CN203011574U - A burning temperature sensing device based on terahertz pulse measurement - Google Patents
A burning temperature sensing device based on terahertz pulse measurement Download PDFInfo
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- CN203011574U CN203011574U CN 201320024761 CN201320024761U CN203011574U CN 203011574 U CN203011574 U CN 203011574U CN 201320024761 CN201320024761 CN 201320024761 CN 201320024761 U CN201320024761 U CN 201320024761U CN 203011574 U CN203011574 U CN 203011574U
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Abstract
The utility model discloses a burning temperature sensing device based on terahertz pulse measurement. A laser is emitted from a femtosecond laser device and is divided into a reference laser and a detection laser by a beam splitter. The detection laser focuses on a photoconductive antenna terahertz emitter. A terahertz pulse emitted from the terahertz emitter converges on a ZnTe crystal through an off-axis paraboloid mirror group. Passing semi-transparent reflectors, a parallel grating group, and polaroids, the reference laser is collimated and superposed on a terahertz wave accumulated on the ZnTe crystal. Modulation of the terahertz wave is achieved by using the Pockels effect of the ZnTe crystal. Image information is inputted into a computer by a CCD detector to be processed subsequently, wherein the image information corresponds to an acquired first reference laser carrying terahertz pulse intensity information and an acquired second reference laser not carrying terahertz pulse intensity information. The burning temperature sensing device increases the precision and speed of a non-contact burning measurement method and achieves non-contact measurement of temperature and temperature distribution of a burning object.
Description
Technical field
The utility model belongs to burning detection technique field, relates in particular to a kind of temperature of combustion sensing device of measuring based on terahertz pulse.
Background technology
Combustion phenomena is present in numerous industries such as petrochemical complex, space flight, metallurgy and electric power widely.Chemical energy constantly is converted to heat energy and electric energy in the combustion reaction process, constantly conducts heat simultaneously, mass transfer and chemical reaction process.Can produce the gaseous products such as carbon dioxide, carbon monoxide, oxynitrides, sulphuric dioxide and water vapor releases heat simultaneously in combustion process.For guaranteeing the sustainable development of China's economic, China in Recent Years government and scientific and technological circle pay attention to research and the application that energy efficiency improves more.Therefore especially yet because combustion process is very complicated, need to use novel burning detection technique among the analysis of burning and research, thereby promote efficient, the combustion model of environmental protection and the foundation of pollution formation model.Temperature is crucial parameter in the testing process of burning, and the real-time Measurement accuracy of temperature of combustion and Temperature Distribution all has important effect for all many-sides such as safety in production, raising burning efficiency, reduction pollutants.
The temperature of combustion sensing measuring method can be divided into two classes substantially on principle: contact measurement method and contactless measurement.Wherein, the cardinal principle of contact type measurement is to utilize the heat-sensitive elements such as thermopair, thermal resistance that the variation of voltage or resistance can occur when temperature variation, thereby obtains the value of temperature.The patent No. is the measurement that CN102607731A's " thermocouple temperature sensor of fast response time " thermopair that will be enclosed with protection tube and Metal Packaging layer is used for temperature.The patent No. is that CN102483360A's " fibre optic temperature sensor " light quantity of accepting after by the light reflection that changes the covered light quantity of light that transmitted by optical fiber or transmission is come the sensing detection temperature.The characteristics of contact type measurement be with low cost, measure reliably, be one of measuring method of widespread use the most at present.But the metering system of contact can produce disturbance to measurand, and it is measured response and often can't follow the tracks of fast-changing temperature, and sensitive element is easy to be subject to the pollution of high temperature or corrosive gas medium and reduces reliability.In addition, utilize the contact type measurement of single thermopair or thermal resistance to measure single-point, can't understand the truth of whole burning object inside.Another important directions that non-contacting measuring method is combustion temperature measurement, contactless measuring technique method has comprised optical method, the method for acoustic method etc. a new generations, they mainly utilize light wave or acoustic signals that the response of different temperatures is realized measuring.The patent No. be CN1388340A's " measuring method and the system thereof of boiler combustion radiation energy and temperature field and control combustion " utilize CCD to gather burning image, measure the temperature of burning by the mode that image is processed.The patent No. be CN1587930A's " three dimension temperature field realtion monitor in coal burning boiler " accept radiation information from all directions in burner hearth by the method that a plurality of cameras are set in burner hearth, adopt special noniterative algorithm to calculate the distribution of burner hearth internal combustion temperature.The advantage of contactless measurement is fast response time, measures can not produce burning object and disturbs.Along with science and technology and the progress of yield-power, study quick, highly sensitive temperature of combustion method for sensing and can help people to deepen research to combustion mechanism, can help again people to carry out analysis and control to the pollutant that produces in combustion process.
Summary of the invention
The purpose of this utility model is for the deficiencies in the prior art, a kind of temperature of combustion sensing device of measuring based on terahertz pulse is proposed, improve precision and the measuring speed of existing noncontact combustion measurement method, realize the non-cpntact measurement of temperature and the Temperature Distribution of burning object.
The technical scheme that its technical matters that solves the utility model adopts is as follows:
The utility model comprises femto-second laser, beam splitter, the first plane mirror, the second plane mirror, the 3rd plane mirror, condenser lens, photoconductive antenna type terahertz transmitter, off axis paraboloidal mirror group, the first semi-transparent reflection mirror, the second semi-transparent reflection mirror, parallel grating group, plane mirror, the first polaroid, the second polaroid, ito glass, ZnTe crystal, ccd detector, computing machine, function generator, high frequency power amplifier, one dimensional optical translation stage.
laser is launched from femto-second laser, after the beam splitter light splitting, be divided into reference laser and exploring laser light two-way, wherein exploring laser light is successively by the first plane mirror, the second plane mirror, focused on photoconductive antenna type terahertz transmitter by condenser lens after the 3rd plane mirror reflection, photoconductive antenna type terahertz transmitter is launched terahertz pulse under the voltage drive effect of exploring laser light and high frequency power amplifier, become parallel THz wave after the collimation of terahertz pulse through the off axis paraboloidal mirror of off axis paraboloidal mirror group one side, and pass the combustion zone, the off axis paraboloidal mirror of opposite side converges to parallel THz wave on the ZnTe crystal, the reference laser that beam splitter is told incides on pair of parallel grating group after through the first semi-transparent reflection mirror, reference laser through the parallel grating group is reflected back the parallel grating group by plane mirror, thereby frequency chirp and the time explanation of reference laser have been realized, reference laser after time explanation passes through the first polaroid by the first semi-transparent reflection mirror reflection, reference laser through the first polaroid is reflexed on the ZnTe crystal by ito glass, overlap with the THz wave collimation that converges on the ZnTe crystal, utilize Pockels (Pockels) effect of ZnTe crystal to realize the Terahertz wave modulation, after the first reference laser that polarization state is modulated by THz wave passes the second semi-transparent reflection mirror, again through the second polaroid, carry the first reference laser of terahertz pulse strength information and surveyed acceptance by Siping City's face mirror reflects to ccd detector, while is due to the birefringence effect of ZnTe crystal, do not carry the second reference laser of terahertz pulse strength information through the second semi-transparent reflection mirror, the 6th plane mirror, also incide ccd detector after the 5th plane mirror reflection and be detected reception, the first reference laser that carries the terahertz pulse strength information that ccd detector will collect and the second corresponding picture signal of the reference laser input computing machine that does not carry the terahertz pulse strength information carry out subsequent treatment.Function generator produces the fundamental frequency sine wave signal and is input to high frequency power amplifier, high frequency power amplifier drives photoconductive antenna type terahertz transmitter cycle generation terahertz pulse, and the sampling period that the frequency multiplication square-wave signal of the frequency multiplication of function generator generation is simultaneously controlled ccd detector is the twice of terahertz pulse transmission frequency.
Described parallel grating group is one group of grating of parallel placement, and input path is returned in the reference laser pulse-echo of plane mirror after with parallel grating group chirp spread.
Described ito glass makes the reference laser pulse that reflexes on the ZnTe crystal and the terahertz pulse concurrent that converges on the ZnTe crystal coaxial.
The first plane mirror, the second plane mirror have been placed on described one dimensional optical translation stage, terahertz pulse is positioned in the duration of synchronizing detection pulse by the optical delay method, by the adjustment of one dimensional optical translation stage, the image space of terahertz pulse is adjusted to the middle section of ccd detector simultaneously.
Described function generator produces the voltage signal of two kinds of different frequencies, is respectively fundamental frequency sine wave pulse signal and frequency multiplication rectangular wave pulse signal.The fundamental frequency sine wave signal is input to high frequency power amplifier, through being loaded into the periodic voltage excitation that forms photoconductive antenna on photoconductive antenna type terahertz transmitter after amplifying, when inciding on photoconductive antenna type terahertz transmitter, exploring laser light produces the photo-generated carrier of moment, photo-generated carrier gives off terahertz pulse under positive half cycle sinusoidal voltage excitation, photo-generated carrier goes out terahertz pulse with non-radiating under the excitation of negative half period sinusoidal voltage.The frequency multiplication rectangular wave pulse signal is input to ccd detector as the sample-synchronous signal of ccd detector, because frequency multiplication rectangular wave pulse signal and fundamental frequency sine wave signal frequency differ one times, therefore in two frame ccd images of adjacent collection, a frame is the image that terahertz pulse exists, one frame is the image that there is no terahertz pulse, method by CCD times of frequency sampling has realized the dynamic correction of measuring, and has improved the signal to noise ratio (S/N ratio) of systematic survey.
The utility model beneficial effect is as follows:
The first, the temperature of combustion sensing device of measuring based on terahertz pulse uses the parallel grating group to realize frequency chirp and time explanation, thereby has realized the wavelength-division electro-optic sampling of terahertz pulse.By changing sine wave and rect.p. wave frequency and the phase place of signal generator, the clock period of the terahertz pulse that photoconductive antenna type terahertz transmitter gives off and CCD sampling is synchronous, thereby the sampling process that realizes a CCD just can obtain the measurement of a terahertz pulse, realizes obtaining fast the effect of burning object tera-hertz spectra.Because the frequency of the sampling of CCD can be very fast, therefore the temperature of combustion sensing device of measuring based on terahertz pulse can carry out data acquisition to burning object with higher sampling rate, is particularly suitable for this class dynamic change of flame combustion real-time measurement of object faster and the needs of analysis.Therefore the temperature of combustion sensing device of measuring based on terahertz pulse can in the conflagration change procedure, adopt non-contacting mode to measure the tera-hertz spectra data of burning object under the condition of not disturbing combustible substance to distribute.
The second, be a kind of electromagenetic wave radiation of low temperature due to terahertz emission, so a large amount of background infrared radiation noises that produce in combustion process do not produce interference substantially to the measurement of terahertz pulse, when therefore using terahertz pulse to measure, signal to noise ratio (S/N ratio) is high especially.The temperature of combustion sensing device of measuring based on terahertz pulse can realize based on the thermometry of infrared radiation measurement, higher signal to noise ratio (S/N ratio) and precision being arranged than tradition.
The 3rd, photoconductive antenna type terahertz transmitter can be launched wavelength coverage in the THz wave of 0.1～7THz, because the frequency spectrum of the THz wave of launching has covered a large amount of combustion product gas, therefore can realize completing H in the one-shot measurement process
2O, CO, CO
2, NO, NO
2, NH
3And SO
2Monitoring Deng gas.Simultaneously because terahertz emission is high by 10 for the remolding sensitivity traditional infrared radiation of burning gases
3Above, the temperature of combustion method for sensing of therefore measuring based on terahertz pulse has very high sensitivity.
The 4th, the temperature of combustion sensing device of measuring based on terahertz pulse can be arranged on flexibly according to the actual conditions of burning object the both sides of combustion zone.Owing to only needing a photoconductive antenna type terahertz transmitter as spectral radiation source, the temperature of combustion sensing device structure of therefore measuring based on terahertz pulse is very simple compact.The terahertz pulse data processing method that adopts can realize the data under complicated burning condition are processed and analyzed by uniform temperature distributed model and non-homogeneous temperature distribution model.
Description of drawings
Fig. 1 is the utility model structural representation;
Fig. 2 is photoconductive antenna type terahertz transmitter and CCD sample circuit sequential chart;
In figure, femto-second laser 1, beam splitter 2, the first plane mirror 3-1, the second plane mirror 3-2, the 3rd plane mirror 3-3, condenser lens 4, photoconductive antenna type terahertz transmitter 5, off axis paraboloidal mirror group 6, the first semi-transparent reflection mirror 7-1, the second semi-transparent reflection mirror 7-2, parallel grating group 8, plane mirror 9, the first polaroid 10-1, the second polaroid 10-2, ito glass 11, ZnTe crystal 12, ccd detector 13, computing machine 14, function generator 15, high frequency power amplifier 16, one dimensional optical translation stage 17.
Embodiment
The utility model is described in further detail below in conjunction with accompanying drawing.
as shown in Figure 1, temperature of combustion sensing device based on the terahertz pulse measurement, comprise femto-second laser 1, beam splitter 2, the first plane mirror 3-1, the second plane mirror 3-2, the 3rd plane mirror 3-3, condenser lens 4, photoconductive antenna type terahertz transmitter 5, off axis paraboloidal mirror group 6, the first semi-transparent reflection mirror 7-1, the second semi-transparent reflection mirror 7-2, parallel grating group 8, plane mirror 9, the first polaroid 10-1, the second polaroid 10-2, ito glass 11, ZnTe crystal 12, ccd detector 13, computing machine 14, function generator 15, high frequency power amplifier 16, one dimensional optical translation stage 17.
laser is from femto-second laser 1 emission, after beam splitter 2 light splitting, be divided into reference laser and exploring laser light two-way, wherein exploring laser light is successively by the first plane mirror 3-1, the second plane mirror 3-2, focused on photoconductive antenna type terahertz transmitter 5 by condenser lens 4 after the 3rd plane mirror 3-3 reflection, photoconductive antenna type terahertz transmitter 5 is launched terahertz pulse under the voltage drive effect of exploring laser light and high frequency power amplifier 16, become parallel THz wave after the collimation of terahertz pulse through the off axis paraboloidal mirror of off axis paraboloidal mirror group 6 one sides, and pass the combustion zone, the off axis paraboloidal mirror of opposite side converges to parallel THz wave on ZnTe crystal 12, the reference laser that beam splitter 2 is told incides on pair of parallel grating group 8 after through the first semi-transparent reflection mirror 7-1, reference laser through parallel grating group 8 is reflected back parallel grating group 8 by plane mirror 9, thereby frequency chirp and the time explanation of reference laser have been realized, reference laser after time explanation passes through the first polaroid 10-1 by the first semi-transparent reflection mirror 7-1 reflection, reference laser through the first polaroid 10-1 is reflexed on ZnTe crystal 12 by ito glass 11, overlap with the THz wave collimation that converges on ZnTe crystal 12, utilize Pockels (Pockels) effect of ZnTe crystal 12 to realize the Terahertz wave modulation, after the first reference laser that polarization state is modulated by THz wave passes the second semi-transparent reflection mirror 7-2, again through the second polaroid 10-2, the first reference laser that carries the terahertz pulse strength information is reflexed to ccd detector 13 by the face catoptron 3-4 of Siping City and surveys acceptance, while is due to the birefringence effect of ZnTe crystal 12, do not carry the second reference laser of terahertz pulse strength information through the second semi-transparent reflection mirror 7-2, the 6th plane mirror 3-6, also incide ccd detector 13 after the 5th plane mirror 3-5 reflection and be detected reception, the first reference laser that carries the terahertz pulse strength information that ccd detector 13 will collect and the second corresponding picture signal of the reference laser input computing machine 14 that does not carry the terahertz pulse strength information carry out subsequent treatment.Function generator 15 produces the fundamental frequency sine wave signal and is input to high frequency power amplifier 16, high frequency power amplifier 16 drives photoconductive antenna type terahertz transmitter 5 cycles generation terahertz pulse, and the sampling period of the frequency multiplication square-wave signal control ccd detector 13 of function generator 15 generation frequencys multiplication is twices of terahertz pulse transmission frequency simultaneously.
Described parallel grating group 8 is one group of grating of parallel placement, and input path is returned in the reference laser pulse-echo of plane mirror 9 after with parallel grating group 8 chirp spreads.
Described ito glass 11 makes the reference laser pulse that reflexes on ZnTe crystal 12 and the terahertz pulse concurrent that converges on ZnTe crystal 12 coaxial.
The first plane mirror 3-1, the second plane mirror 3-2 have been placed on described one dimensional optical translation stage 17, terahertz pulse is positioned in the duration of synchronizing detection pulse by the optical delay method, by the adjustment of one dimensional optical translation stage 17, the image space of terahertz pulse is adjusted to the middle section of ccd detector 13 simultaneously.
As shown in Figure 2, function generator 15 produces the voltage signal of two kinds of different frequencies, is respectively fundamental frequency sine wave pulse signal and frequency multiplication rectangular wave pulse signal.The fundamental frequency sine wave signal is input to high frequency power amplifier 16, through being loaded into the periodic voltage excitation that forms photoconductive antenna on photoconductive antenna type terahertz transmitter 5 after amplifying, when inciding on photoconductive antenna type terahertz transmitter 5, exploring laser light produces the photo-generated carrier of moment, photo-generated carrier gives off terahertz pulse under positive half cycle sinusoidal voltage excitation, photo-generated carrier goes out terahertz pulse with non-radiating under the excitation of negative half period sinusoidal voltage.The frequency multiplication rectangular wave pulse signal is input to ccd detector 13 as the sample-synchronous signal of ccd detector 13, because frequency multiplication rectangular wave pulse signal and fundamental frequency sine wave signal frequency differ one times, therefore in two frame ccd images of adjacent collection, a frame is the image that terahertz pulse exists, one frame is the image that there is no terahertz pulse, method by CCD times of frequency sampling has realized the dynamic correction of measuring, and has improved the signal to noise ratio (S/N ratio) of systematic survey.
Claims (1)
1. the temperature of combustion sensing device of measuring based on terahertz pulse, comprise femto-second laser, beam splitter, the first plane mirror, the second plane mirror, the 3rd plane mirror, condenser lens, photoconductive antenna type terahertz transmitter, off axis paraboloidal mirror group, the first semi-transparent reflection mirror, the second semi-transparent reflection mirror, parallel grating group, plane mirror, the first polaroid, the second polaroid, ito glass, ZnTe crystal, ccd detector, computing machine, function generator, high frequency power amplifier, one dimensional optical translation stage, it is characterized in that:
laser is launched from femto-second laser, after the beam splitter light splitting, be divided into reference laser and exploring laser light two-way, wherein exploring laser light is successively by the first plane mirror, the second plane mirror, focused on photoconductive antenna type terahertz transmitter by condenser lens after the 3rd plane mirror reflection, photoconductive antenna type terahertz transmitter is launched terahertz pulse under the voltage drive effect of exploring laser light and high frequency power amplifier, become parallel THz wave after the collimation of terahertz pulse through the off axis paraboloidal mirror of off axis paraboloidal mirror group one side, and pass the combustion zone, the off axis paraboloidal mirror of opposite side converges to parallel THz wave on the ZnTe crystal, the reference laser that beam splitter is told incides on pair of parallel grating group after through the first semi-transparent reflection mirror, reference laser through the parallel grating group is reflected back the parallel grating group by plane mirror, realize frequency chirp and the time explanation of reference laser, reference laser after time explanation passes through the first polaroid by the first semi-transparent reflection mirror reflection, reference laser through the first polaroid is reflexed on the ZnTe crystal by ito glass, overlap with the THz wave collimation that converges on the ZnTe crystal, utilize the Pockels effect of ZnTe crystal to realize the Terahertz wave modulation, after the first reference laser that polarization state is modulated by THz wave passes the second semi-transparent reflection mirror, again through the second polaroid, carry the first reference laser of terahertz pulse strength information and surveyed acceptance by Siping City's face mirror reflects to ccd detector, while is due to the birefringence effect of ZnTe crystal, do not carry the second reference laser of terahertz pulse strength information through the second semi-transparent reflection mirror, the 6th plane mirror, also incide ccd detector after the 5th plane mirror reflection and be detected reception, the first reference laser that carries the terahertz pulse strength information that ccd detector will collect and the second corresponding picture signal of the reference laser input computing machine that does not carry the terahertz pulse strength information carry out subsequent treatment, function generator produces the fundamental frequency sine wave signal and is input to high frequency power amplifier, high frequency power amplifier drives photoconductive antenna type terahertz transmitter cycle generation terahertz pulse, and the sampling period that the frequency multiplication square-wave signal of the frequency multiplication of function generator generation is simultaneously controlled ccd detector is the twice of terahertz pulse transmission frequency,
Described parallel grating group is one group of grating of parallel placement, and input path is returned in the reference laser pulse-echo of plane mirror after with parallel grating group chirp spread;
Described ito glass makes the reference laser pulse that reflexes on the ZnTe crystal and the terahertz pulse concurrent that converges on the ZnTe crystal coaxial;
The first plane mirror, the second plane mirror have been placed on described one dimensional optical translation stage, terahertz pulse is positioned in the duration of synchronizing detection pulse by the optical delay method, by the adjustment of one dimensional optical translation stage, the image space of terahertz pulse is adjusted to the middle section of ccd detector simultaneously;
Described function generator produces the voltage signal of two kinds of different frequencies, is respectively fundamental frequency sine wave pulse signal and frequency multiplication rectangular wave pulse signal; The fundamental frequency sine wave signal is input to high frequency power amplifier, through being loaded into the periodic voltage excitation that forms photoconductive antenna on photoconductive antenna type terahertz transmitter after amplifying, when inciding on photoconductive antenna type terahertz transmitter, exploring laser light produces the photo-generated carrier of moment, photo-generated carrier gives off terahertz pulse under positive half cycle sinusoidal voltage excitation, photo-generated carrier goes out terahertz pulse with non-radiating under the excitation of negative half period sinusoidal voltage; The frequency multiplication rectangular wave pulse signal is input to ccd detector as the sample-synchronous signal of ccd detector, because frequency multiplication rectangular wave pulse signal and fundamental frequency sine wave signal frequency differ one times, therefore in two frame ccd images of adjacent collection, a frame is the image that terahertz pulse exists, one frame is the image that there is no terahertz pulse, realizes the dynamic correction of measurement by the method for CCD times of frequency sampling.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103076107A (en) * | 2013-01-17 | 2013-05-01 | 杭州电子科技大学 | Terahertz pulse measurement-based burning temperature sensing device and method |
| CN104390702A (en) * | 2014-10-31 | 2015-03-04 | 上海光谱仪器有限公司 | Hardware synchronization-free CCD small-sized spectrograph system adopting pulse xenon light source and data acquisition method |
| CN111257713A (en) * | 2019-12-25 | 2020-06-09 | 电子科技大学 | Method for measuring multiple service lives of current carriers in multi-luminous-peak semiconductor material |
| CN111965440A (en) * | 2020-07-02 | 2020-11-20 | 云南大学 | Terahertz receiver noise test system |
| CN112764119A (en) * | 2021-01-20 | 2021-05-07 | 西安理工大学 | Terahertz wave frequency up-conversion detector based on high excited state atoms |
| CN112858212A (en) * | 2021-01-12 | 2021-05-28 | 江西中医药大学 | Method for detecting quality of moxa cone by combining terahertz wave and combustion temperature |
| CN113281297A (en) * | 2021-04-09 | 2021-08-20 | 北京航空航天大学 | Terahertz device for monitoring flame heat release rate pulsation in real time and measuring method |
| CN114295582A (en) * | 2021-12-29 | 2022-04-08 | 福州大学 | Polar liquid reflection type experiment system and measurement method thereof |
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2013
- 2013-01-17 CN CN 201320024761 patent/CN203011574U/en not_active Withdrawn - After Issue
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103076107A (en) * | 2013-01-17 | 2013-05-01 | 杭州电子科技大学 | Terahertz pulse measurement-based burning temperature sensing device and method |
| CN103076107B (en) * | 2013-01-17 | 2014-12-24 | 杭州电子科技大学 | Terahertz pulse measurement-based burning temperature sensing device and method |
| CN104390702A (en) * | 2014-10-31 | 2015-03-04 | 上海光谱仪器有限公司 | Hardware synchronization-free CCD small-sized spectrograph system adopting pulse xenon light source and data acquisition method |
| CN111257713A (en) * | 2019-12-25 | 2020-06-09 | 电子科技大学 | Method for measuring multiple service lives of current carriers in multi-luminous-peak semiconductor material |
| CN111965440A (en) * | 2020-07-02 | 2020-11-20 | 云南大学 | Terahertz receiver noise test system |
| CN112858212A (en) * | 2021-01-12 | 2021-05-28 | 江西中医药大学 | Method for detecting quality of moxa cone by combining terahertz wave and combustion temperature |
| CN112858212B (en) * | 2021-01-12 | 2022-08-16 | 江西中医药大学 | Method for detecting moxa cone mass by combining terahertz wave and combustion temperature |
| CN112764119A (en) * | 2021-01-20 | 2021-05-07 | 西安理工大学 | Terahertz wave frequency up-conversion detector based on high excited state atoms |
| CN112764119B (en) * | 2021-01-20 | 2023-10-27 | 西安理工大学 | Terahertz wave frequency up-conversion detector based on high-excitation-state atoms |
| CN113281297A (en) * | 2021-04-09 | 2021-08-20 | 北京航空航天大学 | Terahertz device for monitoring flame heat release rate pulsation in real time and measuring method |
| CN113281297B (en) * | 2021-04-09 | 2023-01-17 | 北京航空航天大学 | Terahertz device for monitoring flame heat release rate pulsation in real time and measuring method |
| CN114295582A (en) * | 2021-12-29 | 2022-04-08 | 福州大学 | Polar liquid reflection type experiment system and measurement method thereof |
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