CN202676595U - Two-dimensional imaging device based on thermal lens effect - Google Patents
Two-dimensional imaging device based on thermal lens effect Download PDFInfo
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- CN202676595U CN202676595U CN 201220283067 CN201220283067U CN202676595U CN 202676595 U CN202676595 U CN 202676595U CN 201220283067 CN201220283067 CN 201220283067 CN 201220283067 U CN201220283067 U CN 201220283067U CN 202676595 U CN202676595 U CN 202676595U
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Abstract
The utility model discloses a two-dimensional imaging device based on a thermal lens effect. The two-dimensional imaging device based on the thermal lens effect comprises a pump light source and a probe light source, wherein a probe light spatial filter, a probe light optical filter and a photoelectric detector are sequentially located at the back ends of the pump light source and the probe light source, a pump light diffraction light-splitting device, a color selective mirror and a focusing imaging lens are sequentially located between the pump light source and a spatial filter to-be-tested sample, a probe light diffraction light-splitting device, a color selective mirror and a focusing imaging lens are sequentially located between the probe light source and the spatial filter to-be-tested sample. The two-dimensional imaging device based on the thermal lens effect is higher in imaging speed compared with the traditional method that the sample is scanned point by point. Due to the facts that the sample does not need scanning point by point, and a component does not need moving in imaging detection, and therefore the two-dimensional imaging device based on the thermal lens effect facilitates the improvement of the stability of an instrument, reduces cost, is further miniaturized and widens the application scope.
Description
Technical field
The utility model relates to and utilizes thermal lensing effect to detect and imaging field, and particularly a kind of two-dimentional multiple beam of diffraction light-dividing device light splitting that utilizes excites the thermal lens imaging device.
Background technology
When light beam (hereinafter referred to as pump light) process material, material can raise because the absorption optical energy cause local temperature, thereby the local indexes of refraction that causes material changes.Because the variation of refractive index, material can produce the light of propagating therein and assemble or the effect such as disperse, and are equivalent to increase newly lens, thereby are referred to as thermal lensing effect.In this thermal lensing effect, the variation of the Refractive Index of Material that photoinduction produces, its space distribution and being closely related with pump light parameter and material behavior over time, utilize thermal lensing effect to carry out determination and analysis to material behavior, this measuring method is a kind of highly sensitive, contactless measuring technique.
The most common method of utilizing thermal lensing effect to carry out the material behavior detection is to utilize a branch of relatively strong pump light through sample and excite therein thermal lensing effect, another restraints relatively weak detection light also through producing the zone of thermal lensing effect in the material simultaneously, surveying light can have certain angle with pump light, also can be coaxial.When surveying light by the light activated thermal lens of pumping zone, its spatial characteristic will change, and produces newly-increased convergence or effect weakening.Survey the convergence of light or the variation of divergence characterization by detecting outgoing, just can obtain to produce the material behavior in thermal lensing effect zone.
Because the variation of the caused detection radiation of light of thermal lensing effect characteristic usually can add a spatial filter and detects by survey appropriate location in the light light path in outgoing, spatial filter allows part to survey luminous energy and enters photodetector.When pump light excites thermal lensing effect, thereby cause that surveying light produces newly-increased convergence or disperse, the luminous energy that enters into photodetector through spatial filter like this will change accordingly.The detection luminous energy that the thermal lensing effect of utilizing this method to detect causes changes generally fainter, especially when sample is weak absorbing material.Therefore, generally need to utilize phaselock technique to detect in the practical application.When needs obtain the two dimensional image of specimen material characteristic, then be to obtain by sample is carried out point by point scanning.This two-dimensional scan formation method can obtain higher resolution, is similar under the far-field measurement condition and is subject to pump light/detection diffraction of light limit, than being easier to reach sub-micrometer scale.
But this traditional two-dimensional scan formation method is greatly limited in actual applications.Main cause is that the speed of imaging is too slow.Be because measuring-signal is fainter on the one hand, obtain good signal to noise ratio (S/N ratio), just need to carry out to each measurement point the phase-locked integration of certain hour; On the other hand, carry out point by point scanning, whenever moving to next measurement point all needs to spend certain movement and stand-by period, the particularly latter, and this is in order to make whole system can both reach the new accuracy of balance to guarantee to measure from the mechanical shock to the local temperature.The very slow shortcoming of this image taking speed has greatly limited the application of thermal lens imaging technique.
The utility model content
The technical problems to be solved in the utility model provides a kind of two-dimension imaging apparatus based on thermal lensing effect, solves in the thermal lens application needing in the two-dimensional imaging process to carry out point by point scanning formation method long problem consuming time.
The technical solution of the utility model is:
A kind of two-dimension imaging apparatus based on thermal lensing effect, include pump light source and probe source, be positioned at detection light spatial filter, detection light optical filter and photodetector that pump light source and probe source rear end arrange in turn, from described pump light source to being disposed with pump light diffraction light-dividing device, dichronic mirror and focal imaging lens between the spatial filter testing sample; Survey optical diffraction light-dividing device, dichronic mirror and focal imaging lens from described probe source to being disposed with between the spatial filter testing sample.
Be provided with the array photomodulator between described pump light diffraction light-dividing device and the dichronic mirror, described photodetector is photodetector array or a photodetector.
Be provided with first between described detection optical diffraction light-dividing device and the spectroscope and survey light adjustment lens; Be provided with second between described focal imaging lens and the described spatial filter and survey light adjustment lens.
Be provided with between described detection light optical filter and the photodetector and survey the light convergent lens.
Be provided with pump light between described pump light diffraction light-dividing device and the array photomodulator and adjust lens.
The utility model on image taking speed than traditional sample point by point scanning method is improved a lot, in addition owing to need not to carry out point by point scanning, concrete detection and Image-forming instrument design can avoid using moving-member, are conducive to improve stability, reduction cost, further miniaturization and the broaden application field of instrument.
Description of drawings
Fig. 1 is the structural representation of the utility model embodiment.
Embodiment
See Fig. 1, a kind of two-dimension imaging apparatus based on thermal lensing effect, include pump light source 1, probe source 2, be positioned at pump light source 1, probe source 2, be arranged at the dichronic mirror 3 of pump light source 1 and probe source 2 rear ends, be arranged in turn pump light source 1 to the pump light diffraction light-dividing device 4 between dichronic mirror 3 one input ends, pump light is adjusted lens 5 and array photomodulator 6, be arranged in turn probe source 2 to the detection optical diffraction light-dividing device 7 between dichronic mirror 3 another input ends and first and survey light and adjust lens 8, be arranged in turn the focal imaging lens 9 behind dichronic mirror 3 output terminals, second surveys light adjusts lens 10, survey light spatial filter 11, survey light optical filter 12, survey light convergent lens 13 and photodetector 14.Survey acting as of light optical filter 12 and block parasitic light, only have in theory the light of detection to pass through.
See Fig. 1, a kind of two-dimensional imaging method based on thermal lensing effect: may further comprise the steps:
(1), sample 15 being positioned over focal imaging lens 9 and second surveys between the light adjustment lens 10;
(2), be divided into aplanatic, as to be equidistant array distribution pump beam group behind the pump beam process pump light diffraction light-dividing device 4 that pump light source 1 is sent; The pump beam group obtains modulation after adjusting lens 5, array photomodulator 6 through pump light successively, and the modulating frequency of every light beam is different; After pump beam group process dichronic mirror 3 transmissions after the modulation and by shining behind the focal imaging lens 9 on the sample 15;
(3), the detecting light beam that is sent by probe source 9 is divided into aplanatic, as to be equidistant array distribution detecting light beam group after surveying optical diffraction light-dividing device 7, after the detecting light beam group is surveyed light adjustment lens 8 through first, by dichronic mirror 3 reflections, and converged on the sample 15 by focal imaging lens 9, and every a branch of detection light of detecting light beam group zone to be measured on sample all spatially overlaps with every a branch of pump light of pump beam group;
(4), the detecting light beam group that sees through sample 15 surveys light through second again and adjusts lens 10, surveys light spatial filter 11 and survey light optical filter 12, assemble and enter photodetector 14 and record Two-Dimensional Heat lens signal image by surveying light convergent lens 13.Concrete imaging testing process is: the pump beam group after 6 modulation of array photomodulator shines the zone to be measured of sample 15, and every a branch of pump light has caused the variation of corresponding sample refractive index at sample 15 irradiation areas; Because the variation of this refractive index, the propagation characteristic of this regional detecting light beam group of process can change, and produces newly-increased convergence or effect weakening; Because convergence or effect weakening that these are newly-increased, the energy that enters the detection light of photodetector through surveying the light spatial filter can change accordingly; The variation of this energy is relevant with the variation of sample refractive index, just can obtain the variation of sample refractive index by measuring the variation of surveying luminous energy, thereby obtains the material behavior of sample.When adopting single photodetector, the signal of acquisition is the stack of whole detecting light beam group.Utilize phase-locked detection technique to survey the output signal of photodetector.At this moment, with the reference signal of the AC signal identical with the modulating frequency of a certain modulated pump beam as phase-locked detection, only have like this this pump beam to induce the reflectance varies signal of generation to be measured by lock-in amplifier, other pump beam induces the signal of generation all to be filtered.Change successively the frequency of reference signal, just can obtain the signal that corresponding pump beam is induced generation.According to numbering and the corresponding signal that records of pump beam, obtain the two dimensional image of spatial discrimination again.
Also can utilize the every a branch of detecting light beam of a plurality of analog to digital converters or lock-in amplifier to carry out parallel measurement in actual the use, change successively the time that reference signal is measured to save, further improve image taking speed.
Also can adopt photodetector array to survey the Optical thermo lens signal.Every a branch of detection light enters respectively a photodetector.Every bit on the signal counter sample on each photodetector can be identical to the modulating frequency of pump light in this case like this, also can be different.At detecting terminal, utilize parallel processing circuit to process, just can the thermal lens signal (pixel) that every a branch of pump light causes be distinguished.
Claims (5)
1. two-dimension imaging apparatus based on thermal lensing effect, include pump light source and probe source, be positioned at detection light spatial filter, detection light optical filter and photodetector that pump light source and probe source rear end arrange in turn, it is characterized in that: from described pump light source to being disposed with pump light diffraction light-dividing device, dichronic mirror and focal imaging lens between the spatial filter testing sample; Survey optical diffraction light-dividing device, dichronic mirror and focal imaging lens from described probe source to being disposed with between the spatial filter testing sample.
2. a kind of two-dimension imaging apparatus based on thermal lensing effect according to claim 1, it is characterized in that: be provided with the array photomodulator between described pump light diffraction light-dividing device and the dichronic mirror, described photodetector is photodetector array or a photodetector.
3. a kind of two-dimension imaging apparatus based on thermal lensing effect according to claim 1 is characterized in that: be provided with first between described detection optical diffraction light-dividing device and the spectroscope and survey light adjustment lens; Be provided with second between described focal imaging lens and the described spatial filter and survey light adjustment lens.
4. a kind of two-dimension imaging apparatus based on thermal lensing effect according to claim 1 is characterized in that: be provided with between described detection light optical filter and the photodetector and survey the light convergent lens.
5. a kind of two-dimension imaging apparatus based on thermal lensing effect according to claim 2 is characterized in that: be provided with pump light between described pump light diffraction light-dividing device and the array photomodulator and adjust lens.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201220283067 CN202676595U (en) | 2012-06-15 | 2012-06-15 | Two-dimensional imaging device based on thermal lens effect |
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| CN 201220283067 CN202676595U (en) | 2012-06-15 | 2012-06-15 | Two-dimensional imaging device based on thermal lens effect |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102692394A (en) * | 2012-06-15 | 2012-09-26 | 合肥知常光电科技有限公司 | Two-dimensional imaging method and device based on thermal lens effect |
| CN103712993A (en) * | 2013-12-26 | 2014-04-09 | 无锡利弗莫尔仪器有限公司 | Method and device for detecting three-dimensional distribution of absorption characteristics in transparent optical material body |
| CN103712949A (en) * | 2013-12-26 | 2014-04-09 | 无锡利弗莫尔仪器有限公司 | Photo-thermal absorption spectrum technology-based cooking oil detection method and photo-thermal absorption spectrum technology-based cooling oil detection device |
| CN108226040A (en) * | 2018-01-12 | 2018-06-29 | 南开大学 | A kind of assay method and device of two-dimensional material photo-thermal effect |
-
2012
- 2012-06-15 CN CN 201220283067 patent/CN202676595U/en not_active Withdrawn - After Issue
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102692394A (en) * | 2012-06-15 | 2012-09-26 | 合肥知常光电科技有限公司 | Two-dimensional imaging method and device based on thermal lens effect |
| CN102692394B (en) * | 2012-06-15 | 2015-03-11 | 合肥知常光电科技有限公司 | Two-dimensional imaging method and device based on thermal lens effect |
| CN103712993A (en) * | 2013-12-26 | 2014-04-09 | 无锡利弗莫尔仪器有限公司 | Method and device for detecting three-dimensional distribution of absorption characteristics in transparent optical material body |
| CN103712949A (en) * | 2013-12-26 | 2014-04-09 | 无锡利弗莫尔仪器有限公司 | Photo-thermal absorption spectrum technology-based cooking oil detection method and photo-thermal absorption spectrum technology-based cooling oil detection device |
| CN103712993B (en) * | 2013-12-26 | 2016-08-17 | 无锡利弗莫尔仪器有限公司 | The detection method of transparent optical material body absorption characteristic distributed in three dimensions and device |
| CN108226040A (en) * | 2018-01-12 | 2018-06-29 | 南开大学 | A kind of assay method and device of two-dimensional material photo-thermal effect |
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| C14 | Grant of patent or utility model | ||
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Granted publication date: 20130116 Effective date of abandoning: 20150311 |
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| RGAV | Abandon patent right to avoid regrant |