A detection system and method for detecting the MRTD performance of an infrared detector

Abstract

The present application relates to a kind of detection system of infrared detector MRTD performance, including target frame, wind baffle is equipped in target frame frame, wind baffle is laid with the infrared thermal film for detecting the MRTD performance of infrared detector;The side of target frame is equipped with the relay for controlling infrared thermal film to be connected or disconnected, relay is electrically connected with multiple infrared thermal film respectively by wire, relay side is connected with the temperature difference controller for adjusting the surface temperature of infrared thermal film by wire, temperature difference controller is installed with remote control receiver, remote control receiver is wirelessly connected with remote controller;Infrared detector is placed in the far side opposite target frame, and its can detect the imaging effect of different numbers of infrared thermal film transformation;Remote controller is located in infrared detector side, for remote control infrared thermal film to present the imaging pattern of different numbers.By the method, the performance of infrared detector can be detected in field test environment, can not be influenced by subjective factor, can objectively distinguish the MRTD performance of infrared detector.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of infrared detector detection, and particularly relates to a detection system for MRTD performance of an infrared detector and a detection method thereof. BACKGROUND

[0002] With the vigorous development of infrared detector technology, infrared imaging technology has been widely used in military and civilian fields, such as airport security, infrared night vision, etc. Among the performance parameters of the infrared thermal imaging system, the minimum resolvable temperature difference (English abbreviation MRTD) not only reflects the thermal sensitivity characteristics of the system, but also reflects the spatial resolution of the system. It can be tested by both the manufacturer of the thermal imager and the user of the thermal imager, and therefore becomes the most important parameter for evaluating the performance of the infrared imaging system. At present, the test methods for testing the MRTD performance of the infrared detector in the prior art mainly include the following:

[0003] (1) Infrared simulator target test method. The specific test method is as follows: in a laboratory environment, an infrared simulator is designed according to the parallel tube imaging principle, which is placed in front of the tested infrared detector at a distance of 1 meter. The infrared simulator target is powered on, the temperature difference is adjusted, and different thick and thin stripes or cross patterns will appear in the infrared simulator according to the patch target plate, and then the detector is used for identification. The test of this method is completed in the room, without considering the air attenuation at a long distance, the specification of the patch target plate is determined, and the identification effect is distinguished by the human eye, which is very subjective and cannot truly and objectively distinguish the MRTD performance of the detector.

[0004] (2) Bar-shaped infrared feature target test method. In order to test the influence of the air attenuation of the infrared target on the infrared detector, the bar-shaped infrared target has been gradually developed. A plurality of (generally four) long strip heat targets of different widths are placed on the target plate perpendicular to the ground at a long distance. The heat target emits infrared waves after being powered on, and then the detector is used to observe at a long distance, and the number of the bar-shaped target that can be clearly observed is reported, and then the MRTD performance of the detector is judged. This test method considers the attenuation of air to infrared waves, but the observation result is still subjective judgment, and there is no clear boundary between clear and unclear, resulting in unscientific and rigorous test results.

[0005] (3) Objective measurement method based on neural network. The specific test method is that it is highly subjective to evaluate the MRTD parameters obtained by the human eye's judgment of the four-bar target image formed by the thermal imager. Moreover, with many influencing parameters, it is difficult to provide an objective judgment criterion. The objective measurement method based on neural network simulates the structure and function of the brain and nervous system of organisms. Through self-learning and using the development achievements of computer intelligence, it extracts and identifies the features of the infrared thermal image, and then conducts self-learning to describe and judge the results. This method requires establishing a large number of outdoor test sample databases to train the algorithm, and there is no clear standard for the recognition performance of the computer, resulting in the influence on the test objectivity of this method. Summary of the Invention

[0006] In view of the deficiencies of the prior art, the present invention provides a detection system and a detection method for the MRTD performance of an infrared detector, which can detect the performance of the infrared detector in an outdoor test environment, can be free from the influence of subjective factors, and can objectively distinguish the MRTD performance of the infrared detector.

[0007] In order to achieve the above object, the technical solution of the present invention is as follows:

[0008] A detection system for the MRTD performance of an infrared detector, including a target rack for vertically supporting a thermal target, a wind shield is provided inside the target rack frame, and multiple segments of infrared thermal films for detecting the MRTD performance of the infrared detector are laid on the wind shield;

[0009] On one side of the target rack, there is a relay for controlling the connection or disconnection of the infrared thermal film. The relay is electrically connected to multiple segments of infrared thermal films through wires respectively. On one side of the relay, there is a temperature difference controller connected through a wire for adjusting the surface temperature of the infrared thermal film. A remote control receiver is installed inside the temperature difference controller, and the remote control receiver is wirelessly connected to a remote controller;

[0010] The infrared detector is placed far away directly opposite the target rack, and it can detect the imaging effects of different numbers transformed by the infrared thermal film; the remote controller is located beside the infrared detector and is used to remotely control the infrared thermal film to present imaging patterns of different numbers.

[0011] Preferably, the multiple segments of infrared thermal films are divided into seven segments in total, and the seven segments of infrared thermal films are spliced into the shape of the digital character 'day' on the wind shield.

[0012] Preferably, the infrared thermal film can present a total of ten different numbers 0-1-2-3-4-5-6-7-8-9 on the wind shield under the control of the remote controller.

[0013] Preferably, the relay is a solid-state relay.

[0014] A detection method for the MRTD performance of an infrared detector includes the following steps:

[0015] S1, fixing the wind shield in the frame of the target frame, and splicing the multiple infrared thermal films on the wind shield into the shape of the digital word "Sun" according to the coding order;

[0016] S2, respectively connecting the multiple infrared thermal films to the corresponding coded ports of the output end of the relay array through wires according to the coding order;

[0017] S3, installing the remote control receiver in the temperature difference controller, and connecting the temperature difference controller to the input end of the relay through wires;

[0018] S4, connecting the temperature difference controller to the power supply, and observing the imaging effect of the thermal image number by adjusting the temperature difference controller to control the multiple infrared thermal films to present different thermal image numbers;

[0019] S5, placing the infrared detector at a high point 1 km away from the target frame, so as to echo the front face of the target frame;

[0020] S6, using the remote controller to control the temperature difference controller to control the on and off of the infrared thermal films of different numbers connected to the output end of the relay, so that the infrared thermal films present different thermal image numbers on the wind shield, and the infrared imaging effect of the different thermal image numbers is observed through the ocular lens of the infrared detector;

[0021] When the infrared imaging observed through the ocular lens of the infrared detector is consistent with the thermal image number, the infrared thermal film on the wind shield is replaced by an infrared thermal film of a smaller size relative to the last round, the remote controller is used to control the temperature difference controller to control the on and off of the infrared thermal films of different numbers connected to the output end of the relay, so that the infrared thermal films present different thermal image numbers on the wind shield, and the infrared imaging effect of the different thermal image numbers is observed through the ocular lens of the infrared detector;

[0022] S7, according to the mode in S6, the multiple infrared thermal films are replaced for multiple rounds to be smaller in size relative to the last round, and the remote controller is used to control the temperature difference controller to control the on and off of the infrared thermal films of different numbers connected to the output end of the relay, so that the infrared thermal films present different thermal image numbers on the wind shield, and whether the generated number of each round and the infrared imaging number recognized by the infrared detector are consistent is observed through the ocular lens of the infrared detector, when the consistency does not appear in one round, the smallest distinguishable temperature difference of the infrared detector is determined.

[0023] Technical effects and advantages of the present application:

[0024] The application provides an infrared detector MRTD performance detection system, which is characterized in that: the infrared heat film is divided into seven sections, a remote controller is used to control the heating temperature difference of each section of the infrared heat film through a temperature difference controller, and a relay is used to control the on-off of each section of the infrared heat film, so that 0-1-2-3-4-5-6-7-8-9, a total of ten different numbers, can be presented on the wind deflector, and each number can be presented for 1 minute, which is convenient for checking the digital infrared imaging effect through the ocular lens of the infrared detector, after one round of detection, the infrared heat film is replaced with a finer one, and a different digital pattern from 0 to 9 is randomly generated, and through the ocular lens of the infrared detector, whether the generated digital pattern in each round is consistent with the infrared imaging digital pattern recognized by the infrared detector is checked, until inconsistency occurs, the minimum resolvable temperature difference of the infrared detector can be detected, so that the MRTD performance of the infrared detector can be objectively distinguished without being affected by subjective factors; the temperature difference of the infrared heat film can be controlled through the combination of the controller, the temperature difference controller and the relay, so that the infrared wave of the infrared heat film can be adjusted according to the external field environment, and the attenuation of the infrared wave caused by the long detection distance and the air does not need to be considered, so that the MRTD performance of the infrared detector in the external field test environment can be detected. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is a structure schematic diagram of the infrared detector MRTD performance detection system of the application.

[0026] In the figure, 1 is a target frame, 2 is a wind deflector, 3 is an infrared heat film, 4 is a relay, 5 is a temperature difference controller, 6 is a remote controller, and 7 is an infrared detector. DETAILED DESCRIPTION

[0027] The application is further described in detail in connection with the embodiments given below and the accompanying drawings.

[0028] Embodiment 1

[0029] Referring to Figure 1 , an infrared detector MRTD performance detection system includes a target frame 1, a wind deflector 2, an infrared heat film 3, a relay 4, a temperature difference controller 5 and a remote controller 6.

[0030] In specific implementation, referring to Figure 1 , the target frame 1 is used for vertically supporting the heat target, and the lower end of the target frame 1 is fixed on the ground.

[0031] In specific implementation, referring to Figure 1 , the wind deflector 2 is arranged in the target frame 1, and the wind deflector 2 can be used for wind shielding and laying the infrared heat film 3. The wind deflector 2 is laid with a plurality of infrared heat films 3 for detecting the MRTD performance of the infrared detector 7.

[0032] In specific implementation, referring toFigure 1 As shown in the figure, the multi-segment infrared thermal film 3 is divided into seven segments, and the seven segments of the infrared thermal film 3 are spliced into the shape of the Chinese character "Ri" in the coding order on the windshield 2.

[0033] In specific implementation, the coding order can be numerical coding such as numbers 1, 2, 3, 4, 5, 6, 7 or alphabetical coding A, B, C, D, E, F, G, etc., and the infrared thermal film 3 is spliced in sequence according to the writing order of the Chinese character "Ri".

[0034] In specific implementation, the remote controller 6 can control the temperature difference controller 5 and the relay 4 to present 0-1-2-3-4-5-6-7-8-9, a total of ten different numbers, of the infrared thermal film 3 on the windshield 2.

[0035] In specific implementation, referring to Figure 1 As shown in the figure, one side of the target frame 1 is provided with a relay 4 for controlling the on or off of the multi-segment infrared thermal film 3.

[0036] In specific implementation, the relay 4 is a solid-state relay. The array output end of the relay 4 is connected in sequence with the multi-segment infrared thermal film 3 through wires in the coding order of the infrared thermal film 3.

[0037] In specific implementation, referring to Figure 1 As shown in the figure, one side of the relay 4 is connected with a temperature difference controller 5 for adjusting the surface temperature of the infrared thermal film 3 through wires, and a remote receiver is installed in the temperature difference controller 5. The remote receiver is wirelessly connected with a remote controller 6 for receiving signals controlled by the remote controller 6.

[0038] In specific implementation, the remote controller 6 controls the on-off of the relay 4 array to achieve the purpose of controlling the heating or not heating of the infrared thermal film 3. Through the temperature difference controller 5, the temperature data of the surface of the heating film, the background temperature data and the set temperature difference are compared to form a control deviation, and the voltage output changes with time and environment to achieve the purpose of stabilizing the surface temperature of the heating film.

[0039] In specific implementation, referring to Figure 1 As shown in the figure, the infrared detector 7 is placed at a high place opposite the target frame 1 and corresponds to the infrared thermal film 3, and is used to detect the imaging effect of different numbers changed by the infrared thermal film 3 after heating.

[0040] In specific implementation, referring to Figure 1 As shown in the figure, the remote controller 6 is located beside the infrared detector 7 for remotely controlling the infrared thermal film 3 to change different imaging patterns.

[0041] In specific implementation, the infrared thermal film 3 has a fast heating rate and uniform heating. It can be arbitrarily replaced with different widths of thermal film sizes according to the MRTD performance detection requirements of the infrared detector, so as to achieve the purpose of detecting the performance of the infrared detector 7 under field tests, and has high universality.

[0042] Embodiment 2

[0043] A method for detecting the MRTD performance of an infrared detector includes the following steps:

[0044] S1. Fix the windshield 2 inside the frame of the target rack 1, and splice multiple segments of infrared thermal film 3 on the windshield 2 in the shape of the Chinese character "日" according to the coding order;

[0045] S2. Connect multiple segments of infrared thermal film 3 to the ports of the array output end of the relay 4 in sequence through wires according to the coding order;

[0046] S3. Install the remote control receiver in the temperature difference controller 5, and connect the temperature difference controller 5 to the input end of the relay 4 through a wire;

[0047] S4. Connect the temperature difference controller 5 to the power supply, and control the temperature difference of multiple segments of infrared thermal film 3 by debugging the temperature difference controller 5 to make it present different thermal image numbers, and observe the imaging effect of the thermal image numbers;

[0048] S5. Place the infrared detector 7 at a high point one kilometer away from the target rack 1 so that it corresponds to the front of the infrared thermal film 3;

[0049] S6. Use the remote control 6 to control the temperature difference controller 5 to control the on and off of different numbered infrared thermal films 3 connected to the output end of the relay 4, so that the infrared thermal film 3 presents different thermal image numbers on the windshield 2, and view the infrared imaging effect of different thermal image numbers through the eyepiece of the infrared detector 7;

[0050] When the infrared imaging viewed through the eyepiece of the infrared detector 7 is consistent with the thermal image number, replace the infrared thermal film 3 on the windshield 2 with a smaller size infrared thermal film 3 than the previous round. Use the remote control 6 to control the temperature difference controller 5 to control the on and off of different numbered infrared thermal films 3 connected to the output end of the relay 4, so that the infrared thermal film 3 presents different thermal image numbers on the windshield 2, and view the infrared imaging effect of different thermal image numbers through the eyepiece of the infrared detector 7;

[0051] S7, according to the manner in S6, the multi-segment infrared thermal film 3 is replaced for multiple times smaller size relative to the last round, and the temperature difference controller 5 is controlled by the remote controller 6 to control the on and off of the different numbered infrared thermal film 3 connected to the output end of the relay 4, so that the infrared thermal film 3 presents different thermal image numbers on the windshield 2, and the generated numbers of each round and the infrared imaging numbers recognized by the infrared detector 7 are checked through the eyepiece of the infrared detector 7, and when there is an inconsistency in one round, it is regarded as the minimum distinguishable temperature difference of the infrared detector.

[0052] The present application divides the infrared thermal film 3 into seven segments, controls the heating temperature difference of each segment of the infrared thermal film 3 by the temperature difference controller 5 through the remote controller 6, and controls the on and off of each segment of the infrared thermal film 3 through the relay 4, so that the windshield 2 can present 0-1-2-3-4-5-6-7-8-9, a total of ten different numbers, and each number can be presented for 1 minute, which facilitates checking the digital infrared imaging effect through the eyepiece of the infrared detector 7. After one round of detection, the infrared thermal film 3 is replaced to be finer, and different digital patterns from 0 to 9 are randomly generated. After multiple rounds of replacement, the generated numbers of each round and the infrared imaging numbers recognized by the infrared detector 7 are checked through the eyepiece of the infrared detector 7, until an inconsistency occurs, the minimum distinguishable temperature difference of the infrared detector 7 can be detected, so that the MRTD performance of the infrared detector 7 can be objectively distinguished without being affected by subjective factors; the temperature difference of the infrared thermal film can be controlled by the combination of the controller 6, the temperature difference controller 5 and the relay 4, so that the infrared wave of the infrared thermal film 3 can be adjusted according to the external environment, without considering the attenuation of the infrared wave due to the long detection distance and the air, so that the MRTD performance of the infrared detector 7 can be detected under the external field test environment.

[0053] The above only describes the preferred embodiments of the present application, and it should be noted that for those skilled in the art, without departing from the inventive concept, several modifications and improvements can be made, which are all within the protection scope of the present application.

Claims

1. A system for detecting the MRTD performance of an infrared detector, characterized in that: The utility model relates to a target frame (1) for erecting and supporting a hot target, which is provided with a wind shield (2) in the frame, and a plurality of infrared thermal films (3) for detecting the MRTD performance of an infrared detector (7) are arranged on the wind shield (2). A relay (4) for controlling the on-off of the infrared thermal films (3) is arranged on one side of the target frame (1), and the relay (4) is electrically connected to the plurality of infrared thermal films (3) through wires. A thermoelectric controller (5) for adjusting the surface temperature of the infrared thermal films (3) is connected to one side of the relay (4) through wires. A remote control receiver is installed in the thermoelectric controller (5), and the remote control receiver is wirelessly connected to a remote controller (6). The plurality of infrared thermal films (3) are divided into seven segments, and the seven segments of the infrared thermal films (3) are spliced into the shape of the Chinese character "Ri" on the wind shield (2). The infrared thermal films (3) can present ten different numbers (0-1-2-3-4-5-6-7-8-9) on the wind shield (2) under the control of the remote controller (6). The infrared detector (7) is arranged at a distance opposite to the target frame (1), and it can detect the imaging effect of the infrared thermal films (3) changing different numbers. The remote controller (6) is located beside the infrared detector (7) and is used for remotely controlling the infrared thermal films (3) to present different imaging patterns of numbers.

2. The system for detecting MRTD performance of an infrared detector according to claim 1, wherein: The relay (4) is a solid-state relay.

3. A method of detecting MRTD performance of an infrared detector according to any one of claims 1-2, characterized in that: The utility model comprises the following steps: S1, fixing the wind shield (2) in the frame of the target frame (1), and splicing the plurality of infrared thermal films (3) into the shape of the Chinese character "Ri" on the wind shield (2) according to the coding order; S2, connecting the plurality of infrared thermal films (3) to the corresponding coded ports of the output end of the relay (4) array through wires according to the coding order; S3, installing the remote control receiver in the thermoelectric controller (5), and connecting the thermoelectric controller (5) to the input end of the relay (4) through wires; S4, connecting the thermoelectric controller (5) to the power supply, and adjusting the thermoelectric controller (5) to control the plurality of infrared thermal films (3) to present different thermal image numbers on the wind shield (2), and observing the imaging effect of the adjusted thermal image numbers; S5, arranging the infrared detector (7) at a high point 1 km away from the target frame (1) so that it is in correspondence with the front of the infrared thermal films (3); S6, using the remote controller (6) to control the thermoelectric controller (5) to control the on-off of the infrared thermal films (3) connected to the output end of the relay (4) of different numbers, so that the infrared thermal films (3) present different thermal image numbers on the wind shield (2), and the infrared imaging effect of different thermal image numbers is observed through the ocular lens of the infrared detector (7). When the infrared imaging viewed through the eyepiece of the infrared detector (7) is consistent with the thermal image number, the infrared thermal film (3) on the windshield (2) is replaced with an infrared thermal film (3) of a smaller size relative to the previous round, and the on and off of the different numbered infrared thermal films (3) connected to the output end of the relay (4) is controlled by the temperature difference controller (5) operated by the remote controller (6), so that the infrared thermal film (3) presents different thermal image numbers on the windshield (2), and the infrared imaging effect of different thermal image numbers is viewed through the eyepiece of the infrared detector (7); S7、According to the manner in S6, the multiple infrared thermal films (3) are replaced in multiple rounds with sizes smaller than the previous round, and the on and off of the different numbered infrared thermal films (3) connected to the output end of the relay (4) is controlled by the temperature difference controller (5) operated by the remote controller (6), so that the infrared thermal film (3) presents different thermal image numbers on the windshield (2), and whether the generated number of each round and the infrared imaging number recognized by the infrared detector (7) are consistent is viewed through the eyepiece of the infrared detector (7), when one of the rounds is inconsistent, it is considered as the minimum resolvable temperature difference of the infrared detector.

Images