CN114216853B - Real-time detection system and method based on terahertz leaky-wave antenna - Google Patents
Real-time detection system and method based on terahertz leaky-wave antenna Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000011897 real-time detection Methods 0.000 title claims abstract description 17
- 239000013076 target substance Substances 0.000 claims abstract description 83
- 238000010521 absorption reaction Methods 0.000 claims abstract description 33
- 238000001228 spectrum Methods 0.000 claims abstract description 23
- 238000000354 decomposition reaction Methods 0.000 claims abstract description 14
- 238000009826 distribution Methods 0.000 claims abstract description 12
- 239000007788 liquid Substances 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 3
- 238000001514 detection method Methods 0.000 abstract description 47
- WEVYAHXRMPXWCK-UHFFFAOYSA-N Acetonitrile Chemical compound CC#N WEVYAHXRMPXWCK-UHFFFAOYSA-N 0.000 description 63
- 239000007789 gas Substances 0.000 description 40
- 238000010586 diagram Methods 0.000 description 14
- 238000004590 computer program Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 7
- 230000003595 spectral effect Effects 0.000 description 5
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- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- 238000004817 gas chromatography Methods 0.000 description 2
- 238000002329 infrared spectrum Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 230000001052 transient effect Effects 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 238000000862 absorption spectrum Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 238000012569 chemometric method Methods 0.000 description 1
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- 238000009792 diffusion process Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
- 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
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Abstract
The application provides a real-time detection system and method based on a terahertz leaky-wave antenna, and belongs to the technical field of detection. The system comprises: the control power distribution module is used for determining corresponding modulation signals according to the absorption characteristics of the target substance in the terahertz frequency band; the transmitting module is used for outputting terahertz waves of a target frequency band according to the modulation signals and feeding the terahertz waves into the leaky-wave antenna; the leaky-wave antenna is used for converting terahertz waves of a target frequency band into single-frequency terahertz signals with different angles and radiating the single-frequency terahertz signals into a free space; the reflection module is used for converging single-frequency terahertz signals at a plurality of different angles in the free space; the receiving module is used for receiving the converged terahertz waves and sending the converged terahertz waves to the signal processing module; the signal processing module is used for obtaining spectrum information according to the terahertz waves sent by the receiving module, inverting the terahertz waves based on the spectrum-space decomposition characteristics of the leaky-wave antenna, and determining the real-time relative position of the target substance to the leaky-wave antenna. The effect of the real-time property of the detection gas can be improved.
Description
Technical Field
The embodiment of the application relates to the technical field of detection, in particular to a real-time detection system and method based on a terahertz leaky-wave antenna.
Background
At present, methods commonly used for detecting gases include gas chromatography, infrared spectrum method and the like, and rotation absorption spectrum peaks of polar gas molecules in a terahertz frequency band (0.1 THz-10 THz) are obvious in characteristics, such as acetonitrile, carbon monoxide and the like, and absorption peaks of the polar gas molecules are specific, so that related gas detection can be realized by using a terahertz technology.
However, the conventional terahertz gas detection system can only realize detection of a single point in space, and the detection process generally depends on a mechanical delay line to generate a full-band frequency spectrum, so that the detection speed is difficult to meet the requirement of instantaneity, and effective detection of some transient signals cannot be performed.
Disclosure of Invention
The embodiment of the application provides a real-time detection system and method based on a terahertz leaky-wave antenna, aiming at improving the real-time property of detected gas.
In a first aspect, an embodiment of the present application provides a real-time detection system based on a terahertz leaky-wave antenna, where the system includes a control power distribution module, a transmitting module, a leaky-wave antenna, a reflecting module, a receiving module, and a signal processing module;
the control power distribution module is used for distributing power to the transmitting module, the receiving module and the signal processing module and generating a modulation signal corresponding to a target substance according to the absorption characteristic of the target substance in a terahertz frequency band;
the transmitting module is used for outputting terahertz waves of a target frequency band to be determined according to the modulation signals corresponding to the target substances and feeding the terahertz waves of the target frequency band into the leaky-wave antenna;
the leaky-wave antenna is used for converting the terahertz waves of the fed-in target frequency band into single-frequency terahertz signals with a plurality of different angles so as to radiate into a free space;
the reflection module is used for converging single-frequency terahertz signals with different angles in a free space so as to be received by the receiving module;
the receiving module is used for receiving the terahertz waves converged by the reflecting module and sending the terahertz waves to the signal processing module;
the signal processing module is used for obtaining spectrum information according to the terahertz waves sent by the receiving module, inverting the spectrum information based on the spectrum-space decomposition characteristics of the leaky-wave antenna, and determining the real-time relative position of the target substance to the leaky-wave antenna.
Optionally, the transmitting module feeds the leaky-wave antenna by means of space feeding or integrated feeding.
Optionally, the leaky-wave antenna comprises a terahertz parallel plate waveguide antenna or a metal corrugated leaky-wave antenna.
Optionally, the reflection module comprises an elliptic cylindrical reflector, the leaky-wave antenna is arranged on one focal point of the elliptic cylindrical reflector, and the receiving module is arranged on the other focal point of the elliptic cylindrical reflector.
Optionally, the control power distribution module further comprises a modulation signal generator, and the modulation signal generator is used for generating a gaussian modulation sine wave signal or a segmented sine frequency modulation signal corresponding to the target substance.
Optionally, the target substance detected by the system includes a gas, a solid or a liquid having an absorption characteristic in a terahertz frequency band.
In a second aspect, an embodiment of the present application provides a real-time detection method based on a terahertz leaky-wave antenna, which is applied to a real-time detection system based on a terahertz leaky-wave antenna, and the method includes:
generating a modulation signal corresponding to a target substance according to the absorption characteristic of the target substance in a terahertz frequency band;
outputting terahertz waves of a target frequency band according to the modulation signals corresponding to the target substances, feeding the terahertz waves of the target frequency band into a leaky-wave antenna, and converting the terahertz waves of the fed target frequency band into single-frequency terahertz signals of a plurality of different angles through the leaky-wave antenna so as to radiate into a free space;
and converging the single-frequency terahertz signals with different angles in the free space so as to receive the single-frequency terahertz signals, obtaining spectrum information according to the received terahertz waves, inverting the single-frequency terahertz signals based on the spectrum-space decomposition characteristics of the leaky-wave antenna, determining the real-time relative position of the target substance to the leaky-wave antenna, and estimating the motion trail of the target substance.
Optionally, generating a modulation signal corresponding to the target substance according to an absorption characteristic of the target substance in the terahertz frequency band includes:
and responding to the input operation aiming at the absorption characteristic of the target substance, generating a modulation signal corresponding to the target substance, and feeding the terahertz wave of the target frequency band into a leaky-wave antenna.
Optionally, generating a modulation signal corresponding to the target substance includes:
obtaining a pre-stored target lookup table, wherein the target lookup table comprises modulation signals corresponding to a plurality of sample substances;
and acquiring a modulation signal corresponding to the target substance from the target lookup table to generate a modulation signal corresponding to the target substance.
The beneficial effects are that:
according to the terahertz wave antenna, the absorption characteristics of the target substance in the terahertz frequency band are utilized to determine the modulation signals corresponding to the target substance, the terahertz waves of the target frequency band corresponding to the modulation signals corresponding to the target substance are fed into the leaky wave antenna through the transmitting module, and the leaky wave antenna can convert the terahertz waves of the target frequency band into single-frequency terahertz signals with different angles so as to radiate into a free space; and then converging single-frequency terahertz signals at a plurality of angles in a free space through a reflection module, receiving the single-frequency terahertz signals by a receiving module, sending the single-frequency terahertz signals to a signal processing module for processing, obtaining spectrum information by the signal processing module according to the terahertz waves sent by the receiving module, inverting the single-frequency terahertz signals based on the spectrum-space decomposition characteristics of the leaky-wave antenna, absorbing the terahertz waves by the target substances if the target substances exist, and reflecting the real-time relative position of the target substances to the leaky-wave antenna in the current detection range according to the inversion.
According to the terahertz wave detection method and device, the absorption characteristics of the target substance in the terahertz frequency band are utilized, the terahertz wave of the target frequency band is generated to detect the target substance, and compared with the traditional terahertz gas detection system which relies on a mechanical delay line to generate a detection mode of full-frequency-band frequency spectrum, the detection speed is faster, and the detection instantaneity can be improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the description of the embodiments of the present application will be briefly described below. It is apparent that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art.
FIG. 1 is a functional block diagram of a real-time detection system according to one embodiment of the present application;
FIG. 2 is a schematic diagram of a real-time detection system according to one embodiment of the present application;
FIG. 3 is a Gaussian modulated sine wave signal corresponding to acetonitrile gas according to one embodiment of the present application;
FIG. 4 is a graphical representation of real-time spectral information in the absence of acetonitrile gas within a detection range as set forth in one embodiment of the present application;
FIG. 5 is a graph showing real-time spectral information for the presence of acetonitrile gas within a detection range according to one embodiment of the present application;
fig. 6 is a schematic diagram showing movement of acetonitrile gas within the detection range of the system according to one embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It will be apparent that the embodiments described are some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
Common gas detection methods comprise gas chromatography, infrared spectrum method and the like, and absorption peaks of polar gas in a terahertz frequency band (0.1 THz-10 THz) are characterized by specificity and repeatability, so that a unique fingerprint spectrum peak is provided for gas detection, and related gas detection can be realized by using a terahertz technology.
Compared with the chemometric methods such as gas chromatograph, the terahertz gas detection method has the advantages of rapid detection and simple structure, compared with the infrared technology, the terahertz has the advantages that the absorption peak of the terahertz on the macromolecular gas is usually sharper, the linear overlapping is less, and the recognition precision is high.
However, the conventional terahertz gas detection system generally depends on a mechanical delay line to generate a full-band spectrum, so that the detection speed still cannot meet the requirement of real-time performance, and cannot effectively detect some transient signals.
Therefore, in order to improve the real-time performance of detection and increase the detection range, the application provides a real-time detection system based on a terahertz leaky-wave antenna.
Referring to fig. 1, a functional block diagram of a real-time detection system based on a terahertz leaky-wave antenna in an embodiment of the invention is shown, referring to fig. 2, a schematic diagram of a system in an embodiment of the invention is shown, as in fig. 1 and 2, the system includes a control power distribution module 100, a transmitting module 200, a leaky-wave antenna 300, a reflecting module 400, a receiving module 500, and a signal processing module 600;
the control power distribution module 100 is configured to distribute power to the transmitting module 200, the receiving module 500, and the signal processing module 600, and further configured to generate a modulation signal corresponding to a target substance according to an absorption characteristic of the target substance in a terahertz frequency band.
Specifically, the target substance may include a gas, a solid or a liquid having an absorption characteristic in the terahertz frequency band, and different target substances have unique fingerprint peaks, so that the corresponding modulation signal can be determined according to the absorption characteristic of the target substance in the terahertz frequency band. The control power distribution module 100 further includes a modulation signal generator for generating a gaussian modulated sine wave signal or a segmented sinusoidal frequency modulation signal corresponding to the target substance.
Taking acetonitrile gas as an example, because the molecular configuration symmetry of the acetonitrile gas is good, the absorption characteristics of the acetonitrile gas in a terahertz frequency band are periodically distributed in a frequency band with a narrower bandwidth, and the terahertz wave frequency band with most frequencies is not in absorption response, the acetonitrile gas only has stronger absorption bands at about 312GHz,331GHz,349GHz and 367GHz frequencies, and further Gaussian modulation sine wave signals with four frequencies of 312GHz,331GHz,349GHz and 367GHz can be used as modulation signals, so that the acetonitrile gas position can be conveniently detected by utilizing the absorption characteristics of the acetonitrile gas.
The transmitting module 200 is configured to output a terahertz wave of a target frequency band to be determined according to a modulation signal corresponding to the target substance, and feed the terahertz wave of the target frequency band to the leaky-wave antenna 300.
After determining the corresponding modulation signal according to the target substance, the control power distribution module 100 controls the transmitting module 200 to output the terahertz wave of the target frequency band corresponding to the modulation signal, and the transmitting module 200 feeds the terahertz wave of the target frequency band into the leaky-wave antenna 300 connected with the terahertz wave so that the leaky-wave antenna 300 radiates. The transmitting module 200 feeds the terahertz wave of the target frequency band to the leaky-wave antenna 300 through space feeding or integrated feeding, and in other embodiments, the transmitting module 200 may feed the terahertz wave of the target frequency band to the leaky-wave antenna 300 through other manners.
The leaky-wave antenna 300 is configured to convert a terahertz wave of a target frequency band that is fed into a plurality of single-frequency terahertz signals with different angles, so as to radiate into free space.
The leaky-wave antenna 300 is a traveling wave antenna, belongs to a frequency scanning antenna, has the advantages of low cost, low profile and high gain, and the characteristic that the radiation direction of the antenna scans along with the frequency, and radiates the energy of terahertz waves to different angles of space according to the dispersion characteristic according to the different frequencies of input signals, so that the purpose of spectrum-space decomposition is achieved, and the frequency scanning characteristic of the leaky-wave antenna 300 has larger application potential due to the acquisition requirement of spectrum information in a broadband under the terahertz gas detection background.
By utilizing the spectrum-space decomposition characteristic of the leaky-wave antenna 300, the terahertz waves of the fed target frequency band can be emitted to different angles in space by taking the leaky-wave antenna 300 as the center of a circle, and the input terahertz waves of the target frequency band can be converted into single-frequency terahertz signals with a plurality of different angles in real time based on the leaky-wave antenna 300 because no additional mechanical rotation device is needed.
In this embodiment, the leaky-wave antenna 300 includes a terahertz parallel plate waveguide antenna or a metal corrugated leaky-wave antenna 300.
The reflection module 400 is configured to aggregate single-frequency terahertz signals with different angles in the free space, so that the receiving module 500 receives the single-frequency terahertz signals.
Specifically, the reflection module 400 includes an elliptical cylindrical mirror, the leaky-wave antenna 300 is disposed at one focal point of the elliptical cylindrical mirror, and the reception module 500 is disposed at the other focal point of the elliptical cylindrical mirror.
Since a large number of receiving ends are required to directly receive signals at different angles in space, the complexity and cost are high, and the optical properties of ellipses are utilized in the embodiment: terahertz waves emitted from one focus are automatically converged at the other focus through the elliptical cylindrical reflector.
Therefore, the reflection module 400 is set as an elliptic cylindrical reflector, the leaky-wave antenna 300 is set at one focal point of the elliptic cylindrical reflector, and the receiving module 500 is set at the other focal point of the elliptic cylindrical reflector, so that terahertz waves with different angles and different frequencies emitted by the leaky-wave antenna 300 can be received by a single and fixed receiving end, thereby reducing the system cost and ensuring the stability of the whole system.
The receiving module 500 is configured to receive the terahertz waves converged by the reflecting module 400 and send the terahertz waves to the signal processing module 600.
Since the reflection module 400 can collect the single-frequency terahertz signals with different angles in the free space, only one receiving module 500 is needed to be arranged in the embodiment, and one receiving antenna can be arranged to receive the single-frequency terahertz signals.
The signal processing module 600 is configured to obtain spectral information according to the terahertz wave sent by the receiving module 500, perform inversion based on the spectrum-space decomposition characteristic of the leaky-wave antenna 300, and determine a real-time relative position of the target substance with respect to the leaky-wave antenna 300.
The signal processing module 600 obtains spectral information according to the terahertz wave sent by the receiving module 500, performs inversion based on the spectrum-space decomposition characteristic of the leaky-wave antenna 300, and if a target substance exists, absorbs the terahertz wave, so that the real-time relative position of the target substance to the leaky-wave antenna 300 in the current detection range can be represented from the spectral information according to inversion.
In a possible implementation, taking acetonitrile gas as an example, the detection process of the system is described:
referring to fig. 3, a gaussian modulated sine wave signal corresponding to acetonitrile gas is shown, as in fig. 3, according to the fact that the acetonitrile gas has strong absorption characteristics only at frequencies of 312ghz,331ghz,349ghz and 367ghz, the power distribution module 100 is controlled to take the gaussian modulated sine wave signal of four frequencies of 312ghz,331ghz,349ghz and 367ghz as a modulation signal, and the sending module feeds the leaky-wave antenna 300 with terahertz waves of a target frequency band corresponding to the modulation signal.
In the embodiment, the terahertz parallel plate waveguide leaky-wave antenna is adopted, and has the advantages of simple structure and spectrum-space decomposition characteristics:
f＝c 0 /(2bsinθ)
wherein f is the frequency of terahertz wave of the target frequency band, c 0 Let b be the plate spacing of the terahertz parallel plates, θ be the angle of the terahertz parallel plate waveguide leaky-wave antenna radiating into free space.
The frequency of terahertz waves of the known target frequency band is 312GHz,331GHz,349GHz and 367GHz respectively, and the light speed c 0 As known, the plate interval b in this embodiment is 0.5mm, so that the radiation angle of each single-frequency terahertz signal radiated by the terahertz parallel plate waveguide leaky-wave antenna can be calculated to be 74 °,65 °,59 °,55 °, respectively°。
The single-frequency terahertz signals of a plurality of angles radiated by the terahertz parallel plate waveguide leaky-wave antenna are reflected by the elliptic cylindrical reflector and then received by the receiving module 500 at the other focal point, the receiving module 500 sends terahertz waves converged by the elliptic cylindrical reflector to the signal processing module 600, and the signal processing module 600 obtains spectrum information according to the terahertz waves sent by the receiving module 500.
Referring to fig. 4, a diagram of real-time spectrum information when acetonitrile gas is not present in the detection range is shown, and fig. 5, a diagram of real-time spectrum information when acetonitrile gas is present in the detection range is shown. Fig. 6 shows a schematic diagram of movement of acetonitrile gas within the detection range of the system.
As shown in fig. 4, if no acetonitrile gas is present in the detection range, the real-time spectrum information of each terahertz signal is complete, i.e., the spectrum information of the terahertz signal of one frequency is a white line in fig. 4.
As shown in fig. 5, the real-time spectrum information of the terahertz wave with the frequency of 312GHz obtained by the signal processing end is obviously reduced at time t1, that is, at time t1, the terahertz wave with the direction of 74 ° at 312GHz is absorbed due to the strong absorption characteristic of acetonitrile, and the portion of the white line defect corresponding to the terahertz wave with the frequency of 312GHz in fig. 5 represents that the terahertz wave with the frequency is absorbed by acetonitrile, so that according to the inversion of the spectrum-space decomposition characteristic of the leaky-wave antenna, the current acetonitrile gas position is located at the 74 ° direction of the leaky-wave antenna.
And similarly, the gas position detection at the time t2-t4 can be completed, and the gas diffusion trend can be further estimated according to the position information and the time interval obtained by inversion.
According to the terahertz wave detection method and device, the absorption characteristics of the target substance in the terahertz frequency band are utilized, the terahertz wave of the target frequency band is generated to detect the target substance, and compared with a detection mode that a traditional terahertz gas detection system relies on a mechanical delay line to generate a full-frequency-band frequency spectrum, the terahertz wave detection method and device are faster in detection speed, and the real-time performance in detection can be improved; and set up the reflection module 400, can assemble the single frequency terahertz signal of a plurality of different angles in the free space, receive through single and fixed receiving terminal to reduce system cost, guarantee the stability of whole system, therefore this system has improved the real-time in the testing process through simple device.
The embodiment of the application also provides a real-time detection method based on the terahertz leaky-wave antenna, which is applied to a real-time detection system based on the terahertz leaky-wave antenna, and comprises the following steps:
s101: generating a modulation signal corresponding to a target substance according to the absorption characteristic of the target substance in a terahertz frequency band;
s102: outputting terahertz waves of a target frequency band according to the modulation signals corresponding to the target substances, feeding the terahertz waves of the target frequency band into a leaky-wave antenna, and converting the terahertz waves of the fed target frequency band into single-frequency terahertz signals of a plurality of different angles through the leaky-wave antenna so as to radiate into a free space;
s103: converging single-frequency terahertz signals with different angles in a free space for receiving;
s104: and obtaining spectrum information according to the received terahertz waves, inverting based on the spectrum-space decomposition characteristics of the leaky-wave antenna, determining the real-time relative position of the target substance to the leaky-wave antenna, and estimating the motion trail of the target substance.
According to the terahertz wave generation method, the modulating signals corresponding to the target substances are generated according to the absorption characteristics of the target substances in the terahertz frequency band, terahertz waves of the target frequency band are output according to the modulating signals corresponding to the target substances, and the terahertz waves of the target frequency band are converted into single-frequency terahertz signals of a plurality of different angles through the leaky-wave antenna so as to radiate into free space.
And then converging single-frequency terahertz signals with different angles in a free space so as to be convenient for the receiving module to receive, obtaining spectrum information according to the terahertz waves sent by the receiving module, inverting based on the spectrum-space decomposition characteristics of the leaky-wave antenna, determining the real-time relative position of the target substance to the leaky-wave antenna, and estimating the motion trail of the target substance.
According to the terahertz wave detection method and device, the absorption characteristics of the target substance in the terahertz frequency band are utilized, the terahertz wave of the target frequency band is generated to detect the target substance, and compared with the traditional terahertz gas detection system which relies on a mechanical delay line to generate a detection mode of full-frequency-band frequency spectrum, the terahertz wave detection method and device are faster in detection speed and capable of improving real-time performance in detection.
Optionally, generating a modulation signal corresponding to the target substance according to an absorption characteristic of the target substance in the terahertz frequency band includes:
and responding to the input operation aiming at the absorption characteristic of the target substance, generating a modulation signal corresponding to the target substance, and feeding the terahertz wave of the target frequency band into a leaky-wave antenna.
The user can input the absorption characteristics of the target substance to be detected, and in response to the input operation, can determine the modulation signal of the target substance corresponding to the input operation.
Optionally, generating a modulation signal corresponding to the target substance includes:
obtaining a pre-stored target lookup table, wherein the target lookup table comprises modulation signals corresponding to a plurality of sample substances;
and acquiring a modulation signal corresponding to the target substance from the target lookup table to generate a modulation signal corresponding to the target substance.
A target lookup table may be preset, the modulation signals corresponding to the plurality of samples may be stored, and after the input operation for the absorption characteristics of the target substance is responded, the modulation signals corresponding to the target substance may be obtained from the target lookup table, so that the modulation signals corresponding to the target substance may be generated.
In this specification, each embodiment is described in a progressive manner, and each embodiment is mainly described by differences from other embodiments, and identical and similar parts between the embodiments are all enough to be referred to each other.
It will be apparent to those skilled in the art that embodiments of the present application may be provided as a method, apparatus, or computer program product. Accordingly, the present embodiments may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, embodiments of the present application may take the form of a computer program product on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.
Embodiments of the present application are described with reference to flowchart illustrations and/or block diagrams of methods, terminal devices (apparatus), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing terminal device to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing terminal device, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present embodiments have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the embodiments of the present application.
Finally, it is further noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article or terminal device comprising the element.
The principles and embodiments of the present application are described herein with specific examples, the above examples being provided only to assist in understanding the methods of the present application and their core ideas; meanwhile, as those skilled in the art will have modifications in the specific embodiments and application scope in accordance with the ideas of the present application, the present description should not be construed as limiting the present application in view of the above.
Claims (9)
1. The real-time detection system based on the terahertz leaky-wave antenna is characterized by comprising a control power distribution module, a transmitting module, a leaky-wave antenna, a reflecting module, a receiving module and a signal processing module;
the control power distribution module is used for distributing power to the transmitting module, the receiving module and the signal processing module and generating a modulation signal corresponding to a target substance according to the absorption characteristic of the target substance in a terahertz frequency band;
the transmitting module is used for outputting terahertz waves of a target frequency band to be determined according to the modulation signals corresponding to the target substances and feeding the terahertz waves of the target frequency band into the leaky-wave antenna;
the leaky-wave antenna is used for converting the terahertz waves of the fed-in target frequency band into single-frequency terahertz signals with a plurality of different angles so as to radiate into a free space;
the reflection module is used for converging single-frequency terahertz signals with different angles in a free space so as to be received by the receiving module;
the receiving module is used for receiving the terahertz waves converged by the reflecting module and sending the terahertz waves to the signal processing module;
the signal processing module is used for obtaining spectrum information according to the terahertz waves sent by the receiving module, inverting the spectrum information based on the spectrum-space decomposition characteristics of the leaky-wave antenna, and determining the real-time relative position of the target substance to the leaky-wave antenna.
2. The system of claim 1, wherein the transmitting module feeds the leaky wave antenna by way of a spatial feed or an integrated feed.
3. The system of claim 1, wherein the leaky-wave antenna comprises a terahertz parallel plate waveguide antenna or a metal corrugated leaky-wave antenna.
4. The system of claim 1, wherein the reflection module comprises an elliptical cylindrical mirror, the leaky wave antenna being disposed at one focal point of the elliptical cylindrical mirror, the receiving module being disposed at another focal point of the elliptical cylindrical mirror.
5. The system of claim 1, wherein the control power distribution module further comprises a modulation signal generator for generating a gaussian modulated sine wave signal or a segmented sinusoidal frequency modulated signal corresponding to the target substance.
6. The system of any of claims 1-5, wherein the target substance detected by the system comprises a gas, a solid, or a liquid having an absorption characteristic in the terahertz frequency band.
7. A real-time detection method based on a terahertz leaky-wave antenna, which is characterized by being applied to the real-time detection system based on a terahertz leaky-wave antenna as claimed in any one of claims 1-6, the method comprising:
generating a modulation signal corresponding to a target substance according to the absorption characteristic of the target substance in a terahertz frequency band;
outputting terahertz waves of a target frequency band according to the modulation signals corresponding to the target substances, feeding the terahertz waves of the target frequency band into a leaky-wave antenna, and converting the terahertz waves of the fed target frequency band into single-frequency terahertz signals of a plurality of different angles through the leaky-wave antenna so as to radiate into a free space;
and converging the single-frequency terahertz signals with different angles in the free space so as to receive the single-frequency terahertz signals, obtaining spectrum information according to the received terahertz waves, inverting the single-frequency terahertz signals based on the spectrum-space decomposition characteristics of the leaky-wave antenna, determining the real-time relative position of the target substance to the leaky-wave antenna, and estimating the motion trail of the target substance.
8. The method of claim 7, wherein generating the modulation signal corresponding to the target substance based on the absorption characteristics of the target substance in the terahertz frequency band comprises:
and responding to the input operation aiming at the absorption characteristic of the target substance, generating a modulation signal corresponding to the target substance, and feeding the terahertz wave of the target frequency band into a leaky-wave antenna.
9. The method of claim 8, wherein generating a modulated signal corresponding to the target substance comprises:
obtaining a pre-stored target lookup table, wherein the target lookup table comprises modulation signals corresponding to a plurality of sample substances;
and acquiring a modulation signal corresponding to the target substance from the target lookup table to generate a modulation signal corresponding to the target substance.
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