CN203299111U - Terahertz time domain transmission and reflection in-situ conversion detection system - Google Patents
Terahertz time domain transmission and reflection in-situ conversion detection system Download PDFInfo
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- CN203299111U CN203299111U CN2013203621936U CN201320362193U CN203299111U CN 203299111 U CN203299111 U CN 203299111U CN 2013203621936 U CN2013203621936 U CN 2013203621936U CN 201320362193 U CN201320362193 U CN 201320362193U CN 203299111 U CN203299111 U CN 203299111U
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Abstract
The utility model relates to a terahertz time domain transmission and reflection in-situ conversion detection system. The detection system comprises a first light path transmission device and a second light path transmission device. The first light path transmission device comprises a first off-axis parabolic mirror, the second light path transmission device comprises a detection device, and a transmission and reflection conversion light path transmission device is arranged between the first off-axis parabolic mirror and the detection device. By means of the detection system, in-situ measurement and mutual conversion in transmission and reflection modes can be achieved in the same device under the condition that positions of samples are unchanged, experimental variables can be controlled effectively, the reliability of experimental results can be improved, and requirements for experimental space and instrument costs are reduced; for a set of terahertz time domain spectrum systems, more spectral information can be obtained, and accurate measurement of properties such as material structures can be achieved correspondingly.
Description
Technical field
The utility model relates to a kind of Terahertz detection system, relates in particular to the original position conversion detection system of a kind of terahertz time-domain transmission and reflection.
Background technology
Utilize the character that terahertz pulse can analysis of material, wherein terahertz time-domain spectroscopy is a kind of very effective means of testing.The terahertz pulse spectrometer utilizes the ultrashort pulse that mode-locked laser produces to produce and survey terahertz pulse.The terahertz time-domain spectroscopy system is a kind of coherent detection technology, can obtain simultaneously amplitude information and the phase information of terahertz pulse, by time waveform being carried out to Fourier transform, can directly obtain the optical parametrics such as the absorption coefficient of sample and refractive index.Terahertz time-domain spectroscopy has very high detection signal to noise ratio (S/N ratio) and wider detective bandwidth, and detection sensitivity is very high, can be widely used in the detection of several samples.
The terahertz time-domain spectroscopy system is divided into transmission-type and reflective.Traditional terahertz time-domain spectroscopy system can only merely be carried out transmission-type or reflective detection to sample.Different samples show different transmission performances for THz wave: for Terahertz penetration capacity material preferably, as: tygon, glass etc., adopt the transmission-type system to measure usually; For the polar molecule material, as: water etc., to the strong material that absorbs of THz wave, usually show Terahertz propagation characteristic preferably, usually adopt reflect system to detect.And, for some material to the unknown of THz wave response condition, usually wish to adopt transmission, two kinds of detection methods of reflection to measure to same point.Realize that this transmission, reflective conversion need two instruments, this is all existing higher requirement aspect space and funds.Simultaneously, measurement environment changes, and is also very large to the reliability effect of experimental result.
Thus, the inventor, by means of being engaged in experience and the practice of relevant industries for many years, proposes the original position conversion detection system of a kind of terahertz time-domain transmission and reflection, to overcome the defect of prior art.
The utility model content
The purpose of this utility model is to provide the original position conversion detection system of a kind of terahertz time-domain transmission and reflection, can be in the situation that in same device and do not change sample position, realize in site measurement and the conversion mutually thereof of transmission, two kinds of patterns of reflection, effectively to control experimental variable, improve the reliability of experimental result, reduce simultaneously lab space and the requirement of purchasing instrument cost.
The purpose of this utility model is achieved in that the original position conversion detection system of a kind of terahertz time-domain transmission and reflection, and described detection system comprises the first optical path transmission device and the second optical path transmission device; Described the first optical path transmission device is thrown the face mirror from axle and is sequentially formed by femto-second laser, polarizing beam splitter mirror, chopper, time delay device, the first condenser lens, terahertz sources device and first; Described the second optical path transmission device comprises the first completely reflecting mirror that is arranged on polarizing beam splitter mirror one side and polaroid, the second condenser lens and the sniffer that sequentially arranges thereafter; Described chopper is connected with the chopper drive unit; Described sniffer is connected with computing machine by a lock-in amplifier; First, from axle, throw between face mirror and sniffer and be provided with transmission and reflection conversion optical path transmission device; This transmission and reflection conversion optical path transmission device comprise that being arranged on first throws half-reflecting half mirror, detection sample and the second completely reflecting mirror in face mirror bright dipping light path from axle, the second completely reflecting mirror is provided with the 3rd completely reflecting mirror towards sniffer one side correspondence, in the 3rd completely reflecting mirror one side and be provided with the 4th completely reflecting mirror towards the half-reflecting half mirror direction; Described half-reflecting half mirror, the second completely reflecting mirror, the 3rd completely reflecting mirror and the 4th completely reflecting mirror form four jiaos of a rectangle light path, and the reflecting surface of the second completely reflecting mirror, the 3rd completely reflecting mirror and the 4th completely reflecting mirror is all towards the inboard direction of described rectangle light path; In the light path of described detection sample both sides, be respectively equipped with the 3rd condenser lens and the 4th condenser lens; Described half-reflecting half mirror and the second completely reflecting mirror are separately positioned on a turnover link; Between described the 3rd completely reflecting mirror and the 4th completely reflecting mirror, be provided be fixed in be rotationally connected on frame and reflecting surface towards the 5th completely reflecting mirror of sniffer.
In a better embodiment of the present utility model, described sniffer is thrown face mirror, the 6th completely reflecting mirror, electro-optic crystal, the 5th condenser lens, quarter wave plate, wollaston prism and photodiode by second from axle and is sequentially formed; Described second throws the face mirror from axle receives the reflected light from the 5th completely reflecting mirror; Described the 6th completely reflecting mirror receives the reflected light from the first completely reflecting mirror; Described photodiode is electrically connected to lock-in amplifier.
In a better embodiment of the present utility model, described the first～six completely reflecting mirror is the miter angle setting with separately input path and reflected light path respectively.
In a better embodiment of the present utility model, a side of described half-reflecting half mirror is transmission plane, and another side is reflecting surface; Wherein transmission plane and first is the miter angle setting from axle throwing face mirror bright dipping light path.
In a better embodiment of the present utility model, the distance of described detection sample to the second completely reflecting mirror equates with the distance of the 4th completely reflecting mirror to the five completely reflecting mirrors.
From the above mentioned, the original position conversion detection system of the transmission of the utility model terahertz time-domain and reflection, can be in the situation that in same device and do not change sample position, realize in site measurement and the conversion mutually thereof of transmission, two kinds of patterns of reflection, can effectively control experimental variable, improve the reliability of experimental result, reduced simultaneously lab space and the requirement of purchasing instrument cost; For a cover terahertz time-domain spectroscopy system, the spectral information that can obtain is more, tackles mutually the character such as the structure of matter and makes more accurately and measuring.
The accompanying drawing explanation
The following drawings only is intended to the utility model is done and schematically illustrated and explain, does not limit scope of the present utility model.Wherein:
Fig. 1: the structural representation of changing detection system for the original position of the transmission of the utility model terahertz time-domain and reflection.
Fig. 2: be sniffer inner structure schematic diagram in the utility model.
Embodiment
For technical characterictic of the present utility model, purpose and effect being had more clearly, understand, now contrast accompanying drawing explanation embodiment of the present utility model.
As shown in Figure 1 and Figure 2, the utility model proposes the original position conversion detection system 100 of a kind of terahertz time-domain transmission and reflection, described detection system 100 comprises the first optical path transmission device 1 and the second optical path transmission device 2; Described the first optical path transmission device 1 is thrown face mirror 17 orders from axle and is formed by femto-second laser 11, polarizing beam splitter mirror 12, chopper 13, time delay device 14, the first condenser lens 15, terahertz sources device 16 and first; In described terahertz sources device 16, there is the GaAs crystal to produce source as THz; Described the second optical path transmission device 2 comprises the first completely reflecting mirror 21 that is arranged on polarizing beam splitter mirror 12 1 sides and the polaroid that back sequentially arranges 22, the second condenser lens 23 and sniffer 24; Described chopper 13 is connected with chopper drive unit 131; Described sniffer 24 is connected with the computing machine (not shown) by a lock-in amplifier 4; First, from axle, throw between face mirror 17 and sniffer 24 and be provided with transmission and reflection conversion optical path transmission device 3; This transmission and reflection conversion optical path transmission device 3 comprise that being arranged on first throws half-reflecting half mirror 31, detection sample 35 and the second completely reflecting mirror 32 in face mirror 17 bright dipping light paths from axle, the second completely reflecting mirror 32 is provided with the 3rd completely reflecting mirror 33 towards sniffer 24 1 side correspondences, in the 3rd completely reflecting mirror 33 1 sides and be provided with the 4th completely reflecting mirror 34 towards half-reflecting half mirror 31 directions; Described half-reflecting half mirror 31, the second completely reflecting mirror 32, the 3rd completely reflecting mirror 33 and the 4th completely reflecting mirror 34 form four jiaos of a rectangle light path, and the reflecting surface of the second completely reflecting mirror 32, the 3rd completely reflecting mirror 33 and the 4th completely reflecting mirror 34 is all towards the inboard direction of described rectangle light path; In the light path of described detection sample 35 both sides, be respectively equipped with the 3rd condenser lens 36 and the 4th condenser lens 37; Described half-reflecting half mirror 31 and the second completely reflecting mirror 32 are separately positioned on a turnover link (not shown); Between described the 3rd completely reflecting mirror 33 and the 4th completely reflecting mirror 34, be provided be fixed in be rotationally connected on the frame (not shown) and reflecting surface towards the 5th completely reflecting mirror 38 of sniffer 24.One side of described half-reflecting half mirror 31 is transmission plane, and another side is reflecting surface; Wherein transmission plane and first is the miter angle setting from axle throwing face mirror 17 bright dipping light paths.Described detection sample 35 to second completely reflecting mirrors 32 the distance with the 4th completely reflecting mirror 34 to the 5th completely reflecting mirror 38 the distance equate, as shown in Figure 1, described this distance all is made as L.
Further, in the present embodiment, as shown in Figure 2, described sniffer 24 is thrown face mirror 241, the 6th completely reflecting mirror 242, electro-optic crystal (ZnTe) 243, the 5th condenser lens 244, quarter wave plate 245, wollaston prism 246 and photodiode 247 order formations by second from axle; Described second throws from axle the reflected light that face mirror 241 receives from the 5th completely reflecting mirror 38; Described the 6th completely reflecting mirror connects 242 reflected light of receiving from the first completely reflecting mirror 21; Described photodiode 247 is electrically connected to lock-in amplifier 4.Described the first～six completely reflecting mirror is the miter angle setting with separately input path and reflected light path respectively.
The original position conversion detection system of the transmission of the utility model terahertz time-domain and reflection in use, by femto-second laser, send femtosecond laser, through polarizing beam splitter mirror, be divided into and survey light and pump light, a branch of pump light wherein arrives the terahertz sources device through chopper, time delay device and produces THz wave, by transmission and reflection conversion optical path transmission device, make THz wave after sample, be transmitted or reflex to sniffer; Another bundle is surveyed light and also is detected the device reception through the first total reflective mirror, polaroid and the second condenser lens; Described sniffer receives through the THz ripple of sample and surveys light, in sniffer second thrown the face mirror from axle the THz ripple of reception converged on the ZnTe crystal, after the 5th condenser lens, quarter wave plate and wollaston prism, mutually perpendicular two bundle polarized lights are transformed into electric signal through photodiode from the polarization direction that wollaston prism branches away, connect the input end of lock-in amplifier, the output terminal of lock-in amplifier is connected with computing machine.
From the above mentioned, the original position conversion detection system of the transmission of the utility model terahertz time-domain and reflection, can be in the situation that in same device (system) and do not change sample position, realize in site measurement and the conversion mutually thereof of transmission, two kinds of patterns of reflection, can effectively control experimental variable, improve the reliability of experimental result, reduced simultaneously lab space and the requirement of purchasing instrument cost; For a cover terahertz time-domain spectroscopy system, the spectral information that can obtain is more, tackles mutually the character such as the structure of matter and makes more accurately and measuring.
In the present embodiment, the use-pattern of described transmission and reflection conversion optical path transmission device is as follows:
as shown in Figure 1, when by the turnover link, pulling the second completely reflecting mirror 32 down, and by the 5th completely reflecting mirror 38 rotate to position a (position a be the 5th completely reflecting mirror reflecting surface simultaneously towards the 4th completely reflecting mirror 34 and second from position that axle is thrown face mirror 241, and the reflected light of the 4th completely reflecting mirror 34 is reflexed to second on axle throwing face mirror 241) time, by first, from the THz wave of axle throwing face mirror 17 convergences, through the transmission plane of half-reflecting half mirror 31, get to and detect sample 35 surfaces, and from detecting sample 35 surface reflections with to the reflecting surface of half-reflecting half mirror 31, through the 4th completely reflecting mirror 34, after the 5th completely reflecting mirror 38, reflex on THz sniffer 24, this is the pumping light path of reflective terahertz time-domain spectroscopy.
As shown in Figure 1, when by the turnover link, pulling half-reflecting half mirror 31 down, and by the 5th completely reflecting mirror 38 rotate to position b (position b be the 5th completely reflecting mirror reflecting surface simultaneously towards the 3rd completely reflecting mirror 33 and second from the position that axle is thrown face mirror 241, and the reflected light of the 3rd completely reflecting mirror 33 reflexed to second from axle, throw on face mirror 241; Position b is mutually vertical with position b) time, by first, from the THz wave of axle throwing face mirror 17 convergences, through the transmission plane of half-reflecting half mirror 31, get to and detect sample 35 surfaces, the THz wave that sees through detection sample 35 arrives sniffer 24 after the second completely reflecting mirror 32, the 3rd completely reflecting mirror 33, the 5th completely reflecting mirror 38; This is the pumping light path of transmission-type terahertz time-domain spectroscopy.
In the present embodiment, as shown in Figure 1, the distance of described detection sample 35 to second completely reflecting mirrors 32 equates with the distance of the 4th completely reflecting mirror 34 to the 5th completely reflecting mirror 38, thereby guarantees that transmission-type all equates with reflective pump light light path, reaches the purpose of in situ detection; As shown in Figure 1, described this distance all is made as L.
In the present embodiment, survey light after a series of lens and catoptron, the light path identical with pump light of passing by, (this is the prior art content, and those of ordinary skill in the art all knows to arrive sniffer; Can take multiple prior art means to realize, not repeat them here).
From the above mentioned, the original position conversion detection system of the transmission of the utility model terahertz time-domain and reflection, can be in the situation that motionless original position Terahertz transmission-type or the reflective pair of spectral measurement realized sample of sample position, can effectively control experimental variable, improve the reliability of experimental result, reduced simultaneously lab space and the requirement of purchasing instrument cost; For a cover terahertz time-domain spectroscopy system, the spectral information that can obtain is more, tackles mutually the character such as the structure of matter and makes more accurately and measuring.
The foregoing is only the schematic embodiment of the utility model, not in order to limit scope of the present utility model.Any those skilled in the art, the equivalent variations of having done under the prerequisite that does not break away from design of the present utility model and principle and modification, all should belong to the scope that the utility model is protected.
Claims (5)
1. the original position of a terahertz time-domain transmission and reflection conversion detection system, described detection system comprises the first optical path transmission device and the second optical path transmission device; Described the first optical path transmission device is thrown the face mirror from axle and is sequentially formed by femto-second laser, polarizing beam splitter mirror, chopper, time delay device, the first condenser lens, terahertz sources device and first; Described the second optical path transmission device comprises the first completely reflecting mirror that is arranged on polarizing beam splitter mirror one side and polaroid, the second condenser lens and the sniffer that sequentially arranges thereafter; Described chopper is connected with the chopper drive unit; Described sniffer is connected with computing machine by a lock-in amplifier; It is characterized in that: first, from axle, throw between face mirror and sniffer and be provided with transmission and reflection conversion optical path transmission device; This transmission and reflection conversion optical path transmission device comprise that being arranged on first throws half-reflecting half mirror, detection sample and the second completely reflecting mirror in face mirror bright dipping light path from axle, the second completely reflecting mirror is provided with the 3rd completely reflecting mirror towards sniffer one side correspondence, in the 3rd completely reflecting mirror one side and be provided with the 4th completely reflecting mirror towards the half-reflecting half mirror direction; Described half-reflecting half mirror, the second completely reflecting mirror, the 3rd completely reflecting mirror and the 4th completely reflecting mirror form four jiaos of a rectangle light path, and the reflecting surface of the second completely reflecting mirror, the 3rd completely reflecting mirror and the 4th completely reflecting mirror is all towards the inboard direction of described rectangle light path; In the light path of described detection sample both sides, be respectively equipped with the 3rd condenser lens and the 4th condenser lens; Described half-reflecting half mirror and the second completely reflecting mirror are separately positioned on a turnover link; Between described the 3rd completely reflecting mirror and the 4th completely reflecting mirror, be provided be fixed in be rotationally connected on frame and reflecting surface towards the 5th completely reflecting mirror of sniffer.
2. the original position of terahertz time-domain transmission as claimed in claim 1 and reflection is changed detection system, it is characterized in that: described sniffer is thrown face mirror, the 6th completely reflecting mirror, electro-optic crystal, the 5th condenser lens, quarter wave plate, wollaston prism and photodiode by second from axle and is sequentially formed; Described second throws the face mirror from axle receives the reflected light from the 5th completely reflecting mirror; Described the 6th completely reflecting mirror receives the reflected light from the first completely reflecting mirror; Described photodiode is electrically connected to lock-in amplifier.
3. the original position of terahertz time-domain transmission as claimed in claim 2 and reflection is changed detection system, and it is characterized in that: described the first～six completely reflecting mirror is the miter angle setting with separately input path and reflected light path respectively.
4. the original position of terahertz time-domain transmission as claimed in claim 2 and reflection is changed detection system, and it is characterized in that: a side of described half-reflecting half mirror is transmission plane, and another side is reflecting surface; Wherein transmission plane and first is the miter angle setting from axle throwing face mirror bright dipping light path.
5. the original position of terahertz time-domain transmission as claimed in claim 2 and reflection is changed detection system, it is characterized in that: the distance of described detection sample to the second completely reflecting mirror equates with the distance of the 4th completely reflecting mirror to the five completely reflecting mirrors.
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| CN2013203621936U CN203299111U (en) | 2013-06-24 | 2013-06-24 | Terahertz time domain transmission and reflection in-situ conversion detection system |
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| CN2013203621936U CN203299111U (en) | 2013-06-24 | 2013-06-24 | Terahertz time domain transmission and reflection in-situ conversion detection system |
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| CN103644968A (en) * | 2013-11-25 | 2014-03-19 | 深圳先进技术研究院 | Automatic inflation cabin and terahertz time-domain spectroscopy system provided with same |
| CN104568819A (en) * | 2015-01-15 | 2015-04-29 | 南开大学 | All-fiber transmission reflection integrated terahertz time-domain spectroscopy system |
| CN104749110A (en) * | 2013-12-30 | 2015-07-01 | 深圳先进技术研究院 | Spectrum detection device |
| CN105738315A (en) * | 2016-04-07 | 2016-07-06 | 绍兴文理学院 | Terahertz device for real-time monitoring of biomolecule composition and content and measuring method thereof |
| CN105784634A (en) * | 2016-03-31 | 2016-07-20 | 电子科技大学 | Terahertz time domain spectrograph capable of measuring transmission and reflection simultaneously under vertical incidence |
| CN106441580A (en) * | 2016-06-16 | 2017-02-22 | 电子科技大学 | Terahertz time-domain spectrometer capable of variable-angle incidence and simultaneous measurement of transmission and reflection |
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| CN103644968B (en) * | 2013-11-25 | 2016-04-27 | 深圳先进技术研究院 | Automatic inflating cabin and there is the terahertz time-domain spectroscopy system in automatic inflating cabin |
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| CN104749110B (en) * | 2013-12-30 | 2019-04-02 | 深圳先进技术研究院 | Spectrum detection device |
| CN104749110A (en) * | 2013-12-30 | 2015-07-01 | 深圳先进技术研究院 | Spectrum detection device |
| CN104568819A (en) * | 2015-01-15 | 2015-04-29 | 南开大学 | All-fiber transmission reflection integrated terahertz time-domain spectroscopy system |
| CN105784634A (en) * | 2016-03-31 | 2016-07-20 | 电子科技大学 | Terahertz time domain spectrograph capable of measuring transmission and reflection simultaneously under vertical incidence |
| CN105738315A (en) * | 2016-04-07 | 2016-07-06 | 绍兴文理学院 | Terahertz device for real-time monitoring of biomolecule composition and content and measuring method thereof |
| CN106441580A (en) * | 2016-06-16 | 2017-02-22 | 电子科技大学 | Terahertz time-domain spectrometer capable of variable-angle incidence and simultaneous measurement of transmission and reflection |
| CN109983322A (en) * | 2016-11-28 | 2019-07-05 | 佳能株式会社 | Image capture apparatus, the method and irradiation unit that image is captured with image capture apparatus |
| US11646329B2 (en) | 2016-11-28 | 2023-05-09 | Canon Kabushiki Kaisha | Image capture device, method of capturing image with the same, and irradiation device |
| CN107233076B (en) * | 2017-05-24 | 2018-02-23 | 西北核技术研究所 | A kind of insertion type is in the real-time tumor imaging system of body |
| CN107233076A (en) * | 2017-05-24 | 2017-10-10 | 西北核技术研究所 | A kind of insertion type is in the real-time tumor imaging method of body and system |
| CN109507146A (en) * | 2018-11-30 | 2019-03-22 | 深圳市华讯方舟太赫兹科技有限公司 | A kind of terahertz time-domain spectroscopy detection device |
| CN109799222A (en) * | 2019-01-17 | 2019-05-24 | 华东师范大学 | A kind of image-pickup method of Raman face battle array EO-1 hyperion |
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