CN109668633A - Light spectrum image-forming complex probe method based on AOTF - Google Patents
Light spectrum image-forming complex probe method based on AOTF Download PDFInfo
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- CN109668633A CN109668633A CN201811518323.4A CN201811518323A CN109668633A CN 109668633 A CN109668633 A CN 109668633A CN 201811518323 A CN201811518323 A CN 201811518323A CN 109668633 A CN109668633 A CN 109668633A
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- 230000003595 spectral effect Effects 0.000 claims abstract description 46
- 238000001514 detection method Methods 0.000 claims abstract description 13
- 230000003068 static effect Effects 0.000 claims description 11
- 230000009466 transformation Effects 0.000 claims description 4
- 230000003287 optical effect Effects 0.000 abstract description 10
- 238000000701 chemical imaging Methods 0.000 abstract description 9
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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
- G01J3/2823—Imaging spectrometer
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
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Abstract
Light spectrum image-forming complex probe method provided by the invention based on AOTF, AOTF works at 0 grade of diffraction, form bandstop filter, infrared detector carries out imaging detection to 0 grade of light, when AOTF does not work, detects broadband information, when AOTF works, surveying tape resistance is filtered compared with broadband information, and the differential signal of two kinds of information when working when AOTF does not work with AOTF is spectral information, can obtain the complete spectral information of target using time-division scanning mode.Light spectrum image-forming complex probe method provided by the invention based on AOTF can be achieved at the same time broadband imaging and two kinds of functions of light spectrum image-forming using single set optical system and single detector, have the advantages that compact-sized, multi-functional；With it is existing based on the spectral imaging technology of diffraction ± 1 grade AOTF compared with, spectral energy that the present invention is obtained by the way of 0 grade of AOTF diffraction and calculus of differences switch AOTF will 1 times of increase or more, spectral detectivity is higher.
Description
Technical field
The present invention relates to infrared spectroscopy imaging detection technical fields, more particularly to the light spectrum image-forming complex probe based on AOTF
Method.
Background technique
Light spectrum image-forming is more and more being paid attention to as a kind of arbitrary way that traditional optical detects.It can be obtained
The data cube (x-y- λ) for taking target, can directly reflect the spectral signature or even body surface substance for being observed object at
Point.It has broad application prospects in target acquisition, identification and reconnaissance and surveillance field.
Different according to used scanning mode, optical spectrum imagers are broadly divided into two classes: spacescan type and length scanning
Type.Spacescan type optical spectrum imagers are using beam splitters such as Amici prism, diffraction grating, and design is simple, luminous flux is big, letter
Number record is fast, but there are operating spectral areas to be limited by material transmitance, angle dispersive power and wavelength are related and to lens material
Optical characteristics requires the disadvantages of stringent.Length scanning type realizes the spectrum acquisition to imageable target by controllable bandpass filter,
Based on acousto-optic tunable filter (AOTF).Flexible, diffraction efficiency height, sound are selected with small in size, light-weight, central wavelength
Should be rapid, tuning range is wide the advantages that, has very big application potential in light spectrum image-forming field.
AOTF light spectrum image-forming Detection Techniques used at present operate mainly in diffraction ± 1 grade AOTF, form bandpass filtering, work
Make in spectral scan mode, have work Polarization Detection mode, spectral resolution is high, spectral coverage number is more, detection spectral coverage can be automatically controlled
The characteristics of, but bring in single spectral coverage that target and background energy be weaker, spectral scan detection mode bring is not suitable for detection fortune
The problem of moving-target spectrum.
Summary of the invention
The light spectrum image-forming complex probe method based on AOTF that the purpose of the present invention is to provide a kind of, to solve single spectral coverage
The problem of interior target and background energy are weaker, spectral scan detection mode is not suitable for detection moving target spectrum.
In order to solve the above-mentioned technical problem, the technical scheme is that provide a kind of light spectrum image-forming based on AOTF multiple
Detection method is closed, when AOTF does not work, detects broadband information, when AOTF works, surveying tape resistance is filtered to be believed compared with broadband
Breath, the differential signal of two kinds of information when working when AOTF does not work with AOTF are spectral information, can using time-division scanning mode
Obtain the complete spectral information of target.
Further, to static target, AOTF is first in off position, obtains the broadband imaging letter of target scene
Breath, then AOTF carries out spectral scan by the frequency of transformation radio-frequency driven, the broadband figure that will be acquired image with obtain for the first time
As information is subtracted each other, the spectrum picture of static target is obtained.
Further, to moving target, AOTF is successively in work and idle alternating state, passes through switch AOTF two
The image-forming information of a state carries out calculus of differences after tracking to moving target, obtains the spectrum letter of the moving target traced into
Breath.
Further, the state closed in radio-frequency driven, AOTF are in off position, and diffraction light-free, incident light will be saturating
Cross AOTF；In the state that radio-frequency driven is opened, AOTF is in running order, generates 0 grade and ± 1 grade of diffraction light, at 0 grade of diffraction,
AOTF forms bandstop filter.
Further, under control system and the control of radio-frequency driven module, n adjacent spectral coverages are diffracted into AOTF's by AOTF
± 1 grade, n is positive integer, changes the spectral coverage width of 0 grade of AOTF diffraction of bandstop filter, control spectrum after calculus of differences
Resolution ratio.
Further, it is sequentially generated different radiofrequency signals using control system control radio-frequency driven, makes the diffraction 0 of AOTF
The band resistance signal of the grade curve of spectrum is in time-division scanning mode in a wavelength band, needs to obtain by time-division scanning covering
Spectral coverage range.
Light spectrum image-forming complex probe method provided by the invention based on AOTF, using single set optical system and single detection
Broadband imaging and two kinds of functions of light spectrum image-forming can be achieved at the same time in device, have the advantages that compact-sized, multi-functional；It is based on existing
The spectral imaging technology of diffraction ± 1 grade AOTF is compared, and the present invention is by the way of 0 grade of AOTF diffraction and calculus of differences switch AOTF
The spectral energy obtained will increase by 1 times or more, and spectral detectivity is higher.
Detailed description of the invention
Invention is described further with reference to the accompanying drawing:
Fig. 1 a is ± 1 level work of AOTF in the light spectrum image-forming complex probe method provided in an embodiment of the present invention based on AOTF
Pattern diagram；
Fig. 1 b is AOTF0 level work mould in the light spectrum image-forming complex probe method provided in an embodiment of the present invention based on AOTF
Formula schematic diagram；
Fig. 2 a is transmittance curve figure when AOTF provided in an embodiment of the present invention does not work；
Fig. 2 b is 0 grade of transmittance curve figure of AOTF under high light spectrum image-forming mode provided in an embodiment of the present invention；
Fig. 2 c is 0 grade of transmittance curve figure of AOTF under multispectral imaging mode provided in an embodiment of the present invention；
Fig. 3 a is the spectral transmittance curve graph under high light spectrum image-forming mode provided in an embodiment of the present invention；
Fig. 3 b is the spectral transmittance curve graph under multispectral imaging mode provided in an embodiment of the present invention；
Fig. 4 is that static target spectrum obtains in the light spectrum image-forming complex probe method provided in an embodiment of the present invention based on AOTF
Take pattern diagram；
Fig. 5 is that moving target spectrum obtains in the light spectrum image-forming complex probe method provided in an embodiment of the present invention based on AOTF
Take pattern diagram.
Specific embodiment
Below in conjunction with the drawings and specific embodiments to the light spectrum image-forming complex probe method proposed by the present invention based on AOTF
It is described in further detail.According to following explanation and claims, advantages and features of the invention will be become apparent from.It should be noted
It is that attached drawing is all made of very simplified form and using non-accurate ratio, only to facilitate, lucidly aid in illustrating this hair
The purpose of bright embodiment.
Core of the invention thought is that the light spectrum image-forming complex probe method provided by the invention based on AOTF uses
Broadband imaging and two kinds of functions of light spectrum image-forming can be achieved at the same time in single set optical system and single detector, have it is compact-sized,
Multi-functional advantage；With it is existing based on the spectral imaging technology of diffraction ± 1 grade AOTF compared with, the present invention use 0 grade of AOTF diffraction
And the spectral energy that the mode of calculus of differences switch AOTF obtains will increase by 1 times or more, spectral detectivity is higher.
AOTF is a kind of narrowband tunable optical filter.It is the light-splitting device according to made of acousto-optic interaction principle.When a branch of multiple
Coloured light passes through when having Photoelasticity crystal of a high-frequency vibration, and the monochromatic light of a certain wavelength will be generated in crystals spread out
Penetrate, transmitted from crystal at a certain angle, do not occur the polychromatic light of diffraction then along the former light direction of propagation directly transmitted through
Thus crystal achievees the purpose that light splitting.When crystal vibration frequency changes, the monochromatic wavelength of transmissive also accordingly changes.
When unpolarized collimated light passes through AOTF crystal, apply the RF signal of certain frequency to crystal, after crystal
Emergent light other than 0 grade of light, can also generate ± 1 grade of diffraction light.When radio-frequency driven is closed, incident light is whole after AOTF
Go out from 0 grade of light emission；When adding radio-frequency driven ,+1 grade of diffraction light of AOTF be narrowband corresponding with driving frequency lightwave signal (-
1 grade of diffraction light is identical as+1 grade of diffraction optical wavelength, polarization state is orthogonal), and remaining optical signal is emitted from 0 grade
AOTF ± 1 grade work in the light spectrum image-forming complex probe method based on AOTF that Fig. 1 a provides for the embodiment of the present invention one
Operation mode schematic diagram；AOTF0 in the light spectrum image-forming complex probe method based on AOTF that Fig. 1 b provides for the embodiment of the present invention one
Level work pattern diagram.A and Fig. 1 b referring to Fig.1, a kind of light spectrum image-forming complex probe method based on AOTF, AOTF work
At 0 grade of diffraction, bandstop filter is formed, infrared detector carries out imaging detection to 0 grade of light, when AOTF does not work, detects wide wave
Segment information, when AOTF works, surveying tape resistance is filtered compared with broadband information, two kinds when working when AOTF does not work with AOTF
The differential signal of information is spectral information, can obtain the complete spectral information of target using time-division scanning mode.
To static target, AOTF is first in off position, obtains the broadband image-forming information of target scene, then
AOTF carries out spectral scan by the frequency of transformation radio-frequency driven, the broad wavelength band image information phase that will be acquired image with obtain for the first time
Subtract, obtains the spectrum picture of static target.To moving target, AOTF is successively in work and idle alternating state, passes through
The image-forming information of two states of switch AOTF carries out calculus of differences after tracking to moving target, obtains the moving target traced into
Spectral information.
Under control system and the control of radio-frequency driven module, n adjacent spectral coverages are diffracted into ± 1 grade of AOTF by AOTF, and n is
Positive integer changes the spectral coverage width of 0 grade of AOTF diffraction of bandstop filter, controls the resolution ratio of the spectrum after calculus of differences.
The state that AOTF work is opened in radio-frequency driven, under control system control, radio-frequency driven module is sequentially generated not
Same radiofrequency signal makes the band resistance signal of 0 grade of curve of spectrum of diffraction of AOTF scan shape in the time-division in a wavelength band
State scans the spectral coverage range that covering needs to obtain by the time-division.
By controlling the different working condition of AOTF, there are three kinds of operating modes, can be completed at the same time infrared broadband at
Picture and light spectrum image-forming complex probe function.
Fig. 2 a is the transmittance curve figure when AOTF that the embodiment of the present invention one provides does not work.Broadband imaging pattern:
AOTF does not work, and energy converter is without input, and the transmittance curve of device is all penetrated referring to Fig. 2 a, broadband energy (E) at this time
0 grade of AOTF.
Fig. 2 b is 0 grade of transmittance curve figure of AOTF under the high light spectrum image-forming mode that the embodiment of the present invention one provides.Fig. 3 a
Spectral transmittance curve graph under the high light spectrum image-forming mode provided for the embodiment of the present invention one.High light spectrum image-forming mode: transducing
Device has 1 frequency input, and the transmittance curve of device is as shown in Figure 2 b at this time, lacks the relatively broadband energy of 1 unit spectral coverage
(E1) AOTF0 grades are penetrated, the energy and E do subtraction, as high light spectrum image-forming energy, corresponding EO-1 hyperion transmittance curve
As shown in Figure 3a.
Fig. 2 c is 0 grade of transmittance curve figure of AOTF under the multispectral imaging mode that the embodiment of the present invention one provides；Fig. 3 b
Spectral transmittance curve graph under the multispectral imaging mode provided for the embodiment of the present invention one.Multispectral imaging mode: transducing
Device has m frequency input, and the transmittance curve of device is as shown in Figure 2 c at this time, the relatively broadband of missing m continuous unit spectral coverages
Energy (Em) penetrates AOTF0 grades, and the energy and E do subtraction, as multispectral imaging energy, corresponding multispectral transmitance
Curve is as shown in Figure 3b.
In addition, system is achieved in that the spectrum acquisition of static target and moving target respectively
Static target spectrum in the light spectrum image-forming complex probe method based on AOTF that Fig. 4 provides for the embodiment of the present invention one
Obtaining mode schematic diagram；To static target, AOTF is first in off position in system, obtain the broadband of target scene at
As information, then AOTF passes through the frequency of transformation radio-frequency driven, carries out spectral scan as shown in figure 4, by acquisition image and for the first time
The broad wavelength band image information of acquisition subtracts each other the spectrum picture for obtaining static target.
Fig. 5 is that moving target spectrum obtains in the light spectrum image-forming complex probe method provided in an embodiment of the present invention based on AOTF
Take pattern diagram.To moving target, AOTF is successively being in work --- idle alternating state in system, such as Fig. 5 institute
Show, carries out after tracking moving target by the image-forming information of two states of switch AOTF obtaining after calculus of differences tracing into
The spectral information of moving target.
Obviously, those skilled in the art can carry out various changes and deformation without departing from essence of the invention to the present invention
Mind and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to include these modifications and variations.
Claims (6)
1. a kind of light spectrum image-forming complex probe method based on AOTF, which is characterized in that when AOTF does not work, detection broadband letter
Breath, when AOTF works, surveying tape resistance is filtered compared with broadband information, two kinds of information when working when AOTF does not work with AOTF
Differential signal be spectral information, the complete spectral information of target can be obtained using time-division scanning mode.
2. the light spectrum image-forming complex probe method based on AOTF as described in claim 1, which is characterized in that when target is static
When target, AOTF is first in off position, obtains the broad wavelength band image information of target scene, and then AOTF is penetrated by transformation
The frequency of frequency driving carries out spectral scan, and acquisition image is subtracted each other with the broad wavelength band image information obtained for the first time, obtains static mesh
Target spectrum picture.
3. the light spectrum image-forming complex probe method based on AOTF as described in claim 1, which is characterized in that when target is movement
When target, AOTF is successively in work and idle alternating state, by the image-forming information of two states of switch AOTF to fortune
Moving-target carries out calculus of differences after tracking, and obtains the spectral information of the moving target traced into.
4. the light spectrum image-forming complex probe method based on AOTF as described in claim 1, which is characterized in that closed in radio-frequency driven
The state closed, AOTF are in off position, diffraction light-free, and incident light will transmit through AOTF；Radio-frequency driven open state,
AOTF is in running order, generates 0 grade and ± 1 grade of diffraction light, and at 0 grade of diffraction, AOTF forms bandstop filter.
5. the light spectrum image-forming complex probe method based on AOTF as claimed in claim 4, which is characterized in that in control system and
Under the control of radio-frequency driven, n adjacent spectral coverages are diffracted into ± 1 grade of AOTF by AOTF, and n is positive integer, change 0 grade of AOTF diffraction
Bandstop filter spectral coverage width, control after calculus of differences spectrum resolution ratio.
6. the light spectrum image-forming complex probe method based on AOTF as claimed in claim 4, which is characterized in that utilize control system
Control radio-frequency driven is sequentially generated different radiofrequency signals, makes the band resistance signal of 0 grade of curve of spectrum of diffraction of AOTF in a wave
It is in time-division scanning mode in segment limit, the spectral coverage range that covering needs to obtain is scanned by the time-division.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113790798A (en) * | 2021-09-03 | 2021-12-14 | 中国科学院西安光学精密机械研究所 | Seamless spectral imaging device, system and method for dynamic point target tracking measurement |
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| US6100944A (en) * | 1997-10-10 | 2000-08-08 | Boulder Nonlinear Systems, Inc. | Polarizing interferometer using multiorder and zero order birefringence switches |
| US20020135879A1 (en) * | 2001-02-20 | 2002-09-26 | Valdimir Pogrebinsky | Super high resolution optical resonator |
| CN1748172A (en) * | 2002-12-20 | 2006-03-15 | 叶纯 | Device and method for an optical tunable polarization interface filter |
| CN101907513A (en) * | 2010-07-23 | 2010-12-08 | 中国科学院上海技术物理研究所 | Diffraction property low-light test system and method of acousto-optic tunable filter (AOTF) |
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2018
- 2018-12-12 CN CN201811518323.4A patent/CN109668633B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6100944A (en) * | 1997-10-10 | 2000-08-08 | Boulder Nonlinear Systems, Inc. | Polarizing interferometer using multiorder and zero order birefringence switches |
| US20020135879A1 (en) * | 2001-02-20 | 2002-09-26 | Valdimir Pogrebinsky | Super high resolution optical resonator |
| CN1748172A (en) * | 2002-12-20 | 2006-03-15 | 叶纯 | Device and method for an optical tunable polarization interface filter |
| CN101907513A (en) * | 2010-07-23 | 2010-12-08 | 中国科学院上海技术物理研究所 | Diffraction property low-light test system and method of acousto-optic tunable filter (AOTF) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113790798A (en) * | 2021-09-03 | 2021-12-14 | 中国科学院西安光学精密机械研究所 | Seamless spectral imaging device, system and method for dynamic point target tracking measurement |
| CN113790798B (en) * | 2021-09-03 | 2022-07-19 | 中国科学院西安光学精密机械研究所 | Seamless spectral imaging device, system and method for dynamic point target tracking measurement |
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