High-frame-frequency large-view-field short-wave dual-band detection device

Abstract

The invention provides a high-frame-frequency large-field-of-view short-wave dual-band detection device, which belongs to the technical field of airborne photoelectric detection, and specifically comprises the following steps: a first optical system receives target and background infrared radiation energy in a specified field of view, and converges the target and background infrared radiation energy to a first infrared detector to form a clear image; the second optical system receives target and background infrared radiation energy in a specified view field and converges the target and background infrared radiation energy to the second infrared detector to form a clear image; the transmission wave band of the first optical system is 0.9-1.1 [mu] m, the transmission wave band of the second optical system is 1.5-1.7 [mu] m, the field angles of the first optical system and the second optical system are overlapped, and the overlapping degree is greater than 99%. According to the invention, a large-view-field optical system, a short-wave infrared dual-band and high-frame-frequency detection system are adopted to realize real-time detection of a short-distance target, and detection and perception requirements of a threatening target faced by a helicopter are met.

Description

Technical Field

[0001] The present application relates to the field of airborne photoelectric detection, and in particular to a high frame rate, large field of view, short wave dual-band detection device. Background Art

[0002] The frame rate of existing airborne short-wave infrared sensors usually does not exceed 500Hz, and when sensors with larger arrays perform full-screen imaging, the amount of image data transmitted is large, and the detector window must be opened to meet the frame rate requirements. In general, the warning response time includes the staring imaging time, digital video transmission time, image and data processing time, and warning information reporting time. For targets several kilometers away, the warning response time is on the order of seconds, but if used to detect close-range targets, the warning response time needs to reach the order of milliseconds. The current detector response time is too long to meet the usage requirements. Summary of the invention

[0003] In view of this, the present application provides a high-frame rate, large-field-of-view, short-wave dual-band detection device, which solves the problems in the prior art and adopts a large-field-of-view optical system, a short-wave infrared dual-band, and a high-frame-rate detection system to achieve real-time detection of close-range targets, thereby meeting the detection and perception requirements of threatening targets faced by helicopters.

[0004] The present application provides a high frame rate, large field of view, short wave dual band detection device adopts the following technical solution:

[0005] A high frame rate, large field of view, short wave dual band detection device, comprising a first optical system, a second optical system, a first infrared detector and a second infrared detector;

[0006] The first optical system receives target and background infrared radiation energy within a specified field of view and converges it onto the first infrared detector to form a clear image;

[0007] The second optical system receives the target and background infrared radiation energy within the specified field of view, and converges it onto the second infrared detector to form a clear image;

[0008] The transmission band of the first optical system is 0.9 μm-1.1 μm, the transmission band of the second optical system is 1.5 μm-1.7 μm, and the viewing angles of the first optical system and the second optical system overlap, with an overlap degree greater than 99%.

[0009] Optionally, the frame rates of the first infrared detector and the second infrared detector are both 1000 Hz.

[0010] Optionally, the azimuth field of view angle and the elevation field of view angle of the first optical system and the second optical system are both greater than 95°.

[0011] Optionally, the high frame rate, large field of view, shortwave dual-band detection device also includes a comprehensive processing unit, which is used to process the image information output by the first infrared detector and the second infrared detector, and use background filtering, two-color judgment and other algorithms to suppress false alarms and detect and report targets.

[0012] Optionally, the first infrared detector and the second infrared detector are 256×204 superlattice infrared focal plane detectors.

[0013] Optionally, the focal lengths of the first optical system and the second optical system are both 1.85 mm, and the F numbers of the first optical system and the second optical system are both 2.

[0014] In summary, this application includes the following beneficial technical effects:

[0015] This application adopts a large field of view optical system, covering a space of more than 95°, and can detect the infrared radiation of targets in a wide space; the short-wave dual-color characteristics of the target are used for detection, 1.5μm-1.7μm is selected as the main band, and 0.9μm-1.1μm is selected as the auxiliary band. In 0.9μm-1.7μm, the target radiation of RPG gradually increases, while the radiation intensity of sunlight reflection clutter gradually decreases. The two have opposite trends, and the dual-color ratio at both ends of the band is quite different. The dual-color characteristics of the target can effectively suppress the influence of sunlight reflection and ground heat source clutter on target detection and reduce the false alarm rate.

[0016] This application uses a high frame rate real-time detection system to improve the detection probability and reaction time of targets with extremely short time characteristics such as RPGs, and reduce the missed alarm rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 This is a schematic diagram of the structure of the high frame rate, large field of view, short wave dual band detection device of this application;

[0019] Figure 2 This is a schematic diagram of the optical path of the first optical system or the second optical system of the present application.

[0020] Explanation of the reference numerals: 1. First optical system; 2. Second optical system; 3. First infrared detector; 4. Second infrared detector; 5. Integrated processing unit. DETAILED DESCRIPTION

[0021] The embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0022] The following describes the implementation methods of the present application through specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The present application can also be implemented or applied through other different specific implementation methods, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that, in the absence of conflict, the following embodiments and the features in the embodiments can be combined with each other. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work belong to the scope of protection of the present application.

[0023] It should be noted that various aspects of the embodiments within the scope of the appended claims are described below. It should be apparent that the aspects described herein can be embodied in a wide variety of forms, and any specific structure and / or function described herein is merely illustrative. Based on the present application, it should be understood by those skilled in the art that an aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number of aspects described herein can be used to implement the device and / or practice the method. In addition, other structures and / or functionalities other than one or more of the aspects described herein can be used to implement this device and / or practice this method.

[0024] It should also be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present application. The illustrations only show the components related to the present application rather than being drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed at will, and the component layout may also be more complicated.

[0025] Additionally, in the following description, specific details are provided to facilitate a thorough understanding of the examples. However, it will be understood by those skilled in the art that the aspects described may be practiced without these specific details.

[0026] The embodiment of the present application provides a high frame rate, large field of view, short wave dual-band detection device.

[0027] like Figure 1 and Figure 2 As shown, a high frame rate, large field of view, short wave dual-band detection device includes a first optical system 1, a second optical system 2, a first infrared detector 3 and a second infrared detector 4.

[0028] The first optical system 1 receives target and background infrared radiation energy within a specified field of view, and converges the energy onto the first infrared detector 3 to form a clear image.

[0029] The second optical system 2 receives the target and background infrared radiation energy within a specified field of view, and converges it onto the second infrared detector 4 to form a clear image.

[0030] The transmission band of the first optical system 1 is 0.9 μm-1.1 μm, the transmission band of the second optical system 2 is 1.5 μm-1.7 μm, and the viewing angles of the first optical system 1 and the second optical system 2 overlap, with an overlap degree greater than 99%.

[0031] The high frame rate, large field of view, short-wave dual-band detection device also includes a comprehensive processing unit 5, which is used to process the image information output by the first infrared detector 3 and the second infrared detector 4, and use background filtering, two-color judgment and other algorithms to suppress false alarms and detect and report targets.

[0032] The high frame rate, large field of view, short-wave dual-band detection device of the present application can be used for airborne target detection. The present application realizes real-time detection of RPG targets by adopting a large field of view optical system, short-wave infrared dual-band, and high frame rate detection system, meeting the detection and perception requirements of threatening targets faced by helicopters, wherein the full name of RPG is Rocket-propel ledgrenade, which means rocket-propelled grenade in Chinese.

[0033] The frame rates of the first infrared detector 3 and the second infrared detector 4 are both 1000 Hz, that is, 1000 short-wave dual-band infrared images are output simultaneously in 1 second, meeting the requirements of detecting and eliminating false alarms at the moment of RPG launch.

[0034] The azimuth viewing angle and the elevation viewing angle of the first optical system 1 and the second optical system 2 are both greater than 95°. In the embodiment of the present application, the elevation viewing angles of the first optical system 1 and the second optical system 2 are both 118°, and the azimuth viewing angles of the first optical system 1 and the second optical system 2 are both 95°.

[0035] The first infrared detector 3 and the second infrared detector 4 adopt a 256×204 superlattice infrared focal plane detector. The dual-band high frame rate infrared detector of the present application has a pixel number of 256×204 and an image resolution of 0.5°. Usually, the target detection device reports the angle information after alerting the threatening target in the field of view, and the radar device performs precise tracking to meet the guidance accuracy requirements for other equipment.

[0036] The focal lengths of the first optical system 1 and the second optical system 2 are both 1.85 mm, and the F numbers of the first optical system 1 and the second optical system 2 are both 2.

[0037] The first optical system 1 and the second optical system 2 of the present application receive energy radiation in the infrared band and converge it onto the corresponding infrared detector. The optical signal is converted, amplified, and filtered to generate dual-spectrum infrared image information, which is transmitted to the comprehensive processing unit 5 through a cable for processing. The comprehensive processing unit 5 performs background suppression, target detection, classification, and alarm processing on the infrared digital video to realize the judgment and reporting of the target.

[0038] In the process of detecting RPG, sunlight reflection from ground objects and ground heat sources are the main clutter interferences for RPG target detection. Since the spectral characteristics of clutter and RPG are different, false alarms can be eliminated through dual-band design. In this application, 1.5μm-1.7μm is used as the main band and 0.9μm-1.1μm is used as the auxiliary band. The dual-band algorithm can eliminate clutter and false alarms such as sunlight reflection and ground heat sources.

[0039] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A high frame rate, large field of view, short wave dual band detection device, characterized in that: It comprises a first optical system (1), a second optical system (2), a first infrared detector (3) and a second infrared detector (4); The first optical system (1) receives target and background infrared radiation energy within a specified field of view and converges it onto the first infrared detector (3) to form a clear image; The second optical system (2) receives target and background infrared radiation energy within a specified field of view, and converges the energy onto the second infrared detector (4) to form a clear image; The transmission band of the first optical system (1) is 0.9 μm-1.1 μm, the transmission band of the second optical system (2) is 1.5 μm-1.7 μm, and the viewing angles of the first optical system (1) and the second optical system (2) overlap, with the overlap being greater than 99%.

2. The high frame rate, large field of view, short wave dual band detection device according to claim 1, characterized in that: The frame rates of the first infrared detector (3) and the second infrared detector (4) are both 1000 Hz.

3. The high frame rate, large field of view, short wave dual band detection device according to claim 1, characterized in that: The azimuth viewing angle and the elevation viewing angle of the first optical system (1) and the second optical system (2) are both greater than 95°.

4. The high frame rate, large field of view, short wave dual band detection device according to claim 1, characterized in that: The high frame rate, large field of view, short wave dual-band detection device also includes a comprehensive processing unit (5), which is used to process the image information output by the first infrared detector (3) and the second infrared detector (4), and to suppress false alarms and detect and report targets using algorithms such as background filtering and two-color judgment.

5. The high frame rate, large field of view, short wave dual band detection device according to claim 1, characterized in that: The first infrared detector (3) and the second infrared detector (4) are 256×204 superlattice infrared focal plane detectors.

6. The high frame rate, large field of view, short wave dual band detection device according to claim 1, characterized in that: The focal lengths of the first optical system (1) and the second optical system (2) are both 1.85 mm, and the F numbers of the first optical system (1) and the second optical system (2) are both 2.

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