Non-uniformity correction system and method for vehicle-mounted large-aperture optical system

Abstract

The invention relates to the technical field of optical systems, in particular to a non-uniformity correction system and method for a vehicle-mounted large-aperture optical system. The system comprises an optical acquisition unit, a transflective mirror switching unit, a black body and an infrared detection device. The optical acquisition unit is used for acquiring and converging external light rays, the transflective mirror switching unit comprises a transflective mirror and a reflecting mirror which can be switched at the same preset position, the preset position is located on a light path between the optical acquisition unit and the infrared detection device, and the plane where the preset position is located is obliquely crossed with a main optical axis of the light rays acquired by the optical acquisition unit; the black body is arranged at one end facing the reflecting surface when the preset position is the reflector, and the black body fills the entrance pupil of the reflector. The embodiment of the invention provides a non-uniformity correction system and method for a vehicle-mounted large-aperture optical system, which can provide timely and convenient non-uniformity correction.

Description

Technical Field

[0001] The present invention relates to the technical field of optical systems, and in particular to a non-uniformity correction system and method for a vehicle-mounted large-aperture optical system. Background Art

[0002] Infrared image non-uniformity correction can eliminate stripe noise and other types of non-uniform noise caused by the difference in the response of different detectors in the detector array to improve the quality and usability of infrared images. During the long-term use of large-aperture optical systems, the response rate of the detector will gradually change. Regular non-uniformity correction can improve the quality of acquired images.

[0003] Vehicle-mounted large-aperture optical systems usually place a high-precision black body at the entrance pupil of the optical system for calibration. For vehicle-mounted large-aperture optical systems, the required black body is also large in size, which is difficult to manufacture, and it is difficult for the vehicle-mounted system to carry a large-aperture black body. It is difficult to obtain high-quality images in field tests. Summary of the invention

[0004] The embodiments of the present invention provide a non-uniformity correction system and method for a vehicle-mounted large-aperture optical system, which can provide timely and convenient non-uniformity correction.

[0005] In a first aspect, the present invention provides a non-uniformity correction system for a vehicle-mounted large-aperture optical system, comprising an optical collection unit, a transflective mirror switching unit, a black body, and an infrared detection device;

[0006] The optical collection unit is used to collect and gather external light, the transmissive mirror switching unit includes a transmissive mirror and a reflective mirror that can be switched at the same preset position, the preset position is located on the optical path between the optical collection unit and the infrared detection device, the plane where the preset position is located is obliquely intersected with the main optical axis of the light collected by the optical collection unit, the black body is arranged at the end to which the reflective surface faces when the preset position is a reflective mirror, and the black body fills the entrance pupil of the reflective mirror;

[0007] During calibration, the reflector is switched at the preset position, and the light generated by the black body is reflected by the reflector to the infrared detection device. During normal use, the preset position is switched to a transmission mirror, and the infrared detection device receives the light collected by the optical collection system.

[0008] In a possible design, the transmission mirror switching unit further includes a stepping motor and a track, and the stepping motor is used to control the transmission mirror and the reflection mirror on the track to move to the preset position.

[0009] In a second aspect, an embodiment of the present invention further provides a method for correcting non-uniformity of a vehicle-mounted large-aperture optical system. Based on any system in the above embodiments, the method includes:

[0010] Switching the reflector to the preset position;

[0011] Setting the temperature of the black body, and the infrared detection device collecting images at the temperature;

[0012] The integration time of the camera of the infrared detection device is adjusted, and non-uniformity correction is performed at each integration time.

[0013] Compared with the prior art, the present invention has at least the following beneficial effects:

[0014] Compared with the prior art of placing a large-aperture surface source blackbody at the entrance pupil of the optical collection unit for non-uniformity correction, the correction method provided by the invention uses a blackbody with a smaller size and better uniformity; it is easy to operate in actual tests, and non-uniformity correction can be performed at any time according to needs, with a better non-uniformity correction effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] 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 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.

[0016] Figure 1 Schematic diagram of an optical path of a non-uniformity correction system of a vehicle-mounted large-aperture optical system in a normal working state provided by an embodiment of the present invention;

[0017] Figure 2 It is a schematic diagram of an optical path of a non-uniformity correction system of a vehicle-mounted large-aperture optical system in a correction state provided by an embodiment of the present invention.

[0018] In the figure:

[0019] 1- Optical acquisition unit;

[0020] 21- transmission mirror;

[0021] 22-reflector;

[0022] 3- Infrared detection device;

[0023] 4- Bold. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0025] In the description of the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance; unless otherwise specified or explained, the term "multiple" refers to two or more; the terms "connected" and "fixed" should be understood in a broad sense, for example, "connected" can be a fixed connection, a detachable connection, an integral connection, or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] In the description of this specification, it should be understood that the directional words such as "upper" and "lower" described in the embodiments of the present invention are described at the angles shown in the drawings and should not be understood as limiting the embodiments of the present invention. In addition, in the context, it should also be understood that when it is mentioned that an element is connected to another element "upper" or "lower", it can not only be directly connected to another element "upper" or "lower", but also indirectly connected to another element "upper" or "lower" through an intermediate element.

[0027] like Figure 1 and Figure 2 As shown, the present invention provides a non-uniformity correction system for a vehicle-mounted large-aperture optical system, including an optical collection unit, a transflective mirror switching unit, a black body and an infrared detection device;

[0028] The optical collection unit is used to collect and gather external light, the transmissive mirror switching unit includes a transmissive mirror and a reflective mirror that can be switched at the same preset position, the preset position is located on the optical path between the optical collection unit and the infrared detection device, the plane where the preset position is located is obliquely intersected with the main optical axis of the light collected by the optical collection unit, the black body is arranged at the end to which the reflective surface faces when the preset position is a reflective mirror, and the black body fills the entrance pupil of the reflective mirror;

[0029] During calibration, the reflector is switched at the preset position, and the light generated by the black body is reflected by the reflector to the infrared detection device. During normal use, the preset position is switched to a transmission mirror, and the infrared detection device receives the light collected by the optical collection system.

[0030] Compared with the prior art of placing a large-aperture surface source blackbody at the entrance pupil of the optical collection unit for non-uniformity correction, the correction method provided by the invention uses a blackbody with a smaller size and better uniformity; it is easy to operate in actual tests, and non-uniformity correction can be performed at any time according to needs, with a better non-uniformity correction effect.

[0031] In some embodiments of the present invention, the transmissive mirror switching unit further includes a stepping motor and a track, and the stepping motor is used to control the transmissive mirror and the reflective mirror on the track to move to the preset position.

[0032] An embodiment of the present invention further provides a method for correcting non-uniformity of a vehicle-mounted large-aperture optical system. Based on any system in the above embodiments, the method includes:

[0033] Switching the reflector to the preset position;

[0034] Setting the temperature of the black body, and the infrared detection device collecting images at the temperature;

[0035] The integration time of the camera of the infrared detection device is adjusted, and non-uniformity correction is performed at each integration time.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A non-uniformity correction system for a vehicle-mounted large-aperture optical system, characterized in that: It includes an optical collection unit, a transflective mirror switching unit, a black body and an infrared detection device; The optical collection unit is used to collect and gather external light, the transmissive mirror switching unit includes a transmissive mirror and a reflective mirror that can be switched at the same preset position, the preset position is located on the optical path between the optical collection unit and the infrared detection device, the plane where the preset position is located is obliquely intersected with the main optical axis of the light collected by the optical collection unit, the black body is arranged at the end to which the reflective surface faces when the preset position is a reflective mirror, and the black body fills the entrance pupil of the reflective mirror; During calibration, the reflector is switched at the preset position, and the light generated by the black body is reflected by the reflector to the infrared detection device. During normal use, the preset position is switched to a transmission mirror, and the infrared detection device receives the light collected by the optical collection system.

2. The system according to claim 1, characterized in that The transmissive mirror switching unit further includes a stepping motor and a track, wherein the stepping motor is used to control the transmissive mirror and the reflective mirror on the track to move to the preset position.

3. A method for correcting the non-uniformity of a vehicle-mounted large-aperture optical system, characterized in that: Based on the system described in any one of claims 1-2, the method comprises: Switching the reflector to the preset position; Setting the temperature of the black body, and the infrared detection device collecting images at the temperature; The integration time of the camera of the infrared detection device is adjusted, and non-uniformity correction is performed at each integration time.

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