A hyperspectral imaging device

Abstract

The application relates to the technical field of spectral imaging, in particular to a hyperspectral imaging device which comprises a lens, a shell, a movable lens seat, a swing mirror mechanism and a spectrometer arranged in the inner cavity of the shell; the lens penetrates through the first side wall of the shell and is connected to one end of the movable lens seat; the movable lens seat is arranged in parallel with the first side wall of the shell; the swing mirror mechanism is in contact with the movable lens seat, so that the movable lens seat is driven to move when the swing mirror mechanism rotates, thereby adjusting the distance between the movable lens seat and the first side wall of the shell; the spectrometer is arranged beside the swing mirror mechanism, so that the light entering the lens is reflected by the swing mirror mechanism and then enters the spectrometer. By arranging the integrated swing mirror mechanism, the volume and weight are effectively reduced, and the swing scanning type spectrometer is miniaturized and lightened.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of spectral imaging technology, in particular to a hyperspectral imaging device. BACKGROUND

[0002] The scanning mode of the spectral imager includes a slit scanning mode and a rotating mirror scanning mode. The commonly used swing scanning structure is that the hyperspectral imaging device and the lens are rotated as a whole for swing scanning, or the slit is pushed relative to the lens. This makes the overall mechanical structure required for swing scanning larger, and the volume and weight increase. In occasions where the weight and space requirements are strict, the traditional swing scanning scheme cannot meet the use requirements. In addition, the swing scanning structure using a reflecting mirror to rotate between the slit and the lens is beneficial to reducing the structure volume and weight to meet the actual use requirements, but this structure has a large difference between the edge and center image distance, has a virtual focus problem, is not conducive to obtaining high-definition images, often requires an additional focusing system, and is not conducive to the overall miniaturization and lightweight design.

[0003] It should be noted that the information disclosed in the above background section is only used to strengthen the understanding of the background of the present disclosure, and therefore can include information that does not constitute prior art known to those of ordinary skill in the art. SUMMARY

[0004] The present application provides a hyperspectral imaging device, which can realize the miniaturization and lightweight of the device and effectively overcome the defects in the prior art.

[0005] Other characteristics and advantages of the present application will become apparent from the following detailed description, or will be learned by practice of the present disclosure.

[0006] According to one aspect of the present application, a hyperspectral imaging device is provided, which includes a lens, a housing, and a movable mirror seat, a swing mirror mechanism, and a spectrometer arranged in the inner cavity of the housing.

[0007] The lens penetrates through the first side wall of the housing and is connected to the movable mirror seat at one end; the movable mirror seat is arranged in parallel with the first side wall of the housing.

[0008] The swing mirror mechanism is in contact with the movable mirror seat, so as to drive the movable mirror seat to move when the swing mirror mechanism rotates to adjust the distance between the movable mirror seat and the first side wall of the housing.

[0009] The spectrometer is arranged beside the swing mirror mechanism, so that the light entering the lens is reflected by the swing mirror mechanism and then enters the spectrometer.

[0010] In some example embodiments, the swing mirror mechanism comprises a swing mirror motor, a focusing turntable, and a swing mirror; the swing mirror motor is arranged at the bottom of the focusing turntable and is used to drive the focusing turntable; the swing mirror is arranged on the focusing turntable and rotates with the focusing turntable, and is used to reflect the light entering the lens into the spectrometer; and the focusing turntable is in contact with the movable lens seat.

[0011] In some example embodiments, the focusing turntable is an elliptical structure.

[0012] In some example embodiments, limit posts are symmetrically arranged on both sides of the movable lens seat, and through holes matched with the limit posts are arranged on the first side wall of the shell.

[0013] In some example embodiments, springs are sleeved on the limit posts.

[0014] In some example embodiments, the movable lens seat comprises two sub-lens seats symmetrically arranged on both sides of the lens, and a connecting plate used to connect the two sub-lens seats, and the connecting plate is in contact with the swing mirror mechanism.

[0015] In some example embodiments, limit blocks are arranged at both ends of the connecting plate, and limit grooves used to mount the limit blocks are arranged on the sub-lens seat.

[0016] In some example embodiments, gaps are arranged between the limit grooves and the limit blocks.

[0017] The hyperspectral imaging device provided by the embodiment of the present application comprises a swing mirror mechanism arranged at the rear end of the lens in the shell and in contact with the movable lens seat, so that the swing mirror mechanism can drive the movable lens seat to move when the swing mirror mechanism rotates, the image information of the target object is reflected by the swing mirror after passing through the lens, and the image distance of the imaging spectrometer is changed, so that the focusing effect is achieved. The mechanical structure is designed to adjust the focal length, so that the problem of long focusing time caused by software focusing is avoided, and the scanning speed of the swing scanning spectrometer is ensured. The integrated swing mirror mechanism is arranged, the volume and weight are effectively reduced, and the swing scanning spectrometer is miniaturized and lightened.

[0018] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present disclosure. BRIEF DESCRIPTION OF DRAWINGS

[0019] The accompanying drawings, which are incorporated herein and form a part of the specification, illustrate embodiments consistent with the present disclosure and, together with the description, further serve to explain the principles of the disclosure. It is to be understood that the drawings are designed solely for purposes of illustration to be used in conjunction with the description. It is to be understood that the drawings are designed solely for purposes of illustration and are not necessarily drawn to scale. Like reference numbers in different drawings represent the same or similar elements.

[0020] Figure 1 Fig. 1 schematically shows a structure of a hyperspectral imaging device in an exemplary embodiment of the present application;

[0021] Figure 2 Fig. 2 schematically shows a structure of a sub-mirror seat and a connecting plate in an exemplary embodiment of the present application;

[0022] Figure 3 Fig. 3 schematically shows a state after rotation of a focusing turntable in an exemplary embodiment of the present application;

[0023] Figure 4 Fig. 4 schematically shows a structure of a swing mirror mechanism in an exemplary embodiment of the present application.

[0024] Fig. 1 schematically shows a structure of a hyperspectral imaging device in an exemplary embodiment of the present application; DETAILED DESCRIPTION

[0025] Example implementations will now be described more fully with reference to the accompanying drawings. Example implementations can be implemented in any number of ways, and are not limited to the examples described herein. It should be noted that features illustrated in some examples can be combined, substituted, or deleted in other examples without departing from the scope of the present disclosure. Of course, the example implementations are described for illustrative purposes, and are not limiting. The example implementations can be employed in any number of contexts and applications.

[0026] In addition, the drawings are merely schematic and are not drawn to scale. Identical reference numerals in different drawings represent the same or similar elements.

[0027] Exemplary embodiments of the present application will be described in detail below with reference to the drawings. Although exemplary embodiments of the present disclosure are shown in the drawings, it is understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the present disclosure to those skilled in the art. It should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like as used herein, refer to the orientation or positional relationship shown in the drawings, which are for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore the above terms should not be interpreted as limiting the present application. Unless otherwise specifically defined and limited, the terms "mount", "connect", "connect", "fix", "couple" and the like should be interpreted broadly, for example, they can be fixedly connected, or detachably connected, or integrated; they can be mechanically connected, or electrically connected; they can be directly connected, or indirectly connected through an intermediate medium; they can be internal communication between two elements or interaction relationship between two elements, unless otherwise specifically defined. Those skilled in the art should be able to understand the specific meaning of the above terms in the present application according to the specific circumstances.

[0028] To overcome the shortcomings and deficiencies of the prior art, a hyperspectral imaging device is provided in the example embodiment. Referring to Figure 1 As shown, the hyperspectral imaging device includes a lens 5, a housing 7, and a movable mirror seat 1, a swing mirror mechanism 2, a spectrometer 3, and a controller 4 arranged in the inner cavity of the housing 7. The controller 4 is electrically connected to the swing mirror mechanism 2 and the spectrometer, and is used to send control signals to them to control their working states and process feedback data information.

[0029] The housing 7 can serve as a fixed shell of the hyperspectral imaging device, and a through hole can be formed on the first side wall of the front end of the housing 7, and the front end of the lens 5 extends outside the housing 7 through the through hole. Inside the housing 7, the movable mirror seat 1 is arranged parallel to the first side wall, and the rear end of the lens 5 can be fixed on the movable mirror seat 1. The controller 4 can be arranged on the second side wall at the rear end of the housing 7.

[0030] Exemplary, the two sides of the movable lens seat 1 can be symmetrically provided with one or more pairs of limiting columns 8. For example, a step can be formed on the outer side of the movable lens seat 1, and the limiting column 8 is fixed on the step. On the first side wall of the shell 7, limiting holes matched with the limiting columns 8 can be formed on both sides of the lens. The limiting column 8 can be inserted into the limiting hole and moved in the limiting hole, thereby limiting the displacement direction of the movable lens seat 1 and the lens 5. The movable lens seat 1 is limited in the movement direction by the limiting column 8, so that it only slides in a fixed direction.

[0031] Exemplary, a spring 6 can be sleeved on the limiting column 8, so that the spring 6 can be compressed or expanded between the movable lens seat 1 and the first side wall of the shell 7, facilitating the displacement of the movable lens seat 1.

[0032] The central part of the movable lens seat 7 can be a transparent part or a hollow part, so that the light signal entering the lens 5 can be transmitted to the swing mirror of the swing mirror mechanism 2. In addition, a step for mounting and fixing the lens 5 can also be formed on the movable lens seat 7.

[0033] Exemplary, the swing mirror mechanism 2 includes a swing mirror motor 23, a focusing turntable 22 arranged from bottom to top, and a swing mirror 21 arranged in the frame of the focusing turntable 22. The swing mirror motor 23 is electrically connected with the controller 4 and rotates at a certain angle according to the control signal of the controller 4. Figure 4 As shown, the swing mirror motor 23 can be fixed on the bottom surface of the shell 7, the swing mirror motor 23 is arranged at the bottom of the focusing turntable 22 and is used to drive the focusing turntable 22, the transmission shaft 24 of the swing mirror motor 23 is connected with the focusing turntable 22, and when the swing mirror motor 23 works, the transmission shaft 24 is driven to work and drives the focusing turntable 22 to rotate.

[0034] The swing mirror 21 is arranged in the frame of the focusing turntable 22 and rotates with the focusing turntable 22, and is used to reflect the light entering the lens 11 into the spectrometer 3. The swing mirror 21 can be a lens for reflecting the light of the lens 5.

[0035] Exemplary, as shown in Figure 1 or Figure 2 Exemplary, the focusing turntable 22 is an elliptical structure. As shown in Figure 4 As shown, the focusing turntable 22 can be provided with an elliptical outer frame extending outwardly above and below, the outer frame of the focusing turntable 22 is in contact with the movable lens seat 1, so that the upper and lower sides of the swing mirror 21 can be balanced in stress. The focusing turntable 22 abuts against the movable lens seat 1, so that it reciprocates along the limiting direction under the driving of the swing mirror motor 23.

[0036] As shown in Figure 2As shown, when the movable lens holder 1 is close to the first side wall of the housing 7, the long axis of the focusing dial 22 is perpendicular to the movable lens holder 1. Figure 3 As shown, when the focusing dial 22 is rotated to form an angle between the long axis of the focusing dial 22 and the movable lens holder 1, the movable lens holder 1 moves away from the first side wall of the housing 7 and into the inner cavity, driving the lens 5 to displace; simultaneously, the focusing dial 22 drives the swing mirror 21 to rotate, thereby achieving the adjustment of the focal length.

[0037] For example, the focusing dial 22 also adopts other smooth polygonal structures, and the polygonal shape can be calculated according to the relationship between the image distance and the swing mirror angle change, so as to maximize the compensation of the image distance change. The image distance can be the distance between the rear end of the lens and the slit of the spectrometer.

[0038] For example, the swing mirror 21 can be controlled by the controller 4 to swing near the 45° angle between the lens axis. When the deflection angle of the swing mirror deviates from 45°, the corresponding image distance of the spectrometer will increase. Since the shape of the focusing dial 22 is a calculated compensation shape, at this time the focusing dial 22 moves synchronously with the swing mirror 21 and deviates from the 45° position, and the lens holder 1 descends along with the dial shape under the driving of the spring 6, so that the image distance decreases to compensate for the increased image distance.

[0039] For example, as shown in FIG. 6, Figure 2 As shown, the movable lens holder 1 can include two sub-lens holders 9 symmetrically arranged on both sides of the lens 5, and a connecting plate 10 for connecting the two sub-lens holders 9, which acts as a balance plate and can be in contact with the focusing dial 22 of the swing mirror mechanism 2. In addition, the connecting plate 10 can be provided with a limiting block at both ends; correspondingly, the sub-lens holder 2 can be provided with a limiting groove 11 for mounting the limiting block.

[0040] In addition, the size of the limiting groove can be greater than the size of the limiting block, so that the limiting groove 11 and the limiting block are provided with a gap, which ensures that the movable lens holder 1 and the focusing dial 22 are balanced at both ends of the balance bar, so that they can move more smoothly along the limiting direction.

[0041] The imaging device of the present application limits the movement direction of the movable lens holder through the limiting column, so that it only slides in a fixed direction; the focusing dial and the swing mirror are fixed on the swing mirror motor shaft to form an integrated structure, effectively reducing the structural space; when the swing mirror rotates under the driving of the swing mirror motor, the movable lens holder moves up and down under the driving of the focusing dial and the spring, so that the image information of the target object enters the spectrometer through the lens and the swing mirror, and the change of the image distance of the spectrometer is reduced, achieving the focusing effect. Since a single motor is used for driving, the volume and weight can be further reduced, which is beneficial to the miniaturization of the swing scanning spectrometer. Moreover, the use of mechanical structure can avoid the problem of too long focusing time caused by software focusing, and ensures the scanning speed of the swing scanning spectrometer.

[0042] Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the features disclosed herein. It is intended that the specification and examples be considered as exemplary only, with the true scope and spirit of the disclosure being indicated by the following claims.

[0043] It should be understood that the present disclosure is not limited to the precise structures herein described and illustrated in the drawings, and that various modifications and changes can be made without departing from its scope. The scope of the present disclosure is limited only by the claims that follow.

Claims

1. A hyperspectral imaging device, characterized in that, The hyperspectral imaging device includes a lens (5), a housing (7), and a movable mirror mount (1), a mirror tilting mechanism (2), and a spectrometer (3) disposed in the inner cavity of the housing (7); The lens (5) passes through the first side wall of the housing (7) and is connected at one end to the movable lens mount (1); the movable lens mount (1) is arranged parallel to the first side wall of the housing (7); The mirror-sliding mechanism (2) includes: a mirror-sliding motor (23), a focusing turntable (22), and a mirror (21); the mirror-sliding motor (23) is located at the bottom of the focusing turntable (22) and is used to drive the focusing turntable (22); the mirror (21) is located on the focusing turntable (22), rotates with the focusing turntable (22), and is used to reflect the light entering the lens (5) into the spectrometer (3); the focusing turntable (22) has an elliptical structure, and the focusing turntable (22) contacts the movable lens mount (1) to drive the movable lens mount (1) to move when the focusing turntable (22) rotates so as to adjust the distance between the movable lens mount (1) and the first side wall of the housing (7); The spectrometer (3) is located on the side of the mirror mechanism (2) so that light entering the lens (5) is reflected by the mirror mechanism (2) and then enters the spectrometer (3).

2. The hyperspectral imaging device according to claim 1, characterized in that, The movable mirror base (1) is symmetrically provided with limiting posts (8) on both sides, and the first side wall of the housing (7) is provided with a limiting hole that cooperates with the limiting posts (8).

3. The hyperspectral imaging device according to claim 2, characterized in that, A spring (6) is fitted on the limiting post (8).

4. The hyperspectral imaging device according to claim 1, characterized in that, The movable lens mount (1) includes sub-lens mounts (9) symmetrically arranged on both sides of the lens (5), and a connecting plate (10) for connecting the two sub-lens mounts (9), the connecting plate (10) being in contact with the lens swivel mechanism (2).

5. The hyperspectral imaging device according to claim 4, characterized in that, The connecting plate (10) has limit blocks at both ends, and the sub-mirror mount (9) has a limit groove (11) for installing the limit blocks.

6. The hyperspectral imaging device according to claim 5, characterized in that, The limiting groove (11) and the limiting block are provided with a gap.

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