Photoelectric pod optical axis stability control device based on MEMS fast reflecting mirror

Abstract

The invention relates to the technical field of photoelectric pod optics, in particular to a photoelectric pod optical axis stability control device based on an MEMS fast reflecting mirror. Comprising a refraction window, an RC module, a light splitting module, a visible light imaging optical module and an infrared light imaging module. The refraction window is used for primarily transmitting and refracting incoming and outgoing light; the RC module is used for collecting and primarily focusing light and reflecting the focused light; the light splitting module is used for splitting light into two wavebands, namely visible light and infrared light, and reflecting and transmitting the light of the two wavebands; the visible light imaging optical module is used for receiving visible light and focusing and imaging the visible light; the infrared light imaging module is used for receiving visible infrared light and focusing and imaging the visible infrared light; through the above structure, image motion compensation can be carried out by using the fast reflecting mirror in small and medium photoelectric pod optical systems, and the imaging quality of a photoelectric pod is improved.

Description

Technical Field

[0001] The invention relates to the field of optical technology of an optoelectronic pod, and in particular to an optical axis stabilization control device of an optoelectronic pod based on a MEMS fast-reflecting mirror. Background Art

[0002] In recent years, the aerial photoelectric imaging system mainly adopts the design form of multi-band telephoto reflective optical system, which has the characteristics of strong timeliness, high accuracy, long reconnaissance distance, and flexible maneuverability. In the imaging process of the aerial photoelectric system, due to factors such as the movement of the object relative to the optical system or the mechanical vibration of the carrier, the target image point moves in the image plane, resulting in blur and smearing effects, resulting in a serious degradation of image quality. In order to obtain a clear image of a moving target, the optical system must use image motion compensation technology to improve the imaging quality. The essence of image motion compensation for optical system imaging is to stabilize the image of the target at the same position on the detector target surface during the camera exposure time. Most of the current aerial cameras use motion compensation optical elements added to the optical system for image motion compensation. Motion compensation optical elements are added to the optical system, and currently the main high-precision image motion compensation technology based on fast-adjusting reflectors is used. Since the fast-adjusting mirror only produces a folding and deflecting effect on the optical path, it does not affect the optical imaging aberration. In addition, the fast-adjusting mirror is small in size and light in weight, and its motion control accuracy is high, which can reach the micro-arc level. Therefore, adding a fast-adjusting mirror to the optical system for image shift compensation has significant advantages. By accurately controlling the angle pointing of the fast-adjusting mirror, the target can be stably imaged at the same position on the target surface during the camera exposure time, thereby achieving clear imaging of the target.

[0003] At present, phase shift compensation in optoelectronic pods is mainly used in parallel optical paths. Although image shift compensation does not cause additional aberrations when the fast-adjusting reflector is placed in the parallel optical path, when the magnification of the optical system is large, the aperture of the fast-adjusting reflector increases sharply, and a large-diameter fast-adjusting reflector is required to achieve this. A large-diameter fast-reflecting mirror not only increases its transmission inertia and reduces transmission efficiency, making it impossible to achieve high-bandwidth fast response functions, but also makes it impossible to use fast-reflecting mirrors for image shift compensation in small and medium-sized optoelectronic pod optical systems due to the large diameter of the fast-reflecting mirror.

[0004] In summary, it is very necessary to propose an optoelectronic pod optical axis stabilization control device that can use a fast reflection mirror in the optical system of a small and medium-sized optoelectronic pod to perform image motion compensation and improve the imaging quality of the optoelectronic pod. Summary of the invention

[0005] The purpose of the present invention is to provide an optical axis stabilization control device for an optoelectronic pod based on a MEMS fast-reflection mirror, which enables the use of fast-reflection mirrors in small and medium-sized optoelectronic pod optical systems for image motion compensation, thereby improving the imaging quality of the optoelectronic pod.

[0006] To achieve the above-mentioned purpose, the present invention adopts an optical axis stabilization control device of an optoelectronic pod based on a MEMS fast reflection mirror, comprising a refraction window, an RC module, a spectroscopic module, a visible light imaging optical module and an infrared light imaging module, wherein the RC module is arranged on one side of the refraction window, the spectroscopic module is arranged on one side of the RC module, and the visible light imaging optical module and the infrared light imaging module are respectively arranged on both sides of the spectroscopic module;

[0007] The refraction window is used for preliminary transmission and refraction of light entering and exiting;

[0008] The RC module is responsible for collecting and initially focusing the light, and reflecting the focused light;

[0009] The light splitting module is used to split the light into two bands, namely visible light and infrared light, and to reflect and transmit the light of the two bands;

[0010] The visible light imaging optical module is used to receive visible light and perform focusing imaging on the visible light;

[0011] The infrared light imaging module is used to receive visible infrared light and perform focused imaging on the visible infrared light.

[0012] The RC module includes a first primary mirror, a second primary mirror and a secondary mirror, the first primary mirror and the second primary mirror are respectively arranged on one side of the refractive window, and the secondary mirror is arranged between the first primary mirror and the second primary mirror.

[0013] The spectroscopic module comprises a spectroscope, a first MEMS fast reflection mirror and a second MEMS fast reflection mirror. The spectroscope is arranged on one side of the secondary mirror, and the first MEMS fast reflection mirror and the second MEMS fast reflection mirror are respectively arranged on the outside of the spectroscope.

[0014] Among them, the visible light imaging optical module includes a first focusing lens, a second focusing lens and a third focusing lens, the first focusing lens is arranged on one side of the first MEMS fast reflection mirror, the second focusing lens is arranged on one side of the first focusing lens, and the third focusing lens is arranged on one side of the second focusing lens.

[0015] Wherein, the infrared light imaging module is an infrared focusing lens.

[0016] The present invention discloses an optical axis stabilization control device for an optoelectronic pod based on a MEMS fast-reflection mirror. The refraction window is used for preliminary transmission and refraction of light entering and exiting. The RC module is responsible for collecting and preliminarily focusing the light, and reflecting the focused light. The spectroscopic module is used for dividing the light into two bands, namely, visible light and infrared light, and reflecting and transmitting the light of the two bands. The visible light imaging optical module is used for receiving visible light and focusing and imaging the visible light. The infrared light imaging module is used for receiving visible infrared light and focusing and imaging the visible infrared light. The fast-reflection mirror can be used in the optical system of a small or medium-sized optoelectronic pod to perform image shift compensation, thereby improving the imaging quality of the optoelectronic pod. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0018] Figure 1 It is a structural schematic diagram of the optical axis stabilization control device of the optoelectronic pod based on the MEMS fast reflection mirror of the present invention.

[0019] Figure 2 It is a schematic diagram of the convergent light path of the optoelectronic pod optical axis stabilization control device based on the MEMS fast reflection mirror of the present invention.

[0020] 11 - refraction window, 21 - first primary mirror, 22 - second primary mirror, 23 - secondary mirror, 31 - beam splitter, 32 - first MEMS fast reflection mirror, 33 - second MEMS fast reflection mirror, 41 - first focusing lens, 42 - second focusing lens, 43 - third focusing lens, 51 - infrared focusing lens. DETAILED DESCRIPTION

[0021] See also Figure 1 and Figure 2 ,in Figure 1 This is a schematic diagram of the structure of the optical axis stabilization control device of the optoelectronic pod based on the MEMS fast-reflection mirror. Figure 2 It is a schematic diagram of the convergent light path of the optoelectronic pod optical axis stabilization control device based on the MEMS fast reflection mirror.

[0022] The present invention provides an optical axis stabilization control device for an optoelectronic pod based on a MEMS fast-reflection mirror, comprising a refraction window 11, an RC module, a spectroscopic module, a visible light imaging optical module, and an infrared light imaging module, wherein the RC module is arranged on one side of the refraction window 11, the spectroscopic module is arranged on one side of the RC module, and the visible light imaging optical module and the infrared light imaging module are arranged on both sides of the spectroscopic module respectively;

[0023] The refraction window 11 is used for preliminary transmission and refraction of light entering and exiting;

[0024] The RC module is responsible for collecting and initially focusing the light, and reflecting the focused light;

[0025] The light splitting module is used to split the light into two bands, namely visible light and infrared light, and to reflect and transmit the light of the two bands;

[0026] The visible light imaging optical module is used to receive visible light and perform focusing imaging on the visible light;

[0027] The infrared light imaging module is used to receive visible infrared light and perform focused imaging on the visible infrared light.

[0028] In this embodiment, the refraction window 11 is used for preliminary transmission and refraction of light in and out; the RC module is responsible for collecting and preliminarily focusing the light, and reflecting the focused light; the spectroscopic module is used to divide the light into two bands, visible light and infrared light, and reflect and transmit the light of the two bands; the visible light imaging optical module is used to receive visible light and focus the visible light for imaging; the infrared light imaging module is used to receive visible infrared light and focus the visible infrared light for imaging; it is realized that the fast reflection mirror can be used in the optical system of small and medium-sized optoelectronic pods to compensate for image shift, thereby improving the imaging quality of the optoelectronic pod.

[0029] Furthermore, the RC module includes a first main mirror 21, a second main mirror 22 and a beam splitter 3123, wherein the first main mirror 21 and the second main mirror 22 are respectively arranged on one side of the refractive window 11, and the beam splitter 3123 is arranged between the first main mirror 21 and the second main mirror 22.

[0030] In this embodiment, the refraction window 11 is a spliced ​​window composed of two transparent windows, which is located at the outermost layer of the electro-optical pod optical axis stabilization control device based on MEMS fast mirror, which can not only protect the internal optical devices from the influence of the external environment, but also perform preliminary transmission or refraction of the light entering the electro-optical pod optical axis stabilization control device based on MEMS fast mirror to maintain the stability of the optical path. The first main mirror 21 and the second main mirror 22 are responsible for collecting and preliminarily focusing the light from the outside world, and the beam splitter 3123 further reflects the focused light and the beam splitter module. The RC module eliminates spherical aberration and coma through optimized design, thereby obtaining higher optical imaging quality. The optical parameters of the RC module can be adjusted through aberration theory to improve imaging accuracy.

[0031] Furthermore, the spectroscopic module includes a spectroscope, a first MEMS fast mirror 32 and a second MEMS fast mirror 33. The spectroscope is arranged on one side of the spectroscope 3123, and the first MEMS fast mirror 32 and the second MEMS fast mirror 33 are respectively arranged on the outside of the spectroscope.

[0032] In this embodiment, the function of the spectroscope is to split the light from the RC module into two different bands, namely visible light and infrared light, and to guide the visible light to the visible light imaging optical module through reflection or transmission, while the infrared light enters the infrared light imaging module; the function of the first MEMS fast mirror 32 and the second MEMS fast mirror 33 is to reduce image shift through rapid deflection, eliminate optical interference or light loss that may exist in traditional spectrometry, and improve the imaging quality and light energy utilization efficiency of the entire device.

[0033] Furthermore, the visible light imaging optical module includes a first focusing lens 41, a second focusing lens 42 and a third focusing lens 43, the first focusing lens 41 is arranged on one side of the first MEMS fast reflection mirror 32, the second focusing lens 42 is arranged on one side of the first focusing lens 41, and the third focusing lens 43 is arranged on one side of the second focusing lens 42.

[0034] In this embodiment, the first focusing lens 41, the second focusing lens 42 and the third focusing lens 43 are used to focus and image the visible light transmitted from the spectroscopic module, and to adjust the optical parameters of each lens to eliminate chromatic aberration, thereby optimizing the imaging quality of the visible light. The focal length can also be adjusted as needed to reduce cold reflection.

[0035] Furthermore, the infrared light imaging module is an infrared focusing lens 51 .

[0036] In this embodiment, the infrared focusing lens 51 focuses and images the infrared light transmitted from the light splitting module, and adjusts the lens to eliminate the chromatic aberration of the infrared light during transmission, thereby ensuring the accuracy of infrared imaging.

[0037] In the present invention, if Figure 2 As shown, the device places the MEMS fast reflector in the convergent optical path of the optoelectronic pod optical system. When the magnification of the optical system is large, the aperture of the fast-adjustable reflector changes less, which is conducive to motion control. When the fast-adjustable reflector is placed in the convergent optical path, the image plane will tilt after motion compensation, and the main aberration is defocus aberration; when the motion compensation reflector rotates with the motion, image motion compensation is achieved, but the image plane tilts at the same time.

[0038] The aberration caused by the tilt of the image plane can be expressed by the defocus aberration. Through the numerical derivation of Matlab, the defocus value △h should satisfy the following relationship:

[0039]

[0040] Where: Δh is the image plane defocus; f is the equivalent focal length of the front optical system; L is the back intercept of the reflector; θ is the object side incident beam angle; α is the rotation angle of the image shift compensation reflector.

[0041] What is disclosed above is only one or more preferred embodiments of the present invention, which certainly cannot be used to limit the scope of rights of the present invention. Ordinary technicians in this field can understand that all or part of the processes of implementing the above embodiments and making equivalent changes according to the claims of the present invention still fall within the scope of the invention.

Claims

1. An optical axis stabilization control device for an optoelectronic pod based on a MEMS fast-reflecting mirror, characterized in that: It includes a refraction window, an RC module, a spectroscopic module, a visible light imaging optical module and an infrared light imaging module, wherein the RC module is arranged on one side of the refraction window, the spectroscopic module is arranged on one side of the RC module, and the visible light imaging optical module and the infrared light imaging module are arranged on both sides of the spectroscopic module respectively; The refraction window is used for preliminary transmission and refraction of light entering and exiting; The RC module is responsible for collecting and initially focusing the light, and reflecting the focused light; The light splitting module is used to split the light into two bands, namely visible light and infrared light, and to reflect and transmit the light of the two bands; The visible light imaging optical module is used to receive visible light and perform focusing imaging on the visible light; The infrared light imaging module is used to receive visible infrared light and perform focused imaging on the visible infrared light.

2. The optical axis stabilization control device of the optoelectronic pod based on the MEMS fast-reflection mirror according to claim 1, characterized in that: The RC module includes a first primary mirror, a second primary mirror and a secondary mirror. The first primary mirror and the second primary mirror are respectively arranged on one side of the refraction window, and the secondary mirror is arranged between the first primary mirror and the second primary mirror.

3. The optical axis stabilization control device of the optoelectronic pod based on the MEMS fast reflection mirror as claimed in claim 2, characterized in that: The spectroscopic module comprises a spectroscope, a first MEMS fast reflection mirror and a second MEMS fast reflection mirror. The spectroscope is arranged at one side of the secondary mirror, and the first MEMS fast reflection mirror and the second MEMS fast reflection mirror are respectively arranged at the outer sides of the spectroscope.

4. The optical axis stabilization control device of the optoelectronic pod based on the MEMS fast reflection mirror as claimed in claim 3 is characterized in that: The visible light imaging optical module includes a first focusing lens, a second focusing lens and a third focusing lens. The first focusing lens is arranged on one side of the first MEMS fast reflection mirror, the second focusing lens is arranged on one side of the first focusing lens, and the third focusing lens is arranged on one side of the second focusing lens.

5. The optical axis stabilization control device of the optoelectronic pod based on the MEMS fast reflection mirror according to claim 1, characterized in that: The infrared light imaging module is an infrared focusing lens.

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