CN116223420A - Terahertz gas detection system and method based on high-temperature superconducting YBCO bicrystal junction - Google Patents
Terahertz gas detection system and method based on high-temperature superconducting YBCO bicrystal junction Download PDFInfo
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- 238000001514 detection method Methods 0.000 title claims abstract description 39
- 229910021521 yttrium barium copper oxide Inorganic materials 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 8
- 239000013078 crystal Substances 0.000 claims abstract description 13
- 239000004809 Teflon Substances 0.000 claims abstract description 11
- 229920006362 Teflon® Polymers 0.000 claims abstract description 11
- 239000007789 gas Substances 0.000 claims description 80
- 238000010521 absorption reaction Methods 0.000 claims description 17
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- 229910052710 silicon Inorganic materials 0.000 claims description 4
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- 238000011010 flushing procedure Methods 0.000 claims description 3
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- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 description 2
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- 238000002059 diagnostic imaging Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000011151 fibre-reinforced plastic Substances 0.000 description 1
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- 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
- G01N21/3504—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for analysing gases, e.g. multi-gas analysis
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- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
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- 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
- G01N21/3586—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 by Terahertz time domain spectroscopy [THz-TDS]
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention discloses a terahertz gas detection system and method based on high-temperature superconducting YBCO bicrystal, comprising a gas cavity; a pair of gas valves for in-out are arranged on the gas cavity; one side of the gas cavity is provided with a terahertz source which is used for transmitting terahertz signals; the two sides of the gas cavity are provided with Teflon terahertz transparent windows, two off-axis parabolic mirrors are respectively arranged on the two sides of the left Teflon terahertz transparent window and the right Teflon terahertz transparent windows, a high-temperature superconductive YBCO bicrystal and a sample frame are arranged below one of the off-axis parabolic mirrors, the high-temperature superconductive YBCO bicrystal and the sample frame are fixed on a hypersilicon hemispherical lens, and the whole body of the high-temperature superconductive YBCO bicrystal is arranged in a Dewar in a low-temperature environment. According to the gas detector based on the high-temperature superconductive YBCO double crystal structure, a reliable and effective gas detection method can be obtained by constructing the detection system of the technical scheme.
Description
Technical Field
The invention relates to a terahertz gas detection system and method based on high-temperature superconducting YBCO bicrystal junctions, and belongs to the field of terahertz and superconducting.
Background
Terahertz waves are widely focused by people because of the unique properties, and have great application prospects in the fields of material identification, safety inspection, nondestructive detection, wireless communication, radio astronomy, medical imaging and the like. Terahertz waves can detect low-concentration gas through meteorological substances, so that gas leakage can be found as early as possible to control environmental pollution, and potential danger is avoided. Different gases have different absorption peaks in the terahertz frequency band, so that the gas components can be distinguished by using terahertz spectrum detection; the concentration of the gas can also be calculated from the size of the absorption peak. The detection of gases at low concentrations requires a sensitive terahertz detector.
The superconductive josephson junction has great potential in the fabrication of high frequency devices such as transmitters, voltage standards, sensitive detectors and mixers. In particular, high temperature superconductive YBa 2 Cu 3 O 7-δ The (YBCO) has higher critical temperature and larger energy gap, and the cut-off frequency of the Josephson junction prepared by the material is high, so that the device is an ideal detection device of a terahertz wave band. The frequency resolution of the spectrum detector based on the high-temperature superconductive YBCO bicrystal junction is as high as 0.04GHz at 114GHz and as high as 2GHz at 1.78 GHz. The YBCO bicrystal junction can be used as a sensitive terahertz direct detector and a sensitive superheterodyne detector. As the higher harmonic mixer, the low frequency resolution of the local oscillator is used for exchanging the high frequency resolution in the terahertz frequency band. Therefore, the high-temperature superconductive YBCO double crystal is a powerful candidate high-sensitivity high-precision detection device for gas detection. At present, a gas detection system based on high-temperature superconductive YBCO double crystal junction is not yet developed and needs to be built urgently.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a terahertz gas detection system and a terahertz gas detection method based on high-temperature superconducting YBCO bicrystal junctions, so as to solve the technical problems.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: a terahertz gas detection system based on high-temperature superconducting YBCO bicrystal junction comprises a gas cavity; a pair of gas valves for in-out are arranged on the gas cavity; one side of the gas cavity is provided with a terahertz source which is used for transmitting terahertz signals; the two sides of the gas cavity are provided with Teflon terahertz transparent windows, two off-axis parabolic mirrors are respectively arranged on the two sides of the left Teflon terahertz transparent window and the right Teflon terahertz transparent windows, a high-temperature superconductive YBCO bicrystal and a sample frame are arranged below one of the off-axis parabolic mirrors, the high-temperature superconductive YBCO bicrystal and the sample frame are fixed on a hypersilicon hemispherical lens, and the whole body of the high-temperature superconductive YBCO bicrystal is arranged in a Dewar in a low-temperature environment.
Further, the power supply module is also included; the power module comprises a current source which is used for storing the detected voltage signal and the biased current signal into the computer through the data acquisition card.
Further, the microwave generator is also included; the microwave signal generating source is used for sending local oscillation signals, irradiating the local oscillation signals onto the super-silicon hemispherical lens through the dipole antenna, mixing the local oscillation signals with terahertz signals, isolating low-frequency alternating current signals through the capacitor, outputting the low-frequency alternating current signals to the low-frequency amplifier through the coaxial line, finally accessing the frequency spectrograph, detecting the mixed low-frequency signals, and determining the accurate position of each gas absorption peak.
A detection method of a terahertz gas detection system based on high-temperature superconducting YBCO double crystal junction comprises the following steps:
step one: before gas detection, vacuumizing the gas cavity, and under the vacuum condition, detecting the voltage value of a superconductive YBCO bicrystal under certain specific current bias under the irradiation of a terahertz source to obtain a voltage-frequency curve relationship diagram (V-f) of the detector and the terahertz source under vacuum;
step two: the method comprises the steps of (1) flushing gas to be detected into a gas cavity, and detecting the voltage value of a super-conduction YBCO bicrystal under the same specific current bias under the irradiation of a terahertz source to obtain a voltage-frequency curve relationship diagram (V' -f) of a detector under the gas and the terahertz source;
step three: the terahertz frequency spectrum V'/V of the mixed gas can be obtained in the direct detection mode, and the gas components are judged by comparing fixed absorption peaks of different gases under the terahertz frequency;
step four: if the absorption peak cannot be detected due to a small amount of gas, a superheterodyne detection mode is adopted, and a microwave local oscillation signal is introduced in the superheterodyne detection mode to perform n (n)>100 Harmonic mixing; local oscillation frequency f LO Emitted by a microwave signal generator, terahertz frequency f THz From a terahertz source, the resulting intermediate frequency signal f IF Can be checked in a spectrometer; according to the mixing principle, the frequency parameter satisfies f IF ＝|f THz -nf LO I (I); according to the power value comparison P of intermediate frequency signals when the gas cavity on the spectrometer is filled with gas and vacuumized IF ’/P IF The accurate position of the absorption peak, P, can be judged IF ’/P IF If not equal to 1, the peak is a gas absorption peak, and the gas component is determined.
The beneficial effects of the invention are as follows: according to the gas detector based on the high-temperature superconductive YBCO double crystal structure, a reliable and effective gas detection method can be obtained by constructing the detection system of the technical scheme.
Drawings
FIG. 1 is a schematic diagram of a gas detection system based on a high temperature superconducting YBCO bicrystal.
In the figure: 1. the device comprises a gas cavity, 2, a gas valve, 3, a terahertz source, 4, an off-axis parabolic mirror, 5, a Teflon terahertz transparent window, 6, a superconducting YBCO double crystal and a sample frame, 7, a hypersilicon hemispherical lens, 8, a Dewar, 9, a current source, 10, a data acquisition card, 11, a computer, 12, a microwave signal generating source, 13, a dipole antenna, 14, a capacitor, 15, a coaxial line, 16, a low-frequency amplifier, 17 and a spectrometer.
Detailed Description
The present invention will be further described in detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the detailed description and specific examples, while indicating the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, and the terms used herein in this description of the invention are for the purpose of describing particular embodiments only and are not intended to be limiting of the invention.
The invention provides a gas detection system and a method based on high-temperature superconductive YBCO double crystal, and a system schematic diagram is shown in figure 1. The gas to be measured is introduced and withdrawn through a pair of gas valves 2 on the gas chamber 1. The terahertz signal is emitted by a terahertz source 3 and passes through a teflon terahertz transparent window 5 on the gas chamber 1 by a pair of off-axis parabolic mirrors 4. The double crystal of superconducting YBCO and the sample frame are integrated into a whole 6, fixed on a super-silicon hemispherical lens 7, placed in a Dewar 8 in a low-temperature environment, and used for detecting terahertz signals coming in from a Du Watai Hz transparent window. The detected voltage signal and the biased current signal are saved to a computer 11 through a self-made current source 9 by a data acquisition card 10. In the superheterodyne detection mode, the local oscillation signal is generated by the microwave signal generating source 12, irradiated onto the superheterosilicate hemispherical lens 7 through the dipole antenna 13, mixed with the terahertz signal, isolated by the capacitor 14 to obtain a low-frequency alternating current signal, output to the low-frequency amplifier 16 through the coaxial line 15, and finally connected to the spectrometer 17 to detect the mixed low-frequency signal, thereby determining the precise position of each gas absorption peak.
The specific working principle is as follows, before the gas detection, the gas cavity 1 is required to be vacuumized, under the vacuum condition, the voltage value of the superconducting YBCO bicrystal under certain specific current bias is detected under the irradiation of the terahertz source 3, and a curve relation diagram (V-f) of the voltage-frequency of the detector and the terahertz source under the vacuum is obtained; the method comprises the steps of (1) flushing gas to be detected into a gas cavity 1, and detecting a voltage value of a super-conduction YBCO bicrystal under the irradiation of a terahertz source 3 under the same specific current bias to obtain a voltage-frequency curve relationship diagram (V' -f) of a detector under the gas and the terahertz source; the terahertz frequency spectrum V'/V of the mixed gas can be obtained in the direct detection mode, and the gas components are judged by comparing fixed absorption peaks of different gases under the terahertz frequency.
If the absorption peak cannot be detected due to a small amount of gas, the superheterodyne detection mode is employed. Introducing microwave local oscillation signal, and performing n (n)>100 Number of times)Harmonic mixing. Local oscillation frequency f LO Emitted by the microwave signal generator 12, terahertz frequency f THz From a terahertz source 3, an intermediate frequency signal f is generated IF Can be viewed in the spectrometer 17. According to the mixing principle, the frequency parameter satisfies f IF ＝|f THz -nf LO | a. The invention relates to a method for producing a fibre-reinforced plastic composite. According to the power value comparison P of intermediate frequency signals when the gas cavity on the spectrometer is filled with gas and vacuumized IF ’/P IF The accurate position of the absorption peak, P, can be judged IF ’/P IF If not equal to 1, the peak is a gas absorption peak, and the gas component is determined.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, or alternatives falling within the spirit and principles of the invention.
Claims (4)
1. The terahertz gas detection system based on the high-temperature superconducting YBCO double crystal is characterized by comprising a gas cavity (1); a pair of gas valves (2) for inlet and outlet are arranged on the gas cavity (1); one side of the gas cavity (1) is provided with a terahertz source (3) for transmitting terahertz signals; the two sides of the gas cavity (1) are provided with Teflon terahertz transparent windows (5), two off-axis parabolic mirrors (4) are respectively arranged on the two sides of the left Teflon terahertz transparent window (5) and the right Teflon terahertz transparent window (5), a high-temperature superconductive YBCO double crystal and a sample frame (6) are arranged below one of the off-axis parabolic mirrors (4), the high-temperature superconductive YBCO double crystal and the sample frame are fixed on a super-silicon hemispherical lens (7), and the whole of the high-temperature superconductive YBCO double crystal and the sample frame are arranged in a Dewar (8) in a low-temperature environment.
2. The terahertz gas detection system based on high-temperature superconducting YBCO bicrystal of claim 1, further comprising a power supply module; the power module comprises a current source (9) which is used for storing the detected voltage signal and the biased current signal into a computer (11) through a data acquisition card (10).
3. The terahertz gas detection system based on high-temperature superconducting YBCO bicrystal according to claim 1, further comprising a microwave signal generation source (12); the microwave signal generating source (12) is used for emitting local oscillation signals, irradiating the local oscillation signals onto the super-silicon hemispherical lens (7) through the dipole antenna (13), mixing the local oscillation signals with terahertz signals, isolating low-frequency alternating current signals through the capacitor (14), outputting the low-frequency alternating current signals to the low-frequency amplifier (16) through the coaxial line (15), and finally accessing the spectrometer (17) to detect the mixed low-frequency signals, so that the accurate position of each gas absorption peak is determined.
4. The detection method of the terahertz gas detection system based on the high-temperature superconducting YBCO double crystal junction is characterized by comprising the following steps of:
step one: before gas detection, vacuumizing the gas cavity (1), and under the vacuum condition, detecting the voltage value of the superconducting YBCO bicrystal under certain specific current bias under the irradiation of the terahertz source (3), so as to obtain a voltage-frequency curve relationship diagram (V-f) of the detector and the terahertz source under the vacuum;
step two: the method comprises the steps of (1) flushing gas to be detected into a gas cavity, and detecting a voltage value of a super-conduction YBCO bicrystal under the same specific current bias under the irradiation of a terahertz source (3) to obtain a voltage-frequency curve relationship diagram (V' -f) of a detector under the gas and the terahertz source;
step three: the terahertz frequency spectrum V'/V of the mixed gas can be obtained in the direct detection mode, and the gas components are judged by comparing fixed absorption peaks of different gases under the terahertz frequency;
step four: if the absorption peak cannot be detected due to a small amount of gas, a superheterodyne detection mode is adopted, and a microwave local oscillation signal is introduced in the superheterodyne detection mode to perform n (n)>100 Harmonic mixing; local oscillation frequency f LO Emitted by a microwave signal generator (12), terahertz frequency f THz From a terahertz source (3), an intermediate frequency signal f is generated IF Is viewable in a spectrometer (17); according to the mixing principle, the frequency parameter satisfies f IF ＝|f THz -nf LO I (I); according to the power value comparison P of intermediate frequency signals when the gas cavity on the spectrometer is filled with gas and vacuumized IF ’/P IF Can be obtained byJudging the accurate position of the absorption peak, P IF ’/P IF If not equal to 1, the peak is a gas absorption peak, and the gas component is determined.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020067480A1 (en) * | 1999-06-21 | 2002-06-06 | Hamamatsu Photonics K. K. | Terahertz wave spectrometer |
| CN103134983A (en) * | 2011-11-26 | 2013-06-05 | 中国科学院紫金山天文台 | Terahertz coherent detection system based on single mixer and method |
| CN103175609A (en) * | 2013-03-04 | 2013-06-26 | 南京大学 | Device using high-temperature superconducting YBCO (yttrium barium copper oxide) bicrystal junction for detecting terahertz radiation of high-temperature superconducting BSCCO (bismuth strontium calcium copper oxide) |
| CN105675531A (en) * | 2016-03-22 | 2016-06-15 | 南京大学 | Device for detecting terahertz absorption spectra of gas |
| CN108195792A (en) * | 2017-12-25 | 2018-06-22 | 中国科学院紫金山天文台 | A kind of terahertz wave band atmospheric emission spectral line measurement device of based superconductive detector |
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Patent Citations (5)
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|---|---|---|---|---|
| US20020067480A1 (en) * | 1999-06-21 | 2002-06-06 | Hamamatsu Photonics K. K. | Terahertz wave spectrometer |
| CN103134983A (en) * | 2011-11-26 | 2013-06-05 | 中国科学院紫金山天文台 | Terahertz coherent detection system based on single mixer and method |
| CN103175609A (en) * | 2013-03-04 | 2013-06-26 | 南京大学 | Device using high-temperature superconducting YBCO (yttrium barium copper oxide) bicrystal junction for detecting terahertz radiation of high-temperature superconducting BSCCO (bismuth strontium calcium copper oxide) |
| CN105675531A (en) * | 2016-03-22 | 2016-06-15 | 南京大学 | Device for detecting terahertz absorption spectra of gas |
| CN108195792A (en) * | 2017-12-25 | 2018-06-22 | 中国科学院紫金山天文台 | A kind of terahertz wave band atmospheric emission spectral line measurement device of based superconductive detector |
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