Axial wave band switching device of large-area-array visible light near-infrared imaging sensor

Abstract

The invention provides an axial wave band switching device of a large-area-array visible light near-infrared imaging sensor, and relates to the technical field of airborne photoelectric detection. The device is used for switching between a visible light filtering part and a near-infrared filtering part and comprises a first base, a second base, the visible light filtering part and a near-infrared filtering part, and a first driving mechanism drives the visible light filtering part to rotate and cuts in or cuts out in the axial direction; and the second driving mechanism drives the near-infrared filtering component to rotate and cut in or cut out along the axial direction. According to the invention, the switching of the visible light filtering component and the near-infrared filtering component is controlled, so that the axial wave band switching of the visible light near-infrared imaging sensor is realized.

Description

Technical Field

[0001] The invention relates to the technical field of airborne photoelectric detection, and in particular to an axial band switching device for a large-array visible light near-infrared imaging sensor. Background Art

[0002] The visible light bands of 0.4-0.7μm and the near infrared bands of 0.7-0.9μm are the most common working bands in airborne photoelectric detection systems. The visible light bands of 0.4-0.7μm contain the color information of the scene, and the near infrared bands of 0.7-0.9μm have stronger penetration ability. The imaging characteristics of both are easy for the human eye to recognize. Nowadays, large-array imaging detectors with both visible light and near infrared bands are increasingly used in airborne photoelectric detection systems. In order to obtain images of the above two bands, it is necessary to add a filtering device to the large-array visible light near-infrared imaging sensor. When it is necessary to output the visible light image, the 0.4-0.7μm band filter is cut into the imaging system, and the 0.7-0.9μm filter is cut out. Conversely, a near-infrared image can be obtained.

[0003] At present, the visible light near-infrared band switching design adopts the method of adding a switching mechanism in front of the CCD / CMOS target or in the optical path to achieve two-band switching imaging. This switching method is suitable for use in the lateral direction (perpendicular to the optical axis) with sufficient space and the optical path in a sealed environment, but it is difficult to apply to airborne sensors with high integration, limited lateral space, and harsh working environment. For example, the patent (CN 113985685 A) involves a compact filter switching component, assembly method and application, which uses an arc guide rail, a slider, and a transmission mechanism to achieve filter switching in front of the detector target. This method occupies too much lateral space in front of the detector, and there is an open space between the detector and the rear-end converging mirror, which cannot be sealed. The detector target surface is easily contaminated by the external environment, causing the risk of poor imaging. Domestic related literature focuses on the design of visible light and near-infrared co-aperture, and the rear end uses a prism or a spectroscope to split the light to achieve simultaneous imaging of visible light and near-infrared. This type of method uses two detectors, visible light and near-infrared, and the system is complex and costly.

[0004] Aiming at the special airborne environment and size envelope requirements, the present invention provides an axial band switching device for a large-array visible light near-infrared imaging sensor to solve the problem that the current airborne visible light near-infrared common detector sensor has a large band switching volume and affects sealing. Summary of the invention

[0005] In order to address the deficiencies in the background technology, the present invention provides an axial band switching device for a large-array visible light near-infrared imaging sensor. The device realizes axial band switching of the visible light near-infrared imaging sensor by controlling the switching of a visible light filter component and a near-infrared filter component, thereby solving the problem that the band switching of the current airborne visible light near-infrared common detector sensor is large in size and affects sealing.

[0006] The first object of the present invention is to provide an axial band switching device for a large-array visible light near-infrared imaging sensor, which is used for switching between a visible light filter component and a near-infrared filter component, comprising: A first base and a second base, wherein the first base and the second base are connected to each other; A visible light filtering component is disposed on the first base and is rotatably connected to the first base; A near infrared filter component is disposed on the second base and is rotatably connected to the second base; A first driving mechanism, disposed on the first base, drives the visible light filtering component to rotate and cut in or out along the axial direction; A second driving mechanism is disposed on the second base, driving the near infrared filter component to rotate and cut in or out along the axial direction; The axial direction in which the visible light filter component is cut in or out is the same as the axial direction in which the near infrared filter component is cut in or out.

[0007] Preferably, the first driving mechanism comprises: A first pivot, rotatably disposed on the first base through first bearings sleeved at both ends, and the first pivot is connected to the visible light filtering component through a connecting piece; A first worm gear, which is arranged on a free end formed by extending one end of the first pivot; A first motor is disposed on the first base, wherein a first worm is axially connected to an output shaft of the first motor, and the first worm is meshed with the first worm wheel; When the output shaft of the first motor rotates, the first worm gear is driven to rotate through the first worm, and the first pivot is driven at the same time, thereby driving the visible light filtering component to rotate.

[0008] Preferably, the second driving mechanism comprises: A second pivot, rotatably disposed on the second base through second bearings sleeved at both ends, and the second pivot is connected to the near-infrared filter component through a connecting piece; A second worm gear is disposed on a free end formed by extending one end of the second pivot shaft; a second motor, which is disposed on the second base, wherein a second worm is axially connected to an output shaft of the second motor, and the second worm is meshed with the second worm wheel; When the output shaft of the second motor rotates, the second worm gear is driven to rotate through the second worm, and the second pivot is driven at the same time, thereby driving the near-infrared filter component to rotate.

[0009] Preferably, the axes of the first pivot and the second pivot are perpendicular.

[0010] Preferably, the visible light filter component and the near infrared filter component are designed with the same size, so that the filter centers of the two filter components can be ensured to be at the same position when cutting.

[0011] Preferably, the visible light filter component is a 0.4-0.7 μm band filter; and the near-infrared filter component is a 0.7-0.9 μm band filter.

[0012] The second object of the present invention is to provide a large-array visible light near-infrared imaging sensor, the light input end of which is provided with the above-mentioned axial band switching device.

[0013] Preferably, when the first driving mechanism is controlled to drive the visible light filter component to cut into the light input end, the axis of the visible light filter component and the axis of the light input end are the same axis; Alternatively, the second driving mechanism is controlled to drive the near-infrared filter component to cut into the light input end, and the axis of the near-infrared filter component is the same axis as the axis of the light input end.

[0014] Preferably, the first drive mechanism is controlled to reverse and the second drive mechanism to rotate forward, or the first drive mechanism is controlled to rotate forward and the second drive mechanism is controlled to reverse in sequence, so as to complete the cutting out of the visible light filter component and the cutting in of the near-infrared filter component, or the cutting out of the near-infrared filter component and the cutting in of the visible light filter component, thereby realizing the axial band switching of the visible light near-infrared imaging sensor.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides an axial band switching device for a large-array visible light near-infrared imaging sensor. The present invention is based on a visible light filter component and a near-infrared filter component. By sequentially controlling the first drive mechanism to reverse and the second drive mechanism to rotate forward, or sequentially controlling the first drive mechanism to rotate forward and the second drive mechanism to reverse, the visible light filter component is cut out and the near-infrared filter component is cut in, or the near-infrared filter component is cut out and the visible light filter component is cut in, thereby realizing the axial band switching of the visible light near-infrared imaging sensor. The present invention solves the problem that the current airborne visible light near-infrared common detector sensor has a large band switching volume and affects the sealing. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is the first view of the axial band switching device of the large-array visible light near-infrared imaging sensor.

[0017] Figure 2 This is the second view of the axial band switching device of the large-array visible light near-infrared imaging sensor.

[0018] Figure 3 This is a view of the first drive mechanism.

[0019] Figure 4 is a view of the visible light filtering components.

[0020] Figure 5 This is the rendering of the axial band switching device of the large-array visible light near-infrared imaging sensor. DETAILED DESCRIPTION

[0021] Several specific embodiments of the present invention are described in detail below, but it should be understood that the protection scope of the present invention is not limited by the specific embodiments.

[0022] Aiming at the special airborne environment and size envelope requirements, the present invention provides an axial band switching design for a large-array visible light near-infrared imaging sensor to solve the problem that the current airborne visible light near-infrared common detector sensor has a large band switching volume and affects sealing.

[0023] To achieve the above purpose, see Figures 1 to 5 As shown, the present invention provides an axial band switching device for a large-array visible light near-infrared imaging sensor, which is used for switching between a visible light filtering component and a near-infrared filtering component, and includes: a first base 1 and a second base 1-1, a visible light filtering component 2-2, a near-infrared filtering component 3-2, a first driving mechanism and a second driving mechanism.

[0024] The first base 1 and the second base 1-1 are connected to each other; the visible light filtering component 2-2 is arranged on the first base 1 and is rotatably connected to the first base 1; the near-infrared filtering component 3-2 is arranged on the second base 1-1 and is rotatably connected to the second base 1-1; the first driving mechanism is arranged on the first base 1, driving the visible light filtering component 2-2 to rotate and cut in or out along the axial direction; the second driving mechanism is arranged on the second base 1-1, driving the near-infrared filtering component 3-2 to rotate and cut in or out along the axial direction; the axial direction in which the visible light filtering component 2-2 cuts in or out is the same as the axial direction in which the near-infrared filtering component 3-2 cuts in or out.

[0025] Wherein, the first driving mechanism includes a first pivot, a first worm gear 2-3, and a first motor; The first pivot is rotatably arranged on the first base 1 through first bearings 4 sleeved at both ends, and the first pivot is connected to the visible light filtering component 2-2 through a connecting piece; the first worm gear 2-3 is arranged on a free end formed by extending one end of the first pivot; the first motor is arranged on the first base 1, and the output shaft of the first motor is axially connected with a first worm 2-1, and the first worm 2-1 is meshed with the first worm gear 2-3; To this end, when the output shaft of the first motor rotates, the first worm gear 2-3 is driven to rotate through the first worm 2-1, and the first pivot is driven at the same time, thereby driving the visible light filtering component 2-2 to rotate.

[0026] A second driving mechanism comprises a second pivot, a second worm gear 3-3, and a second motor; The second pivot is rotatably arranged on the second base 1-1 through second bearings 5 ​​sleeved at both ends, and the second pivot is connected to the near-infrared filter component 3-2 through a connecting piece; the second worm gear 3-3 is arranged on a free end formed by extending one end of the second pivot; the second motor is arranged on the second base 1-1, and the second worm 3-1 is axially connected to the output shaft of the second motor, and the second worm 3-1 is meshed with the second worm gear 3-3; To this end, when the output shaft of the second motor rotates, the second worm gear 3-3 is driven to rotate through the second worm 3-1, and the second pivot is driven at the same time, thereby driving the near-infrared filter component 3-2 to rotate.

[0027] In order to facilitate the switching between the visible light filter component and the near infrared filter component, the axes of the first pivot and the second pivot are arranged to be perpendicular.

[0028] Among them, the visible light filter component 2-2 and the near-infrared filter component 3-2 both adopt the same design size, which can ensure that the filter centers of the two filter components are at the same position when cutting.

[0029] The visible light filter component 2-2 is a 0.4-0.7 μm band filter; the near infrared filter component 3-2 is a 0.7-0.9 μm band filter.

[0030] The present invention provides a large-area visible light near-infrared imaging sensor, and the above-mentioned axial band switching device is arranged at the light input end of the large-area visible light near-infrared imaging sensor.

[0031] When the visible light filter component 2-2 is driven to cut into the light input end by controlling the first driving mechanism, the axis of the visible light filter component 2-2 is the same axis as the axis of the light input end; Alternatively, the second driving mechanism is controlled to drive the near infrared filter component 3 - 2 to cut into the light input end, and the axis of the near infrared filter component 3 - 2 is the same axis as the axis of the light input end.

[0032] Specifically, the first driving mechanism is controlled to reverse and the second driving mechanism to rotate forward in sequence, or the first driving mechanism is controlled to rotate forward and the second driving mechanism is controlled to reverse in sequence, so as to complete the cutting out of the visible light filtering component 2-2 and the cutting in of the near-infrared filtering component 3-2, or the cutting out of the near-infrared filtering component 3-2 and the cutting in of the visible light filtering component 2-2, thereby realizing the axial band switching of the visible light near-infrared imaging sensor.

[0033] In order to obtain images in the above two bands, it is necessary to add an axial band switching device to the large-array visible light near-infrared imaging sensor. When it is necessary to output visible light images, the 0.4-0.7μm band filter is cut into the imaging system and the 0.7-0.9μm filter is cut out. Otherwise, a near-infrared image can be obtained.

[0034] In order to further illustrate the band switching device of a large-array visible light near-infrared imaging sensor in an airborne photoelectric detection system provided by the present invention, it is described in conjunction with the accompanying drawings.

[0035] See also Figures 1 to 5 As shown, an axial band switching device for a large-array visible light near-infrared imaging sensor includes a base 1, a base 1-1, a visible light filter component 2-2, a near-infrared filter component 3-2, two motor worm components 2-1, 3-1, two worm wheel components 2-3, 3-3, and two sets of bearing components 4, 5.

[0036] The base 1 and the base 1-1 respectively include a motor worm component installation interface, a rotating mechanism interface and an assembly interface with other systems. The visible light filtering component 2-2, the bearing component 4, and the worm gear component 2-3 form a rotating mechanism, which is installed on a rotating mechanism interface of the base 1. The near-infrared filtering component 3-2, the bearing component 5, and the worm gear component 3-3 form another rotating mechanism, which is installed on a rotating mechanism interface of the base 1-1.

[0037] The motor worm component 2-1 is installed on the base 1 and can form an engagement with the worm wheel component 2-3. The motor worm component 3-1 is installed on the base 1-1 and can form an engagement with the worm wheel component 3-3. When the motor worm component 2-1 rotates forwards and reverses, the visible light filter component 2-2 will cut in and out along the axial direction. Similarly, when the motor worm component 3-1 rotates forwards and reverses, the near-infrared filter component 3-2 will cut in and out along the axial direction.

[0038] The two rotating mechanism interfaces on base 1 and base 1-1 are respectively provided with mechanical limits, so that the visible light filter component or the near-infrared filter component can rotate within a range of 90°. After rotating into position, it is self-locked by the worm gear transmission, ensuring that the axial band switching device has high stability in an airborne environment.

[0039] The visible light filter component 2-2 and the near infrared filter component 3-2 adopt the same design size, and the filter centers of the two filter components can be ensured to be at the same position when cutting.

[0040] The motor worm component 2-1 is controlled to reverse and the motor worm component 3-1 is controlled to rotate forward in sequence to complete the cutting out of the visible light filter component 2-2 and the cutting in of the near-infrared filter component 3-2. Similarly, the motor worm component 3-1 is controlled to reverse and the motor worm component 2-1 is controlled to rotate forward in sequence to complete the cutting out of the near-infrared filter component 3-2 and the cutting in of the visible light filter component 2-2, thereby realizing the axial band switching design of the visible light near-infrared imaging sensor.

[0041] The present invention describes preferred embodiments and their effects. However, those skilled in the art may make additional changes and modifications to these embodiments once they are aware of the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0042] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An axial band switching device for a large-array visible light near-infrared imaging sensor, characterized in that: Used for switching between visible light filter components and near infrared filter components, including: A first base (1) and a second base (1-1), wherein the first base (1) and the second base (1-1) are connected to each other; A visible light filtering component (2-2) is arranged on the first base (1) and is rotatably connected to the first base (1); A near-infrared filter component (3-2) is disposed on the second base (1-1) and is rotatably connected to the second base (1-1); A first driving mechanism, arranged on the first base (1), driving the visible light filtering component (2-2) to rotate and cut in or out along the axial direction; A second driving mechanism, arranged on the second base (1-1), driving the near-infrared filter component (3-2) to rotate and cut in or out along the axial direction; The axial direction in which the visible light filter component (2-2) is cut in or out is the same as the axial direction in which the near infrared filter component (3-2) is cut in or out.

2. The axial band switching device for a large-array visible light near-infrared imaging sensor according to claim 1 is characterized in that: The first driving mechanism comprises: A first pivot, rotatably arranged on the first base (1) via first bearings (4) sleeved at both ends, the first pivot being connected to the visible light filtering component (2-2) via a connecting piece; A first worm gear (2-3) is arranged on a free end formed by extending one end of the first pivot; a first motor, which is arranged on the first base (1); a first worm (2-1) is axially connected to an output shaft of the first motor; the first worm (2-1) is meshed with the first worm wheel (2-3); When the output shaft of the first motor rotates, the first worm gear (2-3) is driven to rotate via the first worm (2-1), and the first pivot is driven at the same time, thereby driving the visible light filtering component (2-2) to rotate.

3. The axial band switching device for a large-array visible light near-infrared imaging sensor according to claim 2 is characterized in that: The second driving mechanism comprises: A second pivot shaft, rotatably disposed on the second base (1-1) via second bearings (5) sleeved at both ends, the second pivot shaft being connected to the near-infrared filter component (3-2) via a connecting piece; A second worm gear (3-3) is arranged on a free end formed by extending one end of the second pivot; a second motor, which is arranged on the second base (1-1), the output shaft of the second motor being axially connected to a second worm (3-1), the second worm (3-1) being meshed with the second worm wheel (3-3); When the output shaft of the second motor rotates, the second worm gear (3-3) is driven to rotate via the second worm (3-1), and the second pivot is driven at the same time, thereby driving the near-infrared filter component (3-2) to rotate.

4. The axial band switching device for a large-array visible light near-infrared imaging sensor according to claim 3 is characterized in that: The axes of the first pivot and the second pivot are perpendicular.

5. The axial band switching device for a large-array visible light near-infrared imaging sensor according to claim 1 is characterized in that: The visible light filter component (2-2) and the near infrared filter component (3-2) both adopt the same design size, and when cutting in, the filter centers of the two filter components can be ensured to be at the same position.

6. The axial band switching device for a large-array visible light near-infrared imaging sensor according to claim 1 is characterized in that: The visible light filter component (2-2) is a 0.4-0.7 μm band filter; the near-infrared filter component (3-2) is a 0.7-0.9 μm band filter.

7. A large-array visible light near-infrared imaging sensor, characterized in that: The light input end of the large-array visible light near-infrared imaging sensor is provided with the axial band switching device described in any one of claims 1 to 6.

8. The large-array visible light near-infrared imaging sensor according to claim 7, characterized in that: When the first driving mechanism is controlled to drive the visible light filtering component (2-2) to cut into the light input end, the axis of the visible light filtering component (2-2) and the axis of the light input end are the same axis; Alternatively, the second driving mechanism is controlled to drive the near-infrared filter component (3-2) to cut into the light input end, and the axis of the near-infrared filter component (3-2) is the same axis as the axis of the light input end.

9. The large-array visible light near-infrared imaging sensor according to claim 8, characterized in that: By sequentially controlling the first drive mechanism to reverse and the second drive mechanism to rotate forward, or sequentially controlling the first drive mechanism to rotate forward and the second drive mechanism to reverse, the visible light filter component (2-2) is cut out and the near infrared filter component (3-2) is cut in, or the near infrared filter component (3-2) is cut out and the visible light filter component (2-2) is cut in, thereby realizing axial band switching of the visible light near infrared imaging sensor.

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