Ir collimator set

FIELD: optics.

SUBSTANCE: IR collimator set has objective, removable test object disposed in focal plane of objective and provided with actuating member, control unit which has output connected with actuating member of background radiator, temperature processor which has output connected with input of control unit, unit for measuring temperature of test object which has output connected with first input of temperature processor, device for measuring temperature difference between background radiator and test object, which has output connected with second input of temperature processor. Environment temperature measuring unit is introduced into device additionally, which unit has output connected to third input of temperature processor. Temperature processor controls value of power voltage of background radiator's actuating member by means of control unit in such a manner than factual value of temperature difference between background radiator and test object coincide with current resulting required value, defined depending on required level of contrast radiation, current temperature of test object and current value of environment temperature to give precision which provides sustain of required level of contrast radiation with admissible error.

EFFECT: improved precision of sustain of contrast radiation level.

1 dwg

 

The present invention relates to an optical instrument and is intended for control and measurement of thermal imaging devices (NT).

Known infrared collimator complex (see Lloyd D. System imaging. M., 1978, str, 393), containing the lens, changeable world, placed in the focal plane of the lens in front of the background emitter supplied with actuating element (heater), device management (maintain temperature difference), the output of which is connected to the Executive element background of the emitter.

The disadvantage of this infrared measuring system is that the maintenance of the temperature difference between the background emitter and Mira do not maintain the level of contrast radiation when working in a wide range of ambient temperatures, since the level of contrast of the radiation depends not only on the temperature difference between the background emitter and Mira, but also to a large extent on the absolute values of the worlds temperature (ambient temperature).

Closest to the proposed invention to the technical essence and the achieved effect is an infrared collimator complex (Patent RF №2244950, G02 27/30, published, 20.01.2005)containing the lens, changeable world, located in the focal plane of the lens is willow, background emitter located at Mira and is equipped with an actuating element, a control device, the output of which is connected to the Executive element background of the radiator, CPU temperature, the output of which is connected to the input of the control device temperature measurement worlds, the output of which is connected to the first input of the processor temperature, the device measuring the temperature difference between the background emitter and Mira, the output of which is connected to the second input of the processor temperature.

Such an infrared collimator complex when the temperature of worlds automatically changes the temperature difference between the background emitter and Mira by law, obtained during calibration of the infrared measuring system within the operating range of ambient temperatures and high accuracy maintain the level of contrast of the radiation at any (within the operating range) the value at ambient temperature.

The lack of ideology is similar to the infrared collimator complex manifests itself in his work for a long time, when there is a gradual heating (cooling) worlds at the expense of the transfer of heat (cold) from next to her at a short distance background of the radiator and there is a temperature difference between the Mira and the environment. (At the beginning of the operation the temperature of the worlds and the environment are almost the same).

At the same temperature values background emitter and worlds, but different values of the ambient temperature level of contrast of the radiation output of the infrared reflector of the complex will be different.

This is because the degree of blackness of the background surface of the emitter and the worlds in practice is always less than 1 (usually located within 0,94 0,92...), and the flow of infrared radiation, each of them will be determined not only by temperature but also the temperature of the surfaces, the flow of infrared radiation which is reflected from, respectively, of the background of the emitter and the worlds.

The world reflects (in part, in accordance with the degree of blackness of the surface) of the incident fluxes of radiation from the structural elements of the collimator (mainly from the housing of the collimator)with ambient temperature. Therefore, the radiation flux from the worlds when the ambient temperature is below the temperature of worlds, will be less than when the ambient temperature and the temperature of the worlds are the same.

The flow of infrared radiation from the background of the emitter at different ambient temperatures, but the same temperature of worlds would be essentially the same as background emitter more information is camping at a small distance directly behind Mira and almost completely closes it. Therefore, it reflects (in part, in accordance with the degree of his black surface) the flux of infrared radiation worlds (back side), which at the same temperatures worlds will be almost the same.

Thus, at equal temperatures worlds and background of the radiator, but different ambient temperatures, the level of contrast of the radiation output of the infrared reflector of the complex, determined by the difference between the infrared fluxes background radiation emitter and the worlds will be different, i.e. the error of maintaining the level of contrast of the radiation. While the magnitude of the error depends not only on the temperature difference between the worlds and the environment, but also on the absolute values of these temperatures (Error is greater for large absolute values of the temperatures).

Thus, when the ambient temperature is 300 K and the temperature difference between the worlds and environmental 0.4 To change the level of contrast of the radiation in comparison with the case where this difference is equal to 0 It will be on the order of (0,02 0,04...) To that for an infrared collimator systems with admissible error, usually no more than ±0,01 To unacceptable.

To ensure the required accuracy of the measurement and maintenance of the level of contrast of the radiation it is necessary to perform correction of infrared collimator complex difference t is Imperator worlds and the environment taking into account the absolute values of the ambient temperature.

The aim of the invention is to improve the accuracy of maintaining the level of contrast of the radiation.

This goal is achieved by the fact that in the infrared collimator complex containing the lens, changeable world, located in the focal plane of the lens, the background emitter located at Mira and is equipped with an actuating element, a control device, the output of which is connected to the Executive element background of the radiator, CPU temperature, the output of which is connected to the input of the control device temperature measurement worlds, the output of which is connected to the first input of the processor temperature, the device measuring the temperature difference between the background emitter and Mira, the output of which is connected to the second input of the processor temperature, added a device to measure the ambient temperature, the output of which connected to the third input of the processor temperature, and the processor temperature and the control device is designed in such a way that the CPU temperature using the control device regulates the voltage of the power element background of the radiator so that the actual value of the temperature difference between the background emitter and Mira coincides with the current result required value is eat, specific depending on the desired level of contrast radiation, the current temperature of worlds and the current ambient temperature, with precision, providing the required level of contrast radiation with acceptable error.

The drawing shows a functional diagram of an infrared collimator complex.

Infrared collimator complex includes a lens 1, a changeable world 2, located in the focal plane of the lens 1, the background emitter 3, located behind the removable Mira 2 and provided with actuating element 4, the control device 5, the output of which is connected to the Executive item 4 background of the radiator 3, the processor temperature 6, the output of which is connected to the input device 5, the control device 7 temperature measurement worlds 2, the output of which is connected to the first input of the processor temperature of 6, unit 8 of measuring the temperature difference between the background emitter 3 and Mira 2, the output of which is connected to the second input of the processor temperature 6 the device 9 measuring the ambient temperature, the output of which is connected to the third input of the processor temperature 6. The drawing also shows the analyzed thermal imaging device 10.

Works infrared collimator complex as follows.

Areas in the Central part of the work is her background surface of the radiator 3, not closed replaceable Mira 2 (which can be, for example, an opaque plate in the Central part of which there are a number of parallel through-slits whose width and spacing between them equal to each of the changeable world have their value, see view a)located in the focal plane of lens 1, create at the expense of a certain background heating radiator 3 and that of the world 2 has a temperature different from the background temperature of the radiator 3, contrast (with a certain level of contrast radiation) flux of infrared radiation, which is formed by the lens 1 and contrasting collimated flux of infrared radiation enters the entrance pupil of the investigated thermal imaging device 10. In the infrared imaging device 10 contrast infrared radiation is converted to luminance contrast in the visible region of the spectrum, the magnitude of which is proportional to the level of contrast of the radiation.

For output to the desired level of contrast radiation and maintain the CPU temperature 6 according to the signal received at its first input device 7 temperature measurement worlds 2, periodically determines the current temperature value worlds 2 (it is within a certain (short) time after switching on the infrared collimator complex with sufficient precision the Yu coincides with the ambient temperature). Given by the operator (using the keyboard processor temperature 6) the desired level of contrast of the radiation and the measured current temperature value worlds 2 processor temperature 6 using pre-installed in it according to the level of contrast of the radiation from the temperature difference between the background emitter 3 and Mira 2 and the temperature of the worlds 2 obtained when calibrating an infrared collimator complex, periodically calculates the appropriate initial current to the desired value of the temperature difference between the background emitter 3 and Mira 2. But, since the calibration is carried out in mode, when the temperature of the worlds 2 is almost equal to the ambient temperature (i.e. without long exposure in each dimension), maintaining the temperature difference between the background emitter 3 and Mira 2 level equal to the current initial AYP, will maintain the desired level of contrast radiation only in case of equality of temperatures worlds 2 and the environment.

To maintain the desired level of contrast radiation with long-term needs in the process to periodically adjust the value of the temperature difference between the background emitter 3 and Mira 2. This is done as follows.

CPU temperature 6 by a signal at its third input is the unit 9 measuring the ambient temperature determines the current ambient temperature and calculates the current temperature difference between the worlds 2 and the environment. Then, by pre-processor temperature 6 based corrective offset temperature difference between the background emitter 3 and Mira 2 (offset, providing compensation for the effects of temperature differences worlds 2 and the environment) from the value of the temperature difference between the worlds 2 and the environment and of the absolute value of the ambient temperature, processor temperature 6 periodically calculates the current value necessary corrective offset corresponding to the current temperature difference between the worlds 2 and the environment when the current value of the ambient temperature. (The dependence of the corrective offset from the temperature difference between the worlds 2 and the environment and of the absolute value of the ambient temperature is determined by calculation or empirically, separately for each of the changeable world, because the optical characteristics of the interchangeable world (for example, the degree of blackness) may be different. The right choice is made by the processor based temperature 6 automatically according to the number prescribed in the operating position (by the operator) changeable worlds.

Next, the CPU temperature 6 calculates the current resulting desired value of the temperature difference between the background emitter 3 and Mira 2 as the sum of the current initial desired value of the temperature difference is between the background emitter 3 and Mira 2 and the current adjustment of the offset.

This is the current result to the desired value, the CPU 6 compares the temperature with the actual temperature differential between the background emitter 3 and Mira 2, which he defines on the signal received at its second input device 8 measuring the temperature difference between the background emitter 3 and Mira 2.

The processor 6 regulates temperature through the device 5 controls the voltage of the power supply element 4 background emitter 3 so that the current resulting desired and actual values of the temperature difference between the background emitter 3 and Mira 2 are identical, providing the level of contrast of the radiation output infrared collimator complex with an error not exceeding the allowable value regardless of the length of time of operation of the complex.

Infrared collimator complex containing the lens, changeable world, located in the focal plane of the lens, the background emitter located at Mira and is equipped with an actuating element, a control device, the output of which is connected to the Executive element background of the radiator, CPU temperature, the output of which is connected to the input of the control device temperature measurement worlds, the output of which is connected to a first of the at the input of the processor temperature, the device measuring the temperature difference between the background emitter and Mira, the output of which is connected to the second input of the processor temperature, characterized in that it additionally introduced a device to measure the ambient temperature, the output of which is connected to the third input of the processor temperature, and the processor temperature and the control device is designed in such a way that the CPU temperature using the control device regulates the voltage of the power element background of the radiator so that the actual value of the temperature difference between the background emitter and Mira coincide with the current result required value determined depending on the desired level of contrast radiation, the current temperature and worlds the current ambient temperature, with precision, providing the required level of contrast radiation with acceptable error.



 

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