viewing wavelength.

EFFECT: design of a collimator which is reliable during operation, is easy to manufacture, assemble and tune.

3 cl, 5 dwg

 

The invention relates to the optical instrument and can be used during alignment and configuration of the television cameras, multi-channel television system.

It is known device [1] on the basis of the collimator containing a slit aperture installed in the focal plane of the collimator lens, which is illuminated by an incandescent light bulb through the condenser lenses and filters, a projection lens and a CCD line.

The disadvantage of this device is the presence of a projection lens and a slit diaphragm, high-quality image which requires additional mathematical processing.

It is known device [2] on the basis of the collimator, including located on the same optical axis of the light source, dashed to the world with a given spatial frequency, equipped with a mechanism for moving perpendicular to the optical axis of the collimator lens, TV camera CCD for processing measurement data, to provide uniform illumination dashed worlds between the light source and the dashed Mira is milk glass, and to select a specific spectral range between milk glass and dashed Mira installed the filter.

The disadvantages of this device include optical misalignment of the collimator lens and the light source, not bodymist use of the filter, the polychromatic light source, a mechanism for moving the bar worlds.

Listed a set of drawbacks leads to low operating and optical parameters, reduces the reliability of the device due to the complexity of design and manufacturing technology nodes and their mutual alignment.

The fact that an incandescent lamp as a light source emits a wide band of wavelengths. This means that to obtain high-quality images dashed worlds need a lens collimator, which ensured the correction of chromatic aberrations. This requirement complicates the calculation, design and manufacture of the lens. Optical aligning the emission spectrum taken through the use of filters, which complicates the design and manufacturing technology of the device. In addition, the use of incandescent lamps is not economical due to the fact that small conversion of electrical power into light, and the input electric power of the lamp is very significant. The application of the mechanism for moving the bar worlds necessitates the use of high-precision, and therefore expensive manufacturing techniques separate parts and leads to significant errors in the measurements on the second information channel.

The task of the invention is to provide a reliable in operation, simple in manufacture, Assembly and adjustment of the collimator, allowing you to work simultaneously with two cameras television system containing a lens, characterized by small size, simplicity of design and manufacture, providing in conjunction with the light source to the desired image quality; reliable and efficient light source, optically associated with the lens to provide the desired image quality, creating a uniform illumination of the test object, providing the necessary power radiation time and constant radiation power when the temperature changes, the test object, the scattering element and the beam splitting unit, with the items listed located in the housing of the collimator on one optical axis and the light source, the lens and the photodetector TV camera optically aligned with each other and the observer, and the selected wavelength of visible range allows you to assess the quality of Assembly of the collimator and conduct a visual configuration of the optical system.

The technical result is achieved in that in the housing of the collimator to the optical axis are the charge of the light source, the scattering element, the test object, the lens and the beam splitting unit, while on jectiv minimized dimensions, optimized structural simplicity, technological implementation and provides imaging the test object at infinity with the required image quality; the light source is a matrix of series-connected in the electrical circuit of LEDs emitting in the visible range of wave lengths; the beam splitting unit configured to split image of the test object, built lens, two geometrically and energetically identical images that allows you to work simultaneously with two cameras television system, the sighting axes are parallel to each other; however, the test-object and the scattering element components with predetermined parameters.

Structural simplicity lens suggests the possibility of obtaining a poor image due to the complex monochromatic and chromatic aberrations. Limitation of working spectral range of the lens allowed us to minimize the effect of chromatic aberration (chromatism, spherochromatism), which helped to provide the required image quality. Therefore, the lens is made to work in a narrow spectral range.

Unlike the prototype required spectral range is not using a color filter, and generates the I choice of the light source, providing the optical relationship of the light source and the lens.

The light source creates a uniform illuminance in the plane of the test object due to the fact that discrete elementary emitters are located so that the geometry of their arrangement is similar to the geometry of the test object.

In addition, the light source is equipped with discrete elementary emitters with pre-treated by grinding (for larger scattering) surface radiation. This additional scattering in conjunction with the scattering element greatly increases the uniformity of illumination in the plane of the test object, which allows you to refuse the use of condenser optical system.

Of particular importance is the optical alignment between the observer, the light source, the lens and the photodetector TV camera. The fact that the choice of the same operating wavelength radiation, for example λ=0,85 μm, for light source, the lens and the photodetector TV camera is a necessary condition for system operation, but it is quite insufficient for inclusion in the configuration process of the observer. Therefore, the working wavelength selected to carry out the visual setting of the collimator.

The required level of illumination in the plane of the test object, regardless of the time provided by exhibiting powerful the particular radiation of the light source on the level providing significant excess of the minimum threshold of illumination of the test object.

Consistency emitted by the light source power when the temperature is achieved by introduction of an electric circuit the resistance value of which changes depending on temperature. Putting a certain value of the current in the electric supply circuit when certain values thermocapillary and temperature, will receive the same value of current in circuit with temperature fluctuations from the set value.

Evenness of illumination of the test object is also achieved by the inclusion of discrete elementary radiators in series circuit. Through each emitter flows the same current that causes the same radiated power of each elementary radiator.

Elementary emitters that make up the light source, are from the test object with the scattering element at a distance, which is determined by the expression:

where l is the distance between the surface of the discrete elementary emitters and the plane of the test object; I - force of light elementary discrete emitter; E - illumination light background in the plane of the test object; a is the coefficient of uniformity, depending on the geometrical and optical parameters of the individual on srednego elementary emitter and its quantity in the electric circuit, the geometry of their arrangement on the Board.

where ST-T- square test table, SAI- the area of the circuit Board of the light source.

where k is the coefficient of the discrete elementary emitters Board with an area of SAI(can take values in the range of 0.3-1);

UP- voltage electric circuits;

UWith- voltage discrete elementary emitter;

- the number of discrete elementary emitters on the Board of the light source;

SWith- the area of a radiating surface of discrete elementary emitter.

The lens of the collimator optically conjugate with the beam-splitting unit. A certain position of the beam-splitting unit relative to the lens, as shown by theoretical basis of computer simulation and practical research, allow you to get both in the first and especially the second television channel flows of light of sufficient power and of equal size. This is especially important if television cameras vary the input optical parameters.

The claimed set of distinctive features aimed at obtaining the claimed technical result.

Appl the config collimator shown in figure 1. The collimator includes a housing 1, a lens 2 in the casing 3, the test object 4, the scattering element 5, cost 6 discrete elementary emitters 7, the beam splitting unit 8, the holder 9.

Declared collimator operates as follows. When switching on the electric circuit elementary discrete emitters of the light scattering element, and through him to the test object, which image the lens directs the beam splitting unit. In the beam splitting unit, the flow is divided into two equal parts, each of which falls within the corresponding lens of each of the TV cameras.

A pilot test was collimator following specific performance. In the case of material D16T posted by fee with 12 LEDs, which are arranged in 4 rows of 3 LEDs each (figure 2). They are in the rectangle with dimensions of 24×32 mm2. The surface of the lenses of the LEDs so removed to a depth of 1.5 mm from the top of the original sphere. The LEDs included in a series circuit with a supply voltage of 27 V and "quenching" resistance of 150 Ohms, role thermocapillary. Led type CIPD IN-Q4 produced by JSC "proton". The wavelength λ=0.63 µm.

At given values of I=14 KD, E=1000 Lux, k=0.3, the value of coefficient a=0,24 and the distance between the test object and the surface of the discrete elementary emitters l≈30 mm to the specific implementation of the distance l was reduced due to the presence of the scattering element. Thus, at a distance of 25 mm from the medium grinded surfaces of the LEDs placed milk glass (scattering element) and at a distance of 1 mm from it is universal television test table TITUS 0249 size figure 24×32 mm2(the dimensions of the test chart corresponds to the generated geometry location and size of the led arrangement). In the front focal plane of the lens is the test table (figure 3). The lens has the following parameters: f'=100 mm, D/f'=1:2,5. Small size and simple design of the lens is achieved by using the lens only two spherical lenses. The presence of the two lenses of the total radius entails ease of manufacture and Assembly, and the execution in the form of a glued block - easy centrifuge in the rims of the lens.

The lens is adjacent prismatic block (figure 4), made in the form of a prism, which is based on the beam splitting cube and prism AR-90. It is necessary to highlight the different dimensions of the composite prism: svetodalnomery cube has smaller dimensions than the prism AR-90. This is done for convenience of mounting the composite prism in the design of the holder, since in this case there is no unwanted load on the spot gluing of the cube.

The optical scheme of the collimator shown in figure 5.

According to the results of the experimental tests collimator accepted for serial production is the tion.

Sources of information

1. Basanov VI CP Central design Bureau "Arsenal" is a leading developer of optical and opto-electronic devices and systems in Ukraine. Sat. MAC Kontenant" - 2002, October, p.6-10.

2. Patent RU 2282170, G01M 11/02 - prototype.

1. The collimator to configure multi-channel television system, comprising a housing located therein on one optical axis of the light source, the scattering element, the test object, the lens and the beam splitting unit, wherein the light source is made of discrete elementary emitters, the size and geometry which is similar to the size and geometry of the test object, and the emitting surface of the emitter is made of a diffuse-scattering, and the distance between the radiating surfaces of the transducers and the test object is determined by the expression
,
where l is the distance between the surface of the emitters and the plane of the test object;
I - force of light elementary radiation source;
E - the illumination light background in the plane of the test object;
a is the coefficient of uniformity,
the lens is minimized in size, optimized for constructive simplicity and technological implementation, made for a narrow spectral range, the beam splitting unit configured to split image of the test object, built lens filter diameter is, two geometrically and energetically the same image, with the light source, the lens, the beam splitting unit, photodetectors television system optically aligned between a wavelength of the radiation corresponding to the wavelength of observation.

2. The collimator to configure multi-channel television system according to claim 1, characterized in that the discrete elementary emitters are connected in serial electrical circuit.

3. The collimator to configure multi-channel television system according to claim 2, characterized in that the electrical circuit is enabled resistance.



 

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