CN205038165U - Continuous wave terahertz is real -time watermark formation of image detection device now - Google Patents
Continuous wave terahertz is real -time watermark formation of image detection device now Download PDFInfo
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- CN205038165U CN205038165U CN201520721353.0U CN201520721353U CN205038165U CN 205038165 U CN205038165 U CN 205038165U CN 201520721353 U CN201520721353 U CN 201520721353U CN 205038165 U CN205038165 U CN 205038165U
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Abstract
The utility model discloses a continuous wave terahertz is real -time watermark formation of image detection device now, the device include that radiation source, collimation expand the system of restrainting, high resistant silicon chip, argon ion laser, off axis paraboloidal mirror, sample platform, terahertz wave detector and computer to the continuous wave terahertz now. The utility model discloses utilize the collimation to expand the system of restrainting with the terahertz wave collimation for beam to carry out the secondary through off axis paraboloidal mirror and expand and restraint, focus on the terahertz wave detector with it after seeing through the sample, carry out real time imaging through the computer to the image and show, and utilize on whether the argon laser shine the high resistant silicon chip, realize opening, close control to detection device. The utility model discloses a continuous wave terahertz is real -time watermark formation of image detection device now has compact structure, and response speed is fast, and the switch is convenient, can carry out real time imaging to the watermark, has important practical application and worth. Can also can't harm the detection to the objects of hiding in parcel things such as newspaper, fabric, plastics such as metal hazardous articles.
Description
Technical field
The utility model relates to a kind of imaging detection device, relates to a kind of continuous wave Terahertz Real-time Water print imaging detection device particularly.
Background technology
Terahertz (THz) radiation refers to that oscillation frequency is at 0.1THz-10THz (1THz=10
12hz) electromagnetic wave, the electromagnetic radiation of this wave band has a lot of unique character: 1) THz ripple has good penetrability to a lot of dielectric material and non-polar liquid, and therefore THz wave can carry 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) THz wave band further comprises abundant spectral information, has good spectrally resolved characteristic.Thus Terahertz Technology has unique advantage in fields such as biomedicine, safety monitorings.
Consider from radiation source at present, THz imaging technique can be divided into pulsating wave THz imaging and the large class of continuous wave THz imaging two.THz imaging technique is the most widely studied in the imaging of pulsating wave THz time domain spectrum, mainly utilize ultrashort pulse to excite and produce THz pulse, the various information of sample is converted to frequency domain through time domain, then carry out data processing and obtain THz image, the method produce THz power low (microwatt level), image taking speed is slow, data processing is loaded down with trivial details.In continuous wave THz imaging technique, THz source can adopt quantum cascade laser, but quantum cascade laser output frequency is higher, and needs cold operation; Can also adopt backward wave oscillator, its advantage is that output frequency is adjustable, but its output frequency too low (< 1.5THz); Co2 laser pumping continuous wave laser is also the radiation source producing continuous wave THz, can working and room temperature, and output power is higher, and adjustable frequency is many, is easy to operation.Consider from formation method, THz imaging technique can be divided into scanning imagery and the large class of real time imagery two: scanning imaging technology successively scans each point on sample, and image taking speed is slow; And THz real time imagery mainly adopts electro-optic crystal, image taking speed is fast but imaging area is little, needs to expand radiant light when inspected object area is larger.
Summary of the invention
Can test sample product imaging area is less, image taking speed is slow, data processing is loaded down with trivial details technical matters for solve in existing imaging device, the THz wave Real-time Water print imaging detection device that the utility model provides a kind of structure simple, easy to operate.
The utility model is achieved through the following technical solutions goal of the invention:
A kind of continuous wave Terahertz Real-time Water print imaging detection device, is characterized in that: this device comprises continuous wave terahertz emission source (1), collimating and beam expanding system (2), high resistant silicon chip (3), Argon ion laser (4), the first off axis paraboloidal mirror (5), the second off axis paraboloidal mirror (6), sample stage (7), the 3rd off axis paraboloidal mirror (8), terahertz wave detector (9) and computing machine (10);
Described Terahertz wave source (1) connects collimating and beam expanding system (2), high resistant silicon chip (3), the first off axis paraboloidal mirror (5), the second off axis paraboloidal mirror (6), sample stage (7), the 3rd off axis paraboloidal mirror (8), terahertz wave detector (9) and computing machine (10) successively;
Described tunable Argon ion laser (4) is irradiated on high resistant silicon chip (3).
Described continuous wave terahertz emission source (1) is backward wave oscillator, quantum cascade laser or co2 laser pumping continuous wave terahertz emission source.
Described collimating and beam expanding system (2) is Kepler-type or Galilean type collimating and beam expanding system.
Described high resistant silicon chip (3) thickness h=400 μm, radius r=25mm, resistivity 10000 Ω cm.
Described terahertz wave detector (9) is focal plane array detector, and detection sensitivity is high, and real-time is good.
Described terahertz wave detector (9) selects the IRV-T0831C focal plane arrays (FPA) camera of Japanese NEC Corporation.
The utility model has the advantage of:
A. carried out secondary to terahertz wave beam to expand, can detect by the object larger to area at sample stage;
B. utilize tunable argon laser whether to be irradiated on high resistant silicon chip, realize controlling the open and close of pick-up unit, can control display number of image frames;
C. utilize focal plane array detector and carry software and carry out real time imagery display to image, detection sensitivity is high, and real-time is good;
D. the THz wave energy of the utility model application is low, and device use safety, can not cause any radiation threat to human body, there is not radioactive contamination.
Accompanying drawing explanation
Fig. 1 the utility model image device structure figure
Fig. 2 (a) 5 yuans of watermark images
Fig. 2 (b) 20 yuans of watermark images
In figure, continuous wave terahertz emission source (1), collimating and beam expanding system (2), high resistant silicon chip (3), Argon ion laser (4), the first off axis paraboloidal mirror (5), the second off axis paraboloidal mirror (6), sample stage (7), the 3rd off axis paraboloidal mirror (8), terahertz wave detector (9) and computing machine (10)
Embodiment
As shown in drawings, a kind of continuous wave Terahertz Real-time Water print imaging detection device, comprises continuous wave terahertz emission source (1), collimating and beam expanding system (2), high resistant silicon chip (3), Argon ion laser (4), the first off axis paraboloidal mirror (5), the second off axis paraboloidal mirror (6), sample stage (7), the 3rd off axis paraboloidal mirror (8), terahertz wave detector (9) and computing machine (10);
Described continuous wave terahertz emission source (1) is collimated and expands after collimating and beam expanding system (2), arrive high resistant silicon chip (3), whether be irradiated to high resistant silicon chip by Argon ion laser (4) and realize opening pick-up unit, close and control, the to be measured containing on sample of sample stage (7) is irradiated to after being expanded by the first off axis paraboloidal mirror (5) and the second off axis paraboloidal mirror (6), continuous wave Terahertz is focused on by the 3rd off axis paraboloidal mirror (8) through after sample, recycling terahertz wave detector (9) imaging, and imaging data is input to computing machine (10) and carries out real-time online process and display.
Described continuous wave terahertz emission source (1) is backward wave oscillator, quantum cascade laser or co2 laser pumping continuous wave terahertz emission source.
Described collimating and beam expanding system (2) is Kepler-type or Galilean type collimating and beam expanding system.
Embodiment
Select the U.S. to be concerned with the SIFIR-50co2 laser pumping continuous wave terahertz emission source of company, regulating frequency is to 2.52THz.High Resistivity Si thickness h=400 μm of design, the radius of high resistant silicon chip is r=25mm, High Resistivity Si resistivity 10000 Ω cm, tunable Argon ion laser operation wavelength 514nm, beam diameter 0.75mm, power 2W.The THz wave of corresponding frequencies is made to focus on default High Resistivity Si centre position.Terahertz wave detector (9) selects the IRV-T0831C focal plane arrays (FPA) camera of Japanese NEC Corporation, and be connected with computing machine (10) by USB interface, detection sensitivity is high, and real-time is good.
Claims (6)
1. a continuous wave Terahertz Real-time Water print imaging detection device, is characterized in that: this device comprises continuous wave terahertz emission source (1), collimating and beam expanding system (2), high resistant silicon chip (3), Argon ion laser (4), the first off axis paraboloidal mirror (5), the second off axis paraboloidal mirror (6), sample stage (7), the 3rd off axis paraboloidal mirror (8), terahertz wave detector (9) and computing machine (10);
Described Terahertz wave source (1) connects collimating and beam expanding system (2), high resistant silicon chip (3), the first off axis paraboloidal mirror (5), the second off axis paraboloidal mirror (6), sample stage (7), the 3rd off axis paraboloidal mirror (8), terahertz wave detector (9) and computing machine (10) successively;
Described Argon ion laser (4) is irradiated on high resistant silicon chip (3).
2. a kind of continuous wave Terahertz Real-time Water print imaging detection device according to claim 1, is characterized in that: described continuous wave terahertz emission source (1) is backward wave oscillator, quantum cascade laser or co2 laser pumping continuous wave terahertz emission source.
3. a kind of continuous wave Terahertz Real-time Water print imaging detection device according to claim 1, is characterized in that: described collimating and beam expanding system (2) is Kepler-type or Galilean type collimating and beam expanding system.
4. a kind of continuous wave Terahertz Real-time Water print imaging detection device according to claim 1, is characterized in that: described high resistant silicon chip (3) thickness h=400 μm, radius r=25mm, resistivity 10000 Ω cm.
5. a kind of continuous wave Terahertz Real-time Water print imaging detection device according to claim 1, is characterized in that: described terahertz wave detector (9) is focal plane array detector.
6. a kind of continuous wave Terahertz Real-time Water prints imaging detection device according to claim 1 or 5, it is characterized in that: described terahertz wave detector (9) selects the IRV-T0831C focal plane arrays (FPA) camera of Japanese NEC Corporation.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105181697A (en) * | 2015-09-18 | 2015-12-23 | 首都师范大学 | Detecting device and method for continuous wave terahertz real-time watermark imaging |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105181697A (en) * | 2015-09-18 | 2015-12-23 | 首都师范大学 | Detecting device and method for continuous wave terahertz real-time watermark imaging |
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Granted publication date: 20160217 Termination date: 20190918 |
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