A real-time focusing detection device and method for airborne dual-band common-aperture photoelectric payload

Abstract

A real-time focusing detection device and method for an airborne dual-band common-aperture photoelectric load. The invention belongs to the field of optical detection technology, and specifically relates to the field of real-time focusing detection technology for an airborne dual-band common-aperture photoelectric load. The invention solves the problem of defocusing caused by vibration, temperature and altitude changes during flight. The device comprises a telescopic subsystem (1), a visible light imaging subsystem (2), an infrared imaging subsystem (3) and a spectrometer (4); the visible light imaging subsystem (2) and the infrared imaging subsystem (3) simultaneously emit light beams, which are incident on the telescopic subsystem (1) through the spectrometer (4); the telescopic subsystem (1) then reflects the light beams which are incident on the visible light imaging subsystem (2) and the infrared imaging subsystem (3) through the spectrometer (4) for imaging. The method comprises the following steps: S1, real-time focusing detection starts, a two-dimensional swing mirror (14) is extended, and a reference grating is formed at the same time; S2, imaging and forming a reference grating image; S3, real-time focusing detection.

Description

Technical Field

[0001] The invention belongs to the technical field of optical detection, and specifically relates to the technical field of real-time focusing detection of airborne dual-band common-aperture photoelectric payloads. Background Art

[0002] During the flight of modern aviation and military airborne systems, airborne optoelectronic payloads are often affected by fuselage vibration, aerodynamic disturbances and temperature changes, causing the system to defocus, thereby affecting the quality of the detection image. Traditional focusing methods mainly rely on ground test data for correction, and it is difficult to quickly adapt to environmental changes during flight. At the same time, modern systems require efficient working capabilities in both visible and infrared bands to enhance reconnaissance and target identification. However, due to the differences in the optical properties of these two bands, traditional single-band focusing technology is difficult to meet the requirements, resulting in inconsistent imaging quality in different bands. Therefore, there is an urgent need for a solution that can perform real-time and efficient focusing during flight to deal with the problem of defocusing of optical systems in dynamic environments.

[0003] To solve this problem, the present invention proposes a real-time focusing detection device and method based on a dual-optical path common-aperture photoelectric load, which can perform real-time focusing detection under different bands and complex environmental changes to ensure the quality of the detected image. Summary of the invention

[0004] In order to solve the defocusing problem caused by vibration, temperature and altitude changes during flight, the present invention provides an airborne dual-band common-aperture optoelectronic payload real-time focus detection device and method, which can perform real-time focus detection under different bands and complex environmental changes to ensure the quality of the detected image.

[0005] The airborne dual-band common aperture photoelectric load real-time focusing detection device comprises:

[0006] Telescopic subsystem, visible light imaging subsystem, infrared imaging subsystem and spectroscopic device;

[0007] The visible light imaging subsystem and the infrared imaging subsystem simultaneously emit light beams, which are emitted into the telescopic subsystem through the light splitting device. The telescopic subsystem then reflects the light beams and emits them into the visible light imaging subsystem and the infrared imaging subsystem through the light splitting device respectively for imaging.

[0008] The telescope subsystem includes a primary mirror, a secondary mirror, a folding mirror and a two-dimensional swing mirror;

[0009] The visible light imaging subsystem includes a visible light mirror group, a spectroscope I, a visible light grating, a visible light source, a visible light photosensitive element, a visible light filter and a visible light detector, and the visible light grating includes a visible light object side reference grating and a visible light image side reference grating;

[0010] The infrared imaging subsystem comprises a fast-reflecting mirror, an infrared mirror group, a spectroscope II, an infrared grating, an infrared light source, an infrared photosensitive element, an infrared filter and an infrared detector. The infrared grating comprises an infrared object-side reference grating and an infrared image-side reference grating.

[0011] Furthermore, the telescope subsystem is divided into an emission optical path and an imaging optical path; in the emission optical path, after the light beam enters the folding mirror, it passes through the secondary mirror and the primary mirror in sequence and then enters the two-dimensional swinging mirror; in the imaging optical path, after the light beam is emitted from the two-dimensional swinging mirror, it passes through the primary mirror, the secondary mirror and the folding mirror in sequence and then exits the telescope subsystem.

[0012] Furthermore, the visible light imaging subsystem is divided into a visible light emission optical path and a visible light imaging optical path; in the visible light emission optical path, the light beam emitted by the visible light source passes through the visible light object side reference grating, the beam splitter I and the visible light mirror group in sequence before emitting out of the visible light imaging subsystem, and the visible light object side reference grating is arranged on the visible light emission optical path; in the visible light imaging optical path, after the light beam enters the visible light mirror group, it is divided into two beams by the beam splitter I, one beam passes through the visible light filter and enters the visible light detector, and the other beam enters the visible light image side reference grating, and the visible light image side reference grating is arranged on the visible light imaging optical path, and the visible light object side reference grating is conjugate with the visible light image side reference grating; the visible light mirror group has a built-in visible light photoelectric focusing device.

[0013] Furthermore, the infrared imaging subsystem is divided into an infrared emission optical path and an infrared imaging optical path; in the infrared emission optical path, the light beam emitted by the infrared light source passes through the infrared object side reference grating, the spectroscope II, the infrared mirror group and the quick reflection mirror in sequence before emitting out of the infrared imaging subsystem, and the infrared object side reference grating is arranged on the infrared emission optical path; in the infrared imaging optical path, after the light beam enters the quick reflection mirror, it passes through the infrared mirror group and the spectroscope II in sequence, and the spectroscope II divides the light beam into two beams, one beam passes through the infrared filter and the infrared detector in sequence, and the other beam enters the infrared image side reference grating; the infrared image side reference grating is arranged on the infrared imaging optical path, and the infrared object side reference grating is conjugate with the infrared image side reference grating; the infrared mirror group has a built-in infrared electric-controlled focusing device.

[0014] Furthermore, the infrared photosensitive element is arranged on the equi-optical path image plane of the infrared detector; the visible light photosensitive element is arranged on the equi-optical path image plane of the visible light detector; the visible light grating is arranged on the equivalent focal plane of the visible light imaging subsystem; and the infrared grating is arranged on the equivalent focal plane of the infrared imaging subsystem.

[0015] A real-time focusing detection method for an airborne dual-band common-aperture photoelectric payload, characterized in that the real-time focusing detection method is implemented by using the above-mentioned airborne dual-band common-aperture photoelectric payload real-time focusing detection device, and the method specifically comprises:

[0016] S1, real-time focus detection begins, the two-dimensional oscillating mirror extends out, and a reference grating is formed at the same time;

[0017] S2, imaging and forming a reference grating image;

[0018] S3, real-time focus check.

[0019] Furthermore, when the real-time focusing detection of the photoelectric load begins, the two-dimensional oscillating mirror extends out and swings perpendicular to the optical axis and along the direction of the vertical grating; the reference grating is divided into a visible light reference grating and an infrared reference grating; the formation process of the visible light reference grating is: the visible light light source emits visible light to illuminate the visible light object side reference grating to form a visible light reference grating; the formation process of the infrared reference grating is: the infrared light source emits infrared light to illuminate the infrared object side reference grating to form an infrared reference grating.

[0020] Furthermore, the swing angle of the two-dimensional swing mirror is controlled by a built-in motor; the reference grating image includes a visible light reference grating image and an infrared reference grating image; the formation process of the visible light reference grating image and the infrared reference grating image is as follows: the visible light reference grating is emitted from the visible light emission path and then enters the emission path through a spectroscopic device, while the infrared reference grating is emitted from the infrared emission path and then enters the emission path through a spectroscopic device, the visible light reference grating and the infrared reference grating are reflected by the two-dimensional swing mirror to form a visible light reference grating image and an infrared reference grating image; the visible light reference grating image, the infrared reference grating image and the ground scene are radiated to The light beams of the telescope subsystem converge into a composite light beam on the primary mirror; the composite light beam is emitted from the telescope subsystem through the imaging optical path and enters the spectroscopic device, which splits the composite light beam into two beams, an infrared composite light beam is reflected into the infrared imaging optical path to form an infrared imaging and infrared light modulation signal; a visible light composite light beam is transmitted into the visible light imaging optical path to form a visible light imaging and a visible light modulation signal; the infrared composite light beam includes the infrared light emitted by the infrared light source and the infrared light radiated by the ground scene; the visible light composite light beam includes the visible light emitted by the visible light source and the visible light radiated by the ground scene.

[0021] Furthermore, the infrared imaging is specifically implemented as follows: the infrared composite light beam passes through an infrared filter to filter out the infrared light emitted by the infrared light source, and then is emitted into the infrared detector for imaging; the visible light imaging is specifically implemented as follows: the visible light composite light beam passes through a visible light filter to filter out the visible light emitted by the visible light source, and then is emitted into the visible light detector for imaging; the infrared light modulation signal is formed by: the infrared composite light beam passes through an infrared image side reference grating and is emitted into an infrared photosensitive element, and the infrared photosensitive element converts the received infrared composite light beam into an infrared light modulation signal; the visible light modulation signal is formed by: the visible light composite light beam passes through a visible light image side reference grating and is emitted into a visible light photosensitive element, and the visible light photosensitive element converts the received visible light composite light beam into a visible light modulation signal.

[0022] Furthermore, the real-time focus detection is specifically implemented as follows: the visible light electric-controlled focusing device completes the focusing of the visible light imaging by analyzing the visible light modulation signal and the swing angle of the two-dimensional swing mirror; at the same time, the infrared electric-controlled focusing device completes the focusing of the infrared imaging by analyzing the infrared light modulation signal and the swing angle of the two-dimensional swing mirror; when the visible light modulation signal and the infrared light modulation signal reach the maximum value at the same time, the visible light imaging subsystem and the infrared imaging subsystem are focused, the real-time focus detection of visible light and infrared ends, the visible light light source and the infrared light source are turned off, and the two-dimensional swing mirror is retracted.

[0023] The beneficial effects of the method of the present invention are:

[0024] (1) Compared with the traditional focusing method, when the flight status or external conditions change, the present invention no longer relies on the correction of ground test data, but uses the real-time data in flight to make immediate adjustments, which greatly improves the adaptability and response speed of the system.

[0025] (2) The present invention realizes synchronous focusing detection in different bands, ensuring that the imaging quality of the two bands remains at a high level in complex environments (such as at night or in bad weather), thereby improving the overall efficiency and detection speed of the system, reducing the time for single-band switching or multiple adjustments, and having strong adaptability, and being able to continuously provide stable performance in extreme environments such as high altitude and low temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a structural diagram of a detection device according to Embodiment 1 of the present invention;

[0027] Figure 2 A detailed diagram of a two-dimensional oscillating mirror in a detection device according to Embodiment 1 of the present invention;

[0028] Figure 3 is a flow chart of the method of embodiment 2 of the present invention;

[0029] Figure 4 This is a waveform diagram of a visible light modulation signal and an infrared light modulation signal generated by the focusing detection method of Example 2 of the present invention. DETAILED DESCRIPTION

[0030] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the protection scope of the present invention.

[0031] Embodiment 1,

[0032] This embodiment provides an airborne dual-band common aperture photoelectric payload real-time focus detection device, such as Figure 1 As shown, the device comprises:

[0033] Telescopic subsystem 1, visible light imaging subsystem 2, infrared imaging subsystem 3 and spectroscopic device 4.

[0034] The visible light imaging subsystem 2 and the infrared imaging subsystem 3 simultaneously emit light beams, which are incident on the telescopic subsystem 1 through the spectrometer 4. The telescopic subsystem 1 then reflects the light beams which are incident on the visible light imaging subsystem 2 and the infrared imaging subsystem 3 through the spectrometer 4 for imaging.

[0035] The spectroscopic device 4 is arranged at the rear of the telescopic subsystem, and is used to transmit the visible light beam and reflect the infrared light beam; the telescopic subsystem 1, the visible light imaging subsystem 2, the infrared imaging subsystem 3 and the spectroscopic device 4 all maintain the consistency of the optical axis.

[0036] The telephoto subsystem 1 includes a primary mirror 11 , a secondary mirror 12 , a folding mirror 13 and a two-dimensional swing mirror 14 .

[0037] The telescope subsystem 1 is divided into an emission optical path and an imaging optical path; in the emission optical path, after the light beam enters the folding mirror 13, it passes through the secondary mirror 12 and the primary mirror 11 in sequence and then enters the two-dimensional swing mirror 14; in the imaging optical path, after the light beam is emitted from the two-dimensional swing mirror 14, it passes through the primary mirror 11, the secondary mirror 12 and the folding mirror 13 in sequence and then exits the telescope subsystem 1.

[0038] like Figure 2 As shown, the two-dimensional swing mirror 14 is specifically an electric control device, which is arranged in front of the telescopic subsystem.

[0039] The visible light imaging subsystem 2 includes a visible light mirror group 21, a spectroscope I 22, a visible light grating 23, a visible light source 24, a visible light photosensitive element 25, a visible light filter 26 and a visible light detector 27. The visible light grating 23 includes a visible light object-side reference grating and a visible light image-side reference grating.

[0040] The visible light imaging subsystem 2 is divided into a visible light emission optical path and a visible light imaging optical path; in the visible light emission optical path, the light beam emitted by the visible light source 24 passes through the visible light object side reference grating, the spectroscope I 22 and the visible light mirror group 21 in sequence before emitting out of the visible light imaging subsystem 2, and the visible light object side reference grating is arranged on the visible light emission optical path; in the visible light imaging optical path, after the light beam enters the visible light mirror group 21, it is divided into two beams by the spectroscope I 22, one beam passes through the visible light filter 26 and enters the visible light detector 27, and the other beam enters the visible light image side reference grating, and the visible light image side reference grating is arranged on the visible light imaging optical path, and the visible light object side reference grating is conjugate with the visible light image side reference grating.

[0041] The visible light mirror group 21 has a built-in visible light photoelectric focusing device, which is used to perform focal length compensation when the visible light imaging subsystem 2 is out of focus during the focus detection process to ensure the clarity and accurate focus of the image; the visible light grating 23 is arranged on the equivalent focal plane of the visible light imaging subsystem 2; the visible light photosensitive element 25 is arranged on the equal optical path image plane of the visible light detector 27 to ensure the consistency of the measurement between the visible light photosensitive element 25 and the visible light detector 27.

[0042] The infrared imaging subsystem 3 includes a quick-reflection mirror 31 , an infrared mirror group 32 , a beam splitter II 33 , an infrared grating 34 , an infrared light source 35 , an infrared photosensitive element 36 , an infrared filter 37 and an infrared detector 38 .

[0043] The infrared imaging subsystem 3 is divided into an infrared emission optical path and an infrared imaging optical path; in the infrared emission optical path, the light beam emitted by the infrared light source 35 passes through the infrared object reference grating, the spectroscope II 33, the infrared mirror group 32 and the quick reflection mirror 31 in sequence before emitting out of the infrared imaging system 3, and the infrared object reference grating is arranged on the infrared emission optical path; in the infrared imaging optical path, after the light beam enters the quick reflection mirror 31, it passes through the infrared mirror group 32 and the spectroscope II 33 in sequence, and the spectroscope II 33 divides the light beam into two beams, one beam passes through the infrared filter 37 and the infrared detector 38 in sequence, and the other beam enters the infrared image reference grating, and the infrared image reference grating is arranged on the infrared imaging optical path, and the infrared object reference grating and the infrared image reference grating are conjugate.

[0044] The infrared mirror group 32 has a built-in infrared electric-controlled focusing device, which is used to perform focal length compensation when the infrared imaging subsystem 3 is out of focus during the focusing process to ensure image clarity and accurate focus; the infrared grating 34 is arranged on the equivalent focal plane of the infrared imaging subsystem 3; the infrared photosensitive element 36 is arranged on the equal-optical path image plane of the infrared detector 38 to ensure the consistency of measurement between the infrared photosensitive element 36 and the infrared detector 38.

[0045] Embodiment 2,

[0046] This embodiment is a further limitation of Embodiment 1. The real-time focus detection method is implemented by using the above-mentioned airborne dual-band common-aperture photoelectric load real-time focus detection device. The method comprises the following steps:

[0047] S1, real-time focus detection begins, the two-dimensional swing mirror 14 extends out, and a reference grating is formed at the same time.

[0048] When the real-time focusing detection of the photoelectric load begins, the two-dimensional oscillating mirror 14 extends out and is perpendicular to the optical axis, and oscillates back and forth in a small amplitude along the grating engraving direction; the visible light source 24 emits visible light to illuminate the visible light object side reference grating to form a visible light reference grating; at the same time, the infrared light source 35 emits infrared light to illuminate the infrared object side reference grating to form an infrared reference grating.

[0049] The swing angle of the two-dimensional swing mirror 14 is controlled by a built-in motor. By adjusting the angle of the two-dimensional swing mirror 14, the angle of the light beam reflected by the two-dimensional swing mirror 14 can be changed; the visible light source 24 is monochromatic light, and its working band is smaller than the working band of the visible light detector 27; the visible light grating 23 has a precise periodic structure, which is used to diffract the incident light beam and generate an interference pattern; the infrared light source 35 is monochromatic light, and its working band is smaller than the working band of the infrared detector 38; the infrared grating 34 has a precise periodic structure, which is used to diffract the incident light beam and generate an interference pattern.

[0050] S2, imaging and forming a reference grating image.

[0051] The visible light reference grating is emitted through the visible light emission path and then is emitted into the emission path through the spectrometer 4. At the same time, the infrared reference grating is emitted through the infrared emission path and then is emitted into the emission path through the spectrometer 4. The visible light reference grating and the infrared reference grating are reflected by the two-dimensional oscillating mirror 14 to form a visible light reference grating image and an infrared reference grating image. At this time, the visible light reference grating image, the infrared reference grating image and the light beam radiated from the ground scene to the telescope subsystem 1 converge on the main mirror 11 to form a composite light beam. The composite light beam is emitted from the telescope subsystem 1 through the imaging light path and is emitted into the spectrometer 4. The spectrometer 4 divides the composite light beam into two , a beam of infrared composite light beam is reflected and enters the infrared imaging optical path. The infrared composite light beam includes the infrared light emitted by the infrared light source 35 and the infrared light radiated by the ground scene. The spectroscope II 33 divides the infrared composite light beam into two beams. One beam enters the infrared filter 37 to filter out the infrared light emitted by the infrared light source 35, and then enters the infrared detector 38 for imaging. The other beam enters the infrared image side reference grating and falls in front of or behind the infrared image side reference grating. At this time, the infrared reference grating image and the infrared image side reference grating partially overlap. The infrared composite light beam of the overlapping part of the infrared reference grating image and the infrared image side reference grating enters the infrared photosensitive element 36. The infrared photosensitive element 36 converts the received infrared composite light beam into an infrared light modulation signal. The amplitude of the infrared light modulation signal changes according to the adjustment of the swing angle of the two-dimensional swing mirror 14. When the infrared reference grating image and the infrared reference grating completely overlap, the infrared light modulation signal is maximum. A beam of visible light composite light beam is transmitted into the visible light imaging optical path. The visible light composite light beam includes the visible light emitted by the visible light source 24 and the visible light radiated by the ground scene. The beam splitter I 22 divides the visible light composite light beam into two beams. One beam is emitted into the visible light filter 26 to filter out the visible light emitted by the visible light source 24, and then emitted into the visible light detector. The detector 27 forms an image, and a beam of visible light is incident on the image-side reference grating and falls in front of or behind the image-side reference grating. At this time, the image of the visible light reference grating partially overlaps with the image-side reference grating. The composite light beam of visible light of the overlapping part of the visible light reference grating image and the image-side reference grating is incident on the visible light photosensitive element 25. The visible light photosensitive element 25 converts the received composite light beam of visible light into a visible light modulation signal. The amplitude of the visible light modulation signal changes according to the adjustment of the swing angle of the two-dimensional swing mirror 14. When the visible light reference grating image and the visible light reference grating completely overlap, the visible light modulation signal is maximum.

[0052] S3, real-time focus check.

[0053] The infrared electric focusing device and the visible light electric focusing device adjust the front and rear positions of the visible light reference grating image and the infrared reference grating image on the image side focal plane of the visible light imaging subsystem 2 and the infrared imaging subsystem 3 by analyzing the amplitude changes of the infrared light modulation signal and the visible light modulation signal and the swing angle of the two-dimensional swing mirror 14, thereby achieving focusing and making the visible light detector 27 and the infrared detector 38 reach the best imaging state; Figure 4 As shown, the ordinate represents the amplitude of the modulation signal, and the abscissa represents the time of focusing. When the visible light modulation signal and the infrared light modulation signal are less than the maximum value, the visible light imaging subsystem 2 and the infrared imaging subsystem 3 are out of focus. When the visible light modulation signal and the infrared light modulation signal reach the maximum value at the same time, the visible light imaging subsystem 2 and the infrared imaging subsystem 3 are in focus. At this time, the imaging of the visible light detector 27 and the infrared detector 38 is the clearest, the real-time focusing test of visible light and infrared light is completed, the visible light source 24 and the infrared light source 35 are turned off, and the two-dimensional swing mirror 14 is retracted without affecting the light aperture of the airborne optoelectronic payload.

Claims

1. An airborne dual-band common aperture photoelectric load real-time focusing detection device, characterized in that: The device comprises a telescopic subsystem (1), a visible light imaging subsystem (2), an infrared imaging subsystem (3) and a spectroscopic device (4); The visible light imaging subsystem (2) and the infrared imaging subsystem (3) simultaneously emit light beams, which are incident upon the telescopic subsystem (1) via the light splitting device (4); the telescopic subsystem (1) then reflects the light beams which are incident upon the light splitting device (4) and are respectively incident upon the visible light imaging subsystem (2) and the infrared imaging subsystem (3) to form images; The telescopic subsystem (1) comprises a primary mirror (11), a secondary mirror (12), a folding mirror (13) and a two-dimensional swinging mirror (14); The visible light imaging subsystem (2) comprises a visible light mirror group (21), a beam splitter I (22), a visible light grating (23), a visible light light source (24), a visible light photosensitive element (25), a visible light filter (26) and a visible light detector (27), wherein the visible light grating (23) comprises a visible light object-side reference grating and a visible light image-side reference grating; The infrared imaging subsystem (3) comprises a fast-reflecting mirror (31), an infrared mirror group (32), a beam splitter II (33), an infrared grating (34), an infrared light source (35), an infrared photosensitive element (36), an infrared filter (37) and an infrared detector (38); the infrared grating (34) comprises an infrared object-side reference grating and an infrared image-side reference grating.

2. The airborne dual-band common-aperture photoelectric payload real-time focusing detection device according to claim 1, characterized in that: The telescopic subsystem (1) is divided into an emission optical path and an imaging optical path; in the emission optical path, after the light beam enters the folding mirror (13), it passes through the secondary mirror (12) and the primary mirror (11) in sequence and then enters the two-dimensional swing mirror (14); in the imaging optical path, after the light beam is emitted from the two-dimensional swing mirror (14), it passes through the primary mirror (11), the secondary mirror (12) and the folding mirror (13) in sequence and then exits the telescopic subsystem (1).

3. The airborne dual-band common aperture photoelectric load real-time focusing detection device according to claim 2, characterized in that: The visible light imaging subsystem (2) is divided into a visible light emission optical path and a visible light imaging optical path; in the visible light emission optical path, a light beam emitted by a visible light source (24) passes through a visible light object side reference grating, a beam splitter I (22) and a visible light mirror group (21) in sequence before exiting the visible light imaging subsystem (2); the visible light object side reference grating is arranged on the visible light emission optical path; in the visible light imaging optical path, after the light beam enters the visible light mirror group (21), the light beam is split into two beams by the beam splitter I (22), one beam passes through a visible light filter (26) and enters a visible light detector (27), and the other beam enters a visible light image side reference grating; the visible light image side reference grating is arranged on the visible light imaging optical path, and the visible light object side reference grating is conjugate with the visible light image side reference grating; the visible light mirror group (21) has a built-in visible light photoelectric focusing device.

4. The airborne dual-band common aperture photoelectric payload real-time focusing detection device according to claim 3, characterized in that: The infrared imaging subsystem (3) is divided into an infrared emission optical path and an infrared imaging optical path. In the infrared emission optical path, the light beam emitted by the infrared light source (35) passes through the infrared object reference grating, the spectroscope II (33), the infrared mirror group (32) and the quick-reflection mirror (31) in sequence before being emitted from the infrared imaging subsystem (3). The infrared object reference grating is arranged on the infrared emission optical path. In the infrared imaging optical path, after the light beam enters the quick-reflection mirror (31), it passes through the infrared mirror group (32) and the spectroscope II (33) in sequence. The spectroscope II (33) divides the light beam into two beams, one of which passes through the infrared filter (37) and the infrared detector (38) in sequence, and the other enters the infrared image reference grating. The infrared image reference grating is arranged on the infrared imaging optical path, and the infrared object reference grating is conjugate with the infrared image reference grating. The infrared mirror group (32) has a built-in infrared electric-controlled focusing device.

5. The airborne dual-band common aperture photoelectric load real-time focusing detection device according to claim 4, characterized in that: The infrared photosensitive element (36) is arranged on the equal optical path image plane of the infrared detector (38); the visible light photosensitive element (25) is arranged on the equal optical path image plane of the visible light detector (27); the visible light grating (23) is arranged on the equivalent focal plane of the visible light imaging subsystem (2); and the infrared grating (34) is arranged on the equivalent focal plane of the infrared imaging subsystem (3).

6. A real-time focusing detection method for airborne dual-band common-aperture optoelectronic payload, characterized in that: The real-time focusing detection method is implemented by using the airborne dual-band common-aperture photoelectric load real-time focusing detection device according to claim 5, and the method specifically comprises: S1, real-time focus detection starts, the two-dimensional swing mirror (14) extends out, and a reference grating is formed at the same time; S2, imaging and forming a reference grating image; S3, real-time focus check.

7. The real-time focusing detection method for airborne dual-band common-aperture optoelectronic payload according to claim 6 is characterized in that: When the real-time focusing of the photoelectric load begins, the two-dimensional swing mirror (14) extends out and swings perpendicular to the optical axis and along the direction of the vertical grating. The reference grating is divided into a visible light reference grating and an infrared reference grating. The formation process of the visible light reference grating is as follows: the visible light source (24) emits visible light to illuminate the visible light object side reference grating to form the visible light reference grating; the formation process of the infrared reference grating is as follows: the infrared light source (35) emits infrared light to illuminate the infrared object side reference grating to form the infrared reference grating.

8. The real-time focusing detection method for airborne dual-band common-aperture optoelectronic payload according to claim 7 is characterized in that: The swing angle of the two-dimensional swing mirror (14) is controlled by a built-in motor; the reference grating image comprises a visible light reference grating image and an infrared reference grating image; the formation process of the visible light reference grating image and the infrared reference grating image is as follows: the visible light reference grating is emitted through the visible light emission path and then enters the emission path through the spectroscopic device (4); at the same time, the infrared reference grating is emitted through the infrared emission path and then enters the emission path through the spectroscopic device (4); the visible light reference grating and the infrared reference grating are reflected by the two-dimensional swing mirror (14) to form the visible light reference grating image and the infrared reference grating image; the visible light reference grating image, the infrared reference grating image and the light beam radiated by the ground scene to the telescopic subsystem (1) converge on the main mirror (11) to form a composite light beam; The composite light beam is emitted from the telescope subsystem (1) through the imaging optical path and is emitted into the spectroscopic device (4). The spectroscopic device (4) splits the composite light beam into two beams. An infrared composite light beam is reflected into the infrared imaging optical path to form an infrared imaging and infrared light modulation signal; and a visible light composite light beam is transmitted into the visible light imaging optical path to form a visible light imaging and a visible light modulation signal. The infrared composite light beam includes infrared light emitted by the infrared light source (35) and infrared light radiated by ground scenery; and the visible light composite light beam includes visible light emitted by the visible light source (24) and visible light radiated by ground scenery.

9. The real-time focusing detection method of an airborne dual-band common-aperture optoelectronic payload according to claim 8, characterized in that: The infrared imaging is specifically implemented as follows: the infrared composite light beam passes through an infrared filter (37) to filter out the infrared light emitted by the infrared light source (35), and then enters the infrared detector (38) for imaging; the visible light imaging is specifically implemented as follows: the visible light composite light beam passes through a visible light filter (26) to filter out the visible light emitted by the visible light source (24), and then enters the visible light detector (27) for imaging; the infrared light modulation signal is formed as follows: the infrared composite light beam passes through an infrared image side reference grating to enter the infrared photosensitive element (36), and the infrared photosensitive element (36) converts the received infrared composite light beam into an infrared light modulation signal; the visible light modulation signal is formed as follows: the visible light composite light beam passes through a visible light image side reference grating to enter the visible light photosensitive element (25), and the visible light photosensitive element (25) converts the received visible light composite light beam into a visible light modulation signal.

10. The real-time focusing detection method of an airborne dual-band common-aperture optoelectronic payload according to claim 9, characterized in that: The specific implementation of the real-time focusing detection is as follows: the visible light electric control focusing device completes the focusing of the visible light imaging by analyzing the visible light modulation signal and the swing angle of the two-dimensional swing mirror (14); at the same time, the infrared electric control focusing device completes the focusing of the infrared imaging by analyzing the infrared light modulation signal and the swing angle of the two-dimensional swing mirror (14); when the visible light modulation signal and the infrared light modulation signal reach the maximum value at the same time, the visible light imaging subsystem (2) and the infrared imaging subsystem (3) are in focus, the visible light and infrared real-time focusing detection ends, the visible light source (24) and the infrared light source (35) are turned off, and the two-dimensional swing mirror (14) is retracted.

Images