CN204255853U - Quick THz continuous wave scanning imaging system - Google Patents
Quick THz continuous wave scanning imaging system Download PDFInfo
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- CN204255853U CN204255853U CN201420751909.6U CN201420751909U CN204255853U CN 204255853 U CN204255853 U CN 204255853U CN 201420751909 U CN201420751909 U CN 201420751909U CN 204255853 U CN204255853 U CN 204255853U
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Abstract
Quick THz continuous wave scanning imaging system, by thz laser device, frequency-adjustable joint chopper, wire grating, surface gold-plating catoptron, two Terahertz condenser lenses, two-dimension translational platform, two Golay-cell detectors are formed, and the thz laser that thz laser device produces is divided into two bundles through frequency-adjustable joint chopper by wire grating, and a branch of conduct reference Transmission light is to a Golay-cell detector; Another Shu Yici through surface gold-plating catoptron, two Terahertz condenser lenses, be clipped in sample in the middle of two Terahertz condenser lenses on two-dimension translational platform, be transmitted to another Golay-cell detector, two Golay-cell detectors export measurement results.The utility model is by controlling continuous moving and the detector signal Real-time Collection of translation stage simultaneously, realize fast imaging, and by choosing high-frequency Terahertz light source and two-way detection, realize high-quality, high-resolution imaging, improves the shortcoming of THz continuous wave scanning imaging system scanning imagery time length and image quality difference.
Description
Technical field
The utility model relates to a kind of THz continuous wave scanning imaging system and method fast, belongs to THz imaging technology field.Specifically, quick THz continuous wave scanning imaging system is related to.
Technical background
THz continuous wave scanning imaging technology is one of main method of THz imaging technology.Current THz imaging technology is mainly divided into pulsating wave imaging and continuous wave imaging, and the former need with femto-second laser as pumping source, and system cost is high, bulky, and sweep velocity is slow.Continuous wave imaging system can select area array cameras as terahertz wave detector, and image taking speed is fast, but the restriction of image quality camera subject array, and image quality is poor.In the THz continuous wave scanning imaging technology reported at present, the Gunn oscillator that adopts as imaging system light sources more, and its output wavelength is longer, and image quality is poor; In part report, select carbon dioxide gas laser to produce terahertz emission as pumping source and carry out scanning imagery research, its resolution increases, and the imaging resolution reported is also at more than 0.2mm.The scan mode that the THz continuous wave scanning imaging technology reported at present adopts is platform movement scanning step, carry out a data acquisition, there is sweep spacing, general at about 0.5 second, the variable motion of translation stage and pause cause sweep time long, image taking speed is slow, and imaging required time is between dozens of minutes was to several hours.Existing imaging system and the deficiency of method on imaging resolution and sweep velocity constrain it in scientific research field, field of biological medicine practical application.
Summary of the invention
For overcoming the deficiencies in the prior art, the utility model aims to provide a kind of scheme of quick THz continuous wave scanning imagery, scanning imagery speed is accelerated, resolution improves to adopt the program to make, 10 pixels can be gathered p.s., under 4.3THz rate-adaptive pacemaker, scan image resolution reaches 0.1mm, and can at room temperature long-term stable operation.For this reason, the technical scheme that the utility model is taked is, quick THz continuous wave scanning imaging system, by thz laser device, frequency-adjustable joint chopper, wire grating, surface gold-plating catoptron, two Terahertz condenser lenses, two-dimension translational platform, two Golay-cell detectors, and computing machine is formed, the thz laser that thz laser device produces is divided into two bundles through frequency-adjustable joint chopper by wire grating, and a branch of conduct reference Transmission light is to a Golay-cell detector; Another Shu Yici through surface gold-plating catoptron, two Terahertz condenser lenses, be clipped in sample in the middle of two Terahertz condenser lenses on two-dimension translational platform, be transmitted to another Golay-cell detector; Two Golay-cell detectors export measurement result.
Wire grating metal wire direction is tunable, by changing angular adjustment splitting ratio, making to be divided into two beam power ratios and meeting 1:1.
On two-dimension translational platform, sample is in Terahertz condenser lens focal plane place.
Compared with the prior art, technical characterstic of the present utility model and effect:
The utility model is by controlling continuous moving and the detector signal Real-time Collection of translation stage simultaneously, realize fast imaging, and by choosing high-frequency Terahertz light source and two-way detection, realize high-quality, high-resolution imaging, thus the utility model improves the shortcoming of THz continuous wave scanning imaging system scanning imagery time length and image quality difference, this THz continuous wave scanning imaging technology, by transmission imaging mode, realize scanning sample transmission, obtain sample to the absorption information of THz wave, biomedical detection and public safety field can be widely used in.
Accompanying drawing explanation
Fig. 1 is the utility model structural representation.
In figure: 1. thz laser device; 2. frequency-adjustable joint chopper; 3. wire grating; 4. surface gold-plating catoptron; 5.Tsurupica lens; 6.Tsurupica Terahertz super lens; 7. two-dimension translational platform; 8.Golay-cell detector; 9.Golay-cell detector; 10. computing machine.
Fig. 2 scanning pattern schematic diagram.
Embodiment
The utility model proposes a kind of scheme of quick THz continuous wave scanning imagery, scheme carries out light splitting to terahertz emission, improves the signal to noise ratio (S/N ratio) of imaging results by introducing reference light; Flashlight being focused on and impinges perpendicularly on sample place, realizing scanning imagery by changing sample position, therefore needing sample to be fixed on two-dimension translational platform, by controlling translation stage continuous moving, sample position being changed.Programming Control translation stage continuous moving, translational speed is stablized, without pausing, and according to the data of two terahertz detectors in record corresponding position, translation stage position.The detector detectable signal light identical by model and the intensity level of pump light, compare the Terahertz transmission scan imaging results drawing sample.The data comparing method of two detectors: the intensity level (light beam without sample) of intensity level divided by reference light using flashlight (light beam through sample).
The utility model is realized by following technical proposals, comprise thz laser device 1, frequency-adjustable joint chopper 2, wire grating 3, surface gold-plating catoptron 4, Terahertz condenser lens 5,6, two-dimension translational platform 7, Golay-cell detector 8,9, and the quick THz continuous wave scanning imaging system that computing machine 10 is formed, by choosing high-frequency Terahertz light source and two-way detection, realize high-quality, high-resolution imaging.Golay-cell: high Lay box.
Below by accompanying drawing and a specific embodiment, further describe the utility model.
In embodiment of the present utility model, thz laser device can select carbon dioxide pumping thz laser device, methanol gas is filled in its sample cavity, five different wave length Terahertzs can be had to export, and select 4.3THz rate-adaptive pacemaker according to real needs, its output rating is 20mW; Because detector cannot corresponding continuous wave signal, therefore need to carry out copped wave with chopper, make detector detect terahertz signal.System imaging speed is relevant with the chopping frequency of chopper, and therefore the adjustable chopper of selected frequency can change image taking speed, and chopper chopping frequency is that 1-4000Hz is adjustable, and dutycycle is 50%, according to explorer response frequency, chopping frequency is set to 50Hz; Its image taking speed is very fast.Also higher than 50Hz, but system stability can be had influence on, the aspects such as image quality.Wire grating metal wire direction is tunable, can regulate splitting ratio, making flashlight and reference light power proportions meet 1:1 by changing angle; Tsurupica lens selected by condenser lens, are of a size of 50mm, and focal length is 50mm; Putting two-dimension translational platform makes sample be in lens focal plane place, and scan mode is snakelike movement, translation stage continuous moving in scanning process, without pausing; Serpentine locomotion refers to that translation stage moves, and focal beam spot position immobilizes, and translation stage only moves up and down and moves left and right, and without spin, translation stage moving line is upwards scan row, and then move right a step-length, move down row again, then move right a step-length, so repeatedly.GP-1T model selected by Golay-cell detector.Two-dimension translational platform position: be on the image space focal plane of previous lens is also the object space focal plane of rear lens simultaneously.
By writing LabVIEW programmed control translation stage continuous moving, system introduces external trigger signal, the corresponding translation stage of each trigger pip moves a segment distance, program judges the position of translation stage by recording the number of trigger pip, and records the reading of Golay-cell detector of each pixel position.Computing machine obtains Terahertz scan image according to the data reconstruction that detector detects, and often completes a column scan, draws when row image immediately, shortens sweep time further.
After whole system has been built, sample only need be fixed on translation stage by each scanning, opens LabVIEW programmed control panel, and setting sweep limit, scanning step, working procedure can complete scanning.When scanning light source is 4.3THz rate-adaptive pacemaker, its scanning imagery resolution is 0.1mm, only needs 17 minutes to the Sample Scan time of 1cm × 1cm size.
Claims (3)
1. a quick THz continuous wave scanning imaging system, it is characterized in that, by thz laser device, frequency-adjustable joint chopper, wire grating, surface gold-plating catoptron, two Terahertz condenser lenses, two-dimension translational platform, two Golay-cell detectors are formed, the thz laser that thz laser device produces is divided into two bundles through frequency-adjustable joint chopper by wire grating, and a branch of conduct reference Transmission light is to a Golay-cell detector; Another Shu Yici through surface gold-plating catoptron, two Terahertz condenser lenses, be clipped in sample in the middle of two Terahertz condenser lenses on two-dimension translational platform, be transmitted to another Golay-cell detector; Two Golay-cell detectors export measurement result.
2. THz continuous wave scanning imaging system fast as claimed in claim 1, it is characterized in that, wire grating metal wire direction is tunable, by changing angular adjustment splitting ratio, making to be divided into two beam power ratios and meeting 1:1.
3. THz continuous wave scanning imaging system fast as claimed in claim 2, it is characterized in that, on two-dimension translational platform, sample is in Terahertz condenser lens focal plane place.
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| CN201420751909.6U CN204255853U (en) | 2014-12-03 | 2014-12-03 | Quick THz continuous wave scanning imaging system |
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| CN201420751909.6U CN204255853U (en) | 2014-12-03 | 2014-12-03 | Quick THz continuous wave scanning imaging system |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105466883A (en) * | 2015-12-31 | 2016-04-06 | 天津大学 | Device and method for detecting ischemic cerebrum based on TeraHertz wave reflecting type imaging |
| CN105510272A (en) * | 2015-12-31 | 2016-04-20 | 天津大学 | Ischemic cerebrum detection device and method based on terahertz wave transmission type imaging |
| CN106124413A (en) * | 2016-07-18 | 2016-11-16 | 天津大学 | A kind of device improving THz wave compressed sensing image quality based on double image element |
| CN106769997A (en) * | 2016-11-14 | 2017-05-31 | 中国电子科技集团公司第四十研究所 | A kind of Terahertz scanned imagery device |
| CN108107016A (en) * | 2016-11-24 | 2018-06-01 | 北京遥感设备研究所 | A kind of quasi-optical reflection imaging system of low-loss high-isolation Terahertz |
| CN109142267A (en) * | 2018-09-07 | 2019-01-04 | 北京华航无线电测量研究所 | A kind of real-time terahertz imaging device and method |
| CN109297932A (en) * | 2018-08-29 | 2019-02-01 | 北京遥感设备研究所 | A kind of quasi-optical servo scarnning mirror continuous wave reflection imaging system of Terahertz |
-
2014
- 2014-12-03 CN CN201420751909.6U patent/CN204255853U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105466883A (en) * | 2015-12-31 | 2016-04-06 | 天津大学 | Device and method for detecting ischemic cerebrum based on TeraHertz wave reflecting type imaging |
| CN105510272A (en) * | 2015-12-31 | 2016-04-20 | 天津大学 | Ischemic cerebrum detection device and method based on terahertz wave transmission type imaging |
| CN106124413A (en) * | 2016-07-18 | 2016-11-16 | 天津大学 | A kind of device improving THz wave compressed sensing image quality based on double image element |
| CN106124413B (en) * | 2016-07-18 | 2018-08-24 | 天津大学 | A kind of device of the raising THz wave compressed sensing image quality based on double image element |
| CN106769997A (en) * | 2016-11-14 | 2017-05-31 | 中国电子科技集团公司第四十研究所 | A kind of Terahertz scanned imagery device |
| CN108107016A (en) * | 2016-11-24 | 2018-06-01 | 北京遥感设备研究所 | A kind of quasi-optical reflection imaging system of low-loss high-isolation Terahertz |
| CN109297932A (en) * | 2018-08-29 | 2019-02-01 | 北京遥感设备研究所 | A kind of quasi-optical servo scarnning mirror continuous wave reflection imaging system of Terahertz |
| CN109142267A (en) * | 2018-09-07 | 2019-01-04 | 北京华航无线电测量研究所 | A kind of real-time terahertz imaging device and method |
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Granted publication date: 20150408 Termination date: 20171203 |
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