CN209927715U - Spectrum-configurable visible and terahertz multispectral composite detection imaging device - Google Patents
Spectrum-configurable visible and terahertz multispectral composite detection imaging device Download PDFInfo
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Abstract
The patent discloses a visible and terahertz multispectral composite detection imaging device with configurable spectrum, which is based on an optical filtering technology and an aperture segmentation technology, combines an area array optical filter, an area array lens and an area array detector, adopts a common aperture design of a visible multispectral imaging channel and a terahertz multispectral imaging channel, combines a reflector with a scanning function, a Cassegrain telescope with adjustable object distance and a filter pack with configurable channel, realizes multispectral composite detection imaging of targets at different distances, and is suitable for the fields of deep space detection, aerial remote sensing and the like.
Description
Technical Field
The spectral imaging device related to the patent is a multispectral composite detection imaging device which covers visible and terahertz wave bands and can perform spectral configuration according to purposes. The optical multi-spectral composite detection imaging device is based on an optical filtering technology and an aperture segmentation technology, combines an area array optical filter, an area array lens and an area array detector, adopts a common aperture design of a visible multi-spectral imaging channel and a terahertz multi-spectral imaging channel, combines a reflector with a scanning function, a Cassegrain telescope with adjustable object distance and a filter pack with configurable channels, realizes multi-spectral composite detection imaging of targets at different distances, and is suitable for the fields of deep space detection, aerial remote sensing and the like.
Background
The imaging spectrometer not only collects high-resolution spatial information of the ground object target, but also has the capability of collecting spectral information of the ground object target, and can directly analyze the material composition of the target from the obtained remote sensing data, thereby more effectively distinguishing the target. The required spectral range varies from application to application.
Vibrational spectroscopy in modern mineral chemistry recognizes that the transition of molecules between rotational, vibrational levels produces visible-terahertz spectra, and the vibration of groups or lattices of polyatomic molecules produces visible-terahertz spectra, which can be used to identify mineral species and obtain some valuable information on mineral structure, composition, thermodynamic constants, chemical bond classes and reactions between them by measuring the rotational, vibrational spectra of minerals. According to the laboratory measurement data published in mineral visible atlas (scientific publishing agency, 5 months 1982) and the latest disclosure, sulfide, halide, oxide, hydroxide, nitrate, carbonate, borate, sulfate, phosphate, silicate and the like have abundant fingerprint spectrum in the visible-terahertz wave band (1-100 μm). And the silicates, carbonates, sulfates, phosphates, oxides and hydroxides are main minerals forming the earth surface structure of the star body, so that rock components on the surface of the star body and the abundance of mineral species can be determined by measuring the far visible-terahertz spectrum of the thermal radiation of the silicates, carbonates, sulfates, phosphates, oxides and hydroxides, and the evolution rule of the star body can be deduced according to the abundance of the mineral species.
There are two types of spectroscopic instruments currently available for mineral analysis. One is a visible spectrum imager used for aerial remote sensing, which uses a mercury cadmium telluride detector, and the spectrometer can only cover 15 μm at most. The onboard thermal infrared spectrum imager can obtain 180-waveband spectrum information in a spectrum range of 8.0-12.5 mu m by grating light splitting, but the onboard thermal infrared spectrum imager cannot work in a terahertz waveband with longer wavelength. The other type is a visible Fourier spectrometer used for laboratory research and analysis, the wavelength of the visible terahertz wave band can be covered by the visible terahertz wave band through replacing the detector accessories, but the visible terahertz wave band is not suitable for the fields of aerial remote sensing and deep space detection due to the fact that the working mode of time scanning and the defects of moving parts are relied on.
The disadvantages of the prior art are mainly reflected in the following two aspects: the visible spectrometer in the field of aerial remote sensing can realize hyperspectral imaging in a visible waveband, but is limited by a response waveband of a detector and a working waveband of a grating and cannot work in a longer waveband range; and secondly, the visible Fourier spectrometer for laboratory scientific research and analysis is limited by spectral line acquisition time, defects of moving parts and data redundancy, so that the application of the visible Fourier spectrometer in the fields of aerial remote sensing and deep space exploration is limited.
Disclosure of Invention
Aiming at the defects in the prior art, the patent provides a visible-terahertz composite detection imaging device with a configurable spectrum, which is suitable for the fields of aerial remote sensing, deep space detection and the like.
The technical scheme of this patent is as follows:
a visible-terahertz composite detection imaging device with configurable spectrum comprises a scanning plane reflector 1, a parabolic reflector 3, a spherical reflector 4, a color separation sheet 6, a visible area array optical filter 7, a visible area array lens 8, a visible area array detector 9, a terahertz area array optical filter 11, a terahertz area array lens 12 and a terahertz area array detector 13 which are sequentially arranged according to optical path transmission, wherein the visible area array detector 9 is further sequentially connected with a visible detector control processing system 10 and a control acquisition processing computer 15, the terahertz area array detector 13 is further sequentially connected with a terahertz detector control processing system 14 and a control acquisition processing computer 15, the scanning plane reflector 1 is further sequentially connected with a scanning rotating mechanism 2 and a control acquisition processing computer 15, the spherical reflector 4 is positioned in a slide rail 5 and is accurately controlled by the control acquisition processing computer 15 to control the moving step length, as shown in figure 1 of the specification.
The parabolic reflector 3, the spherical reflector 4 and the slide rail 5 form a Cassegrain telescope 16 with adjustable object distance. When a target 19 with the object distance of l is imaged, the position of the spherical reflector 4 on the slide rail 5 is changed by controlling the acquisition processing computer 15, so that the distance d between the parabolic reflector 3 and the spherical reflector 4 meets the formula (1); when an infinite-distance target is observed, the position of the spherical reflector 4 on the slide rail 5 is changed, so that the distance d between the parabolic reflector 3 and the spherical reflector 4 satisfies the formula (2), wherein f1'、f2' denotes focal lengths of the parabolic mirror 3 and the spherical mirror 4, respectively, l denotes an object distance, a denotes a distance from a principal ray emitted from the object 19 to the plane mirror 1, and b denotes a distance from the plane mirror 1 to the parabolic mirror 3 from a principal ray emitted from the object 19.
d＝f1'-f2' (2)
l＝a+b (3)
The visible area array filter 7, the visible area array lens 8 and the visible area array detector 9 form a visible detection channel 17; the terahertz area array optical filter 11, the terahertz area array lens 12 and the terahertz area array detector 13 form a terahertz detection channel 18; the scanning plane reflector 1, the Cassegrain telescope 16, the color separation sheet 6, the visible detection channel 17 and the terahertz detection channel 18 form an optical system of the spectrum-configurable visible-terahertz composite detection imaging device; the scanning rotating mechanism 2, the visible detector control processing system 10, the terahertz detector control processing system 14 and the control acquisition processing computer 15 form a control processing system of the spectrum-configurable visible-terahertz composite detection imaging device.
The color separation sheet 6 is a high-pass filter, reflects visible waves of 0.38-0.77 mu m, transmits terahertz waves with the wavelength larger than 15 mu m, and realizes separation of terahertz waves and visible beams.
The visible area array filter 7 is a filter pack, which comprises 40 square filters with different central wavelengths and side lengths of a, the wavelengths of the filters meet the formula (4),
λi＝0.38+0.01*(i-1)(μm),i＝1,2,3,…,40 (4)
wherein i represents the number of the filter, λiThe central wavelength of the ith optical filter is represented, 9 optical filters can be configured as required each time to form a 3 × 3 area array optical filter, as shown in the attached figure 3 of the specification, and different textures in the figure represent optical filters with different central wavelengths; the visible area array lens 8 consists of 9 side lengths of a and a focal length of f1The square lenses are formed by arranging and gluing the square lenses according to 3-by-3, and are shown in the attached figure 4 of the specification; the visible area array detector 9 is positioned on the focal plane of the visible area array lens 8 and consists of 9 small-scale visible area array detectors with m, the pixel size of the unit detector forming the small-scale visible area array detector is X, the size of each small-scale visible area array detector is mX, and the distance d between adjacent small-scale visible area array detectors1Satisfies the formula (5), as shown in the attached figure 5 in the specification, wherein d1The pitch of the small-scale visible area array detector is represented, m represents the number of rows or columns of the small-scale visible area array detector constituting the visible area array detector 9, and X represents the pixel size of the unit detector constituting the small-scale visible area array detector.
d1＝a-mX (5)
The terahertz area array optical filter 11 is an optical filter pack, and comprises 72 square optical filters with different central wavelengths and side lengths of a, wherein the wavelengths of the optical filters meet the formula (6);
λj＝16+2(j-1)(μm),j＝1,2,3,…,70,71,72
wherein j represents the number of the filter, λjThe central wavelength of the jth filter is shown, and 9 filters can be configured each time according to requirements to form a 3 × 3 area array filter; the terahertz area array lens 12 is composed of 9 side lengths of a and a focal length of f2The square silicon mirror is formed by arranging and gluing the square silicon mirrors according to 3 x 3; the terahertz area array detector 13 is positioned on a focal plane of the terahertz area array lens 12 and formed by arranging 9 terahertz unit detectors according to 3 x 3, and the terahertz unitsThe size of the detector pixel is Y x Y, and the distance between adjacent terahertz unit detectors is d2Satisfies the formula (7), as shown in the attached figure 6 in the specification, wherein d2The distance between the terahertz unit detectors is represented, and Y represents the pixel size of the terahertz unit detectors.
d2＝a-Y (7)
Focal length f of the visible area array lens 8 and the terahertz area array lens 121、f2The formula (8) is required to be satisfied:
wherein f is1、f2The focal lengths of the visible area array lens 8 and the terahertz area array lens 12 are respectively represented, m represents the number of rows or columns of the small-scale visible area array detector forming the visible area array detector 9, X represents the pixel size of the unit detector forming the small-scale visible area array detector, and Y represents the pixel size of the terahertz unit detector.
The field angle alpha of the visible-terahertz multispectral composite detection imaging device with the configurable spectrum satisfies the formula (9):
wherein M represents the vertical axis magnification of the Cassegrain telescope 16, f2The focal length of the terahertz area array lens 12 is shown, and Y represents the pixel size of the terahertz unit detector.
The visible detector control processing system 10 performs parallel processing on the multi-element signals collected by the visible area array detector 9, and synthesizes visible color images of different spectral bands of the detected target through the control collection processing computer 15, and the terahertz detector control processing system 14 performs parallel processing on the signals collected by the terahertz area array detector 13, and synthesizes terahertz spectrum images of the detected target through the control collection processing computer 15.
The scanning plane mirror 1 controls the scanning rotating mechanism 2 through the control acquisition processing computer 15 to realize the large-field-of-view imaging of the target.
The action principle of this patent is as follows:
when imaging an infinite target, the distance d between the parabolic reflector 3 and the spherical reflector 4 satisfies the formula (2) by changing the position of the spherical reflector 4 on the slide rail 5, at this time, the visible-terahertz wave radiated by the infinite target enters the cassegrain telescope 16 after being reflected by the scanning plane reflector 1, and the parallel incident dichroic filters 6 are divided into two paths after being reflected by the parabolic reflector 3 and the spherical reflector 4: one path of visible reflection wave is 0.38-0.77 mu m, is received by a visible area array detector 9 through the filtering of a visible area array filter 7 and the convergence of a visible area array lens 8, and is processed by a visible detector control processing system 10 and a control acquisition processing computer 15 to form a visible spectrum image of a target; the other path of the terahertz transmission wave is larger than 15 microns, the terahertz transmission wave is received by the terahertz area array detector 13 through filtering of the terahertz area array filter 11 and convergence of the terahertz area array lens 12, and a terahertz spectrum image of the target is formed through processing of the terahertz detector control processing system 14 and the control acquisition processing computer 15. The scanning rotating mechanism 2 is controlled by the control acquisition processing computer 15 to drive the scanning plane reflecting mirror 1 to realize the scanning imaging of the target.
When the limited far target 19 is imaged, the position of the spherical reflector 4 on the slide rail 5 is changed, so that the distance d between the parabolic reflector 3 and the spherical reflector 4 meets the formula (1), at the moment, terahertz waves radiated by the target 19 enter the Cassegrain telescope 16 after being reflected by the scanning plane reflector 1, and are reflected by the parabolic reflector 3 and the spherical reflector 4, and the parallel incidence dichroic filters 6 are divided into two paths: one path of the visible reflected wave is 0.38-0.77 mu m, is received by the visible area array detector 9 through the filtering of the visible area array filter 7 and the convergence of the visible area array lens 8, and is processed by the visible detector control processing system 10 and the control acquisition processing computer 15 to form a visible spectrum image of the target 19; the other path of the terahertz transmission wave is larger than 15 microns, the terahertz transmission wave is filtered by the terahertz area array filter 11 and converged by the terahertz area array lens 12 to be received by the terahertz area array detector 13, and the terahertz spectrum image of the target 19 is formed through the processing of the terahertz detector control processing system 14 and the control acquisition processing computer 15. The scanning and imaging of the target 19 are realized by controlling the acquisition processing computer 15 to control the scanning rotating mechanism 2 to drive the scanning plane reflecting mirror 1.
Compared with the prior art, the visible-terahertz multispectral composite detection imaging device with the configurable spectrum has the following advantages: compared with a visible spectrometer in the field of aerial remote sensing, the visible-terahertz multispectral composite detection imaging device with the configurable spectrum has the advantages of wide coverage spectrum range and simple structure; compared with a visible Fourier spectrometer, the visible-terahertz multispectral composite detection imaging device with the configurable spectrum can realize real-time detection and imaging of a target THz spectrum; the visible-terahertz multispectral composite detection imaging device with the configurable spectrum adopts a common-aperture design of a visible multispectral imaging channel and a terahertz multispectral imaging channel, and combines a reflector with pointing and scanning functions and a filter pack with the configurable channel, so that multispectral composite detection imaging of a target can be realized; and the spectrum-configurable visible-terahertz multispectral composite detection imaging device uses the optical filter as a light splitter, has the advantages of simple structure and small volume, and is suitable for outdoor complex and changeable environments.
Drawings
FIG. 1 is a schematic diagram of an imaging device for object distance infinite visible-terahertz multi-spectral composite detection
FIG. 2 is a schematic diagram of an object distance limited distance visible-terahertz multispectral composite detection imaging device
FIG. 3 is a schematic diagram of a visible area array filter
FIG. 4 is a schematic view of a visible area array lens
FIG. 5 is a schematic view of a visible area array detector
FIG. 6 is a schematic diagram of a terahertz area array detector
Detailed Description
The patent is further explained by combining the attached figure 1 and the attached figure 2 of the specification.
Example 1: spectrum-configurable visible-terahertz multispectral composite detection imaging device
This patent adopts and adopts the following structure:
1. the aperture of the scanning plane reflecting mirror 1 is 100mm x 100mm, and the surface is plated with an Al reflecting film.
2. The scanning rotating mechanism 2 is a two-dimensional turntable produced by Kunming machine tool of Shen machine group, and the model is as follows: FG-2660, azimuth table rotation range: 360 degrees, orientation turntable indexing precision: 3', pitching table rotation range: 120 degrees, pitch turntable indexing accuracy: 5".
3. The cassegrain telescope 16 is manufactured by Nanjing, Chinese astronomical instruments, Inc., in which the caliber of the parabolic mirror 3 is 120mm, the focal length is 1586.12mm, and the diameter of the central opening is 32 mm; the aperture of the spherical reflector 4 is 35mm, and the focal length is 530.55 mm; the slide rail 5 is made of silicon carbide, and the electric control step length is 0.1 mm.
4. The beam splitter 6 has a diameter of 40mm, transmits terahertz waves having a wavelength of more than 15 μm, and transmits visible waves having a wavelength of 0.38 to 0.77 μm with an average transmittance of 85% in a wavelength band, and reflects visible waves having an average reflectance of 95% in a wavelength band, manufactured by the russian TYDEX corporation.
5. The configuration of the detection channel 17 can be seen: the size of the visible area array filter 7 is 30mm x 30mm, narrow-band filters with central wavelengths of 0.38 μm, 0.45 μm, 0.5 μm, 0.53 μm, 0.58 μm, 0.6 μm, 0.65 μm, 0.7 μm and 0.75 μm in sequence are respectively selected according to the imaging requirements of mineral components, the size of a single square filter is 10mm x 10mm, and the narrow-band filters are manufactured by Toho light company; it can be seen that the size of the area array lens 8 is 30mm x 30mm, and the area array lens is formed by gluing 9 square BK7 lenses according to a 3 x 3 array, the size of a single square sub lens is 10mm x 10mm, and the focal length is 30 mm; the visible area array detector 9 consists of 9 small area array detectors, each small area array comprises 200 × 200 pixels, and the size of a single pixel of the small area array detector is 2 μm × 2 μm.
6. Construction of the terahertz detection channel 18: the size of the terahertz area array filter 11 is 30mm x 30mm, narrow-band filters with central wavelengths of 18.5 μm, 21 μm, 27.1 μm, 35.6 μm, 40.4 μm, 42.7 μm, 43.7 μm, 72.3 μm and 85.5 μm in sequence are respectively selected according to the requirement of mineral component measurement, the terahertz area array filter is manufactured by Russian TYDEX, and the size of a single square filter is 10mm x 10 mm; the terahertz area array lens 12 is a silicon lens, the size of the terahertz area array lens is 30mm by 30mm, the size of a single square sub-lens is 10mm by 10mm, and the focal length is 150 mm; the terahertz area array detector 13 is composed of 9 single-point terahertz detectors, and the pixel size is 2mm by 2 mm.
7. The visible detector control processing system 10 and the terahertz detector control processing system 14 both include corresponding functions of a reading circuit, a preamplifier, filtering and the like.
8. The control acquisition processing computer 15 is a Hewlett Packard (HP) computer, model i5-7300 HQ.
The main work flow of this patent does:
1. starting up, selecting a measuring object distance: when imaging an infinite object, the position of the spherical mirror 4 on the slide rail 5 is changed so that the distance d between the parabolic mirror 3 and the spherical mirror 4 satisfies the equation (2), i.e., 1055.57 mm.
2. And selecting a measurement target, and configuring the visible filter and the terahertz filter according to the measurement target.
3. At this time, the visible-terahertz wave radiated by the infinite target enters the cassegrain telescope 16 after being reflected by the scanning plane reflector 1, and is reflected by the parabolic reflector 3 and the spherical reflector 4, and the parallel incidence color separation sheet 6 is divided into two paths: one path of visible reflection wave is 0.38-0.77 mu m, is received by a visible area array detector 9 through the filtering of a visible area array filter 7 and the convergence of a visible area array lens 8, and is processed by a visible detector control processing system 10 and a control acquisition processing computer 15 to form a visible spectrum image of a target; the other path of the terahertz transmission wave with the wavelength larger than 15 microns is received by the terahertz area array detector 13 through filtering of the terahertz area array filter 11 and convergence of the terahertz area array lens 12, and is processed by the terahertz detector control processing system 14 and the control acquisition processing computer 15 to form a terahertz spectrum image of the target. The scanning rotating mechanism 2 is controlled by the control acquisition processing computer 15 to drive the scanning plane reflecting mirror 1 to realize the scanning imaging of the target.
4. When imaging a limited distant target, the position of the spherical mirror 4 on the slide rail 5 is changed so that the distance d between the parabolic mirror 3 and the spherical mirror 4 satisfies the formula (1).
5. And selecting a measurement target, and configuring the visible filter and the terahertz filter according to the measurement target.
6. At the moment, the terahertz waves radiated by the finite target enter the Cassegrain telescope 16 after being reflected by the scanning plane reflector 1, and are reflected by the parabolic reflector 3 and the spherical reflector 4, and the parallel incidence dichroic filters 6 are divided into two paths: one path of the visible reflected wave is 0.38-0.77 mu m, is received by the visible area array detector 9 through the filtering of the visible area array filter 7 and the convergence of the visible area array lens 8, and is processed by the visible detector control processing system 10 and the control acquisition processing computer 15 to form a visible spectrum image of the target 19; the other path of the terahertz transmission wave is larger than 15 microns, the terahertz transmission wave is filtered by the terahertz area array filter 11 and converged by the terahertz area array lens 12 to be received by the terahertz area array detector 13, and the terahertz spectrum image of the target 19 is formed through the processing of the terahertz detector control processing system 14 and the control acquisition processing computer 15. The scanning and imaging of the target 19 are realized by controlling the acquisition processing computer 15 to control the scanning rotating mechanism 2 to drive the scanning plane reflecting mirror 1.
Claims (5)
1. The utility model provides a configurable visible of spectrum and terahertz multispectral compound detection imaging device, includes scanning plane speculum (1), parabolic mirror (3), spherical mirror (4), color separation piece (6), visible area array filter (7), visible area array lens (8), visible area array detector (9), terahertz area array filter (11), terahertz area array lens (12), terahertz area array detector (13), its characterized in that:
the imaging device comprises a scanning plane reflector (1), a parabolic reflector (3), a spherical reflector (4), a color separation sheet (6), a visible area array filter (7), a visible area array lens (8), a visible area array detector (9), a terahertz area array filter (11), a terahertz area array lens (12) and a terahertz area array detector (13) in sequence according to the sequence of light path transmission; the plane array visible area array detector (9) is sequentially connected with a visible detector control processing system (10) and a control acquisition processing computer (15), the terahertz area array detector (13) is sequentially connected with a terahertz detector control processing system (14) and a control acquisition processing computer (15), and the scanning plane reflector (1) is sequentially connected with a scanning rotating mechanism (2) and a control acquisition processing computer (15);
the spherical reflector (4) is positioned in the slide rail (5) and is accurately controlled by a control acquisition processing computer (15) to move step length, and forms a Cassegrain telescope (16) with adjustable object distance together with the parabolic reflector (3);
the visible area array optical filter (7), the visible area array lens (8), the visible area array detector (9) and the visible detector control processing system (10) form a visible detection channel (17); the terahertz area array optical filter (11), the terahertz area array lens (12), the terahertz area array detector (13) and the terahertz detector control processing system (14) form a terahertz detection channel (18); the optical system of the spectrum-configurable visible and terahertz composite detection imaging device is composed of the scanning plane reflector (1), the Cassegrain telescope (16), the color separation sheet (6), the visible detection channel (17) and the terahertz detection channel (18);
the scanning rotating mechanism (2), the visible detector control processing system (10), the terahertz detector control processing system (14) and the control acquisition processing computer (15) form a control processing system of the visible and terahertz composite detection imaging device with configurable spectrum;
when imaging an infinite target, the position of the spherical reflector (4) on the slide rail (5) is changed by controlling the acquisition processing computer (15), so that the distance d between the parabolic reflector (3) and the spherical reflector (4) meets the requirement
d＝f′1-f′2
Wherein f'1、f′2Respectively showing the focal lengths of the parabolic reflector (3) and the spherical reflector (4);
at the moment, visible-terahertz waves radiated by an infinite target enter a Cassegrain telescope (16) through the reflection of a scanning plane reflector (1), are reflected by a paraboloid reflector (3) and a spherical reflector (4), and enter a dichroic sheet (6) in parallel and are divided into two paths by the dichroic sheet: one path of visible reflection wave is 0.38-0.77 mu m, is received by a visible area array detector (9) through filtering of a visible area array filter (7) and convergence of a visible area array lens (8), and forms a visible spectrum image of a target through processing of a visible detector control processing system (10) and a control acquisition processing computer (15); the other path of the terahertz transmission wave is larger than 15 microns, the terahertz transmission wave is received by a terahertz area array detector (13) through filtering of a terahertz area array filter (11) and convergence of a terahertz area array lens (12), and a terahertz spectrum image of a target is formed through processing of a terahertz detector control processing system (14) and a control acquisition processing computer (15); the scanning rotating mechanism (2) is controlled by the control acquisition processing computer (15) to drive the scanning plane reflecting mirror (1) to realize the scanning imaging of the target;
when a target (19) with an object distance of l is imaged, the position of the spherical reflector (4) on the slide rail (5) is changed by controlling the acquisition processing computer (15), so that the distance d between the parabolic reflector (3) and the spherical reflector (4) meets the requirement
Wherein, f'1、f′2Respectively represents the focal lengths of the parabolic reflector (3) and the spherical reflector (4), l represents the object distance, a represents the distance from a chief ray emitted by a target (19) to the plane-tracing reflector (1), and b represents the distance from the plane-tracing reflector (1) to the parabolic reflector (3) from the chief ray emitted by the target (19);
at the moment, visible-terahertz waves radiated by a target (19) with an object distance of l enter a Cassegrain telescope (16) through the reflection of a scanning plane reflector (1), and are reflected by a parabolic reflector (3) and a spherical reflector (4) to enter a dichroic sheet (6) in parallel and are divided into two paths: one path of visible reflected wave is 0.38-0.77 mu m, is received by a visible area array detector (9) through filtering of a visible area array filter (7) and convergence of a visible area array lens (8), and forms a visible spectrum image of a target (19) through processing of a visible detector control processing system (10) and a control acquisition processing computer (15); the other path of the terahertz transmission wave is larger than 15 microns, is filtered by a terahertz area array filter (11) and converged by a terahertz area array lens (12), is received by a terahertz area array detector (13), and is processed by a terahertz detector control processing system (14) and a control acquisition processing computer (15) to form a terahertz spectrum image of a target (19); the scanning and imaging of the target (19) are realized by controlling the scanning and rotating mechanism (2) to drive the scanning plane reflecting mirror (1) through the control acquisition and processing computer (15).
2. The visible and terahertz multispectral composite detection imaging device capable of being configured in spectrum according to claim 1, wherein the visible area array filter (7) is a filter pack comprising 40 filters with different central wavelengths and side lengths of a square, and the wavelengths of the filters meet the requirement,
λi＝0.38+0.01*(i-1)(μm),i＝1,2,3,…,40
wherein i represents the number of the filter, λiThe central wavelength of the ith filter is shown, and 9 filters can be configured as required each time to form a 3 x 3 area array filter; the visible area array lens (8) consists of 9 side lengths of a and a focal length of f1The square lenses are formed by arranging and gluing the square lenses according to 3-by-3; the visible area array detector (9) is positioned on the focal plane of the visible area array lens (8) and consists of 9 small-scale visible area array detectors with m × m, and the distance between every two adjacent small-scale visible area array detectors meets the requirement
d1＝a-mX
Wherein d is1The distance between the small-scale visible area array detectors is represented, m represents the number of rows or columns of the small-scale visible area array detectors forming the visible area array detectors (9), and X represents the pixel size of the unit detectors forming the small-scale visible area array detectors.
3. The visible and terahertz multispectral composite detection imaging device capable of being configured in spectrum according to claim 1, wherein the terahertz area array filter (11) is a filter pack, comprises 72 filters with different central wavelengths and side lengths of a square, and the wavelengths of the filters meet the requirement;
λj＝16+2(j-1)(μm),j＝1,2,3,…,70,71,72
wherein j represents the number of the filter,λjthe central wavelength of the jth filter is shown, and 9 filters can be configured each time according to requirements to form a 3 × 3 area array filter; the terahertz area array lens (12) is composed of 9 side lengths of a and a focal length of f2The square silicon mirror is formed by arranging and gluing the square silicon mirrors according to 3 x 3; the terahertz area array detector (13) is positioned on a focal plane of the terahertz area array lens (12) and formed by arranging 9 terahertz unit detectors according to 3 x 3, and the distance between every two adjacent terahertz unit detectors meets the requirement
d2＝a-Y
Wherein d is2The distance between the terahertz unit detectors is represented, and Y represents the pixel size of the terahertz unit detectors.
4. The spectrally configurable visible and terahertz multispectral composite detection imaging device according to claim 1, wherein the focal lengths f of the visible area array lens (8) and the terahertz area array lens (12) are set to be equal to each other1、f2The requirements are as follows:
wherein f is1、f2The focal lengths of the visible area array lens (8) and the terahertz area array lens (12) are respectively represented, m represents the number of lines or columns of a small-scale visible area array detector forming the visible area array detector (9), X represents the pixel size of a unit detector forming the small-scale visible area array detector, and Y represents the pixel size of the terahertz unit detector.
5. The spectrally configurable visible and terahertz multispectral composite detection imaging device according to claim 1, wherein the field angle α of the system satisfies:
wherein M represents the vertical axis magnification of the Cassegrain telescope (16), f2Terahertz area array lens(12) Y represents the pixel size of the terahertz unit detector.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920411659.4U CN209927715U (en) | 2019-03-29 | 2019-03-29 | Spectrum-configurable visible and terahertz multispectral composite detection imaging device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113949787A (en) * | 2020-06-30 | 2022-01-18 | 北京小米移动软件有限公司 | Optical filter assembly, lens module, electronic device, imaging method and storage medium |
| CN109946263B (en) * | 2019-03-29 | 2023-07-04 | 中国科学院上海技术物理研究所 | Spectrum-configurable visible and terahertz multispectral composite detection imaging device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109946263B (en) * | 2019-03-29 | 2023-07-04 | 中国科学院上海技术物理研究所 | Spectrum-configurable visible and terahertz multispectral composite detection imaging device |
| CN113949787A (en) * | 2020-06-30 | 2022-01-18 | 北京小米移动软件有限公司 | Optical filter assembly, lens module, electronic device, imaging method and storage medium |
| CN113949787B (en) * | 2020-06-30 | 2024-01-09 | 北京小米移动软件有限公司 | Optical filter assembly, lens module, electronic device, imaging method and storage medium |
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