CN102353451A - Secondary acousto-optic tunable filter hyperspectral imaging method and device - Google Patents
Secondary acousto-optic tunable filter hyperspectral imaging method and device Download PDFInfo
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- CN102353451A CN102353451A CN2011102738806A CN201110273880A CN102353451A CN 102353451 A CN102353451 A CN 102353451A CN 2011102738806 A CN2011102738806 A CN 2011102738806A CN 201110273880 A CN201110273880 A CN 201110273880A CN 102353451 A CN102353451 A CN 102353451A
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Abstract
The invention relates to a secondary acousto-optic tunable filter hyperspectral imaging method and a device, and belongs to the technical field of optical remote sensing imaging. A high-resolution spectral image of a target to be tested can be taken at visible and near infrared wave bands, and the identification and analysis of the feature and characteristics of the target are realized. The invention is characterized in that: the optical imaging technology and a secondary acousto-optic tunable filter part are organically combined, two acousto-optic tunable filters are used as light splitting elements for spectral imaging and are connected in series in an optical structure, and transmission spectra are multiplied; and the resolution of the system is more than four times higher than that of a spectral imaging system of a single acoustic-optic tunable filter (AOTF). The secondary acousto-optic tunable filter hyperspectral imaging technology and the device have the advantages of high spectral resolution, small size, light weight, quick spectral scanning speed, wide tuning range and the like, and can be widely applied to the fields of remote sensing science, agricultural census, geographic information and the like.
Description
Technical field
The present invention relates to adjustable filtering ultra-optical spectrum imaging method of a kind of secondary acousto-optic and device; This device can obtain the view data and the spectroscopic data of target simultaneously; Be applied to remote sensing science, agricultural census, geography information and the field such as obtain; Realization belongs to the remote optical sensing technical field of imaging to the pattern of target and the identification and the analysis of characteristic.
Background technology
Remote sensing technology is mainly used in geographic investigation, resource dynamic monitoring, the generaI investigation of agricultural production situation etc., comprises obtaining of target information, the contents such as parsing of remote sensing image processing, target property.
Ultra-optical spectrum imaging system is a kind of important means in the human observation world, the understanding world; Traditional ultra-optical spectrum imaging system relies on the mechanical tuning technology that target is scanned, its complex structure, bulky, the fast development and the widespread use that have restricted the Hyper spectral Imaging technology.The secondary filtering acousto-optic is adjustable, and the Hyper spectral Imaging technology has then solved this technical barrier.
The present invention's the adjustable filtering Hyper spectral Imaging of secondary acousto-optic device is to be made up of light source, imaging moiety, the secondary acousto-optic is adjustable filtering part, BCCD and PC control section.
Its light source be with sunshine as ordinary light source, get aspect the light comparatively convenient.
Image optics partly is made up of three preposition telescopes of no central obscuration, and the telescopic system of this imaging system can converge the distant place luminous energy, by telecentric beam path the light beam that converges is incided on the adjustable filtering part of secondary acousto-optic with the quasi-parallel direction again.Utilize two AOTF as the adjustable filter part of secondary acousto-optic, the folded light beam of light source irradiation target to be measured incides AOTF
1, by AOTF
1Beam split, its+1 order diffraction light beam enters into AOTF
2As its incident light, through AOTF
2Beam split once more, its AOTF
2+ light beam of 1 order diffraction light finally incides among the BCCD, thus reach higher resolution, utilize BCCD to obtain the image information of target again.Light spectrum image-forming part based on the secondary filtering device can change the radiofrequency signal of its computing machine to the control of its input according to application requirements, and then the flexible spectral resolution, improves the spectral resolution of imaging system under the prerequisite of assurance good signal.
This device has movement-less part, and volume is little, in light weight, resolution is high, signal to noise ratio (S/N ratio) is high, tuning and advantage such as sweep velocity is fast, wavelength stability is good.AOTF is applicable to online and on-the-spot to the spectrum picture collection, can be applicable to omnibearing product quality and detects.
This device utilizes BCCD as image receiving system, and BCCD is also referred to as back illumination CCD, and its advantage is the little front lit CCD that is better than using always with the response spectrum scope of noise.
The present invention is a kind of novel imaging technique that optics, spectroscopy, precision optical machinery, electronic technology and computer technology are melted into a whole.Related basic technology and device are ripe, and this invention can realize.
Summary of the invention
Adjustable filtering ultra-optical spectrum imaging method of a kind of secondary acousto-optic and device, its device is made up of light source, the secondary acousto-optic is adjustable filtering part, BCCD imaging moiety, PC control and administrative section.The present invention utilizes the core parts of the adjustable filtering part of secondary acousto-optic as the beam split part; According to the acousto-optic interaction principle; Rely on the flexible variation of ultrasonic frequency that the center optical wavelength is selected; Make its two AOTF that certain wavelength difference arranged; The wavelength difference that can obtain to be fit at the equilibrium point place can access very high resolution.
Light source irradiation is to object the time; Reflected by objects light enters into imaging system; Adopt binary optical lenses as imaging moiety; It is to combine with the zoom system, pancreatic system with binary optical lenses from the axle three-mirror system; These group lens are made up of the preposition telescope of the no central obscuration that three secondary asphericals generate; Not only have the light collecting light ability that improves multispectral imaging, and help the miniaturization and of system.Such imaging system can converge to beam collimation in the secondary filtering part.
The main element of the present invention's secondary filtering part is two AOTF, and (material that adopts is TeO to AOTF usually by the single axial birefringence crystal
2), be bonded in the piezoelectric transducer of uniaxial crystal one side, and the high-frequency signal source composition that acts on piezoelectric transducer.When AOTF has utilized sound wave in anisotropic medium, to propagate; To inciding the Bragg diffraction effect of the light in the propagation medium; Promptly incident multispectral carried out beam split; Ultrasound wave incident angle one timing when piezoelectric transducer (PZT) input; Corresponding definite ultrasonic frequency value; Unique incident light is arranged by diffraction, retaining falls the light of other parts, reaches the branch light action.Change ultrasonic frequency, the spectral scan effect is played in the also corresponding change of the optical wavelength of acousto-optic tunable filter diffraction like this.In the course of work, the computer control driver is regulated the radiofrequency signal that driver selects to be carried in two AOTF, offers two groups of radiofrequency signals with the spectral range different wave length of AOTF, makes its AOTF
1With AOTF
2Produce wavelength difference, satisfy the demand of secondary filtering, and then obtain narrower spectral width, improved the resolution of light spectrum image-forming.
Converged on the BCCD by the homogeneous beam of diffraction, BCCD is positioned on the focal plane of imaging and beam split part.Through the light signal irradiation BCCD of AOTF filtering, modulation is carried in the ultrasonic frequency on the AOTF, has obtained the spectrum picture cube metadata of object.When light beam process secondary filtering part, narrower spectral width is that light signal weakens accordingly, and traditional CCD can not reach desirable imaging effect; So BCCD that this patent adopts; It is low that it has a noise, and its working temperature can control, and has very high transmission efficiency.BCCD changes the light signal that the secondary filtering device transmits into electric signal; Again electric signal is passed to interface circuit; By interface circuit signal is passed to the PC control section; Whether the oneself detects its work normal, and the data processing software and the image analysis software of last PC control section are carried out identification of targets to be measured.
The secondary acousto-optic is adjustable filtering ultra-optical spectrum imaging method all is higher than the adjustable filtering light spectrum image-forming of single acousto-optic technology with device in temporal resolution, spatial resolution, can realize fast, the high precision spectral image data obtains.
Description of drawings
Accompanying drawing 1 is the adjustable filtering Hyper spectral Imaging of a secondary acousto-optic principle of device block diagram;
Accompanying drawing 2 is the adjustable secondary filtering schematic diagrams of acousto-optic;
Accompanying drawing 3 is the adjustable filtering ultra-optical spectrum imaging system of secondary acousto-optic process flow diagrams.
Embodiment
The first step: start computing machine, open control and management software.System accomplishes self check;
Second step: selected target, regulate optical system, make the system can blur-free imaging;
The 3rd step: according to spectral range to be measured and spectral accuracy, given two groups of ultrasonic frequencies;
The 4th step: the image of high-resolution spectroscopy clearly that obtains target;
The 5th step: spectrum picture is stored processing such as analysis.
Claims (7)
1. adjustable filtering ultra-optical spectrum imaging method of secondary acousto-optic and device, its characteristics are: be made up of light source, imaging moiety, the secondary acousto-optic is adjustable filtering part, BCCD and PC control section.
2. imaging moiety according to claim 1 is characterized in that: the reflected light of target to be measured is converged collimation incide in the secondary filtering device, make transmitted light satisfy filtering part incident demand, to improve the spectrum and the image resolution ratio of spectrum imaging system.
3. the adjustable filtering part of secondary acousto-optic according to claim 1; It is characterized in that: form by two acousto-optic tunable filters (AOTF); Piezoelectric transducer loads the ultrasonic signal of different frequency on each acousto-optic tunable filter, make it produce wavelength difference.
4. according to said two acousto-optic tunable filters of claim 3, it is characterized in that: the reflected light of target to be measured is incided AOTF
1, it tells+and 1 order diffraction light enters into AOTF
2, through AOTF
2Beam split once more, its AOTF
2+ the inciding among the BCCD of 1 order diffraction light.
5. ultrasonic signal according to claim 3 is characterized in that: the relation that is carried in two ultrasonic frequencies on the AOTF is by spectral range to be measured and the spectral resolution decision of drafting.As tuning AOTF
2The time, AOTF
1Diffraction light centre wavelength value fix, make it produce central wavelength difference.
6. acousto-optic tunable filter according to claim 3 is characterized in that: TeO is partly adopted in the adjustable beam split of acousto-optic
2As analyzing crystal, piezoelectric transducer is at TeO
2One end of crystal provides ultrasound wave, TeO
2The other end of crystal adds foamed sound absorber, and ultrasound wave is propagated to go the form of ripple in crystal.
7. BCCD according to claim 1 and PC control section; It is characterized in that: two groups of ultrasonic frequencies that computer control is corresponding with required wavelength with the output of management system; Act on piezoelectric transducer; The AOTF beam split; Obtain the spectrum picture of target to be measured; BCCD gathers image information, and last computing machine carries out data processing to the spectral information of target to be measured, has realized the analysis to the spectrum picture characteristic of target to be measured.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103728019A (en) * | 2013-12-19 | 2014-04-16 | 南京邮电大学 | Spectrum measurement device and method based on acousto-optic modulation |
| CN106596419A (en) * | 2017-01-10 | 2017-04-26 | 长春理工大学 | Testing system used for evaluating visible light smokescreen shading effect |
| CN107203055A (en) * | 2017-05-04 | 2017-09-26 | 金华职业技术学院 | A kind of light filter method for spectroscopic analysis system |
| CN107463009A (en) * | 2016-06-03 | 2017-12-12 | 徕卡显微系统复合显微镜有限公司 | For adjusting the method for beam intensity and affiliated Optical devices in Optical devices |
| CN108469693A (en) * | 2018-04-13 | 2018-08-31 | 中国科学院西安光学精密机械研究所 | Two-channel acousto-optic tunable filter and hyperspectral imaging device |
| CN108716951A (en) * | 2018-05-30 | 2018-10-30 | 福建师范大学 | A kind of high contrast Hyper spectral Imaging device |
| CN108896174A (en) * | 2018-04-02 | 2018-11-27 | 福建师范大学 | A kind of dispersion compensation device and its dispersion compensation method of Acousto-optic filtering diffraction light |
| CN108982378A (en) * | 2018-07-31 | 2018-12-11 | 浙江大学 | Plasma components spatial distribution method for real-time measurement and its device based on light spectrum image-forming |
| CN109781260A (en) * | 2019-02-19 | 2019-05-21 | 西安交通大学 | The fast illuminated polarization spectrum imaging detection device of ultra-compact and detection method |
| CN112815830A (en) * | 2020-12-30 | 2021-05-18 | 中国科学院西安光学精密机械研究所 | Double-filter lateral shearing interferometer and spectral imaging method based on same |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103728019A (en) * | 2013-12-19 | 2014-04-16 | 南京邮电大学 | Spectrum measurement device and method based on acousto-optic modulation |
| CN107463009A (en) * | 2016-06-03 | 2017-12-12 | 徕卡显微系统复合显微镜有限公司 | For adjusting the method for beam intensity and affiliated Optical devices in Optical devices |
| CN107463009B (en) * | 2016-06-03 | 2022-04-08 | 徕卡显微系统复合显微镜有限公司 | Method for adjusting the intensity of a light beam in an optical device and associated optical device |
| CN106596419A (en) * | 2017-01-10 | 2017-04-26 | 长春理工大学 | Testing system used for evaluating visible light smokescreen shading effect |
| CN106596419B (en) * | 2017-01-10 | 2023-02-03 | 长春理工大学 | Test system for evaluating shielding effect of visible light smoke screen |
| CN107203055A (en) * | 2017-05-04 | 2017-09-26 | 金华职业技术学院 | A kind of light filter method for spectroscopic analysis system |
| CN108896174A (en) * | 2018-04-02 | 2018-11-27 | 福建师范大学 | A kind of dispersion compensation device and its dispersion compensation method of Acousto-optic filtering diffraction light |
| CN108896174B (en) * | 2018-04-02 | 2023-11-24 | 福建师范大学 | Dispersion compensation device and dispersion compensation method for acousto-optic filtering diffracted light |
| CN108469693A (en) * | 2018-04-13 | 2018-08-31 | 中国科学院西安光学精密机械研究所 | Two-channel acousto-optic tunable filter and hyperspectral imaging device |
| CN108716951A (en) * | 2018-05-30 | 2018-10-30 | 福建师范大学 | A kind of high contrast Hyper spectral Imaging device |
| CN108982378A (en) * | 2018-07-31 | 2018-12-11 | 浙江大学 | Plasma components spatial distribution method for real-time measurement and its device based on light spectrum image-forming |
| CN109781260A (en) * | 2019-02-19 | 2019-05-21 | 西安交通大学 | The fast illuminated polarization spectrum imaging detection device of ultra-compact and detection method |
| CN109781260B (en) * | 2019-02-19 | 2020-04-28 | 西安交通大学 | Ultra-compact snapshot type polarization spectrum imaging detection device and detection method |
| CN112815830A (en) * | 2020-12-30 | 2021-05-18 | 中国科学院西安光学精密机械研究所 | Double-filter lateral shearing interferometer and spectral imaging method based on same |
| CN112815830B (en) * | 2020-12-30 | 2022-03-25 | 中国科学院西安光学精密机械研究所 | Double-filter lateral shearing interferometer and spectral imaging method based on same |
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Application publication date: 20120215 |