RU2244950C1 - Infrared collimator complex - Google Patents

Infrared collimator complex Download PDF

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RU2244950C1
RU2244950C1 RU2003115592/28A RU2003115592A RU2244950C1 RU 2244950 C1 RU2244950 C1 RU 2244950C1 RU 2003115592/28 A RU2003115592/28 A RU 2003115592/28A RU 2003115592 A RU2003115592 A RU 2003115592A RU 2244950 C1 RU2244950 C1 RU 2244950C1
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Russia
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temperature
output
input
world
background
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RU2003115592/28A
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Russian (ru)
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RU2003115592A (en
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А.Г. Бугаенко (RU)
А.Г. Бугаенко
Е.Ф. Дедюхин (RU)
Е.Ф. Дедюхин
Р.И. Зарипов (RU)
Р.И. Зарипов
В.П. Иванов (RU)
В.П. Иванов
Н.И. Кадыров (RU)
Н.И. Кадыров
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ФГУП "НПО Государственный институт прикладной оптики"
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Abstract

FIELD: optical systems.
SUBSTANCE: IR collimator complex has objective, removable test object disposed at focal plane of objective, background radiator disposed behind removable test object and provided with actuating tool, control unit which has output connected with actuating unit of background radiator, temperature processor which has output connected with input of control unit, test object temperature meter which has output connected with first input of temperature processor, device for measuring temperature difference between background radiator and test object which device has output connected with second input of temperature processor.
EFFECT: improved precision of sustaining contrast radiation level; widened operational capabilities.
5 cl, 2 dwg

Description

The present invention relates to optical instrumentation and is intended to control and measure the parameters of thermal imaging devices (TVP).
Known infrared collimator for monitoring the parameters of optoelectronic devices (US Patent No. 4588253, G 02 B 27/30, 1986), which consists of two planar emitters, one of which is the background, and the other is a test object (world) , devices to maintain the temperature of the background emitter, as well as a mirror lens.
The disadvantage of this infrared collimator is that maintaining the temperature of the background emitter does not ensure maintaining the temperature difference between it and the environment (hereinafter referred to as the temperature difference), which even with a slight change in the ambient temperature leads to a change in the temperature difference, and therefore to a change in the level contrast radiation.
The closest to the alleged invention in technical essence and the achieved effect is an infrared collimator complex for measuring the minimum resolved temperature difference (see Lloyd D. Thermal imaging systems. M. 1978, p. 392, 393).
The infrared collimator complex contains a lens (for example, a mirror), interchangeable with the world, located in the focal plane of the lens in front of a background emitter equipped with an actuator (heater), a control device (maintain the temperature difference), the output of which is connected to the actuator of the background emitter.
A similar infrared collimator complex (as determined by calculation and directly by measurements) with a slight (about ± 1 ° C) change in ambient temperature and a constant value of the temperature difference gives a fairly constant (error of no more than 10%) level of contrast radiation (see Miroshnikov M. M. Theoretical Foundations of Optoelectronic Devices. 1983, p. 227, 228).
Deficiencies in the ideology of such an infrared collimator complex are revealed when checking the TVP in a wide range of ambient temperatures. They are, first of all, depending on the level of contrast radiation, not only on the temperature difference, but also, to a large extent, on the absolute value of the ambient temperature (see M. Miroshnikov Theoretical Foundations of Optoelectronic Devices. 1983, p. 227, 228). For example, when the ambient temperature changes from + 40 ° С to 0 ° С and a constant value of the temperature difference, the level of contrast radiation decreases by more than 2 times.
Significant influence on the ratio of the level of contrast radiation and the temperature difference is also exerted by the parameters (for example, reflection coefficient) of the lens, background emitter and worlds, which, due to significant tolerances, can differ from sample to sample.
These shortcomings lead to the fact that the actual value of the level of contrast radiation will be very different from the set (required), which leads to errors in the measurement of the parameters of the TVP.
To obtain the required value of the level of contrast radiation, the operator, when working with this infrared collimator complex, must, for each determined value of the ambient temperature, set the corresponding value of the temperature difference between the background emitter and the environment, either determined by calculation (due to significant tolerances on the coating materials, the presence of difficult factors, etc. is used, as a rule, only for estimates), or by using data obtained as a result of calibration calibration (calibration) of the infrared collimator complex according to the levels of contrast radiation in the entire working range of ambient temperatures, which is done, for example, by comparing the studied infrared collimator complex and the reference infrared collimator and provides much higher accuracy (see Makarov A.S., Omelaev AI, Filippov VL Introduction to the technique of development and evaluation of scanning thermal imaging systems. Kazan, 1998, p. 201).
The implementation of such actions during the measurement process is difficult and does not allow you to quickly monitor the fluctuation of the ambient temperature, which reduces the accuracy of maintaining the level of contrast radiation. These shortcomings are especially pronounced when determining the minimum resolvable temperature difference (MRRT) of thermal imaging devices, when the level of contrast radiation must be changed rather quickly in time according to a given law. In this case, the current actual level of contrast radiation (which at a high rate of change of the level of contrast radiation may, due to the finite rate of heating of the background emitter, transient processes, etc., should be measured and displayed (displayed on the indicator) differs from the set value, which at operation in the mode of detecting MRI is permissible), which is necessary to determine the level of radiation at which the observer distinguishes using the TVP the strokes set to the working position (in the focal plane of the lens) hydrochloric worlds. The determination of this level is carried out alternately for each of the shiftable worlds. When determining MRI, it is also desirable that the range of the level of contrast radiation includes both positive (emitter temperature above the temperature of the worlds) and negative values (emitter temperature below the temperature of the world) (see Lloyd D. Thermal imaging systems, M., 1978 ., p. 393).
The aim of the proposed invention is to increase the accuracy of maintaining the level of contrast radiation and expanding the functionality of the infrared collimator complex.
This goal is achieved by the fact that in the infrared collimator complex containing a lens interchangeable with the world, located in the focal plane of the lens, a background emitter located behind the interchangeable world and provided with an actuating element, a control device, the output of which is connected to the actuating element of the background emitter, an additional processor temperature, the output of which is connected to the input of the control device, a device for measuring the temperature of the worlds, the output of which is connected to the first input of the processor temperature, a device for measuring the temperature difference between the background emitter and the world, the output of which is connected to the second input of the temperature processor, as well as the fact that the temperature measurement device of the worlds contains the first temperature sensor of the worlds located in the world and is the shoulder of the first bridge circuit, the outputs of which are connected to the inputs of the first differential amplifier, the output of which is the output of the device for measuring the temperature of the worlds, as well as the fact that the device for measuring the temperature difference between the background the teacher and the world contain a temperature sensor for the background radiator located in the background radiator, and a second world temperature sensor located in the world, which are the shoulders of the second bridge circuit, the outputs of which are connected to the inputs of the second differential amplifier, the output of which is the output of the device for measuring the temperature difference between the background emitter and the world, as well as the fact that the temperature processor contains a multi-channel analog-to-digital converter, the first input of which is the first input of the processor temperature, interface device, the input of which is connected to the output of a multi-channel analog-to-digital converter, a computer whose input-output bus is connected to the input-output bus of the interface device, a digital-to-analog converter, the input of which is connected to the output of the interface device, the third differential amplifier, the first input of which connected to the output of the digital-to-analog converter, the second to the second input of the multi-channel analog-to-digital converter and is the second input of the processor to the temperature Foot, and the output of the third differential amplifier is the output temperature of the processor, as well as the actuating element is in the form of an electronic solid-state cooler.
Figure 1 presents a functional diagram of an infrared collimator complex, figure 2 is a functional diagram of a temperature processor.
The infrared collimator complex (Fig. 1) contains a lens 1 interchangeable with the world 2 located in the focal plane of the lens 1, a background emitter 3 located behind the interchangeable world 2 and provided with an actuating element 4, a control device 5, the output of which is connected to the actuating element 4 of the background emitter 3, the temperature processor 6, the output of which is connected to the input of the control device 5, the device 7 for measuring the temperature of the worlds 2, the output of which is connected to the first input of the temperature processor 6, the device 8 for measuring p temperature between the background emitter 3 and the world 2, the output of which is connected to the second input of the temperature processor 6. As an actuator 4 of the background emitter 3, an electronic solid-state cooler can be used, which, depending on the polarity of the voltage supplied to it, can create either positive or and the negative temperature difference between the background emitter 3 and the world 2. Figure 1 also shows the investigated thermal imaging device 9.
The device 7 for measuring the temperature of the worlds 2 (Fig. 1) contains the first sensor 10 for the temperature of the worlds 2 located in the world 2 and is the shoulder of the first bridge circuit 11, the outputs of which are connected to the inputs of the first differential amplifier 12, the output of which is the output of the device 7 for measuring the temperature of the worlds 2.
The device 8 for measuring the temperature difference between the background emitter 3 and the world 2 (Fig. 1) contains a temperature sensor 13 of the background emitter 3 located in the background emitter 3, and a second temperature sensor 14 of the worlds 2 located in world 2, which are the shoulders of the second bridge circuit 15, the outputs of which are connected to the inputs of the second differential amplifier 16, the output of which is the output of the device 8 for measuring the temperature difference between the background emitter 3 and the world 2.
Functional diagram of the processor temperature 6 (figure 2) contains a multi-channel analog-to-digital converter 17, the first input of which is the first input of the processor temperature 6, a coupler 18, the input of which is connected to the output of the multi-channel analog-to-digital converter 17, computer 19, input bus the output of which is connected to the input-output bus of the interface device 18, a digital-to-analog converter 20, the input of which is connected to the output of the interface device 18, the third differential amplifier 21, the first input to connected to the output of the digital-to-analog converter 20, the second to the second input of the multi-channel analog-to-digital converter 17 and is the second input of the temperature processor 6, and the output of the third differential amplifier 21 is the output of the temperature processor 6.
The infrared collimator complex operates as follows.
Areas in the central part of the working surface of the background emitter 3 that are not covered by the interchangeable world 2 (which can be, for example, an opaque plate, in the central part of which there are a number of through slots parallel to each other, the width of which and the interval between them are equal for each of the interchangeable the world has its own size, see view A of Fig. 1), located in the focal plane of the lens 1, create due to a certain heating of the background emitter 3 and the fact that the world 2 has a temperature almost equal to the ambient temperature , a contrast (with a certain level of contrast radiation) infrared radiation stream, which is formed by the lens 1 and in the form of a contrast collimated infrared radiation stream, enters the entrance pupil of the studied thermal imaging device 9. In the thermal imaging device 9, the contrast IR radiation is converted into brightness contrast in the visible region of the spectrum, the value of which is proportional to the level of contrast radiation.
To maintain a given level of contrast radiation when changing the ambient temperature, it is necessary to appropriately change the temperature difference between the background emitter 3 and world 2. The family of dependences of the levels of contrast radiation (within the entire working range of contrast radiation levels) on the ambient temperature in the entire working range of ambient temperatures medium is removed during calibration of the infrared collimator complex.
These dependencies are removed for each of the removable world 2, because each of them has its own optical characteristics (degree of blackness, etc.). The number of recorded characteristics (for each of the interchangeable worlds 2) is selected so that it is possible (using, for example, the linear approximation method) with the required accuracy to determine the value of the temperature difference between the background emitter 3 and world 2, which is necessary to create any (within the operating range ) the level of contrast radiation at any (within the operating range) ambient temperature.
When working in the mode of maintaining a constant level of contrast radiation, it is necessary to determine the ambient temperature, using it, using the dependences obtained during calibration, calculate the required value of the temperature difference between the background emitter 3 and world 2 and ensure that this value is maintained. When the ambient temperature changes, it is necessary each time to re-calculate the required value of the temperature difference between the background emitter 3 and the world 2 and maintain it.
When working in the mode of changing the level of contrast radiation according to a given law, it is necessary to periodically (with a frequency providing the required accuracy of approximation of the law) calculate the level of contrast radiation required at a given time, determine the ambient temperature, then, using the dependences obtained during calibration, calculate the corresponding value temperature differences between the background emitter 3 and the world 2, to ensure its maintenance.
To determine the current actual value of the level of contrast radiation, it is necessary to periodically (with a frequency that provides tracking the level of contrast radiation with the required accuracy) determine the temperature difference between the background emitter 3 and world 2, the ambient temperature, then, using the dependences obtained during calibration, calculate and display current actual value of the level of contrast radiation.
In the infrared collimator complex under consideration, work in the mode of maintaining a constant level of contrast radiation, in the mode of changing the level of contrast radiation according to a given law and determining the current value of the level of contrast radiation are carried out automatically.
Automatically maintaining a constant level of contrast radiation, automatically changing the level of contrast radiation according to a given law, automatically determining the current actual value of the level of contrast radiation increases the accuracy of maintaining the level of contrast radiation (due to the quick and accurate response to a change in ambient temperature), expands the functionality of the infrared collimator complex and is carried out as follows.
The signal from the first temperature sensor 10 of the worlds 2, which is the shoulder of the first bridge circuit 11, is amplified by the first differential amplifier 12 of the device 7 for measuring the temperature of the worlds 2 and in the form of a voltage proportional to the temperature of the worlds 2 and the ambient temperature, because the temperature of the worlds is almost equal to the ambient temperature, is fed to the first input of a multi-channel analog-to-digital converter 17 of the temperature processor 6, and then in the form of a binary code through the interface device 18 it enters the computer 19.
The signal from the second temperature sensor 14 of the worlds 2 and the signal from the temperature sensor 13 of the background emitter 3 (the sensors are the shoulders of the second bridge circuit 15 of the device 8 for measuring the temperature difference between the background emitter 3 and the world 2) are fed to the inputs of the second differential amplifier 16. From its output, the voltage proportional to the temperature difference between the background emitter 3 and the world 2, is fed to the second input of a multi-channel analog-to-digital converter 17 of the temperature processor 6 and then in the form of a binary code through the device 18 pairing enters the computer 19.
First, the calibration data of the infrared collimator complex and the calculation program for the known temperature difference between the background emitter 3 and world 2 and the ambient temperature (temperature of the world 2) of the corresponding levels of contrast radiation, as well as the program for calculating the level of contrast radiation and temperature, are entered into the computer 19 environment corresponding to the value of the temperature difference between the background emitter 3 and the world 2.
When working in the mode of maintaining a constant level of contrast radiation, the operator sets the computer 19 (using its keyboard) the required value of the level of contrast radiation and the number of interchangeable worlds installed in the working position (in the focal plane of the lens 1). Computer 19, using the calibration data stored in it and the corresponding programs, determines and issues a code corresponding to the required value of the contrast radiation level through the interface device 18 to the input of the digital-to-analog converter 20. From the output of the digital-to-analog converter 20, a voltage proportional to the required value of the temperature difference between the background radiator 3 and the world 2 is supplied to the first input of the third differential amplifier 21, the second input of which is supplied from the output of the device 8 for measuring the temperature difference between the background radiator 3 and the world 2, proportional to the actual value of the temperature difference. From the output of the third differential amplifier 21, a voltage proportional to the difference between the required and actual temperature differences between the background emitter 3 and the world 2 is supplied through the control device 5, which can be performed, for example, in the form of a power amplifier, to the actuator 4 of the background emitter 3, what provides negative feedback, and, thus, maintaining the required value of the temperature difference between the background emitter 3 and the world 2.
According to the signals from the device 7 for measuring the temperature of the worlds 2 and the device 8 for measuring the temperature difference between the background radiator 3 and the world 2, coming through the device 18 to the computer 19, it determines the moment of entering the mode of maintaining the temperature difference between the background radiator 3 and the world 2 (mode when the temperature difference does not change for a certain time) and then calculates the actual value of the level of contrast radiation and compares it with the required one (they may differ due to the finite gain t differential amplifier 21, environmental influences such as blowing, etc.). In the event of a deviation exceeding the permissible value, the computer 19 accordingly corrects the code issued by it through the interface device 18 to the input of the digital-analog converter 20, and again, after entering the mode, calculates the deviation of the actual level of contrast radiation from the required one. Depending on the magnitude of the deviation, the computer 19 either gives out (on the display included in it) a ready-to-work signal or repeats the operations of adjusting the code issued by it through the interface device 18 to the input of the digital-to-analog converter 20, until the deviation value will be less than the permissible value.
When operating in the mode of changing the level of contrast radiation according to a given law, the operator sets the computer 19 to the required law of changing the level of contrast radiation and the number of the interchangeable worlds 2 installed in the working position. The computer 19 also comes from the device 7 for measuring the temperature of the worlds 2 (via a multi-channel analog-to-digital converter). 17 and interface device 18) information about the temperature of the worlds 2. Using this data and the corresponding programs embedded in it, computer 19 calculates and outputs periodically through devices о 18 pairing to a digital-to-analog converter 20 is a code corresponding to the temperature difference between the background emitter 3 and the world 2 required at the given moment of time, which ensures a change in the level of contrast radiation according to the required law. Also, at certain time intervals, the computer 19 calculates from the signals from the temperature measuring device 7 the worlds 2 and the device 8 for measuring the temperature difference between the background emitter 3 and the world 2, the current actual value of the contrast radiation level and displays it on the display included in it.

Claims (5)

1. An infrared collimator complex comprising a lens interchangeable to the world located in the focal plane of the lens, a background emitter located behind the replaceable world and provided with an actuating element, a control device whose output is connected to the actuating element of the background radiator, characterized in that it is additionally introduced temperature processor, the output of which is connected to the input of the control device, a device for measuring the temperature of the worlds, the output of which is connected to the first input of the processor Aturny, a device for measuring the temperature difference between a background emitter and the world, the output of which is connected to the second input of the temperature processor.
2. The infrared collimator complex according to claim 1, characterized in that the worlds temperature measuring device comprises the first worlds temperature sensor located in the world and being the shoulder of the first bridge circuit, the outputs of which are connected to the inputs of the first differential amplifier, the output of which is the output of the temperature measuring device worlds.
3. The infrared collimator complex according to claim 2, characterized in that the device for measuring the temperature difference between the background radiator and the world contains a temperature sensor for the background radiator located in the background radiator and a second world temperature sensor located in the world, which are the shoulders of the second bridge circuit the outputs of which are connected to the inputs of the second differential amplifier, the output of which is the output of the device for measuring the temperature difference between the background emitter and the world.
4. The infrared collimator complex according to claim 1, characterized in that the temperature processor contains a multi-channel analog-to-digital converter, the first input of which is the first input of the temperature processor, a coupler whose input is connected to the output of the multi-channel analog-to-digital converter, computer, input bus - the output of which is connected to the input / output bus of the interface device, a digital-to-analog converter, the input of which is connected to the output of the interface device, the third differential device an amplifier whose first input is connected to the output of the digital-to-analog converter, the second to the second input of the multi-channel analog-to-digital converter and is the second input of the temperature processor, and the output of the third differential amplifier is the output of the temperature processor.
5. The infrared collimator complex according to claim 1, characterized in that the actuating element is made in the form of an electronic solid state cooler.
RU2003115592/28A 2003-05-26 2003-05-26 Infrared collimator complex RU2244950C1 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2470335C1 (en) * 2011-04-15 2012-12-20 Открытое акционерное общество "Научно-производственное объединение "Государственный институт прикладной оптики" (ОАО "НПО "ГИПО") Infrared collimator
RU2507494C2 (en) * 2012-04-18 2014-02-20 Открытое акционерное общество Центральный научно-исследовательский институт "ЦИКЛОН" Target for tuning and determination of parameters of optical-electronic systems with matrix photodetecting devices and method of its usage

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
ЛЛОЙД Д., Системы тепловидения, М., 1978. *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2470335C1 (en) * 2011-04-15 2012-12-20 Открытое акционерное общество "Научно-производственное объединение "Государственный институт прикладной оптики" (ОАО "НПО "ГИПО") Infrared collimator
RU2507494C2 (en) * 2012-04-18 2014-02-20 Открытое акционерное общество Центральный научно-исследовательский институт "ЦИКЛОН" Target for tuning and determination of parameters of optical-electronic systems with matrix photodetecting devices and method of its usage

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