CN114526819A - Spatial filter device for spectrum expansion - Google Patents
Spatial filter device for spectrum expansion Download PDFInfo
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- CN114526819A CN114526819A CN202111605774.3A CN202111605774A CN114526819A CN 114526819 A CN114526819 A CN 114526819A CN 202111605774 A CN202111605774 A CN 202111605774A CN 114526819 A CN114526819 A CN 114526819A
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- glass
- spectrum
- filter element
- reflection glass
- filter device
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- 238000001228 spectrum Methods 0.000 title claims abstract description 34
- 239000011521 glass Substances 0.000 claims abstract description 44
- 238000001914 filtration Methods 0.000 claims abstract description 19
- 230000003595 spectral effect Effects 0.000 claims abstract description 16
- 230000003287 optical effect Effects 0.000 claims abstract description 14
- 238000003892 spreading Methods 0.000 claims abstract description 13
- 239000000758 substrate Substances 0.000 claims abstract description 9
- 238000002329 infrared spectrum Methods 0.000 claims abstract description 8
- 230000000295 complement effect Effects 0.000 claims abstract description 5
- 230000010363 phase shift Effects 0.000 claims abstract description 4
- 238000001237 Raman spectrum Methods 0.000 claims description 4
- 239000000853 adhesive Substances 0.000 claims description 4
- 230000001070 adhesive effect Effects 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 4
- 239000011347 resin Substances 0.000 claims description 3
- 229920005989 resin Polymers 0.000 claims description 3
- 238000001514 detection method Methods 0.000 abstract description 12
- 238000001069 Raman spectroscopy Methods 0.000 abstract description 4
- 238000009826 distribution Methods 0.000 abstract description 2
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 4
- 229910052753 mercury Inorganic materials 0.000 description 4
- 238000005520 cutting process Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000003915 air pollution Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000000701 chemical imaging Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000011840 criminal investigation Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000010437 gem Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
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- 238000004451 qualitative analysis Methods 0.000 description 1
- 238000004445 quantitative analysis Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000003911 water pollution Methods 0.000 description 1
Images
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/28—Investigating the spectrum
- G01J3/44—Raman spectrometry; Scattering spectrometry ; Fluorescence spectrometry
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/12—Generating the spectrum; Monochromators
- G01J3/18—Generating the spectrum; Monochromators using diffraction elements, e.g. grating
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/20—Filters
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/12—Generating the spectrum; Monochromators
- G01J2003/1204—Grating and filter
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/12—Generating the spectrum; Monochromators
- G01J2003/1226—Interference filters
Landscapes
- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)
- Spectrometry And Color Measurement (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The invention discloses a filter device used in a space with spread spectrum, which comprises an upper layer and a lower layer, wherein the lower layer is a transparent substrate, the upper layer is formed by combining a filter element and anti-reflection glass, the filter element occupies one part of the circle, the anti-reflection glass occupies the complementary part of the circle, the boundary line of the filter element and the anti-reflection glass is a straight line, and the filter element is used for filtering high-level diffraction stray light in the spectral dimension; the anti-reflection glass is used for compensating phase shift brought by the glass; the dividing direction of the antireflection glass is vertical to the spectrum spreading direction. The filter element is colored glass, and the cut-off wavelength aims at the wave band of high-level diffraction stray light needing to be filtered. The invention filters the interference of second-order diffraction and the like in the crossed zone of first-order diffraction and second-order diffraction of different wavelengths by designing an optical element and adopting a common filter element. And displaying accurate spectral distribution on the photosensitive surface of the system. The invention has important significance for spectrum detection, particularly visible light-near infrared spectrum, Raman detection and the like.
Description
Technical Field
The invention belongs to the technical field of optics, and particularly relates to a spatial filter device for spectrum expansion.
Background
The spectrometer is a scientific instrument which decomposes light with complex wavelength components into spectral lines, generally comprises a prism or a diffraction grating and the like, and can measure the light spectrum reflected by the surface of an object by using the spectrometer. The seven colors of sunlight are visible light, but if the sunlight is decomposed by a spectrometer and arranged according to wavelength, the visible light only occupies a small part of the spectrum, and the rest is a spectrum which cannot be distinguished by naked eyes, such as infrared rays, ultraviolet rays, X rays and the like. The optical information is captured by the spectrometer and displayed and analyzed by a photographic negative developing or computerized automatic display numerical instrument, so that the components contained in the article can be detected. This technique is widely used in the detection of air pollution, water pollution, food hygiene, metal industry, and the like.
The visible light near infrared spectrometer is an analytical instrument used in the fields of environmental science and technology and resource science and technology, and is commonly used for qualitative and quantitative analysis of the structures of substances such as soil, minerals, microorganisms, plants and the like. The Raman spectrometer is used for judging and confirming research material components, and is applied to the detection of drugs, the identification of precious stones and the like in criminal investigation, jewelry and other industries. The instrument is famous for its simple structure, easy and simple to handle, high-efficient accuracy of measurement. The optical spectrum detection mostly adopts grating light splitting, however, the accuracy of the optical spectrum detection is affected because the optical spectrum signals of different levels interfere with each other after the optical grating light splitting. Visible near-infrared spectrometers with a wide spectral range and raman spectrometers with high spectral accuracy are particularly needed to overcome such problems.
Disclosure of Invention
To solve the above-mentioned problems, the present invention discloses a spatial filter device for spectrum spreading.
A filter device used in space for spectrum expansion comprises circular upper and lower layers, the lower layer is transparent substrate, the upper layer is composed of filter element and anti-reflection glass, the filter element occupies a part of the circle, the anti-reflection glass occupies a complementary part of the circle, the boundary line between the filter element and the anti-reflection glass is straight line,
the filtering element is used for filtering out the high-order diffraction stray light in a spectral dimension;
the anti-reflection glass is used for compensating phase shift brought by the glass; the direction of the anti-reflection glass boundary is vertical to the direction of spectrum spreading.
The filter element is colored glass, and the cut-off wavelength aims at filtering out a high-level diffraction stray light wave band.
The sizes and positions of the anti-reflection glass and the filter elements are determined by the interference positions of the spectrum spread of the grating.
The filtering element and the anti-reflection glass are bonded through an optical adhesive.
The material of the transparent substrate comprises transparent glass and resin.
The upper layer and the lower layer are fixed by adhesion.
The filter is used for detecting visible light-near infrared spectrum or Raman spectrum and filtering mutual interference on the spectrum.
The invention has the beneficial effects that:
in the spectrum detecting instrument, the first-order diffraction and the second-order diffraction from short wave to long wave are generated due to the light splitting of the grating. The first order diffracted energy is relatively strong and is typically used for spectral detection. However, the first order diffraction and the second order diffraction of different wavelengths can overlap at certain spectrum spreading positions, so that the first order diffraction and the second order diffraction interfere with each other and influence the detection accuracy. The traditional method is to coat a film by a camera, and coat a film layer of long-pass filtering on the overlapped part of visible light and near infrared light to filter out the second-order diffraction of the visible light. The invention overcomes the problem of high cost of camera coating, and provides a filter device used in a spectrum spreading space, wherein a filter element arranged at a near infrared spectrum spreading position filters the interference of the second-order diffraction of visible light to the infrared spectrum. By designing the optical elements, a precise spectral distribution is exhibited on the photosensitive surface of the system. The invention has important significance for spectrum detection, particularly visible light-near infrared spectrum, Raman detection and the like.
Drawings
FIG. 1 is a schematic diagram of a spatial filter device for spectral spreading;
in the figure, a filter element 1, antireflection glass 2 and a transparent substrate 3.
Fig. 2 is a raw image of a standard mercury lamp taken using the spectrometer of the present invention.
Fig. 3 is a fitted linear relationship of image pixels and wavelength for a standard mercury lamp collected using the spectrometer of the present invention.
FIG. 4 is a graph of spectral data collected from a standard mercury lamp after calibration using the spectrometer of the present invention.
Detailed Description
The invention is described below with reference to the drawings and specific examples.
Examples
As shown in fig. 1, a filter device used in a spectrum spread space includes two circular layers, an upper layer and a lower layer, the lower layer is a transparent substrate 3, the upper layer is formed by combining a filter element 1 and anti-reflection glass 2, the filter element 1 occupies a part of a circle, the anti-reflection glass 2 occupies a complementary part of the circle, and a boundary between the filter element 1 and the anti-reflection glass 2 is a straight line.
The filter element 1 is used for filtering out high-order diffraction stray light in spectral dimensions;
the anti-reflection glass 2 is used for compensating phase shift brought by glass; the direction of the anti-reflection glass boundary is vertical to the direction of spectrum spreading.
The filter element 1 is colored glass, and the cut-off wavelength is aimed at filtering out a high-order diffraction stray light wave band.
The sizes and positions of the anti-reflection glass and the filter elements are determined by the interference positions of the spectrum spread of the grating.
The filter element 1 and the antireflection glass 2 may be bonded by an optical adhesive.
The material of the transparent substrate 3 can be transparent glass, resin, etc.
The upper layer and the lower layer can be fixed by adhesion.
The filter is used for detecting visible light-near infrared spectrum or Raman spectrum and filtering mutual interference on the spectrum.
Production examples
The manufacturing method of the filter device comprises the step of cutting the anti-reflection glass and the filter element into circles with equal sizes. The round anti-reflection glass and the filter element are cut along one direction. The complementary boundary line between the round antireflection glass and the filter element is bonded by an optical adhesive. The bottom is continuously bonded and fixed by adopting a transparent substrate. The manufactured optical element can be used for filtering the problem of mutual interference on the spectrum, and the accurate detection of the visible light-near infrared spectrum and the Raman spectrum is realized. The sizes of the anti-reflection glass and the filter element are equivalent to the size of the photosensitive breadth. The direction of cutting the round anti-reflection glass is vertical to the direction of spectrum spreading. The size and position of the cut circular antireflection glass and the filter elements are determined by the interference position of the spectral spread of the grating.
Application examples
To further illustrate this example, a visible-near infrared hyperspectral imaging instrument was fabricated according to the present invention. A spatial filter device for spectral spreading is mounted in a threaded opening in front of the camera's photosurface and secured by a threaded ring. The visible light-near infrared hyperspectral imager manufactured by the method is tested by adopting a standard mercury lamp, the collected image is shown in figure 2, and the fitting linear relation of the pixel coordinate and the wavelength coordinate of the image is shown in figure 3. Without the filtering optical element of the present invention, the spectra would interfere with each other latitudinally, as the visible second order diffraction would be within the range of the near infrared first order diffraction. Resulting in errors in the near infrared band in the spectral detection. When the filtering optical device of the present invention is installed, the filtering element placed at the spectrum spreading position will filter out the interference of the second order diffraction of the visible light, as shown in fig. 4, and the spectrum data detected by the system is consistent with the standard spectrum data.
The embodiments in the above description can be further combined or replaced, and the embodiments are only described as preferred examples of the present invention, and do not limit the concept and scope of the present invention, and various changes and modifications made to the technical solution of the present invention by those skilled in the art without departing from the design concept of the present invention belong to the protection scope of the present invention. The scope of the invention is given by the appended claims and any equivalents thereof.
Claims (7)
1. A spatial filter device for spectral spreading, characterized by: comprises an upper layer and a lower layer which are round, the lower layer is a transparent substrate, the upper layer is formed by combining a filter element and anti-reflection glass, the filter element occupies one part of the round, the anti-reflection glass occupies the complementary part of the round, the boundary of the filter element and the anti-reflection glass is a straight line,
the filtering element is used for filtering out the high-order diffraction stray light in a spectral dimension;
the anti-reflection glass is used for compensating phase shift brought by the glass; the direction of the anti-reflection glass boundary is vertical to the direction of spectrum spreading.
2. The filter device of claim 1, wherein: the filter element is colored glass, and the cut-off wavelength aims at filtering out a high-level diffraction stray light wave band.
3. The filter device of claim 1, wherein: the sizes and positions of the anti-reflection glass and the filter elements are determined by the interference positions of the spectrum spread of the grating.
4. The filter device of claim 1, wherein: the filtering element and the anti-reflection glass are bonded through an optical adhesive.
5. The filter device of claim 1, wherein: the material of the transparent substrate 3 comprises transparent glass and resin.
6. The filter device of claim 1, wherein: the upper layer and the lower layer are fixed by adhesion.
7. The filter device of claim 1, wherein: the method is used for detecting visible light-near infrared spectrum or Raman spectrum and filtering mutual interference on the spectrum.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111605774.3A CN114526819A (en) | 2021-12-25 | 2021-12-25 | Spatial filter device for spectrum expansion |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111605774.3A CN114526819A (en) | 2021-12-25 | 2021-12-25 | Spatial filter device for spectrum expansion |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114526819A true CN114526819A (en) | 2022-05-24 |
Family
ID=81619883
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111605774.3A Pending CN114526819A (en) | 2021-12-25 | 2021-12-25 | Spatial filter device for spectrum expansion |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114526819A (en) |
-
2021
- 2021-12-25 CN CN202111605774.3A patent/CN114526819A/en active Pending
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