CN103630555A - Method for detecting liquid hazardous substances by adopting microwave multi-frequency-point vector detection - Google Patents
Method for detecting liquid hazardous substances by adopting microwave multi-frequency-point vector detection Download PDFInfo
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Abstract
The invention relates to a method for detecting liquid hazardous substances by adopting microwave multi-frequency-point vector detection and aims to solve the problems that an instrument often mis-reports hazardous substances according to multiple liquid measurement data which can either indicate safety substances or hazardous substances and the expansion of a sample set of a liquid safety detector is limited. The method is characterized by comprising the following steps: extracting a plurality of frequency points in a plurality of frequency bands S, C and X by adopting multiple discrete frequency points, and measuring a reflection signal of a liquid to be detected to an electromagnetic wave to implement multi-point sampling on a liquid dielectric spectrum; distinguishing different types of liquids through reflection of dielectric characteristics of the liquids in different frequency bands by adopting the measured reflection signal; and distinguishing the liquid which is difficult to distinguish according to the reflection signal to the electromagnetic wave in a certain frequency band by selecting other frequency bands to enable the frequency bands to verify with one another, and so as to achieve the multi-frequency-point combined distinguishing for the liquid to be detected. The method disclosed by the invention can be used for detecting the liquid hazardous substances, and the accuracy is obviously improved.
Description
Technical field: the present invention relates to dangerous liquid material detection method, is a kind of method of microwave multifrequency point vector detection that adopts during dangerous liquid material detects specifically.
Background technology: dangerous liquid material detector is that dangerous liquid material is detected in the safety check systems such as instrument ， civil aviaton, railway, urban track traffic of identification, all needs the liquid article that passenger is carried to detect under the state not breaking a seal.In existing multiple inspection method and equipment, microwave detection method is one of main method, and current conventional microwave detection method, multiplex single point is frequently or compared with narrow-band, measuring-signal is generally only measured its amplitude, under larger sample set, (be more than or equal to 40 kinds), be difficult to the Detection accuracy (being greater than 99% under appointment sample set) that reaches higher.In liquid safe detector of the same type, always exist plurality of liquid measurement data between safe product and dangerous material, be the main source that instrument wrong report produces, be 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 that proposes to adopt in dangerous liquid material detection microwave multifrequency point vector detection, with solution background technology, exist: plurality of liquid measurement data is between safe product and dangerous material, cause instrument wrong report, the sample set of confined liquid safety detector expansion simultaneously.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, many frequency ranges of X, in each frequency range, get some frequencies, measure testing liquid to electromagnetic reflected signal, the multi-point sampling of formation to liquid dielectric spectra, the dielectric property by the reflected signal reflection liquid measured at different frequency range, differentiates different liquids; Liquid in certain frequency range to electromagnetic reflected signal indistinguishable, chooses other frequency ranges and differentiates, and makes confirmation mutually between different frequency range, realizes the multifrequency point of testing liquid is combined to resolution.Wherein, amplitude and the phase place two dimensions of information of measuring testing liquid reflected signal are Vector Message, by detected reflectance signal, in the distribution of the two dimensional surface of amplitude and phase place, differentiate different liquids.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 a plurality of discrete frequency signals and by braodband directional coupler, finally by emissive source, complete transmitting after power amplification; Transmit and in transmitting broadband mixer, carry out mixing with the signal by transmitting wideband frequency synthesizer and power divider, the two frequency-splitting is 50MHz, obtains 50MHz intermediate frequency self-test signal; And the reflected signal receiving through sensor 1,2 is through phase shifter, adjusting reaches same phase place, another road signal through switch orientations coupling mechanism group and wideband pre-amplifier and process power divider carries out mixing in receiving broadband mixer again, obtains 50MHz received IF signal; The two-way intermediate-freuqncy signal obtaining is processed and is extracted its amplitude and phase characteristic by FPGA, thereby measures vector signal.
The beneficial effect that the present invention and background technology comparison have is: according to technique scheme, because the variation with frequency of the specific inductive capacity of liquid changes, the Changing Pattern between liquid not of the same race is also not quite similar, and there is no definite Changing Pattern.Thereby more approaching in a certain frequency range measurement data, the liquid that cannot differentiate, may be able to differentiate in another frequency range.Therefore the present invention adopts how discrete frequency, across a plurality of frequency ranges such as S, C, X, in each frequency range, get some frequencies, measure testing liquid to electromagnetic reflected signal, the multi-point sampling of formation to liquid dielectric spectra, dielectric property by the reflected signal reflection liquid measured at different frequency range, differentiates different liquids; Liquid in certain frequency range to electromagnetic reflected signal indistinguishable, chooses other frequency ranges and differentiates, and makes confirmation mutually between different frequency range, realizes the multifrequency point of testing liquid is combined to resolution.On the other hand, between different liquid because dielectric property is different, the amplitude of the reflected signal to be measured of measuring and phase place all can there are differences, therefore the present invention, by measuring amplitude and the phase place two dimensions of information (being 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 between safe product and dangerous material, causes instrument wrong report, has expanded the sample set of liquid safe detector simultaneously, significantly improves resolution accuracy rate.
Accompanying drawing explanation: 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, many frequency ranges of X, in each frequency range, get some frequencies, measure testing liquid to electromagnetic reflected signal, form the multi-point sampling to liquid dielectric spectra, dielectric property by the reflected signal reflection liquid measured at different frequency range, differentiates different liquids; Liquid in certain frequency range to electromagnetic reflected signal indistinguishable, chooses other frequency ranges and differentiates, and makes confirmation mutually between different frequency range, realizes the multifrequency point of testing liquid is combined to resolution.Amplitude and the phase place two dimensions of information of measuring testing liquid reflected signal are Vector Message, by detected reflectance signal, in the distribution of the two dimensional surface of amplitude and phase place, differentiate different liquids.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 a plurality of discrete frequency signals and by braodband directional coupler, finally by emissive source, complete transmitting after power amplification; Transmit and in transmitting broadband mixer, carry out mixing with the signal by transmitting wideband frequency synthesizer and power divider, the two frequency-splitting is 50MHz, obtains 50MHz intermediate frequency self-test signal; And the reflected signal receiving through sensor 1,2 is through phase shifter, adjusting reaches same phase place, another road signal through switch orientations coupling mechanism group and wideband pre-amplifier and process power divider carries out mixing in receiving broadband mixer again, obtains 50MHz received IF signal; The two-way intermediate-freuqncy signal obtaining is processed and is extracted its amplitude and phase characteristic by FPGA, thereby measures vector signal.
Claims (3)
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, many frequency ranges of X, in each frequency range, get some frequencies, measure testing liquid to electromagnetic reflected signal, the multi-point sampling of formation to liquid dielectric spectra, the dielectric property by the reflected signal reflection liquid measured at different frequency range, differentiates liquid; Liquid in certain frequency range to electromagnetic reflected signal indistinguishable, chooses other frequency ranges and differentiates, and makes confirmation mutually between different frequency range, realizes the multifrequency point of testing liquid is combined to resolution.
2. a kind of dangerous liquid material adopts the method for microwave multifrequency point vector detection in detecting according to claim 1, the amplitude and the phase place two dimensions of information that it is characterized in that measuring testing liquid reflected signal are Vector Message, by detected reflectance signal, in the distribution of the two dimensional surface of amplitude and phase place, differentiate different liquids.
3. for implementing the claims the configuration-system of 1 or 2 custom-designed emission of radio frequency signals modules 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 a plurality of discrete frequency signals and by braodband directional coupler, finally by emissive source, complete transmitting after power amplification; Transmit and in transmitting broadband mixer, carry out mixing with the signal by transmitting wideband frequency synthesizer and power divider, the two frequency-splitting is 50MHz, obtains 50MHz intermediate frequency self-test signal; And the reflected signal receiving through sensor 1,2 is through phase shifter, adjusting reaches same phase place, another road signal through switch orientations coupling mechanism group and wideband pre-amplifier and process power divider carries out mixing in receiving broadband mixer again, obtains 50MHz received IF signal; The two-way intermediate-freuqncy signal obtaining is processed and is extracted its amplitude and phase characteristic by FPGA, thereby measures vector signal.
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Cited By (8)
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| CN104814736A (en) * | 2015-05-05 | 2015-08-05 | 南方医科大学 | Body tissue dielectric property real-time monitoring device and method for obtaining body tissue dielectric property parameters |
| CN108072909A (en) * | 2016-11-17 | 2018-05-25 | 富士通株式会社 | Article detection method, device and system |
| CN108072872A (en) * | 2016-11-17 | 2018-05-25 | 富士通株式会社 | Information extracting device, article detection apparatus |
| CN108169248A (en) * | 2016-12-07 | 2018-06-15 | 成都理工大学 | A kind of adaptive S parameter matching process for liquid hazardous material detection |
| CN109470720A (en) * | 2018-09-29 | 2019-03-15 | 深圳市华讯方舟太赫兹科技有限公司 | Liquid identification method, vector extracting method, Liquid identification device and storage medium |
| CN109471182A (en) * | 2018-11-13 | 2019-03-15 | 曹笑涵 | A kind of dangerous liquid material detector based on microwave measurement dielectric constant |
| WO2019149251A1 (en) * | 2018-01-31 | 2019-08-08 | 广东美的厨房电器制造有限公司 | Radio frequency detection device and detection method, and microwave oven |
| CN113376609A (en) * | 2021-06-18 | 2021-09-10 | 北京邮电大学 | Liquid identification method based on millimeter wave radar |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104814736A (en) * | 2015-05-05 | 2015-08-05 | 南方医科大学 | Body tissue dielectric property real-time monitoring device and method for obtaining body tissue dielectric property parameters |
| CN108072909A (en) * | 2016-11-17 | 2018-05-25 | 富士通株式会社 | Article detection method, device and system |
| CN108072872A (en) * | 2016-11-17 | 2018-05-25 | 富士通株式会社 | Information extracting device, article detection apparatus |
| CN108169248A (en) * | 2016-12-07 | 2018-06-15 | 成都理工大学 | A kind of adaptive S parameter matching process for liquid hazardous material detection |
| 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 |
| WO2019149251A1 (en) * | 2018-01-31 | 2019-08-08 | 广东美的厨房电器制造有限公司 | Radio frequency detection device and detection method, and microwave oven |
| US11490470B2 (en) | 2018-01-31 | 2022-11-01 | Guangdong Midea Kitchen Appliances Manufacturing Co., Ltd. | Radio frequency detection device and detection method, and microwave oven |
| CN109470720A (en) * | 2018-09-29 | 2019-03-15 | 深圳市华讯方舟太赫兹科技有限公司 | Liquid identification method, vector extracting method, Liquid identification device and storage medium |
| 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 |
| CN109471182A (en) * | 2018-11-13 | 2019-03-15 | 曹笑涵 | A kind of dangerous liquid material detector based on microwave measurement dielectric constant |
| CN109471182B (en) * | 2018-11-13 | 2019-12-03 | 曹笑涵 | A kind of dangerous liquid material detector based on microwave measurement dielectric constant |
| CN113376609A (en) * | 2021-06-18 | 2021-09-10 | 北京邮电大学 | Liquid identification method based on millimeter wave radar |
| 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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