Axial waveband switching device for large array visible near infrared imaging sensor

Abstract

The application provides an axial wave band switching device of a large-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 component and a near-infrared filtering component, and comprises a first base and a second base, the visible light filtering component, a near-infrared filtering part, a first driving mechanism for driving the visible light filtering component to rotate and cut in or cut out along an axial direction, and a second driving mechanism for driving the near-infrared filtering component to rotate and cut in or cut out along an axial direction.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 present application relates to the technical field of airborne photoelectric detection, in particular to an axial waveband switching device of a large-array visible light and near-infrared imaging sensor. BACKGROUND

[0002] Visible light 0.4-0.7 μm and near-infrared 0.7-0.9 μm wavebands are the most common working wavebands in airborne photoelectric detection systems. Visible light 0.4-0.7 μm contains color information of scenes, and the near-infrared 0.7-0.9 μm waveband has stronger penetration capability, and the imaging features of both are easy to identify by the human eye. Nowadays, large-array imaging detectors with both visible light and near-infrared wavebands are increasingly used in airborne photoelectric detection systems. In order to obtain images of the above two wavebands, a light filtering device needs to be added in the large-array visible light and near-infrared imaging sensor, and when a visible light image needs to be output, the 0.4-0.7 μm waveband filter is switched into the imaging system, and the 0.7-0.9 μm filter is switched out, and vice versa to obtain a near-infrared image.

[0003] Currently, visible light and near-infrared waveband switching designs all use switching mechanisms in front of the CCD / CMOS target surface or in the optical path to realize two-waveband switching imaging. This switching method is suitable for use in the transverse direction (perpendicular to the optical axis direction) with sufficient space and under sealed environmental conditions, but it is difficult to apply to airborne sensors with high integration and limited transverse space, and in harsh working environments. For example, patent (CN 113985685 A) relates to a compact filter switching assembly, assembly method and application, which uses an arc-shaped guide rail, a sliding block and a transmission mechanism to realize filter switching in front of the detector target surface. This method occupies too much transverse 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, and the risk of poor imaging is caused. Domestic related literature focuses on the design of a prism or a beam splitter to realize simultaneous imaging of visible light and near-infrared light after the visible light and near-infrared light are co-axial. This type of method uses two detectors for visible light and near-infrared light, which is complex and costly.

[0004] The present application provides an axial waveband switching device of a large-array visible light and near-infrared imaging sensor for airborne special environments and size envelope requirements, to solve the problem of large volume and impact on sealing of current airborne visible light and near-infrared co-detector sensor waveband switching. SUMMARY

[0005] In order to solve the problems in the background art, the application provides an axial wave band switching device of a large-array visible light near-infrared imaging sensor, which realizes the axial wave band switching of the visible light near-infrared imaging sensor by controlling the switching of a visible light filtering component and a near-infrared filtering component, and solves the problems of large volume and influence on sealing of the current airborne visible light near-infrared common detector sensor wave band switching.

[0006] The first object of the application is to provide an axial wave band switching device of 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 comprises:

[0007] A first base and a second base, which are connected to each other;

[0008] A visible light filtering component, which is arranged on the first base and is rotationally connected to the first base;

[0009] A near-infrared filtering component, which is arranged on the second base and is rotationally connected to the second base;

[0010] A first driving mechanism, which is arranged on the first base and drives the visible light filtering component to rotate and cut in or cut out along an axial direction;

[0011] A second driving mechanism, which is arranged on the second base and drives the near-infrared filtering component to rotate and cut in or cut out along an axial direction;

[0012] The axial direction in which the visible light filtering component cuts in or cuts out is the same as the axial direction in which the near-infrared filtering component cuts in or cuts out.

[0013] Preferably, the first driving mechanism comprises:

[0014] A first pivot, which is rotationally arranged on the first base through first bearings arranged on both ends of the first pivot, and is connected to the visible light filtering component through a connecting piece arranged on the first pivot;

[0015] A first worm gear, which is arranged on a free end formed by extension of one end of the first pivot;

[0016] A first motor, which is arranged on the first base, and has a first worm shaft connected thereto in an axial direction, the first worm shaft being engaged with the first worm gear;

[0017] When the output shaft of the first motor rotates, the first worm shaft drives the first worm gear to rotate, and the first pivot is driven to rotate, so that the visible light filtering component is driven to rotate.

[0018] Preferably, the second driving mechanism comprises:

[0019] A second pivot is rotatably arranged on the second base through a second bearing sleeved on both ends, and the second pivot is connected with the near-infrared filter component through a connecting piece;

[0020] A second worm wheel is arranged on the free end extended from one end of the second pivot;

[0021] A second motor is arranged on the second base, and a second worm is axially connected to an output shaft of the second motor, and the second worm is engaged with the second worm wheel;

[0022] When the output shaft of the second motor rotates, the second worm wheel is driven to rotate through the second worm, and the second pivot is driven to rotate, so that the near-infrared filter component is driven to rotate.

[0023] Preferably, the first pivot and the second pivot are perpendicular to the axes.

[0024] Preferably, the visible light filter component and the near-infrared filter component have the same design size, and when cut in, the centers of the filter pieces of the two filter components are guaranteed to be at the same position.

[0025] Preferably, the visible light filter component is a 0.4-0.7 μm waveband filter piece, and the near-infrared filter component is a 0.7-0.9 μm waveband filter piece.

[0026] The second object of the application is to provide a large-area visible light and near-infrared imaging sensor, and the light input end of the large-area visible light and near-infrared imaging sensor is provided with the above-mentioned axial waveband switching device.

[0027] Preferably, when the visible light filter component is cut in to the light input end by controlling the first driving mechanism, the axis of the visible light filter component and the axis of the light input end are the same axis.

[0028] Or when the near-infrared filter component is cut in to the light input end by controlling the second driving mechanism, the axis of the near-infrared filter component and the axis of the light input end are the same axis.

[0029] Preferably, the first driving mechanism is controlled to reverse, the second driving mechanism is controlled to rotate forward, or the first driving mechanism is controlled to rotate forward, and the second driving mechanism is controlled to reverse, so that 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 axial waveband switching of the visible light and near-infrared imaging sensor.

[0030] Compared with the prior art, the application has the following advantages:

[0031] The application provides a large-array visible light near-infrared imaging sensor axial waveband switching device. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 Fig. 1 is a first view of the large-array visible light near-infrared imaging sensor axial waveband switching device.

[0033] Figure 2 Fig. 2 is a second view of the large-array visible light near-infrared imaging sensor axial waveband switching device.

[0034] Figure 3 Fig. 3 is a first driving mechanism view.

[0035] Figure 4 Fig. 4 is a visible light filter component view.

[0036] Figure 5 Fig. 5 is an effect diagram of the large-array visible light near-infrared imaging sensor axial waveband switching device. DETAILED DESCRIPTION

[0037] The following detailed description of several specific embodiments of the application is provided, but it should be understood that the protection scope of the application is not limited by the specific embodiments.

[0038] The application provides a large-array visible light near-infrared imaging sensor axial waveband switching device for solving the problems of large volume and affecting sealing of current airborne visible light near-infrared common detector sensor waveband switching.

[0039] In order to achieve the above-mentioned purpose, referring to Figures 1-5 The application provides a large-array visible light near-infrared imaging sensor axial waveband switching device for switching between a visible light filter component and a near-infrared filter component, comprising a first base 1 and a second base 1-1, a visible light filter component 2-2, a near-infrared filter component 3-2, a first driving mechanism and a second driving mechanism.

[0040] 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 rotationally connected to the first base 1; the near-infrared filtering component 3-2 is arranged on the second base 1-1 and is rotationally connected to the second base 1-1; the first driving mechanism is arranged on the first base 1 and drives the visible light filtering component 2-2 to rotate and cut in or cut out in the axial direction; the second driving mechanism is arranged on the second base 1-1 and drives the near-infrared filtering component 3-2 to rotate and cut in or cut out in the axial direction; the axial direction in which the visible light filtering component 2-2 cuts in or cuts out is the same as the axial direction in which the near-infrared filtering component 3-2 cuts in or cuts out.

[0041] The first driving mechanism comprises a first pivot, a first worm gear 2-3 and a first motor.

[0042] The first pivot is rotationally arranged on the first base 1 through the first bearings 4 sleeved on both ends of the first pivot, 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 the free end formed by the extension of 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 the first worm 2-1, and the first worm 2-1 is engaged with the first worm gear 2-3.

[0043] Therefore, when the output shaft of the first motor rotates, the first worm 2-1 drives the first worm gear 2-3 to rotate, and at the same time drives the first pivot, thereby driving the visible light filtering component 2-2 to rotate.

[0044] The second driving mechanism comprises a second pivot, a second worm gear 3-3 and a second motor.

[0045] The second pivot is rotationally arranged on the second base 1-1 through the second bearings 5 sleeved on both ends of the second pivot, and the second pivot is connected to the near-infrared filtering component 3-2 through a connecting piece; the second worm gear 3-3 is arranged on the free end formed by the extension of one end of the second pivot; the second motor is arranged on the second base 1-1, and the output shaft of the second motor is axially connected with the second worm 3-1, and the second worm 3-1 is engaged with the second worm gear 3-3.

[0046] Therefore, when the output shaft of the second motor rotates, the second worm 3-1 drives the second worm gear 3-3 to rotate, and at the same time drives the second pivot, thereby driving the near-infrared filtering component 3-2 to rotate.

[0047] In order to facilitate the switching between the visible light filtering component and the near-infrared filtering component, the axes of the first pivot and the second pivot are perpendicular.

[0048] The visible light filtering component 2-2 and the near-infrared filtering component 3-2 are designed with the same size, and when cut in, the centers of the two filtering components can be ensured to be at the same position.

[0049] The visible light filtering component 2-2 is a 0.4-0.7 μm band filter; and the near-infrared filtering component 3-2 is a 0.7-0.9 μm band filter.

[0050] The present application provides a large array visible light and near-infrared imaging sensor, and the light input end of the large array visible light and near-infrared imaging sensor is provided with the above axial band switching device.

[0051] When the visible light filtering component 2-2 is driven to cut into the light input end by controlling the first driving mechanism, the axis of the visible light filtering component 2-2 and the axis of the light input end are the same axis.

[0052] Or the near-infrared filtering component 3-2 is driven to cut into the light input end by controlling the second driving mechanism, and the axis of the near-infrared filtering component 3-2 and the axis of the light input end are the same axis.

[0053] Specifically, the first driving mechanism is controlled to reverse and the second driving mechanism is controlled to rotate forward, or the first driving mechanism is controlled to rotate forward and the second driving mechanism is controlled to reverse, then the visible light filtering component 2-2 is cut out and the near-infrared filtering component 3-2 is cut in, or the near-infrared filtering component 3-2 is cut out and the visible light filtering component 2-2 is cut in, thereby realizing the axial band switching of the visible light and near-infrared imaging sensor.

[0054] In order to obtain the images of the above two bands, the axial band switching device needs to be added in the large array visible light and near-infrared imaging sensor, and when the visible light image needs to be output, the 0.4-0.7 μm band filter is cut into the imaging system and the 0.7-0.9 μm filter is cut out, and vice versa, thereby obtaining the near-infrared image.

[0055] In order to further illustrate the large array visible light and near-infrared imaging sensor band switching device in the airborne photoelectric detection system provided by the present application, the device is described in combination with the drawings.

[0056] Referring to Figures 1-5 As shown in the drawings, the axial band switching device of the large array visible light and near-infrared imaging sensor comprises a base 1, a base 1-1, a visible light filtering component 2-2, a near-infrared filtering component 3-2, two motor worm components 2-1 and 3-1, two worm components 2-3 and 3-3, and two bearing components 4 and 5.

[0057] The base 1 and the base 1-1 each comprise a motor worm component mounting interface, a rotating mechanism interface and an interface for assembling with other systems, the visible light filtering component 2-2, the bearing component 4 and the worm component 2-3 form a rotating mechanism and are mounted on a rotating mechanism interface of the base 1, and the near-infrared filtering component 3-2, the bearing component 5 and the worm component 3-3 form another rotating mechanism and are mounted on a rotating mechanism interface of the base 1-1.

[0058] The motor worm part 2-1 is installed on the base 1 to form engagement with the worm part 2-3, the motor worm part 3-1 is installed on the base 1-1 to form engagement with the worm part 3-3, and when the motor worm part 2-1 is reversed, the visible light filtering part 2-2 will cut in and cut out along the axial direction, and similarly, when the motor worm part 3-1 is reversed, the near-infrared filtering part 3-2 will cut in and cut out along the axial direction.

[0059] The two rotating mechanism interfaces on the base 1 and the base 1-1 are respectively left with mechanical limits, so that the rotating range of the visible light filtering part or the near-infrared filtering part is 90°, and after rotation, the worm and gear transmission is self-locked, which ensures that the axial wave band switching device has high stability in the on-board environment.

[0060] The visible light filtering part 2-2 and the near-infrared filtering part 3-2 adopt the same design size, and when cutting in, the centers of the filters of the two filtering parts can be ensured to be at the same position.

[0061] In order, the visible light filtering part 2-2 is cut out and the near-infrared filtering part 3-2 is cut in by controlling the motor worm part 2-1 to be reversed and the motor worm part 3-1 to be forward rotated, and similarly, the near-infrared filtering part 3-2 is cut out and the visible light filtering part 2-2 is cut in by controlling the motor worm part 3-1 to be reversed and the motor worm part 2-1 to be forward rotated, so that the visible light and near-infrared imaging sensor axial wave band switching design is realized.

[0062] The preferred embodiments and their effects are described. However, those skilled in the art can make further changes and modifications to the embodiments once they know the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present application.

[0063] Although the embodiments of the present application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made thereto without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A large array visible near infrared imaging sensor axial band switching device, characterized in that, The device is arranged at the light input end of a large-area array visible light near-infrared imaging sensor, and is used for switching between a visible light filtering component and a near-infrared filtering component, comprising: a first base (1) and a second base (1-1), the first base (1) and the second base (1-1) are connected to each other; a visible light filtering component (2-2) arranged on the first base (1) and rotatably connected to the first base (1); a near-infrared filtering component (3-2) arranged on the second base (1-1) and rotatably connected to the second base (1-1); a first driving mechanism arranged on the first base (1) and driving the visible light filtering component (2-2) to rotate and cut in or cut out in the axial direction; a second driving mechanism arranged on the second base (1-1) and driving the near-infrared filtering component (3-2) to rotate and cut in or cut out in the axial direction; the axial direction of the visible light filtering component (2-2) cutting in or cutting out is the same as the axial direction of the near-infrared filtering component (3-2) cutting in or cutting out; wherein the axial direction of the visible light filtering component (2-2) cutting in is the optical axis axial direction after the visible light filtering component (2-2) cuts in to the light input end; the axial direction of the near-infrared filtering component (3-2) cutting in is the optical axis axial direction after the near-infrared filtering component (3-2) cuts in to the light input end; the first driving mechanism comprises: a first pivot rotatably arranged on the first base (1) through a first bearing (4) sleeved on both ends of the first pivot, and the first pivot is connected to the visible light filtering component (2-2) through a connecting piece; a first worm wheel (2-3) arranged on a free end formed by extension on one end of the first pivot; a first motor arranged on the first base (1), and a first worm (2-1) is axially connected to an output shaft of the first motor, and the first worm (2-1) is engaged with the first worm wheel (2-3); when the output shaft of the first motor rotates, the first worm (2-1) drives the first worm wheel (2-3) to rotate, and at the same time drives the first pivot, so as to drive the visible light filtering component (2-2) to rotate; the second driving mechanism comprises: a second pivot rotatably arranged on the second base (1-1) through a second bearing (5) sleeved on both ends of the second pivot, and the second pivot is connected to the near-infrared filtering component (3-2) through a connecting piece; a second worm wheel (3-3) arranged on a free end formed by extension on one end of the second pivot; a second motor arranged on the second base (1-1), and a second worm (3-1) is axially connected to an output shaft of the second motor, and the second worm (3-1) is engaged with the second worm wheel (3-3); when the output shaft of the second motor rotates, the second worm (3-1) drives the second worm wheel (3-3) to rotate, and at the same time drives the second pivot, so as to drive the near-infrared filtering component (3-2) to rotate; the axis of the first pivot is perpendicular to the axis of the second pivot.

2. The large array visible near infrared imaging sensor axial band switching device of claim 1, wherein, The visible light filtering component (2-2) and the near-infrared filtering component (3-2) have the same design size, and the centers of the filters of the two filtering components can be ensured to be at the same position when being cut in.

3. The large array visible near infrared imaging sensor axial band switching device of claim 1, wherein, The visible light filtering component (2-2) is a 0.4-0.7 μm band filter, and the near-infrared filtering component (3-2) is a 0.7-0.9 μm band filter.

4. A large area array visible light near infrared imaging sensor characterized by, The light input end of the large-array visible light and near-infrared imaging sensor is provided with the axial band switching device according to any one of claims 1-3.

5. The large area array visible light near infrared imaging sensor of claim 4, wherein, When the visible light filtering component (2-2) is cut in by controlling the first driving mechanism, the axis of the visible light filtering component (2-2) and the axis of the light input end are the same axis. Or when the near-infrared filtering component (3-2) is cut in by controlling the second driving mechanism, the axis of the near-infrared filtering component (3-2) and the axis of the light input end are the same axis.

6. The large area array visible light near infrared imaging sensor of claim 5, wherein, In sequence, the first driving mechanism is controlled to reverse, and the second driving mechanism is controlled to rotate forward, or the first driving mechanism is controlled to rotate forward, and the second driving mechanism is controlled to reverse, then the visible light filtering component (2-2) is cut out, and the near-infrared filtering component (3-2) is cut in, or the near-infrared filtering component (3-2) is cut out, and the visible light filtering component (2-2) is cut in, the axial band switching of the visible light and near-infrared imaging sensor is realized.

Images