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A multi-fold grating, hyperspectral detection device and method

A detection device and grating technology, which is applied in the field of hyperspectral detection, can solve the problems of low light source utilization efficiency, achieve the effect of short interaction time, increase utilization rate, and improve spatial resolution

Active Publication Date: 2021-11-23
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem of low efficiency of light source use based on ordinary grating coherent hyperspectral detectors, the present invention provides a multi-fold grating, and a multi-fold grating-based coherent hyperspectral detection device and method

Method used

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  • A multi-fold grating, hyperspectral detection device and method
  • A multi-fold grating, hyperspectral detection device and method
  • A multi-fold grating, hyperspectral detection device and method

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Embodiment 1

[0041] Such as figure 1 As shown, the present embodiment provides a hyperspectral detection device, which includes a laser source 1, a beam splitter 2, a first receiver 3, a first objective lens 5, a collimation system lens unit, a first polarizer 8, multiple Folded grating 9, second polarizer 10, second objective lens 11, filter 12, second receiver 13 and signal processing and imaging system 4;

[0042] The hyperspectral detection device can detect targets at a long distance or at a short distance. When it is carried on an aircraft (ordinary aircraft, helicopter, transport aircraft, unmanned aerial vehicle, etc.) Detection of long-distance target areas on the ground; for example, for roadless waterfronts that are not easy to reach with conventional vehicles on the ground, shallow water areas that cannot be reached by ships, the detection device can be carried on the drone, or the detection device can be airborne Enter caves to detect or detect snow mountains from the air or ...

Embodiment 2

[0062] Such as figure 2 As shown, the present embodiment provides a multifold grating 9, which includes a bottom plate 91 and several protrusions 92 connected to one side of the bottom plate 91; several protrusions 92 are arranged at intervals, and the two sides of the protrusion 92 The connected bottom plate 91 is provided with a light-shielding surface 93; the surface of the protrusion 92 includes a plurality of planes, and the plurality of planes are connected end to end in order to form a plurality of folded surfaces.

[0063] Since multiple planes on the surface of the protrusion 92 are connected end to end to form multiple folded surfaces, there is a certain angle between two adjacent planes, which can be either an acute angle or an obtuse angle, and, These included angles may all be set to a uniform value, or may be set to different values ​​as required. In order to understand the technical solution of the present invention more clearly, the surface of the protrusion ...

Embodiment 3

[0073] Such as image 3As shown, the present embodiment provides a hyperspectral detection method, comprising the following steps:

[0074] Obtain local oscillator reference light;

[0075] Among them, the local oscillator reference light is A 6 (t)=A 6 cos(ω 6 t+φ 6 )

[0076] where ω 6 is the frequency of light, φ 6 is the phase of light, A 6 is the light amplitude;

[0077] Obtain light carrying target information;

[0078] Among them, light A carrying target information 17 (t)=A 17 cos(ω 17 t+φ 17 )

[0079] where ω 17 is the frequency of light, φ 17 is the phase of light; A 17 is the amplitude of the light;

[0080] performing coherent processing and imaging on the local oscillator reference light and the light carrying target information to obtain coherent processing and imaging results;

[0081] Coherent processing is:

[0082]

[0083] I(t) is the coherent combined light intensity, β is the photoelectric conversion coefficient, and t is the time;...

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Abstract

The invention relates to a multi-fold grating, a hyperspectral detection device and a method, wherein the multi-fold grating includes a bottom plate and several protrusions connected to one side of the bottom plate; several protrusions are arranged at intervals, There is a light-shielding surface on the bottom plate connected to both sides of the protrusion; the raised surface includes multiple planes, and the multiple planes are connected end to end to form multiple folding surfaces. Obviously, the formed grating has multiple folding surfaces. When the refracted grating diffracts light, it can disperse the energy gathered by the zero-order spectrum; when the multi-refracted grating is applied to a hyperspectral detection device, when the filter in the detection device filters out the zero-order spectrum, avoiding the Most of the light energy is filtered out, and most of the light energy can be used for target detection, which greatly improves the utilization rate of the light source, and also improves the accuracy of hyperspectral detection of targets.

Description

technical field [0001] The invention relates to the field of hyperspectral detection, in particular to a polyreflected grating, hyperspectral detection device and method. Background technique [0002] The characteristic of hyperspectral is to improve the resolution of the detection equipment. The characteristic of ordinary grating diffraction is that the zero order gathers 80% of the light energy, but the hyperspectral detection device does not need the zero order line of the grating. All the light has to be filtered out by filters. Therefore, the commonly used grating coherent hyperspectral detection equipment greatly reduces the efficiency of the light source. [0003] Finnish Mike Flinkman (Mika Flinkman) discussed the characteristics and imaging mechanism of hyperspectral in the article (Transmission filters formingorthogonal basis for spectral imaging purposes), but did not realize the organic combination design of hyperspectral and multi-fold surface grating A multifu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/21G01N21/47G01N21/01
CPCG01N21/01G01N21/21G01N21/4788G01N2021/0112
Inventor 吴明红雷波金石琦王鸿勇徐刚
Owner SHANGHAI UNIV
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