CN105181697A - Detecting device and method for continuous wave terahertz real-time watermark imaging - Google Patents
Detecting device and method for continuous wave terahertz real-time watermark imaging Download PDFInfo
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- CN105181697A CN105181697A CN201510593343.8A CN201510593343A CN105181697A CN 105181697 A CN105181697 A CN 105181697A CN 201510593343 A CN201510593343 A CN 201510593343A CN 105181697 A CN105181697 A CN 105181697A
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Abstract
The invention discloses a detecting device and method for continuous wave terahertz real-time watermark imaging. The detecting device comprises a continuous wave terahertz radiation source, a collimating beam-expanding system, a high-resistance silicon wafer, an argon ion laser, an off-axis parabolic lens, a sample platform, a terahertz wave detector and a computer. According to the detecting device provided by the invention, the collimating beam-expanding system is utilized to collimate the terahertz wave into parallel beams; the off-axis parabolic lens is used for expanding the beams for the second time; after the beams penetrate through a sample, the beams are focused on the terahertz wave detector; the computer is used for performing real-time imaging display on the image; the turning-on/off control on the detecting device is realized by utilizing a fact that whether the argon ion laser beam illuminates on the high-resistance silicon wafer or not. The detecting device for continuous wave terahertz real-time watermark imaging provided by the invention has the advantages of compact structure, high response speed, convenient switching, real-time watermark imaging and significant practical application value, and is also capable of performing non-destructive detection on the hazardous metal hidden in the packaging articles such as newspaper, fabrics and plastics.
Description
Technical field
The present invention relates to a kind of imaging detection device and formation method thereof, relate to a kind of continuous wave Terahertz Real-time Water print imaging detection device and formation method thereof 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 and formation method, the invention provides simple, the easy to operate THz wave Real-time Water print imaging detection device of a kind of structure and formation method.
The present invention 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.
A kind of continuous wave Terahertz Real-time Water print imaging detection method, comprises the following steps:
A. continuous wave terahertz emission source (1) launches terahertz signal, signal collimating and beam expanding system (2) carries out secondary by the first off axis paraboloidal mirror (5) and the second off axis paraboloidal mirror (6) afterwards and expands, and then transfers to sample stage (7);
B. to converge through the 3rd off axis paraboloidal mirror (8) from sample transmission terahertz signal out and transfer to described terahertz wave detector (9);
C. the convergence THz wave received is converted to electric signal and is input to computing machine (10) by described terahertz wave detector (9);
D. carry software by terahertz wave detector (9) and real time imagery display is carried out to image;
E. whether be irradiated on high resistant silicon chip by tunable Argon ion laser (4), realize controlling the open and close of THz wave, and then realize controlling the imaging frame number of this imaging system.
The invention has the advantages that:
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 present invention's 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 image device structure figure of the present invention
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.
A kind of continuous wave Terahertz Real-time Water print imaging detection method, comprises the following steps:
A. continuous wave terahertz emission source (1) launches terahertz signal, signal collimating and beam expanding system (2) carries out secondary by the first off axis paraboloidal mirror (5) and the second off axis paraboloidal mirror (6) afterwards and expands, and then transfers to sample stage (7);
B. to converge through the 3rd off axis paraboloidal mirror (8) from sample transmission terahertz signal out and transfer to described terahertz wave detector (9);
C. the convergence THz wave received is converted to electric signal and is input to computing machine (10) by described terahertz wave detector (9);
D. carry software by terahertz wave detector (9) and real time imagery display is carried out to image;
E. whether be irradiated on high resistant silicon chip by Argon ion laser (4), can decide THz wave by high resistant silicon chip, to realize the open and close to THz wave, when without additional argon laser, high resistant silicon chip is undamped to THz wave, and THz wave can pass through high resistant silicon chip; When there being additional argon laser, because high resistant silicon chip inside produces photoexcitation carrier, charge carrier produces absorption to THz wave, now high resistant silicon chip has decay to THz wave, THz wave, not by High Resistivity Si sheet, is controlled by the imaging frame number of tuning Argon ion laser (4) to this imaging system.
Claims (7)
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 tunable 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 print imaging detection device according to claim 1 and 5, is characterized in that: described terahertz wave detector (9) selects the IRV-T0831C focal plane arrays (FPA) camera of Japanese NEC Corporation.
7. a continuous wave Terahertz Real-time Water print imaging detection method, comprises the following steps:
A. continuous wave terahertz emission source (1) launches terahertz signal, signal collimating and beam expanding system (2) carries out secondary by the first off axis paraboloidal mirror (5) and the second off axis paraboloidal mirror (6) afterwards and expands, and then transfers to sample stage (7);
B. to converge through the 3rd off axis paraboloidal mirror (8) from sample transmission terahertz signal out and transfer to described terahertz wave detector (9);
C. the convergence THz wave received is converted to electric signal and is input to computing machine (10) by described terahertz wave detector (9);
D. carry software by terahertz wave detector (9) and real time imagery display is carried out to image;
E. whether be irradiated on high resistant silicon chip by tunable Argon ion laser (4), realize controlling the open and close of THz wave, and then realize controlling the imaging frame number of this imaging system.
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| CN106066497A (en) * | 2016-07-05 | 2016-11-02 | 成都福兰特电子技术股份有限公司 | A kind of terahertz imaging system for safety check |
| CN106769994A (en) * | 2017-01-19 | 2017-05-31 | 中国科学院上海技术物理研究所 | A kind of Terahertz sub-wavelength resolution imaging device |
| CN106932357A (en) * | 2017-03-09 | 2017-07-07 | 南开大学 | A kind of super diffraction limit of resolution terahertz light spectrum imaging system |
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| CN106932357A (en) * | 2017-03-09 | 2017-07-07 | 南开大学 | A kind of super diffraction limit of resolution terahertz light spectrum imaging system |
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Application publication date: 20151223 |