Snapshot Imaging Spectroscopy System

Abstract

The present invention provides a snapshot imaging spectroscopy system, including an optical relay unit, an optical waveguide unit that rearranges the light from the optical relay unit, a spectroscopy unit that performs dispersion spectroscopy processing on the light rearranged by the optical waveguide unit, and a detection unit that converts the received optical signal into an electrical signal for output, wherein the optical fiber bundle arrangement density at the light input end of the optical waveguide unit is greater than that at the light output end. The snapshot imaging spectroscopy system provided by the present invention, by using an optical waveguide unit whose optical fiber bundle density at the light input end is greater than that at the light output end, the optical waveguide unit can rearrange the spatial position of the pixels of the object, leaving gaps to accommodate the dispersed light, and finally rearrange the two-dimensional after dispersion into a three-dimensional cube, thereby achieving one-time exposure to obtain the imaging spectroscopy data of the object, greatly improving the speed of spectral imaging, which is of great significance for fast reading of moving objects and spectral imaging of rapidly occurring events.

Description

Technical Field

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

[0002] Imaging spectroscopy is a technology that allows the sensor to obtain a continuous and smooth spectral curve reflecting the characteristics of the target object while acquiring the image of the target object. This "spectral-image integration" technology that can both image and obtain the target spectral curve is called imaging spectroscopy. However, for the push-broom scanning technology or swing-broom imaging technology commonly used in spectral imaging, push-broom scanning is also called "image plane" scanning, which uses a charge-coupled device made of semiconductor materials to form a linear array or surface array sensor, and adopts a wide-angle optical system. With the help of the movement of the remote sensing platform itself in the entire field of view, it sweeps out a strip-shaped track like a brush to obtain a two-dimensional image of the ground along the flight direction.

[0003] Therefore, the existing spectral imaging requires a swing mirror to complete the swing of the field of view angle each time, or the imaging system needs to move relative to the sample to complete a spectral imaging. The imaging process takes a long time and is difficult to meet the spectral imaging of rapidly changing phenomena or rapidly moving samples. Summary of the invention

[0004] The present invention provides a snapshot imaging spectroscopy system to solve the defects in the prior art that the imaging process takes a long time and is difficult to meet the spectral imaging of rapidly changing phenomena or rapidly moving samples. It can obtain the imaging spectral data of the object with one exposure, greatly improving the speed of spectral imaging.

[0005] The present invention provides a snapshot imaging spectroscopy system, comprising:

[0006] Optical relay unit: receives light from the object and focuses it.

[0007] An optical waveguide unit is arranged at the image focus of the optical relay unit to rearrange the light from the optical relay unit.

[0008] Spectral unit: performs dispersion and spectroscopic processing on the light rearranged by the optical waveguide unit,

[0009] Detection unit: receives light from the spectral unit and converts the received light signal into an electrical signal for output.

[0010] Wherein, the optical fiber bundle arrangement density at the light input end of the optical waveguide unit is greater than that at the light output end.

[0011] According to the snapshot imaging spectroscopy system provided by the present invention, there is a gap between each row of the optical fiber bundles at the light output end of the optical waveguide unit.

[0012] According to the snapshot imaging spectroscopy system provided by the present invention, the light distribution after the dispersion and spectral processing of the spectral unit forms a three-dimensional cubic spectral form in the gap.

[0013] According to the snapshot imaging spectroscopy system provided by the present invention, the light input end of the optical waveguide unit is arranged in a two-dimensional array, and the light output end is arranged in a two-dimensional interval.

[0014] According to the snapshot imaging spectroscopy system provided by the present invention, the optical relay unit is a single lens or a lens combination.

[0015] According to the snapshot imaging spectroscopy system provided by the present invention, the spectroscopy unit comprises a collimating lens, a dispersion module and a focusing lens, and the light emitted from the optical waveguide unit enters the collimating lens, the dispersion module and the focusing lens in sequence.

[0016] According to the snapshot imaging spectroscopy system provided by the present invention, the dispersion module is a prism and / or a grating.

[0017] According to the snapshot imaging spectroscopy system provided by the present invention, the focus of the collimating lens is located at the light output end of the optical waveguide unit.

[0018] According to the snapshot imaging spectroscopy system provided by the present invention, the detection unit is a planar array detector.

[0019] The snapshot imaging spectroscopy system provided by the present invention further comprises a computer unit, which receives the electrical signal of the detection unit and converts it into an imaging spectroscopy signal.

[0020] The snapshot imaging spectroscopy system provided by the present invention rearranges the incoming light by adopting an optical waveguide unit whose fiber bundle density at the light input end is greater than that at the light output end. After rearrangement, the light enters the spectral unit for dispersion spectroscopy processing. The optical waveguide unit can rearrange the spatial positions of the pixels of the object, leaving gaps to accommodate the dispersed light, and finally rearrange the two-dimensional dispersed light into a three-dimensional cube, thereby achieving one-time exposure to obtain the imaging spectral data of the object, which greatly improves the speed of spectral imaging and is of great significance for fast reading of moving objects and spectral imaging of rapidly occurring events. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1It is the overall light path diagram of the snapshot imaging spectroscopy system provided by the present invention;

[0023] Figure 2 It is a schematic diagram of the structure of the end portion of the optical waveguide unit of the snapshot imaging spectroscopy system provided by the present invention;

[0024] Figure 3 It is a cubic schematic diagram of the spectrum of the snapshot imaging spectrum system provided by the present invention.

[0025] Reference numerals:

[0026] 100: optical relay unit; 200: optical waveguide unit; 300: spectrum unit;

[0027] 400: detection unit; 500: object; 201: light input end;

[0028] 202: light output end; 203: gap; 301: collimating lens;

[0029] 302: prism; 303: focusing lens. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] In the description of the embodiments of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the embodiments of the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0032] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" 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. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0033] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0034] Combine the following Figures 1 to 3 It should be understood that the following description is only an illustrative embodiment of the present invention and does not constitute a limitation on the present invention.

[0035] The present invention provides a snapshot imaging spectroscopy system, comprising:

[0036] The optical relay unit 100 receives light from the object 500 and focuses it;

[0037] The optical waveguide unit 200 is disposed at the image focus of the optical relay unit 100 and rearranges the light from the optical relay unit 100;

[0038] Spectral unit 300: performs dispersion and spectroscopic processing on the light rearranged by the optical waveguide unit 200;

[0039] Detection unit 400: receives light from the spectrum unit 300 and converts the received light signal into an electrical signal for output;

[0040] The optical fiber bundle arrangement density at the light input end 201 of the optical waveguide unit 200 is greater than that at the light output end 202 .

[0041] In other words, Figure 1As shown, the light emitted or reflected by the object 500 is collected by the optical relay unit 100 and focused on the image focus. The optical waveguide unit 200 placed on the image focus of the optical relay unit 100 receives the light from the optical relay unit 100, rearranges the light, and the rearranged light enters the spectrum unit 300. The spectrum unit 300 performs dispersion and spectroscopic processing on the incoming light and transmits it to the detection unit 400. The detection unit 400 processes the received light, obtains an electrical signal and outputs it.

[0042] Furthermore, the light input end 201 of the optical waveguide unit 200 is arranged in two-dimensional close proximity, and the light output end 202 is arranged in a sparse manner. The spatial position of the object pixels can be rearranged, leaving gaps to accommodate the dispersed light, and finally the dispersed two-dimensional light can be rearranged into a three-dimensional cube. Thus, imaging can be completed with one exposure.

[0043] Furthermore, in one embodiment of the present invention, there is a gap 203 between each row of optical fiber bundles at the light output end 202 of the optical waveguide unit 200, that is, the optical fiber bundles are regularly arranged.

[0044] like Figure 2 As shown, in an optional embodiment of the present invention, the light input end 201 of the optical waveguide unit 200 is arranged in a two-dimensional array, and the light output end 202 is arranged in a two-dimensional interval. A gap 203 is provided between each row of optical fiber bundles at the light output end 202. For the two-dimensional array arrangement of the present invention, each optical fiber bundle on the end face of the optical waveguide unit 200 is neatly arranged without a gap; for the interval arrangement of the present invention, a gap is left between each optical fiber bundle, or a gap is left between the optical fiber bundles between rows, or a gap is left between the optical fiber bundles between columns. Of course, the arrangement of the optical waveguide unit 200 is not limited to the above-mentioned form.

[0045] In addition, if Figure 3 As shown, in an optional embodiment of the present invention, the light after the dispersion and spectral processing of the spectrum unit 300 is distributed in the gap 203 to form a three-dimensional cubic spectrum form. Lights of different wavelengths are in different gaps 203. Thus, imaging can be completed with one exposure.

[0046] In another optional embodiment of the present invention, the optical relay unit 100 is a single lens or a lens combination, whose image focus is on the surface of the optical waveguide unit 200 , and can focus the light emitted or reflected by the object 500 on the surface of the optical waveguide unit 200 .

[0047] Continue to refer Figure 1In another embodiment of the present invention, the spectrum unit 300 includes a collimating lens 301, a dispersion module and a focusing lens 303, and the light emitted from the optical waveguide unit 200 enters the collimating lens 301, the dispersion module and the focusing lens 303 in sequence.

[0048] In the embodiment of the present invention, the dispersion module is a prism 302 and / or a grating. The prism 302 is used to disperse and split the light beam, and can also be a grating with the same dispersion function, or a combination of a grating prism and a grating, or a device with the same function.

[0049] Specifically, the optical waveguide unit 200 rearranges the light beam according to the combination of the optical waveguides, and the rearranged light beam enters the collimating lens 301. The collimating lens 301 collects and collimates the light transmitted by the optical waveguide unit 200. The prism 302 performs dispersion and spectroscopic processing on the collimated light, and the focusing lens 303 converges the dispersed and spectroscopic light beam onto the surface of the detection unit 400.

[0050] In addition, for the collimating lens 301 of the present invention, the focal point of the collimating lens 301 is located at the light output end 201 of the optical waveguide unit 200 .

[0051] In another optional embodiment of the present invention, the detection unit 400 is a planar array detector, which is used to detect the dispersed light and convert the optical signal into an electrical signal.

[0052] Furthermore, in an optional embodiment of the present invention, the snapshot imaging spectroscopy system further includes a computer unit, which receives the electrical signal of the detection unit 400 and converts it into an imaging spectroscopy signal. The computer unit may be an FPGA.

[0053] The snapshot imaging spectroscopy system provided by the present invention rearranges the incoming light by adopting an optical waveguide unit whose fiber bundle density at the light input end is greater than that at the light output end. After rearrangement, the light enters the spectral unit for dispersion spectroscopy processing. The optical waveguide unit can rearrange the spatial positions of the pixels of the object, leaving gaps to accommodate the dispersed light, and finally rearrange the two-dimensional dispersed light into a three-dimensional cube, thereby achieving one-time exposure to obtain the imaging spectral data of the object, which greatly improves the speed of spectral imaging and is of great significance for fast reading of moving objects and spectral imaging of rapidly occurring events.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A snapshot imaging spectroscopy system, characterized in that: include: Optical relay unit: receives light from the object and focuses it. An optical waveguide unit is arranged at the image focus of the optical relay unit to rearrange the light from the optical relay unit. Spectral unit: performs dispersion and spectroscopic processing on the light rearranged by the optical waveguide unit, Detection unit: receives light from the spectral unit and converts the received light signal into an electrical signal for output. Among them, the arrangement density of the optical fiber bundles at the light input end of the optical waveguide unit is greater than that at the light output end; there is a gap between each row of the optical fiber bundles at the light output end of the optical waveguide unit; the light distribution after the dispersion and spectral processing of the spectrum unit forms a three-dimensional cubic spectrum form in the gap; the light input end of the optical waveguide unit is a two-dimensional surface array arrangement, and the light output end is a two-dimensional interval arrangement.

2. The snapshot imaging spectroscopy system according to claim 1, characterized in that: The optical relay unit is a single lens or a lens combination.

3. The snapshot imaging spectroscopy system according to claim 1, characterized in that: The spectral unit comprises a collimating lens, a dispersion module and a focusing lens, and the light emitted from the optical waveguide unit enters the collimating lens, the dispersion module and the focusing lens in sequence.

4. The snapshot imaging spectroscopy system according to claim 3, characterized in that: The dispersion module is a prism and / or a grating.

5. The snapshot imaging spectroscopy system according to claim 3, characterized in that: The focal point of the collimating lens is located at the light output end of the optical waveguide unit.

6. The snapshot imaging spectroscopy system according to claim 1, characterized in that: The detection unit is a planar array detector.

7. The snapshot imaging spectroscopy system according to claim 1, characterized in that: It also includes a computer unit, which receives the electrical signal from the detection unit and converts it into an imaging spectrum signal.

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