Hyperspectral camera based on continuously variable film filter and coating method thereof

Abstract

A hyperspectral camera based on a continuously variable film filter and a coating method thereof can solve interference between partial bands of the hyperspectral camera based on the continuously variable film filter. The hyperspectral camera includes: a camera body and a detector chip, wherein a continuously variable film is coated on the detector chip; a semi-transmission half-cut filter is provided in front of the continuously variable film, and a distance between the semi-transmission half-cut filter and the continuously variable film is 0 mm. According to the present invention, the semi-transparent half-cut filter and the detector chip are integrated without any gap therebetween. As a result, optical interference caused by incident light sequentially passing through the semi-transparent half-cut filter and the detector chip is greatly reduced, which can reduce distortion of spectral signals, and finally satisfy wide-band application requirements which can be truly realized based on such technology.

Claims

1. A hyperspectral camera based on a continuously variable film filter, comprising: a camera body (1), wherein a detector chip (2) is installed in the camera body (1), and a continuously variable film (3) is coated on the detector chip (2); a semi-transmission half-cut filter (4) is provided in front of the continuously variable film (3), and a distance between the semi-transmission half-cut filter (4) and the continuously variable film (3) is 0 mm or larger than 0 mm.

2. The hyperspectral camera, as recited in claim 1, wherein the semi-transmission half-cut filter (4) is coated on the continuously variable film (3).

3. The hyperspectral camera, as recited in claim 2, wherein the semi-transmission half-cut filter (4) comprises an infrared cut-off film (42) and a transmission film group.

4. The hyperspectral camera, as recited in claim 3, wherein the transmission film group comprises a visible light cut-off film (41) or a full transmission film.

5. The hyperspectral camera, as recited in claim 1, wherein a mounting structure, which is not in contact with the continuously variable film (3), is installed in front of the continuously variable film (3), and the semi-transmission half-cut filter (4) is coated on the mounting structure.

6. The hyperspectral camera, as recited in claim 5, wherein the mounting structure comprises a lens structure (5) or a packaging structure (6).

7. The hyperspectral camera, as recited in claim 5, wherein the semi-transmission half-cut filter (4) comprises an infrared cut-off film (42) and a transmission film group.

8. The hyperspectral camera, as recited in claim 7, wherein the transmission film group comprises a visible light cut-off film (41) or a full transmission film.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is a front cross-sectional view of the present invention when a distance between a semi-transparent half-cut filter and a continuously variable film is 0 mm;

(2) FIG. 2 is an enlarged view of a position A in FIG. 1 of the present invention;

(3) FIG. 3 is a front cross-sectional view of the present invention when a mounting structure is a lens structure:

(4) FIG. 4 is an enlarged view of a position B in FIG. 3 of the present invention:

(5) FIG. 5 is a perspective view of the lens structure of the present invention;

(6) FIG. 6 is a front cross-sectional view of the present invention when the mounting structure is a packaging structure:

(7) FIG. 7 is an enlarged view of a position C in FIG. 6 of the present invention:

(8) FIG. 8 is a perspective view of the packaging structure of the present invention;

(9) FIG. 9 illustrates a positional relationship between an infrared cut-off film and a visible light cut-off film of the present invention.

(10) Element reference: 1—camera body, 2—detector chip, 3—continuously variable film, 4—semi-transparent half-cut filter, 41—visible light cut-off film, 42—infrared cut-off film, 5—lens structure, 6—packaging structure.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

(11) In order to better illustrate the present invention to those skilled in the art, the present invention will be further described in detail with reference to the accompanying drawings and the following embodiments.

Embodiment 1

(12) Referring to FIGS. 1-2 and 9, a hyperspectral camera based on a continuously variable film filter is illustrated, comprising: a camera body 1, wherein a detector chip 2 is installed in the camera body 1, and a continuously variable film 3 is coated on the detector chip 2; a semi-transmission half-cut filter 4 is provided in front of the continuously variable film 3, and a distance between the semi-transmission half-cut filter 4 and the continuously variable film 3 is 0 mm.

(13) A coating method for a hyperspectral camera based on a continuously variable film filter is also provided, comprising steps of:

(14) installing a detector chip 2 in a camera body 1, and coating a continuously variable film 3 on the detector chip 2; then placing an infrared cut-off film 42 and a visible light cut-off film 41 in a same plane in front of the continuously variable film 3, wherein the infrared cut-off film 42 corresponds to a visible light band of the continuously variable film 3, and the cut-off film 41 corresponds to an infrared light band of the continuously variable film 3.

(15) Working principle: when the distance between the semi-transmission half-cut filter 4 and the continuously variable film 3 is 0 mm, the semi-transmission half-cut filter 4 is directly coated on a surface of the continuously variable film 3. The detection chip is coated with the continuously variable film 3, and a range of the continuously variable film 3 is expanded, which covers a band of 400 nm-1000 nm. The continuously variable film 3 is coated with the semi-transmission half-cut filter 4 which is divided into two parts: one half is the infrared cut-off film 42, wherein the infrared cut-off film 42 corresponds to the visible light band of the continuously variable film 3, and preferably parallel to the continuously variable film 3 to cut off the infrared spectrum; the other half is the visible light cut-off film 41 or a full transmission film, wherein the full transmission film means no treatment is performed, and all incoming light information is allowed to pass through. The visible light cut-off film 41 or the full transmission film corresponds to the infrared light band of the continuously variable film 3, and preferably parallel to the continuously variable film 3 to realize a solution of multi-level light transmission effect. The visible light cut-off film 41 can avoid influence of 400-500 nm band optical information on collection of 800-1000 nm band data, and experiments verified that the 400-500 nm band optical information has little effect on collection of the 800-1000 nm band data.

(16) In summary, the semi-transparent half-cut filter 4 is directly coated on the detector chip 2 which is coated with the continuously variable film 3, so that the semi-transparent half-cut filter 4 and the detector chip 2 are integrated without any gap therebetween. As a result, optical interference caused by incident light sequentially passing through the semi-transparent half-cut filter 4 and the detector chip 2 is greatly reduced, which can reduce distortion of spectral signals.

Embodiment 2

(17) Referring to FIGS. 3-5 and 9, a hyperspectral camera based on a continuously variable film filter is illustrated, comprising: a camera body 1, wherein a detector chip 2 is installed in the camera body 1, and a continuously variable film 3 is coated on the detector chip 2; a semi-transmission half-cut filter 4 is provided in front of the continuously variable film 3, and a distance between the semi-transmission half-cut filter 4 and the continuously variable film 3 is larger than 0 mm.

(18) A coating method for a hyperspectral camera based on a continuously variable film filter is also provided, comprising steps of:

(19) installing the detector chip 2 in the camera body 1, and coating the continuously variable film 3 on the detector chip 2; then installing a lens structure 5, which is not in contact with the continuously variable film 3, in front of the continuously variable film 3 in the camera body 1, and coating the infrared cut-off film 42 and the visible light cut-off film 41 in the same plane on the lens structure 5, wherein the infrared cut-off film 42 corresponds to a visible light band of the continuously variable film 3, and the cut-off film 41 corresponds to an infrared light band of the continuously variable film 3.

(20) When the distance between the semi-transmission half-cut filter 4 and the continuously variable film 3 is larger than 0 mm, the lens structure 5 is provided in front of the continuously variable film 3 without contacting. However, the lens structure 5 is required to be as close as possible to the continuously variable film 3, in such a manner that optical interference caused by incident light sequentially passing through the semi-transparent half-cut filter 4 and the detector chip 2 is greatly reduced, which can reduce distortion of spectral signals.

(21) According to the embodiment 2, the detection chip is still coated with the continuously variable film 3, and a range of the continuously variable film 3 is expanded, which covers a band of 400 nm-1000 nm. The lens structure coated with the semi-transmission half-cut filter 4 is provided in front of the continuously variable film 3, which is divided into two parts: one half is the infrared cut-off film 42, wherein the infrared cut-off film 42 corresponds to the visible light band of the continuously variable film 3, and preferably parallel to the continuously variable film 3 to cut off the infrared spectrum; the other half is the visible light cut-off film 41 or a full transmission film, wherein the full transmission film means no treatment is performed, and all incoming light information is allowed to pass through. The visible light cut-off film 41 or the full transmission film corresponds to the infrared light band of the continuously variable film 3, and preferably parallel to the continuously variable film 3 to realize a solution of multi-level light transmission effect. The visible light cut-off film 41 can avoid influence of 400-500 nm band optical information on collection of 800-1000 nm band data, and experiments verified that the 400-500 nm band optical information has little effect on collection of the 800-1000 nm band data.

(22) The semi-transparent half-cut filter 4 and the detector 2 are separately coated through separately placing the semi-transparent half-cut filter 4 on the mounting structure. Therefore, process requirements and manufacturing costs of the semi-transparent half-cut filter 4 are lower, and flexibility of preparing the semi-transparent half-cut filter 4 is higher.

Embodiment 3

(23) Referring to FIGS. 6-9, a hyperspectral camera based on a continuously variable film filter is illustrated, comprising: a camera body 1, wherein a detector chip 2 is installed in the camera body 1, and a continuously variable film 3 is coated on the detector chip 2; a semi-transmission half-cut filter 4 is provided in front of the continuously variable film 3, and a distance between the semi-transmission half-cut filter 4 and the continuously variable film 3 is larger than 0 mm.

(24) A coating method for a hyperspectral camera based on a continuously variable film filter is also provided, comprising steps of:

(25) installing the detector chip 2 in the camera body 1, and coating the continuously variable film 3 on the detector chip 2; then installing a packaging structure 6, which is not in contact with the continuously variable film 3, in front of the continuously variable film 3 in the camera body 1, and coating the infrared cut-off film 42 and the visible light cut-off film 41 in the same plane on the packaging structure 6, wherein the infrared cut-off film 42 corresponds to a visible light band of the continuously variable film 3, and the cut-off film 41 corresponds to an infrared light band of the continuously variable film 3.

(26) When the distance between the semi-transmission half-cut filter 4 and the continuously variable film 3 is larger than 0 mm, the packaging structure 6 is provided in front of the continuously variable film 3 without contacting. However, the packaging structure 6 is required to be as close as possible to the continuously variable film 3, in such a manner that optical interference caused by incident light sequentially passing through the semi-transparent half-cut filter 4 and the detector chip 2 is greatly reduced, which can reduce distortion of spectral signals.

(27) The rest of the embodiment 3 is the same as those of the embodiment 2, and will not be repeated here.

(28) The above are the embodiments of the present invention. The above-mentioned embodiments and specific parameters in the embodiments are only for clearly describing the invention verification process, and are not intended to be limiting. The protection scope of the present invention is still subject to the following to claims. Any equivalent structural changes made by using the description and drawings of the present invention shall be included in the protection scope.