Hyperspectral imaging device

Abstract

The invention relates to the technical field of spectral imaging, in particular to a hyperspectral imaging device, which comprises a lens, a shell, and a movable lens seat, a swing lens mechanism and a spectrograph which are arranged in an inner cavity of the shell, the lens penetrates through the first side wall of the shell, and one end of the lens is connected to the movable lens base. The movable mirror base is parallel to the first side wall of the shell; the swing mirror mechanism is in contact with the movable mirror base so as to drive the movable mirror base to move when the swing mirror mechanism rotates to adjust the distance between the movable mirror base and the first side wall of the shell. The spectrograph is arranged beside the oscillating mirror mechanism so that light entering the lens can enter the spectrograph after being reflected by the oscillating mirror mechanism. Through the arrangement of the integrated swing mirror mechanism, the size and the weight are effectively reduced, and the small-sized and light-weight swing-scanning spectrometer is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of spectral imaging, and in particular to a hyperspectral imaging device. Background Art

[0002] The scanning methods of the spectral imager include: slit scanning method and rotating mirror scanning method. The commonly used swing scanning structure is to rotate the hyperspectral spectrum together with the lens as a whole for swing scanning, or the slit is pushed relative to the lens. This makes the mechanical structure required for the overall swing scanning movement larger, and the volume and weight increase. In occasions with strict weight and space requirements, the traditional swing scanning solution cannot meet the use requirements. In addition, the swing scanning structure that uses a reflector to rotate between the slit and the lens, although it is beneficial to reduce the volume and weight of the structure to meet actual use needs, the structure has a large difference between the edge and center image distance, and there is a problem of out-of-focus, which is not conducive to obtaining high-definition images. It 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 technology section is only used to enhance the understanding of the background of the present disclosure, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Summary of the invention

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

[0005] Other features and advantages of the present invention will become apparent from the following detailed description, or may be learned in part by the practice of the present disclosure.

[0006] According to one aspect of the present invention, a hyperspectral imaging device is provided, the hyperspectral imaging device comprising a lens, a housing, and a movable mirror seat, a swing mirror mechanism, and a spectrometer arranged in an inner cavity of the housing;

[0007] The lens penetrates through the first side wall of the shell and one end is connected to the movable lens seat; the movable lens seat is arranged parallel to the first side wall of the shell;

[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, so as 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 exemplary embodiments, the swing mirror mechanism includes: a swing mirror motor, a focusing turntable, and a swing mirror; wherein 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, rotates as the focusing turntable rotates, and is used to reflect the light entering the lens and then enter the spectrometer; the focusing turntable is in contact with the movable mirror seat.

[0011] In some exemplary embodiments, the focusing dial is an elliptical structure.

[0012] In some exemplary embodiments, limiting posts are symmetrically arranged on both sides of the movable mirror seat, and through holes cooperating with the limiting posts are opened on the first side wall of the shell.

[0013] In some exemplary embodiments, a spring is sleeved on the limiting column.

[0014] In some exemplary embodiments, the movable mirror mount includes sub-mirror mounts symmetrically arranged on both sides of the lens, and a connecting plate for connecting the two sub-mirror mounts, and the connecting plate is in contact with the swing mirror mechanism.

[0015] In some exemplary embodiments, limiting blocks are provided at both ends of the connecting plate, and limiting grooves for installing the limiting blocks are provided on the sub-mirror mount.

[0016] In some exemplary embodiments, a gap is provided between the limiting groove and the limiting block.

[0017] The hyperspectral imaging device provided by the embodiment of the present invention is provided with a rotatable swing mirror mechanism at the rear end of the lens in the housing, and the swing mirror mechanism is in contact with the movable mirror seat, so that when the swing mirror mechanism rotates, the movable mirror seat can be driven to follow the movement, so that the image information of the target object passes through the lens and enters the image distance change of the imaging spectrometer by the swing mirror reflection, thereby achieving the focusing effect, and realizing focal length adjustment by designing the mechanical structure, thereby avoiding the problem of too long software focus search and focusing time, and ensuring the scanning speed of the swing-scanning spectrometer. By providing an integrated swing mirror mechanism, the volume and weight are effectively reduced, and a miniaturized and lightweight swing-scanning spectrometer is realized.

[0018] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings herein are incorporated into the specification and constitute a part of the specification, illustrate embodiments consistent with the present disclosure, and together with the specification are used to explain the principles of the present disclosure. Obviously, the accompanying drawings described below are only some embodiments of the present disclosure, and for ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without creative work.

[0020] Figure 1 A schematic structural diagram of a hyperspectral imaging device in an exemplary embodiment of the present invention is schematically shown;

[0021] Figure 2 A schematic diagram of the structure of a sub-mirror base and a connecting plate in an exemplary embodiment of the present invention is schematically shown;

[0022] Figure 3 A schematic diagram schematically shows a state of a focus dial after rotation according to an exemplary embodiment of the present invention;

[0023] Figure 4 The structural diagram of a swing mirror mechanism in an exemplary embodiment of the present invention is schematically shown.

[0024] Figure numerals: 1. movable mirror seat; 2. swing mirror mechanism; 3. spectrometer; 4. controller; 5. lens; 6. spring; 7. housing; 8. limiting column; 9. sub-mirror seat; 10. connecting plate; 11. limiting groove; 21. swing mirror; 22. focusing turntable; 23. swing mirror motor; 24. transmission shaft. DETAILED DESCRIPTION

[0025] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that the disclosure will be more comprehensive and complete and to fully convey the concepts of the example embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0026] In addition, the accompanying drawings are only schematic illustrations of the present disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings represent the same or similar parts, and thus their repeated description will be omitted.

[0027] Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present disclosure and to enable the scope of the present disclosure to be fully conveyed to those skilled in the art. It should be understood that in the disclosure of the present invention, the orientation or positional relationship indicated by the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore the above terms cannot be understood as limitations on the present invention. Unless otherwise clearly defined and limited, the terms "installed", "connected", "connected", "fixed", "coupled" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. A person skilled in the art should be able to understand the specific meanings of the above terms in the present invention according to the specific circumstances.

[0028] In view of the shortcomings and deficiencies of the prior art, this exemplary embodiment provides a hyperspectral imaging device. Figure 1 As shown, the hyperspectral imaging device includes a lens 5, a housing 7, and a movable mirror base 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 to send control signals thereto, thereby controlling their working states and processing feedback data information.

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

[0030] Exemplarily, one or more pairs of limiting posts 8 may be symmetrically arranged on both sides of the movable mirror base 1. For example, a step may be provided on the outer side of the movable mirror base 1, and the limiting posts 8 may be fixed on the step. Limiting holes that match the limiting posts 8 may be provided on the first side wall of the housing 7 and on both sides of the lens. The limiting posts 8 may be inserted into the limiting holes, and the limiting posts 8 may move in the limiting holes, thereby limiting the displacement direction of the movable base 1 and the lens 5. The movable mirror base 1 is limited in its movable direction by the limiting posts 8, so that it can only slide along a fixed direction.

[0031] Exemplarily, a spring 6 may be sleeved on the limiting column 8 so that the spring 6 can be compressed or expanded between the movable mirror base 1 and the first side wall of the shell 7 to facilitate the displacement of the movable mirror base 1 .

[0032] The center part of the movable mirror 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 installing and fixing the lens 5 can also be provided on the movable mirror seat 7.

[0033] Exemplarily, the swing mirror mechanism 2 includes a swing mirror motor 23, a focus dial 22, and a swing mirror 21 arranged in the frame of the focus dial 22. The swing mirror motor 23 is electrically connected to the controller 4 and rotates 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 housing 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 to the focusing turntable 22. When the swing mirror motor 23 works, the transmission shaft 24 is driven to work, and the transmission shaft 24 drives the focusing turntable 22 to rotate.

[0034] The oscillating mirror 21 is arranged in the frame of the focusing dial 22, rotates with the focusing dial 22, and is used to reflect the light entering the lens 11 and then enter the spectrometer 3. The oscillating mirror 21 can be a lens used to reflect the light of the lens 5.

[0035] Exemplary, reference Figure 1 or Figure 2 As shown in FIG. 1 , the focusing dial 22 is an elliptical structure. Figure 4 As shown, the focusing dial 22 can be provided with an elliptical outer frame extending outward above and below, and the outer frame of the focusing dial 22 is in contact with the movable mirror base 1, so that the upper and lower sides of the swing mirror 21 can be balanced. The focusing dial 22 supports the movable mirror base 1, so that it reciprocates along the limit direction under the drive of the swing mirror motor 23.

[0036] refer to Figure 2As shown, when the movable mirror base 1 is close to the first side wall of the housing 7, the long axis of the focus dial 22 is perpendicular to the movable mirror base 1. Figure 3 As shown, when the focusing dial 22 is rotated so that an angle is formed between the long axis of the focusing dial 22 and the movable mirror base 1, the movable mirror base 1 moves away from the first side wall of the shell 7 and into the inner cavity, driving the lens 5 to move; synchronously, the focusing dial 22 drives the swing mirror 21 to rotate, thereby realizing the adjustment of the focal length.

[0037] For example, the focusing wheel 22 also adopts other smooth polygonal structures, and the shape of the polygon can be calculated according to the relationship between the image distance and the change of the swing mirror angle to compensate for the change of the image distance to the maximum extent. The image distance can be the distance between the rear end of the lens and the slit of the spectrometer.

[0038] For example, the controller 4 can be used to control the swing mirror 21 to swing at an angle of 45° with the lens axis. When the deflection angle of the swing mirror deviates from 45°, the image distance corresponding to the spectrometer will increase. Since the shape of the focusing dial 22 is a calculated compensation shape, the focusing dial 22 moves synchronously with the swing mirror 21 and deviates from the 45° position. Driven by the spring 6, the lens base 1 moves downward along with the shape of the dial, so that the image distance is reduced to compensate for the increased image distance.

[0039] Exemplary, reference Figure 2 As shown, the movable mirror base 1 may include sub-mirror bases 9 symmetrically arranged on both sides of the lens 5, and a connecting plate 10 for connecting the two sub-mirror bases 9, and the connecting plate serves as a balance plate and can be in contact with the focusing dial 22 of the swing mirror mechanism 2. In addition, limit blocks may be arranged at both ends of the connecting plate 10; correspondingly, a limit groove 11 for installing the limit block may be arranged on the sub-mirror base 2.

[0040] In addition, the size of the limit groove can be larger than the size of the limit block, so that a gap is set between the limit groove 11 and the limit block, ensuring that the forces at both ends of the balance rod are balanced between the movable lens seat 1 and the focusing dial 22, so that it can move more smoothly along the limit direction.

[0041] In the imaging device of the present invention, the movable mirror seat is limited in its movable direction by a limit column, so that it can only slide in a fixed direction; the focusing dial and the swing mirror are fixed on the swing mirror motor shaft to form an integrated structure, which effectively reduces the structural space; when the swing mirror rotates under the drive of the swing mirror motor, the movable mirror seat moves up and down under the drive of the focusing dial and the spring, so that the image information of the target object enters the swing mirror after passing through the lens and is reflected into the imaging spectrometer, and the image distance change is reduced, thereby achieving the focusing effect. Due to the use of a single motor drive, the volume and weight can be further reduced, which is conducive to the miniaturization of the swing-scanning spectrometer. In addition, the use of a mechanical structure can avoid the problem of too long software focus-finding time, thereby ensuring the scanning speed of the swing-scanning spectrometer.

[0042] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or customary technical means in the art that are not disclosed in the present disclosure. The specification and examples are to be considered as exemplary only, and the true scope and spirit of the present disclosure are indicated by the claims.

[0043] It should be understood that the present disclosure is not limited to the exact structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A hyperspectral imaging device, characterized in that: The hyperspectral imaging device comprises a lens (5), a housing (7), and a movable mirror seat (1), a swing mirror mechanism (2), and a spectrometer (3) arranged in the inner cavity of the housing (7); The lens (5) passes through the first side wall of the shell (7) and one end is connected to the movable lens seat (1); the movable lens seat (1) is arranged parallel to the first side wall of the shell (7); The swing mirror mechanism (2) is in contact with the movable mirror seat (1) so as to drive the movable mirror seat (1) to move when the swing mirror mechanism (2) rotates, so as to adjust the distance between the movable mirror seat (1) and the first side wall of the housing (7); The spectrometer (3) is arranged beside the swing mirror mechanism (2) so that light entering the lens (5) is reflected by the swing mirror mechanism (2) and then enters the spectrometer (3).

2. The hyperspectral imaging device according to claim 1, characterized in that: The swing mirror mechanism (2) comprises: a swing mirror motor (23), a focusing turntable (22), and a swing mirror (21); wherein 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 swing mirror (21) is arranged on the focusing turntable (22), rotates with the rotation of the focusing turntable (22), and is used to reflect light entering the lens (5) and then enter the spectrometer (3); the focusing turntable (22) is in contact with the movable mirror seat (1).

3. The hyperspectral imaging device according to claim 2, characterized in that: The focusing turntable (22) is an elliptical structure.

4. The hyperspectral imaging device according to claim 1, characterized in that: Limiting posts (8) are symmetrically arranged on both sides of the movable mirror seat (1), and limiting holes matching the limiting posts (8) are provided on the first side wall of the shell (7).

5. The hyperspectral imaging device according to claim 4, characterized in that: The limiting column (14) is sleeved with a spring (6).

6. The hyperspectral imaging device according to claim 1, characterized in that: The movable mirror seat (1) comprises sub-mirror seats (9) symmetrically arranged on both sides of the lens (5), and a connecting plate (10) for connecting the two sub-mirror seats (9), wherein the connecting plate (10) is in contact with the swing mirror mechanism (2).

7. The hyperspectral imaging device according to claim 6, characterized in that: Limit blocks are arranged at both ends of the connection plate (10), and limit grooves (11) for mounting the limit blocks are arranged on the sub-mirror seat (2).

8. The hyperspectral imaging device according to claim 7, characterized in that: A gap is provided between the limiting groove (11) and the limiting block.

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