CN201464367U - Ultraviolet Raman spectrometer and light path adjusting device thereof - Google Patents
Ultraviolet Raman spectrometer and light path adjusting device thereof Download PDFInfo
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- CN201464367U CN201464367U CN2009201106968U CN200920110696U CN201464367U CN 201464367 U CN201464367 U CN 201464367U CN 2009201106968 U CN2009201106968 U CN 2009201106968U CN 200920110696 U CN200920110696 U CN 200920110696U CN 201464367 U CN201464367 U CN 201464367U
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- 238000001069 Raman spectroscopy Methods 0.000 title claims abstract description 71
- 238000001228 spectrum Methods 0.000 claims abstract description 102
- 238000003384 imaging method Methods 0.000 claims abstract description 47
- 230000001105 regulatory Effects 0.000 claims description 45
- 230000003287 optical Effects 0.000 claims description 18
- 230000003595 spectral Effects 0.000 claims description 15
- 230000000875 corresponding Effects 0.000 claims description 3
- 230000001678 irradiating Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 13
- 239000000463 material Substances 0.000 description 6
- 230000005540 biological transmission Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000001237 Raman spectrum Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000005338 frosted glass Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006011 modification reaction Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000004544 spot-on Substances 0.000 description 1
- 238000011179 visual inspection Methods 0.000 description 1
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Abstract
The utility model relates to an ultraviolet Raman spectrometer and a light path adjusting device thereof, wherein the light path adjusting device of the ultraviolet Raman spectrometer comprises an acquisition unit of a spectrum to be measured, a spectrum imaging plate, a shooting unit, an image monitoring unit, and a light path adjusting unit, wherein the acquisition unit of the spectrum to be measured acquires the converged spectrum to be measured by irradiating a sample through laser; an imaging surface marked with coordinates is arranged the spectrum imaging plate, receives the spectrum to be measured transmitted by the acquisition unit of the spectrum to be measured and presents an image of the spectrum to be measured; the shooting unit shoots images of the imaging surface marked with coordinates and the spectrum to be measured; and the image monitoring unit is connected with the shooting unit and displays the images of the imaging surface marked with coordinates and the spectrum to be measured, which are shot by the shooting unit. By monitoring the size and the shape of light spots through the light path adjusting unit of the ultraviolet Raman spectrometer, the utility model realizes the light adjustment on Raman scattered light.
Description
Technical field
The utility model is about Raman spectroscopy, especially in regard to a kind of ultraviolet Raman spectrometer light path regulating device and ultraviolet Raman spectrometer.
Background technology
Raman spectrum is an important modern optical spectral technology, and it is widely used in chemistry, physics, and fields such as biology and material science are the strong instruments of identifying material molecular structure.
Ultraviolet Raman spectrometer generally is made up of ultraviolet laser light emitting source, light path system, beam splitting system, signals collecting and data handling system.The performance of Raman spectrometer is decided by the performance of laser instrument light emitting source, light path system, beam splitting system, signals collecting and data handling system respectively.And in actual use, the performance of laser instrument, beam splitting system, signals collecting and data handling system is relatively stable, need not adjust usually, the general adjustment light path system that only needs.Light path system comprises laser optical path and collects light path; Laser optical path is that exciting light is focused on the sample, is the Raman diffused light of sample to be collected the back import beam splitting system and collect light path.Because Raman diffused light is an invisible light, so can not be by the adjusting of visual inspection light path system.
In the prior art paper-like materials is put into light path, utilize ultraviolet light can produce the characteristic of visible blue on paper-like materials, monitoring optical path is with the naked eye carried out light path and is regulated.But paper-like materials can only make the ultraviolet Raman diffused light of collecting can not accurately converge at the entrance port of spectrometer infinitely near the entrance port of spectrometer; And this scheme can not be carried out in the darkroom, will be placed on contradiction in the darkroom with the light path system of ultraviolet Raman spectrometer; Have, human eye can't accurately be judged light intensity again.
Prior art also adopts the method for the Raman scattering light signal that reads signals collecting and data handling system, regulates light path by supervisory signal intensity.This scheme must be feasible below the prerequisite that can measure signal, otherwise can't judge that the no signal of sample own still is that light path is not adjusted; And since usually the Raman scattering light signal very a little less than, the signals collecting time of some sample can reach a few minutes, adjusts the light path excessive cycle for this type of sample by this scheme.
Summary of the invention
The purpose of this utility model is to provide a kind of ultraviolet Raman spectrometer light path regulating device and ultraviolet Raman spectrometer, to realize the light path adjusting to Raman diffused light.
To achieve these goals, the utility model provides a kind of ultraviolet Raman spectrometer light path regulating device, and described ultraviolet Raman spectrometer light path regulating device comprises: spectrum acquiring unit to be measured, obtain the spectrum to be measured that converges behind the laser radiation sample; The light spectrum image-forming plate has an imaging surface that indicates coordinate, and the described imaging surface that indicates coordinate receives the spectrum to be measured that described spectrum acquiring unit to be measured is sent, and presents the image of described spectrum to be measured; Image unit absorbs the described imaging surface of coordinate and the image of spectrum to be measured of indicating; The image monitoring unit is connected with described image unit, and the imaging surface that indicates coordinate of described image unit picked-up and the image of spectrum to be measured are shown.
To achieve these goals, the utility model also provides a kind of ultraviolet Raman spectrometer, and described ultraviolet Raman spectrometer comprises: described ultraviolet Raman spectrometer comprises: LASER Light Source, laser optical path device, light path gathering-device and light-dividing device; Described LASER Light Source emitted laser is passed through the entrance port that described laser optical path device and light path gathering-device are transmitted into described light-dividing device successively; Described ultraviolet Raman spectrometer also comprises: light path regulating device, and wherein, described light path regulating device comprises: spectrum acquiring unit to be measured, obtain the spectrum to be measured that converges behind the described light path gathering-device emitted laser irradiation sample; The light spectrum image-forming plate has an imaging surface that indicates coordinate, and the described imaging surface that indicates coordinate receives the spectrum to be measured that described spectrum acquiring unit to be measured is sent, and presents the image of described spectrum to be measured; Image unit absorbs the described imaging surface of coordinate and the image of spectrum to be measured of indicating; The image monitoring unit is connected with described image unit, and the imaging surface that indicates coordinate of described image unit picked-up and the image of spectrum to be measured are shown.
Useful technique effect of the present utility model: the Rayleigh scattering light intensity of utilizing Ultra-Violet Laser to get to produce on the sample very high and and the characteristics with identical optical transmission property, monitor the size and the shape of hot spot by the ultraviolet Raman spectrometer light path regulating device, light path system is regulated, realized the light path of Raman diffused light is regulated.
Description of drawings
Fig. 1 is the structural representation of existing ultraviolet Raman spectrometer;
Fig. 2 is the structural representation of the utility model ultraviolet Raman spectrometer light path regulating device;
Fig. 3 is the structural representation of ultraviolet Raman spectrometer of the present utility model;
Fig. 4 is the structural representation of the utility model light spectrum image-forming;
Fig. 5 is the spectral image synoptic diagram on the fluorescent plate;
Fig. 6 is the image taking and the transmission synoptic diagram of the utility model CCD camera;
The photographic images synoptic diagram that Fig. 7 shows for the utility model computing machine;
Fig. 8 regulates the photographic images synoptic diagram finish back computing machine demonstration for the utility model light path system;
Fig. 9 is the synoptic diagram that the utility model moves into the spectrum acquiring unit light path system;
Figure 10 is the synoptic diagram that the utility model moves into the spectrum acquiring unit light path system;
Figure 11 is the method flow diagram of the utility model embodiment.
Embodiment
Below in conjunction with the accompanying drawing among the utility model embodiment, the technical scheme among the utility model embodiment is clearly and completely described, obviously, described embodiment only is the utility model part embodiment, rather than whole embodiment.Based on the embodiment in the utility model, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the utility model protection.
Fig. 1 is the structural representation of existing ultraviolet Raman spectrometer; As shown in Figure 1, ultraviolet Raman spectrometer comprises LASER Light Source 101, light path system (laser optical path device 102, light path gathering-device 103) and light-dividing device 104, and ultraviolet Raman spectrometer also comprises signal pickup assembly.LASER Light Source 101 is generally ultraviolet laser, and the Ultra-Violet Laser from LASER Light Source 101 produces passes through laser optical path device 102, light path gathering-device 103, light-dividing device 104 and signal pickup assembly successively.Generally, LASER Light Source 101 in the ultraviolet Raman spectrometer, light light-dividing device 104 and signal pickup assembly do not need to regulate, the quality that light path system is regulated is the performance of decision ultraviolet Raman spectrometer directly, the adjusting of existing light path system can not guarantee light path gathering-device 103 with the entrance port of spectral emissions to be measured to light-dividing device 104, and it is the strongest to guarantee that light path gathering-device 103 is transmitted into the spectral intensity to be measured of light-dividing device 104 entrance ports.
For the accurate light path system of regulating, the utility model provides a kind of ultraviolet Raman spectrometer light path regulating device, as shown in Figure 2, described ultraviolet Raman spectrometer light path regulating device comprises: spectrum acquiring unit 201 to be measured, obtain the spectrum to be measured that converges behind the laser radiation sample; Light spectrum image-forming plate 202 has an imaging surface that indicates coordinate, and the described imaging surface that indicates coordinate receives the spectrum to be measured that described spectrum acquiring unit to be measured is sent, and presents the image of described spectrum to be measured; Image unit 203 absorbs the described imaging surface of coordinate and the image of spectrum to be measured of indicating; Image monitoring unit 204 is connected with described image unit, and the imaging surface that indicates coordinate of described image unit picked-up and the image of spectrum to be measured are shown.
Spectrum acquiring unit 201 to be measured can comprise reflector, and light spectrum image-forming plate 202 can be fluorescent plate (Ultraluminescence plate), and described fluorescent plate is the frosted glass that is coated with ultraviolet fluorescence powder, and above have coordinate.Described image unit 203 can be the CCD camera, can also be other detector except the CCD camera.Described image monitoring unit can be a computing machine.
Fig. 3 is the structural representation of ultraviolet Raman spectrometer of the present utility model; Described ultraviolet Raman spectrometer comprises: LASER Light Source 101, laser optical path device 102, light path gathering-device 103 and light-dividing device 104; Described LASER Light Source 101 emitted laser are passed through the entrance port that described laser optical path device 102 and light path gathering-device 103 are transmitted into described light-dividing device 104 successively; Described ultraviolet Raman spectrometer also comprises: light path regulating device, and wherein, described light path regulating device comprises: spectrum acquiring unit 201 to be measured, obtain the spectrum to be measured that converges behind the laser radiation sample; Light spectrum image-forming plate 202, has an imaging surface that indicates coordinate, the described imaging surface that indicates coordinate receives the spectrum to be measured that described spectrum acquiring unit to be measured is sent, and presenting the image of described spectrum to be measured, coordinate is corresponding to the position relation of described entrance port with spectral emissions to be measured with the position relation of image on the imaging surface; Image unit 203 absorbs the described imaging surface of coordinate and the image of spectrum to be measured of indicating; Image monitoring unit 204 is connected with described image unit, and the imaging surface that indicates coordinate of described image unit picked-up and the image of spectrum to be measured are shown.
Light path is regulated personnel and is regulated described light path gathering-device with the position of spectral emissions to be measured to the entrance port of described light-dividing device according to the coordinate of image monitoring unit demonstration and the position relation of image.
Described ultraviolet Raman spectrometer also comprises: motorized precision translation stage, described motorized precision translation stage and described light path regulating device are coupled, and described light path regulating device are moved into or shifts out the light path between described light path gathering-device and the light-dividing device.
Ultraviolet Raman spectrometer is Ultra-Violet Laser to be got to the Raman scattering light signal that produces on the sample analyze, and identifies the architectural characteristic of material molecule.Ultra-Violet Laser through laser optical path with laser radiation to testing sample, can produce the Raman scattering light signal after the sample Stimulated Light irradiation, also have very strong Rayleigh scattering light signal simultaneously.The Raman scattering light wavelength is different with exciting light, and specifically by the characteristic decision of sample, Rayleigh scattering is then identical with excitation wavelength irrelevant with sample, and the intensity of Rayleigh scattering is than the high several magnitude of intensity of Raman scattering.Rayleigh scattering is identical with Raman scattering other optical characteristics except that having any different on wavelength and intensity, so the collection light path of Raman spectrometer can all be collected two kinds of scattered light signals.And Rayleigh scattering can produce interference to the measurement of Raman scattering in test, so Raman spectrometer all can be eliminated the interference of Rayleigh scattering as far as possible, method therefor has two kinds: the one, increase notch filter sheet (notch filter) filtering Rayleigh scattering light in the porch of spectrometer; Another kind of scheme is to carry out repeatedly beam split with the multi-cascade spectrometer to eliminate the influence of Rayleigh scattering to test.But, the intensity height of Rayleigh scattering, and after collecting light path, have the characteristics of identical optical transmission property with Raman scattering, we utilize the above-mentioned characteristic of Rayleigh scattering just, by the ultraviolet Raman spectrometer light path regulating device Rayleigh scattering is analyzed, the light path of Raman diffused light is regulated to finish.
Comprise reflector with spectrum acquiring unit 201 to be measured below, the light spectrum image-forming plate is a fluorescent plate, and image unit 203 is that the CCD camera is that example illustrates embodiment of the present utility model.
Fig. 4 is the structural representation of the utility model light spectrum image-forming; As shown in Figure 4, LASER Light Source 101 emitted laser successively through described laser optical path device 102 and light path gathering-device 103 produce spectral emissions to be measured to the entrance port 403. of described light-dividing device 104 before spectrum to be measured enters light-dividing device 104, obtained by spectrum acquiring unit 201 to be measured, the reflector 401 of spectrum acquiring unit 201 to be measured with spectral reflectance to be measured to fluorescent plate plate 402, has an imaging surface that indicates coordinate on the fluorescent plate plate 402, the described imaging surface that indicates coordinate receives the spectrum to be measured that described spectrum acquiring unit to be measured is sent, and present the image of described spectrum to be measured, the image of described spectrum to be measured is shown as a hot spot at fluorescent plate. and Fig. 5 is the spectral image synoptic diagram on the imaging surface of fluorescent plate, as shown in Figure 5, on the imaging surface of fluorescent plate coordinate is arranged, coordinate can be represented the position and the size of hot spot.
On fluorescent plate, generate after the hot spot, utilize the CCD camera to take the image of spectral image, and the image of taking is transferred to computing machine, to show the image of taking.Fig. 6 is the image taking and the transmission synoptic diagram of the utility model CCD camera, and as shown in Figure 6, CCD camera 601 is taken the hot spot among Fig. 5, then the image of the hot spot taken is transferred to computing machine 602 and shows.
The photographic images synoptic diagram that Fig. 7 shows for the utility model computing machine, the coordinate on the described imaging surface is corresponding to the position relation of described entrance port with the position of image relation and spectral emissions to be measured.When placing light path regulating device in the light path between light path gathering-device and light-dividing device (light path), the center of the coordinate on the imaging surface will become mirror with the beam-splitter strictness with the center of light-dividing device entrance port, could guarantee like this that when the image of spectrum is positioned at the center of the coordinate on the imaging surface spectrum to be measured that light path gathering-device 103 is transmitted into the entrance port 403 of light-dividing device 104 can enter the entrance port 403 of light-dividing device 104 fully.
Light path is regulated personnel and is regulated described light path gathering-device with the position of spectral emissions to be measured to the entrance port 403 of described light-dividing device according to the coordinate of computing machine 602 demonstrations and the position relation of image.As described in Figure 7, the hot spot that shows on the computer screen is not or not the center of fluorescent plate, and light path is regulated personnel and need be adjusted light path, up to the center of hot spot coordinate on imaging surface, and hot spot minimum (hot spot is more little, and light intensity is strong more).As shown in Figure 8, adjust spot size and position afterwards for light path.
Ultraviolet Raman spectrometer also comprises: motorized precision translation stage, described motorized precision translation stage and described light path regulating device are coupled, and described light path regulating device are moved into or shifts out the light path between light path gathering-device 103 and the light-dividing device 104.When the commissioning staff carries out the light path adjusting, be by motorized precision translation stage with the light path between spectrum acquiring unit 201 immigration light path gathering-devices 103 to be measured and the light-dividing device 104, to obtain spectrum to be measured.The utility model can also move into spectrum acquiring unit 201 to be measured and light spectrum image-forming plate 202 light path between light path gathering-device 103 and the light-dividing device 104 together, and purpose all is in order to obtain spectrum to be measured, is not in order to limit the utility model.By the computer control electric machine controller, the motor on the motor controller controls motorized precision translation stage makes motorized precision translation stage along the light path between guide rail immigration light path gathering-device 103 and the light-dividing device 104.To be the utility model move into the synoptic diagram of light path with the spectrum acquiring unit to Fig. 9, and spectrum acquiring unit 201 to be measured (comprising reflector 901) and light spectrum image-forming plate 202 (fluorescent plate 902) are together moved into light path between light path gathering-device 103 and the light-dividing device 104.
After the commissioning staff finishes light path and regulates, spectrum acquiring unit 201 to be measured is shifted out light path between light path gathering-device 103 and the light-dividing device 104 by motorized precision translation stage.By the computer control electric machine controller, the motor on the motor controller controls motorized precision translation stage makes motorized precision translation stage shift out light path between light path gathering-device 103 and the light-dividing device 104 along guide rail.Figure 10 is the synoptic diagram that the utility model moves into the spectrum acquiring unit light path.
Figure 11 is the method flow diagram of the utility model embodiment, and as shown in figure 11, described method may further comprise the steps:
Step S1101: with the light path between spectrum acquiring unit 201 immigration light path gathering-devices 103 to be measured and the light-dividing device 104.
Light path adjusting personnel carry out before the adjusting of light path system, will be by motorized precision translation stage with the light path between spectrum acquiring unit 201 immigration light path gathering-devices 103 to be measured and the light-dividing device 104, to obtain spectrum to be measured. by the computer control electric machine controller, motor on the motor controller controls motorized precision translation stage makes motorized precision translation stage along the light path between guide rail immigration light path gathering-device 103 and the light-dividing device 104.
Step S1102: the spectral reflectance to be measured that the reflector 401 of spectrum acquiring unit 201 to be measured will obtain is to the imaging surface of light spectrum image-forming plate 202 fluorescent plates.
Step S1103: the spectrum to be measured of reflection generates the image of spectrum to be measured on the imaging surface of fluorescent plate.
The image of spectrum to be measured is shown as a hot spot at fluorescent plate, comprises coordinate on the imaging surface, and coordinate can be represented the position and the size of this hot spot.
Step S1104:CCD camera is taken the image of spectrum to be measured and is indicated the image of the imaging surface of coordinate, and image is transferred to computing machine.
On the imaging surface of fluorescent plate, generate after the hot spot, utilize the CCD camera to take the image of spectrum to be measured and indicate the image of the imaging surface of coordinate, and the image of taking is transferred to computing machine, to show the image of taking.
Step S1105: computing machine shows the image that the CCD camera is taken.
Step S1106: according to the image adjustment light path system of computing machine demonstration.
The hot spot that shows on the computer screen is the center of coordinate on imaging surface not, and the diameter of hot spot may not be minimum, and light path is regulated personnel and need be adjusted light path, and the hot spot on imaging surface is at the center of coordinate, and the hot spot minimum.
Step S1107: spectrum acquiring unit 201 to be measured is shifted out light path between light path gathering-device 103 and the light-dividing device 104.
After light path system is regulated and to be finished, spectrum acquiring unit 201 to be measured is shifted out light path between light path gathering-device 103 and the light-dividing device 104, prevent that spectrum acquiring unit 201 to be measured from stopping that spectrum to be measured enters the entrance port of light-dividing device.
Utilize the ultraviolet Raman spectrometer light path regulating device to regulate and finish after the light path, the spectrum to be measured that light path gathering-device 103 produces just can enter in the entrance port of light-dividing device 104 fully, and the light intensity of spectrum to be measured is the strongest at this moment.
Useful technique effect of the present utility model: the Rayleigh scattering light intensity of utilizing Ultra-Violet Laser to get to produce on the sample very high and and the characteristics with identical optical transmission property, monitor the size and the shape of hot spot by the ultraviolet Raman spectrometer light path regulating device, light path system is regulated, realized the light path of Raman diffused light is regulated.
Above-described embodiment; the purpose of this utility model, technical scheme and beneficial effect are further described; institute is understood that; the above only is an embodiment of the present utility model; and be not used in and limit protection domain of the present utility model; all within spirit of the present utility model and principle, any modification of being made, be equal to replacement, improvement etc., all should be included within the protection domain of the present utility model.
Claims (8)
1. a ultraviolet Raman spectrometer light path regulating device is characterized in that, described ultraviolet Raman spectrometer light path regulating device comprises:
Spectrum acquiring unit to be measured obtains the spectrum to be measured that converges behind the laser radiation sample;
The light spectrum image-forming plate has an imaging surface that indicates coordinate, and the described imaging surface that indicates coordinate receives the spectrum to be measured that described spectrum acquiring unit to be measured is sent, and presents the image of described spectrum to be measured;
Image unit absorbs the described imaging surface of coordinate and the image of spectrum to be measured of indicating;
The image monitoring unit is connected with described image unit, and the imaging surface that indicates coordinate of described image unit picked-up and the image of spectrum to be measured are shown.
2. ultraviolet Raman spectrometer light path regulating device as claimed in claim 1 is characterized in that, described light spectrum image-forming plate is a fluorescent plate.
3. ultraviolet Raman spectrometer light path regulating device as claimed in claim 1 is characterized in that, described image unit is the CCD camera.
4. ultraviolet Raman spectrometer light path regulating device as claimed in claim 1 is characterized in that, described image monitoring unit is a computing machine.
5. ultraviolet Raman spectrometer, described ultraviolet Raman spectrometer comprises: LASER Light Source, laser optical path device, light path gathering-device and light-dividing device; Described LASER Light Source emitted laser is passed through the entrance port that described laser optical path device and light path gathering-device are transmitted into described light-dividing device successively; It is characterized in that described ultraviolet Raman spectrometer also comprises: light path regulating device, wherein, described light path regulating device comprises:
Spectrum acquiring unit to be measured obtains the spectrum to be measured that converges behind the described light path gathering-device emitted laser irradiation sample;
The light spectrum image-forming plate has an imaging surface that indicates coordinate, and the described imaging surface that indicates coordinate receives the spectrum to be measured that described spectrum acquiring unit to be measured is sent, and presents the image of described spectrum to be measured;
Image unit absorbs the described imaging surface of coordinate and the image of spectrum to be measured of indicating;
The image monitoring unit is connected with described image unit, and the imaging surface that indicates coordinate of described image unit picked-up and the image of spectrum to be measured are shown.
6. ultraviolet Raman spectrometer as claimed in claim 5 is characterized in that, the coordinate on the described imaging surface is corresponding to the position relation of described entrance port with the position of image relation and spectral emissions to be measured.
7. ultraviolet Raman spectrometer as claimed in claim 5 is characterized in that, regulates described light path gathering-device with the position of spectral emissions to be measured to the entrance port of described light-dividing device according to the coordinate of image monitoring unit demonstration and the position relation of image.
8. ultraviolet Raman spectrometer as claimed in claim 5, it is characterized in that, described ultraviolet Raman spectrometer also comprises: motorized precision translation stage, described motorized precision translation stage and described light path regulating device are coupled, and described light path regulating device are moved into or shifts out the light path between described light path gathering-device and the light-dividing device.
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| CN2009201106968U CN201464367U (en) | 2009-08-06 | 2009-08-06 | Ultraviolet Raman spectrometer and light path adjusting device thereof |
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| CN2009201106968U CN201464367U (en) | 2009-08-06 | 2009-08-06 | Ultraviolet Raman spectrometer and light path adjusting device thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103983604A (en) * | 2014-05-28 | 2014-08-13 | 中国石油大学(北京) | Detection system based on terahertz time-domain spectroscopy technique |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103983604A (en) * | 2014-05-28 | 2014-08-13 | 中国石油大学(北京) | Detection system based on terahertz time-domain spectroscopy technique |
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