CN103630555B - A kind of dangerous liquid material adopts the method for microwave multifrequency point vector detection in detecting - Google Patents
A kind of dangerous liquid material adopts the method for microwave multifrequency point vector detection in detecting Download PDFInfo
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- CN103630555B CN103630555B CN201310588482.2A CN201310588482A CN103630555B CN 103630555 B CN103630555 B CN 103630555B CN 201310588482 A CN201310588482 A CN 201310588482A CN 103630555 B CN103630555 B CN 103630555B
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Abstract
The present invention relates to during a kind of dangerous liquid material detects the method adopting microwave multifrequency point vector detection.Problem to be solved is exactly that background technology exists: plurality of liquid measurement data, between safe product and dangerous material, causes instrument to be reported by mistake, the problem of the sample set expansion of confined liquid safety detector simultaneously.Solving this technical problem adopted drip irrigation device is: adopt how discrete frequency, across S, C, X many frequency ranges, some frequencies are got in each frequency range, measure testing liquid to electromagnetic reflected signal, form the multi-point sampling to liquid dielectric spectrum, reflect that liquid is in the dielectric property of different frequency range, differentiates different liquids by the reflected signal measured; In certain frequency range, electromagnetic reflected signal is difficult to the liquid differentiated, chooses other frequency ranges and differentiate, make mutually to confirm between different frequency range, realize combining resolution to the multifrequency point of testing liquid.The present invention may be used for detecting dangerous liquid material, and accuracy rate significantly improves.
Description
Technical field: the present invention relates to dangerous liquid material detection method is a kind of method adopting microwave multifrequency point vector detection during dangerous liquid material detects specifically.
Background technology: dangerous liquid material detector carries out detecting the instrument identified to dangerous liquid material, in the safety check systems such as civil aviaton, railway, urban track traffic, all needs the liquid article to passenger carries with to detect under the state do not broken a seal.In existing multiple inspection method and equipment, microwave detection method is one of main method, and microwave detection method conventional at present, multiplex single point frequency or comparatively narrow-band, measuring-signal generally only measures its amplitude, under larger sample set, (be more than or equal to 40 kinds), be difficult to reach higher Detection accuracy (being greater than 99% under appointment sample set).In liquid safe detector of the same type, always there is plurality of liquid measurement data between safe product and dangerous material, is the main source that instrument wrong report produces, and is also the main cause of the sample set expansion of confined liquid safety detector.How accurately differentiating these liquid is technical matterss urgently to be resolved hurrily.
Summary of the invention: object of the present invention is exactly a kind of method proposing to adopt during dangerous liquid material detects microwave multifrequency point vector detection, with solve background technology exist: plurality of liquid measurement data is between safe product and dangerous material, instrument is caused to be reported by mistake, simultaneously the sample set expansion of confined liquid safety detector.Solving this technical problem adopted technical scheme is: a kind of dangerous liquid material adopts the method for microwave multifrequency point vector detection in detecting, it is characterized in that adopting how discrete frequency, across S, C, X many frequency ranges, some frequencies are got in each frequency range, measure testing liquid to electromagnetic reflected signal, form the multi-point sampling to liquid dielectric spectrum, reflect that liquid is in the dielectric property of different frequency range, differentiates different liquids by the reflected signal measured; In certain frequency range, electromagnetic reflected signal is difficult to the liquid differentiated, chooses other frequency ranges and differentiate, make mutually to confirm between different frequency range, realize combining resolution to the multifrequency point of testing liquid.Wherein, measure the amplitude of testing liquid reflected signal and phase place two dimensions of information and Vector Message, differentiate different liquids by detected reflectance signal in the distribution of the two dimensional surface of amplitude and phase place.For implementing the configuration-system of the custom-designed emission of radio frequency signals module of said method and receiver module, it is characterized in that emission of radio frequency signals module and receiver module utilize 100MHz constant-temperature crystal oscillator as a reference, according to control protocol, system broad frequency synthesizer produces multiple discrete frequency signal and complete transmitting by braodband directional coupler finally by emissive source after power amplification; Transmit and carry out mixing with the signal by launching wideband frequency synthesizer and power divider launching in broadband mixer, the two frequency-splitting is 50MHz, obtains 50MHz intermediate frequency self-test signal; And reach same phase place through the reflected signal that sensor 1,2 receives through phase shifter adjustment, carry out mixing through switch orientations coupling mechanism group and wideband pre-amplifier and through another road signal of power divider receiving in broadband mixer again, obtain 50MHz received IF signal; The two-way intermediate-freuqncy signal obtained extracts its amplitude and phase characteristic by FPGA process, thus measures vector signal.
The present invention compares had beneficial effect with background technology: according to technique scheme, and because the specific inductive capacity of liquid changes with the change of frequency, the Changing Pattern not between same liquid is also not quite similar, the Changing Pattern do not determined.Thus in a certain frequency range measurement data relatively, the liquid that cannot differentiate, may be able to differentiate in another frequency range.Therefore the present invention adopts how discrete frequency, across multiple frequency range such as S, C, X, some frequencies are got in each frequency range, measure testing liquid to electromagnetic reflected signal, form the multi-point sampling to liquid dielectric spectrum, reflect that liquid is in the dielectric property of different frequency range, differentiates different liquids by the reflected signal measured; In certain frequency range, electromagnetic reflected signal is difficult to the liquid differentiated, chooses other frequency ranges and differentiate, make mutually to confirm between different frequency range, realize combining resolution to the multifrequency point of testing liquid.On the other hand, because dielectric property is different between different liquid, amplitude and the phase place of the reflected signal to be measured measured all can there are differences, therefore the present invention is by measuring amplitude and the phase place two dimensions of information (i.e. its Vector Message) of testing liquid reflected signal, detects different liquids by reflected signal to be measured in the distribution of the two dimensional surface of amplitude and phase place.The inventive method effectively solves plurality of liquid measurement data and causes instrument to report by mistake between safe product and dangerous material, has expanded the sample set of liquid safe detector simultaneously, significantly improves resolution accuracy rate.
Accompanying drawing illustrates: Fig. 1 is the configuration-system ultimate principle block diagram of emission of radio frequency signals module and receiver module.Fig. 2 does not adopt phase information, the detection data coordinates figure that safe product light soy sauce king and dangerous material normal hexane, kerosene, gasoline mix.Fig. 3 adopts phase information, the detection data coordinates figure that safe light soy sauce king and dangerous material normal hexane, kerosene, gasoline separate.(wherein to Fig. 2, Fig. 3, transverse axis is amplitude, and the longitudinal axis is phase place)
Embodiment:
Embodiment: with reference to figure 1, Fig. 2, Fig. 3, a kind of dangerous liquid material adopts the method for microwave multifrequency point vector detection in detecting, it is characterized in that adopting how discrete frequency, across S, C, X many frequency ranges, get some frequencies in each frequency range, measure testing liquid to electromagnetic reflected signal, form the multi-point sampling to liquid dielectric spectrum, reflect that liquid is in the dielectric property of different frequency range, differentiates different liquids by the reflected signal measured; In certain frequency range, electromagnetic reflected signal is difficult to the liquid differentiated, chooses other frequency ranges and differentiate, make mutually to confirm between different frequency range, realize combining resolution to the multifrequency point of testing liquid.Measure the amplitude of testing liquid reflected signal and phase place two dimensions of information and Vector Message, differentiate different liquids by detected reflectance signal in the distribution of the two dimensional surface of amplitude and phase place.For implementing the configuration-system of the custom-designed emission of radio frequency signals module of said method and receiver module, it is characterized in that emission of radio frequency signals module and receiver module utilize 100MHz constant-temperature crystal oscillator as a reference, according to control protocol, system broad frequency synthesizer produces multiple discrete frequency signal and complete transmitting by braodband directional coupler finally by emissive source after power amplification; Transmit and carry out mixing with the signal by launching wideband frequency synthesizer and power divider launching in broadband mixer, the two frequency-splitting is 50MHz, obtains 50MHz intermediate frequency self-test signal; And reach same phase place through the reflected signal that sensor 1,2 receives through phase shifter adjustment, carry out mixing through switch orientations coupling mechanism group and wideband pre-amplifier and through another road signal of power divider receiving in broadband mixer again, obtain 50MHz received IF signal; The two-way intermediate-freuqncy signal obtained extracts its amplitude and phase characteristic by FPGA process, thus measures vector signal.
Claims (2)
1. a dangerous liquid material adopts the method for microwave multifrequency point vector detection in detecting, it is characterized in that adopting how discrete frequency, across S, C, X many frequency ranges, some frequencies are got in each frequency range, measure testing liquid to electromagnetic reflected signal, form the multi-point sampling to liquid dielectric spectrum, reflect that liquid is in the dielectric property of different frequency range, carrys out resolution fluid by the reflected signal measured; In certain frequency range, electromagnetic reflected signal is difficult to the liquid differentiated, chooses other frequency ranges and differentiate, make mutually to confirm between different frequency range, realize combining resolution to the multifrequency point of testing liquid; Be specially: emission of radio frequency signals module and receiver module utilize 100MHz constant-temperature crystal oscillator as a reference, according to control protocol, system broad frequency synthesizer produces multiple discrete frequency signal and complete transmitting by braodband directional coupler finally by emissive source after power amplification; Transmit and carry out mixing with the signal by launching wideband frequency synthesizer and power divider launching in broadband mixer, the two frequency-splitting is 50MHz, obtains 50MHz intermediate frequency self-test signal; And reach same phase place through the reflected signal that sensor 1,2 receives through phase shifter adjustment, carry out mixing through switch orientations coupling mechanism group and wideband pre-amplifier and through another road signal of power divider receiving in broadband mixer again, obtain 50MHz received IF signal; The two-way intermediate-freuqncy signal obtained extracts its amplitude and phase characteristic by FPGA process, thus measures vector signal.
2. a kind of dangerous liquid material adopts the method for microwave multifrequency point vector detection in detecting according to claim 1, it is characterized in that measuring the amplitude of testing liquid reflected signal and phase place two dimensions of information and Vector Message, differentiate different liquids by detected reflectance signal in the distribution of the two dimensional surface of amplitude and phase place.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104814736B (en) * | 2015-05-05 | 2017-07-18 | 南方医科大学 | The method for monitoring the equipment of tissue dielectric property in real time and obtaining tissue dielectric property parameter |
| CN108072872A (en) * | 2016-11-17 | 2018-05-25 | 富士通株式会社 | Information extracting device, article detection apparatus |
| CN108072909A (en) * | 2016-11-17 | 2018-05-25 | 富士通株式会社 | Article detection method, device and system |
| CN108169248B (en) * | 2016-12-07 | 2020-02-18 | 成都理工大学 | Self-adaptive S parameter matching method for detecting liquid dangerous goods |
| CN108333585B (en) * | 2018-01-31 | 2021-03-16 | 广东美的厨房电器制造有限公司 | Radio frequency detection device, detection method and microwave oven |
| CN109470720B (en) * | 2018-09-29 | 2023-09-22 | 深圳市重投华讯太赫兹科技有限公司 | Liquid identification method, vector extraction method, liquid identification device, and storage medium |
| CN109471182B (en) * | 2018-11-13 | 2019-12-03 | 曹笑涵 | A kind of dangerous liquid material detector based on microwave measurement dielectric constant |
| CN113376609B (en) * | 2021-06-18 | 2021-12-31 | 北京邮电大学 | Liquid identification method based on millimeter wave radar |
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| CN1482452A (en) * | 2003-06-13 | 2004-03-17 | 四川大学 | High sensitivity liquid dielectric constant measuring probe |
| CN1806158A (en) * | 2003-06-13 | 2006-07-19 | 株式会社荏原制作所 | Measuring apparatus |
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| CN1482452A (en) * | 2003-06-13 | 2004-03-17 | 四川大学 | High sensitivity liquid dielectric constant measuring probe |
| CN1806158A (en) * | 2003-06-13 | 2006-07-19 | 株式会社荏原制作所 | Measuring apparatus |
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