CN201141981Y - Continuous wave Terahertz real-time imaging device - Google Patents
Continuous wave Terahertz real-time imaging device Download PDFInfo
- Publication number
- CN201141981Y CN201141981Y CNU200820091502XU CN200820091502U CN201141981Y CN 201141981 Y CN201141981 Y CN 201141981Y CN U200820091502X U CNU200820091502X U CN U200820091502XU CN 200820091502 U CN200820091502 U CN 200820091502U CN 201141981 Y CN201141981 Y CN 201141981Y
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- China
- Prior art keywords
- sample stage
- lens
- thz
- imaging
- paraboloidal mirror
- Prior art date
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- Expired - Fee Related
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- 238000003384 imaging method Methods 0.000 title claims abstract description 33
- 230000005540 biological transmission Effects 0.000 claims abstract description 5
- 230000005616 pyroelectricity Effects 0.000 claims description 22
- HGAZMNJKRQFZKS-UHFFFAOYSA-N chloroethene;ethenyl acetate Chemical compound ClC=C.CC(=O)OC=C HGAZMNJKRQFZKS-UHFFFAOYSA-N 0.000 claims description 18
- 229920001903 high density polyethylene Polymers 0.000 claims description 5
- 239000004700 high-density polyethylene Substances 0.000 claims description 5
- 239000004809 Teflon Substances 0.000 claims description 2
- 229920006362 Teflon® Polymers 0.000 claims description 2
- 230000003287 optical effect Effects 0.000 abstract description 6
- 230000005855 radiation Effects 0.000 abstract description 5
- 238000001514 detection method Methods 0.000 abstract description 4
- 239000004033 plastic Substances 0.000 abstract description 2
- 229920003023 plastic Polymers 0.000 abstract description 2
- 239000004698 Polyethylene Substances 0.000 abstract 3
- -1 polyethylene Polymers 0.000 abstract 3
- 229920000573 polyethylene Polymers 0.000 abstract 3
- 231100001261 hazardous Toxicity 0.000 abstract 1
- 239000007769 metal material Substances 0.000 abstract 1
- 239000000126 substance Substances 0.000 abstract 1
- 239000004753 textile Substances 0.000 abstract 1
- 238000005086 pumping Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000001427 coherent effect Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 239000003989 dielectric material Substances 0.000 description 1
- 230000005670 electromagnetic radiation Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 238000011897 real-time detection Methods 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 238000004611 spectroscopical analysis Methods 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
- G01N21/3581—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light using far infrared light; using Terahertz radiation
Abstract
A THz wave real-time imaging device for solving the technical problems of prior imaging device such as small area, complex structure, low imaging speed and complex data processing comprises a continuous THz radiation source, an off-axis paraboloidal mirror, a sample stage, a polyethylene lens, a pyroelectric camera and a computer, wherein the off-axis paraboloidal mirror is arranged on the THz emission path of the THz radiation source; the sample stage is arranged behind the off-axis paraboloidal mirror; the optical path passes through the sample on the sample stage; the polyethylene lens is arranged on the optical path on the rear edge of the sample stage; the receiving port of the pyroelectric camera is arranged on the transmission light path of the polyethylene lens; and the imaging data of the pyroelectric camera is transmitted to the computer. The imaging device has simple and convenient operation, and can meet the detection requirement for different substances and different needs. The device can be used for imaging hazardous metal materials in real time, such as cutting tools, wrapped in a wrapper such as newspaper, textile and plastic, and can be used for nondestructive detection of objects in letters.
Description
Affiliated technical field
The utility model relates to a kind of imaging device, relates to a kind of THz wave real time imagery device particularly.
Prior art
Terahertz (THz) radiation is meant that oscillation frequency is at 0.1THz-10THz (1THz=10
12Hz) electromagnetic wave, the electromagnetic radiation of this wave band has the character of a lot of uniquenesses: 1) the THz ripple has good penetrability to a lot of dielectric materials and non-polar liquid, so THz wave can be carried out perspective imaging to opaque article; 2) another distinguishing feature of THz ripple is its security, and its photon energy is very low, to biosome safety; 3) the THz wave band has also comprised abundant spectral information, has good spectrally resolved characteristic.Thereby Terahertz Technology all has special advantages in fields such as biomedicine, safety monitorings.
Consider that from radiation source the THz imaging technique can be divided into pulsating wave THz imaging and continuous wave THz imaging two big classes at present.The imaging of pulsating wave THz time-domain spectroscopy is to study THz imaging technique the most widely, mainly be to utilize ultrashort pulse to excite to produce the THz pulse, through the be converted to sample various information of time domain to frequency domain, carry out data processing then and obtain the THz image, the THz power low (microwatt level) that the method produces, image taking speed is slow, data processing is loaded down with trivial details.In the continuous wave THz imaging technique, quantum cascade laser can be adopted in the THz source, but the quantum cascade laser output frequency is higher, and needs cold operation; Can also adopt carcinotron, its advantage is that output frequency is adjustable, but its output frequency too low (＜1.5THz).Optical pumping thz laser device also is the radiation source that produces continuous wave THz, can working and room temperature, and output power is higher.Consider that from formation method the THz imaging technique can be divided into scanning imagery and real time imagery two big classes: scanning imaging technology scans one by one to each point on the sample, and image taking speed is slow; And the THz real time imagery mainly adopts electro-optic crystal now, and imaging area is less, imaging arrangement is complicated.Utilize optical pumping thz laser device and pyroelectricity array camera, THz image that can the real-time detection object.
Summary of the invention
For solving technical matterss such as existing imaging device imaging area is less, imaging arrangement is complicated, image taking speed is slow, data processing is loaded down with trivial details, the utility model provides a kind of simple in structure, easy to operate THz wave real time imagery device.
The utility model is achieved through the following technical solutions goal of the invention:
A kind of continuous wave HZ real time imaging apparatus, this device comprise continuous wave terahertz emission source, off axis paraboloidal mirror, sample stage, tygon lens, pyroelectricity camera and computing machine; Off axis paraboloidal mirror is arranged on the Terahertz transmission path in terahertz emission source, sample stage is set behind the off axis paraboloidal mirror, light path is by the sample on the sample stage, along light path the tygon lens are set after the sample stage, the receiving port of pyroelectricity camera is arranged on the transmitted light path of tygon lens, continuous wave sends from the terahertz emission source after off axis paraboloidal mirror is collected and concentrated inciding on the sample of sample stage, received by the pyroelectricity camera through the tygon lens, data insert computing machine behind the pyroelectricity camera imaging again; Described tygon lens can be high density polyethylene lens or teflon lens.
On being collected and incide sample on the sample stage by off axis paraboloidal mirror from the Terahertz of continuous wave terahertz emission source outgoing, loaded the information of sample from the Terahertz of sample transmission, this flashlight is collected and is incided on the pyroelectricity camera by the tygon lens, the pyroelectricity camera changes light signal into electric signal, be input on the computing machine, the Terahertz image of sample is handled and demonstrated in real time to computing machine on display to data.The distance of off axis paraboloidal mirror and tygon lens makes signal uniform irradiation pyroelectricity camera receiving plane, regulates sample to the distance of tygon lens and the position of pyroelectricity camera, can regulate the magnification of image.Regulate the output wavelength in terahertz emission source, can also obtain the Terahertz image of different frequency.
The beneficial effects of the utility model are that pyroelectricity camera receiving area is big, image taking speed is fast, imaging area is big, and output frequency and the output power that can regulate the terahertz emission source as required, regulate the imaging magnification of optical system, thereby satisfy the detection requirement of different material, different needs.This device can carry out real time imagery to being hidden in metal dangerous material in the wrappages such as newspaper, fabric, plastics such as cutter etc., can also carry out lossless detection to the object in the mail.
Description of drawings
Fig. 1 is the continuous wave HZ real time imaging apparatus structural drawing
Among the figure, 1 continuous wave terahertz emission source, 2 off axis paraboloidal mirrors, 3 sample stage, 4 tygon lens, 5 pyroelectricity cameras, 6 computing machines.
Embodiment
As shown in drawings, a kind of continuous wave HZ real time imaging apparatus, comprise continuous wave terahertz emission source 1, off axis paraboloidal mirror 2, sample stage 3, tygon lens 4, pyroelectricity camera 5 and computing machine 6, off axis paraboloidal mirror 2 is arranged on the Terahertz transmission path in terahertz emission source 1, sample stage 3 is set behind the off axis paraboloidal mirror 2, light path is by the sample on the sample stage 3, sample stage 3 backs are provided with tygon lens 4 along light path, the receiving port of pyroelectricity camera 5 is arranged on the transmitted light path of tygon lens 4, continuous wave sends from terahertz emission source 1 after off axis paraboloidal mirror 2 is collected and concentrated inciding on the sample of sample stage 3, received by pyroelectricity camera 5 through tygon lens 4, data insert computing machine 6 after 5 imagings of pyroelectricity camera again.The Sifir-50 optical pumping thz laser device of U.S. Coherent company is selected in continuous wave terahertz emission source 1 for use, and its output wavelength is adjustable to 300 μ m at 40 μ m, and the output average power is in tens milliwatt magnitudes.The use of off axis paraboloidal mirror can reduce aberration.Tygon lens 4 are to adopt the high density polyethylene lens.The focal length of off axis paraboloidal mirror 2 and high density polyethylene lens 4 is respectively 10cm and 5cm.After sample stage 3 was positioned over off axis paraboloidal mirror 2, the distance between paraboloidal mirror and the high density polyethylene lens made uniform irradiation on pyroelectricity camera 5 receiving planes.The Pyrocam III type pyroelectricity array camera that pyroelectricity camera 5 selects for use U.S. Spiricon company to produce.Pyroelectricity camera 5 links to each other by 1394 interfaces with computing machine 6.
Claims (2)
1, a kind of continuous wave HZ real time imaging apparatus is characterized in that: this device comprises continuous wave terahertz emission source (1), off axis paraboloidal mirror (2), sample stage (3), tygon lens (4), pyroelectricity camera (5) and computing machine (6); Off axis paraboloidal mirror (2) is arranged on the Terahertz transmission path in terahertz emission source (1), sample stage (3) is set behind the off axis paraboloidal mirror (2), light path is by the sample on the sample stage (3), sample stage (3) back is provided with tygon lens (4) along light path, the receiving port of pyroelectricity camera (5) is arranged on the transmitted light path of tygon lens (4), and data insert computing machine (6) after pyroelectricity camera (5) imaging.
2, a kind of continuous wave HZ real time imaging apparatus according to claim 1 is characterized in that: described tygon lens (4) can be high density polyethylene lens or teflon lens.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU200820091502XU CN201141981Y (en) | 2008-01-02 | 2008-01-02 | Continuous wave Terahertz real-time imaging device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU200820091502XU CN201141981Y (en) | 2008-01-02 | 2008-01-02 | Continuous wave Terahertz real-time imaging device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201141981Y true CN201141981Y (en) | 2008-10-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU200820091502XU Expired - Fee Related CN201141981Y (en) | 2008-01-02 | 2008-01-02 | Continuous wave Terahertz real-time imaging device |
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| CN (1) | CN201141981Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101840003A (en) * | 2010-03-05 | 2010-09-22 | 清华大学 | Green channel open vehicle radar detection method for metal contraband articles |
| CN101251492B (en) * | 2008-01-02 | 2011-06-22 | 阮双琛 | Continuous wave HZ real time imaging apparatus and method thereof |
| CN102353998A (en) * | 2011-05-19 | 2012-02-15 | 公安部第三研究所 | Terahertz (THz) video camera for channel security check |
| CN102749341A (en) * | 2012-07-11 | 2012-10-24 | 中国科学院上海微系统与信息技术研究所 | Tomography imaging system and method based on terahertz quantum device |
-
2008
- 2008-01-02 CN CNU200820091502XU patent/CN201141981Y/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101251492B (en) * | 2008-01-02 | 2011-06-22 | 阮双琛 | Continuous wave HZ real time imaging apparatus and method thereof |
| CN101840003A (en) * | 2010-03-05 | 2010-09-22 | 清华大学 | Green channel open vehicle radar detection method for metal contraband articles |
| CN101840003B (en) * | 2010-03-05 | 2012-07-25 | 清华大学 | Green channel open vehicle radar detection method for metal contraband articles |
| CN102353998A (en) * | 2011-05-19 | 2012-02-15 | 公安部第三研究所 | Terahertz (THz) video camera for channel security check |
| CN102353998B (en) * | 2011-05-19 | 2013-12-25 | 公安部第三研究所 | Terahertz (THz) video camera for channel security check |
| CN102749341A (en) * | 2012-07-11 | 2012-10-24 | 中国科学院上海微系统与信息技术研究所 | Tomography imaging system and method based on terahertz quantum device |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20081029 Termination date: 20110102 |