CN114216853A - 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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- 238000010521 absorption reaction Methods 0.000 claims abstract description 33
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- 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
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- 239000007789 gas Substances 0.000 claims 1
- 238000001514 detection method Methods 0.000 abstract description 40
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- WEVYAHXRMPXWCK-UHFFFAOYSA-N Acetonitrile Chemical compound CC#N WEVYAHXRMPXWCK-UHFFFAOYSA-N 0.000 description 63
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
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- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
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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 a corresponding modulation signal according to the absorption characteristic 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 signal 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 at a plurality of different angles and radiating the single-frequency terahertz signals to a free space; the reflection module is used for converging single-frequency terahertz signals at a plurality of different angles in a free space; the receiving module is used for receiving the converged terahertz waves 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, carrying out inversion based on the spectrum-space decomposition characteristic of the leaky wave antenna and determining the real-time relative position of the target substance to the leaky wave antenna. The application can improve the real-time effect of the detection gas.
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, gas chromatography, infrared spectroscopy and the like are commonly used as methods for detecting gas, and the rotation absorption spectrum peak characteristics of polar gas molecules in a terahertz frequency band (0.1THz-10THz) are obvious, such as acetonitrile, carbon monoxide and the like, and the absorption peaks are expressed as specificity, so that related gas detection can be realized by utilizing 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 real-time performance, and some transient signals cannot be effectively detected.
Disclosure of Invention
The embodiment of the application provides a real-time detection system and method based on a terahertz leaky-wave antenna, and aims to improve the real-time performance of gas detection.
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 is also used for generating a modulation signal corresponding to a target substance according to the absorption characteristic of the target substance in the terahertz frequency band;
the transmitting module is used for outputting terahertz waves of a to-be-determined target frequency band according to the modulation signal corresponding to the target substance and feeding the terahertz waves of the target frequency band into the leaky-wave antenna;
the leaky-wave antenna is used for converting fed-in terahertz waves of a target frequency band into single-frequency terahertz signals at different angles so as to radiate the single-frequency terahertz signals to a free space;
the reflection module is used for converging single-frequency terahertz signals at a plurality of different angles in a free space so as to facilitate the receiving module to receive the signals;
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 spectral information according to the terahertz waves sent by the receiving module, performing inversion based on the frequency spectrum-space decomposition characteristic 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 spatial 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 includes an elliptic cylindrical mirror, the leaky-wave antenna is disposed at one focal point of the elliptic cylindrical mirror, and the reception module is disposed at another focal point of the elliptic cylindrical mirror.
Optionally, the control power distribution module further includes a modulation signal generator, and the modulation signal generator is configured to generate 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 comprises a gas, a solid or a liquid having an absorption characteristic in the 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 signal corresponding to the target substance, feeding the terahertz waves of the target frequency band into a leaky-wave antenna, and converting the fed terahertz waves of the target frequency band into single-frequency terahertz signals at a plurality of different angles through the leaky-wave antenna so as to radiate the single-frequency terahertz signals to a free space;
the method comprises the steps of converging single-frequency terahertz signals at different angles in a free space so as to be received, obtaining spectral information according to the received terahertz waves, carrying out inversion based on the frequency spectrum-space decomposition characteristic of a leaky-wave antenna, determining the real-time relative position of a 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 characteristics of the target substance, generating a modulation signal corresponding to the target substance, and feeding the terahertz wave of the target frequency band into the leaky wave antenna.
Optionally, generating a modulation 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.
Has the advantages that:
according to the terahertz signal radiation method, the modulation signal corresponding to the target substance is determined by utilizing the absorption characteristic of the target substance in the terahertz frequency band, the terahertz wave of the target frequency band corresponding to the modulation signal corresponding to the target substance is fed into the leaky-wave antenna through the transmitting module, and the leaky-wave antenna can convert the terahertz wave of the target frequency band into single-frequency terahertz signals at a plurality of different angles so as to radiate the single-frequency terahertz signals to a free space; then single-frequency terahertz signals at multiple angles in a free space are converged through the reflection module, the single-frequency terahertz signals are received by the receiving module and then sent to the signal processing module to be processed, the signal processing module obtains spectrum information according to the terahertz waves sent by the receiving module, inversion is carried out based on the frequency spectrum-space decomposition characteristic of the leaky-wave antenna, if a target substance exists, the target substance can absorb the terahertz waves, and then the real-time relative position of the target substance in the current detection range to the leaky-wave antenna can be reflected from the spectrum information according to the inversion.
This application utilizes the absorption characteristic of target material at terahertz frequency channel, and the terahertz wave that generates the target frequency channel detects the target material, and gas detecting system relies on the mechanical delay line to compare with the detection mode of generating full frequency channel frequency spectrum now with traditional terahertz, and it is faster to detect speed, can improve and detect the real-time.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings used in the description of the embodiments of the present application will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the application, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
FIG. 1 is a functional block diagram of a real-time detection system according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a real-time detection system according to an 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 graph of real-time spectral information in the absence of acetonitrile gas within the detection range as set forth in one embodiment of the present application;
FIG. 5 is a representation of real-time spectral information in the presence of acetonitrile gas within the detection range as set forth in one embodiment of the present application;
FIG. 6 is a schematic diagram of the 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 is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Common gas detection methods comprise gas chromatography, infrared spectroscopy and the like, and the absorption peak of polar gas in a terahertz frequency band (0.1THz-10THz) has the characteristics of specificity and repeatability, so that a unique fingerprint spectrum peak is provided for gas detection, and related gas detection can be realized by utilizing a terahertz technology.
Compared with a gas chromatograph and other chemical metering methods, the terahertz gas detection method has the advantages of being fast in detection and simple in structure, and compared with an infrared technology, terahertz gas is usually sharper in absorption peak obtained by macromolecular gas, line type overlapping is less, and identification precision is high.
However, the conventional terahertz gas detection system generally relies on a mechanical delay line to generate a full-band spectrum, so that the detection speed still cannot meet the real-time requirement, 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 present invention is shown, and referring to fig. 2, a schematic structural diagram of a system in an embodiment of the present invention is shown, such as fig. 1 and fig. 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 is 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 a corresponding modulation signal may 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, and the modulation signal generator is configured to generate a gaussian modulation sine wave signal or a segmented sine frequency modulation signal corresponding to the target substance.
Taking acetonitrile gas as an example, because the molecular configuration symmetry of acetonitrile gas is good, the absorption characteristics of the acetonitrile gas in the terahertz frequency band are periodically distributed in a frequency band with a narrow bandwidth, and the terahertz frequency band with most frequencies has no absorption response, the acetonitrile gas has a strong absorption band only around the frequencies of 312GHz, 331GHz, 349GHz and 367GHz, 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 position of the acetonitrile gas can be conveniently detected by using the absorption characteristics of the acetonitrile gas.
The transmitting module 200 is configured to output a terahertz wave of an undetermined target frequency band according to the modulation signal corresponding to the target substance, and feed the terahertz wave of the target frequency band into the leaky-wave antenna 300.
After the corresponding modulation signal is determined according to the target substance, the power distribution module 100 is controlled to control the transmission module 200 to output the terahertz wave of the target frequency band corresponding to the modulation signal, and the transmission 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. In other embodiments, the transmitting module 200 may also feed the terahertz wave of the target frequency band into the leaky-wave antenna 300 in other manners.
The leaky-wave antenna 300 is configured to convert a fed terahertz wave of a target frequency band into a plurality of single-frequency terahertz signals at different angles, so as to radiate the terahertz signals to a free space.
The leaky-wave antenna 300 is a traveling-wave antenna, belongs to a frequency scanning antenna, and 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, according to the difference of the frequency of input signals, the energy of terahertz waves can be radiated to different angles of space according to the dispersion characteristic, so that the purpose of spectrum-space decomposition is achieved, and under the background of terahertz gas detection, the frequency scanning characteristic of the leaky-wave antenna 300 has great application potential due to the requirement on obtaining frequency spectrum information in a broadband.
By utilizing the frequency spectrum-space decomposition characteristic of the leaky-wave antenna 300, the fed-in terahertz waves of the target frequency band can be emitted to different angles of the space by taking the leaky-wave antenna 300 as the center of a circle, and because no additional mechanical rotating device is needed, the input terahertz waves of the target frequency band can be converted into single-frequency terahertz signals of a plurality of different angles in real time based on the leaky-wave antenna 300.
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 converge single-frequency terahertz signals at a plurality of different angles in a free space, so that the receiving module 500 receives the signals.
Specifically, the reflection module 400 includes an elliptic cylindrical mirror, the leaky wave antenna 300 is disposed at one focus of the elliptic cylindrical mirror, and the reception module 500 is disposed at the other focus of the elliptic cylindrical mirror.
Because a large number of receiving ends are needed for directly receiving signals at different angles in space, the complexity and the cost are high, and the optical property of an ellipse is utilized in the embodiment: the terahertz wave emitted from one focus can be automatically converged at the other focus through the elliptic cylindrical reflector.
Therefore, the reflection module 400 is set as an elliptical cylindrical reflector, the leaky-wave antenna 300 is set at one focus of the elliptical cylindrical reflector, and the receiving module 500 is set at the other focus of the elliptical 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 collected by the reflecting module 400, and send the terahertz waves to the signal processing module 600.
Since the reflection module 400 can converge the single-frequency terahertz signals at a plurality of different angles in the free space, only one receiving module 500 needs to be arranged in this embodiment, that is, one receiving antenna can be arranged to receive a plurality of 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 to the leaky-wave antenna 300.
The signal processing module 600 obtains spectral information according to the terahertz waves 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, the target substance absorbs the terahertz waves, so that the real-time relative position of the target substance in the current detection range to the leaky wave antenna 300 can be reflected from the spectral information according to the inversion.
In a possible embodiment, taking acetonitrile gas as an example, the detection process of the system is described as follows:
referring to fig. 3, a gaussian modulated sine wave signal corresponding to acetonitrile gas is shown, and as shown in fig. 3, according to that acetonitrile gas has a strong absorption characteristic only at frequencies of 312GHz, 331GHz, 349GHz, and 367GHz, the power distribution module 100 is further controlled to use the gaussian modulated sine wave signals at the four frequencies of 312GHz, 331GHz, 349GHz, and 367GHz as modulation signals, and the transmission module feeds the leaky wave antenna 300 with terahertz waves in a target frequency band corresponding to the modulation signals.
In the embodiment, the terahertz parallel plate waveguide leaky-wave antenna is adopted, the structure of the terahertz parallel plate waveguide leaky-wave antenna is simple, and the frequency spectrum-space decomposition characteristic is as follows:
f＝c0/(2bsinθ)
whereinF is the frequency of the terahertz wave of the target frequency band, c0The optical speed is b, the plate distance of the terahertz parallel plate is b, and theta is the angle of radiation of the terahertz parallel plate waveguide leaky-wave antenna to the free space.
The frequency correspondence of the terahertz waves of the target frequency band is respectively 312GHz, 331GHz, 349GHz, 367GHz and the light speed c0As is known, in the present embodiment, the plate pitch b is 0.5mm, so that the radiation angles of the single-frequency terahertz signals radiated by the terahertz parallel plate waveguide leaky-wave antenna can be calculated to be 74 °, 65 °, 59 °, and 55 °.
The single-frequency terahertz signals with multiple 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 focus, the terahertz waves converged by the elliptic cylindrical reflector are sent to the signal processing module 600 by the receiving module 500, and the signal processing module 600 obtains spectrum information according to the terahertz waves sent by the receiving module 500.
Fig. 4 shows a schematic diagram of the real-time spectral information when no acetonitrile gas is present in the detection range, and fig. 5 shows a schematic diagram of the real-time spectral information when acetonitrile gas is present in the detection range. Fig. 6 shows a schematic diagram of the 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 spectral information of each terahertz signal is complete, that is, the spectral information of a terahertz signal of one frequency is a white line in fig. 4.
As shown in fig. 5, the real-time spectral information of the terahertz wave with the frequency of 312GHz is significantly 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 white line defect portion 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 the inversion of the spectrum-space decomposition characteristic of the leaky-wave antenna shows that the acetonitrile gas position is located at 74 ° of the leaky-wave antenna at present.
Similarly, the gas position detection at the time of t2-t4 can be completed, and the diffusion trend of the gas can be further estimated according to the position information and the time interval obtained by inversion.
According to the method, the target substance is detected by generating the terahertz wave of the target frequency band by utilizing the absorption characteristic of the target substance in the terahertz frequency band, 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 detection speed is higher, and the real-time performance during detection can be improved; and set up 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 guarantees the stability of whole system, therefore this system has improved the real-time of testing in-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 the method 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 signal corresponding to the target substance, feeding the terahertz waves of the target frequency band into a leaky-wave antenna, and converting the fed terahertz waves of the target frequency band into single-frequency terahertz signals at a plurality of different angles through the leaky-wave antenna so as to radiate the single-frequency terahertz signals to a free space;
s103: converging single-frequency terahertz signals at different angles in a free space to receive the signals;
s104: obtaining spectral information according to the received terahertz waves, performing inversion based on the spectrum-space decomposition characteristic of the leaky wave antenna, determining the real-time relative position of the target substance to the leaky wave antenna, and estimating the motion track of the target substance.
According to the terahertz signal conversion device, the modulation signal corresponding to the target substance is generated according to the absorption characteristic of the target substance in the terahertz frequency band, the terahertz wave of the target frequency band is output according to the modulation signal corresponding to the target substance, the terahertz wave of the target frequency band passes through the leaky-wave antenna, and the terahertz wave of the target frequency band is converted into single-frequency terahertz signals at a plurality of different angles so as to radiate to a free space.
And then converging single-frequency terahertz signals at a plurality of different angles in a free space so as to be received by the receiving module, obtaining spectral information according to the terahertz waves sent by the receiving module, performing inversion based on the frequency spectrum-space decomposition characteristic 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 system, the target substance is detected by utilizing the absorption characteristic of the target substance in the terahertz frequency band, 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 detection speed is higher, and the real-time performance during detection can be improved.
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 characteristics of the target substance, generating a modulation signal corresponding to the target substance, and feeding the terahertz wave of the target frequency band into the leaky wave antenna.
The user can input the absorption characteristics of the target substance to be detected, and further, in response to the input operation, the modulation signal of the target substance corresponding to the input operation can be determined.
Optionally, generating a modulation 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.
A target look-up table may be preset, the modulation signals corresponding to the plurality of samples may be stored, and the modulation signal corresponding to the target substance may be acquired from the target look-up table after an input operation for the absorption characteristic of the target substance is responded, so that the modulation signal corresponding to the target substance may be generated.
The embodiments in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
As will be appreciated by one of skill in the art, embodiments of the present application may be provided as a method, apparatus, or computer program product. Accordingly, embodiments of the present application 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 embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) 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 flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams 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 to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing terminal, 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 terminal 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 terminal to cause a series of operational steps to be performed on the computer or other programmable terminal to produce a computer implemented process such that the instructions which execute on the computer or other programmable terminal 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 application have been described, additional variations and modifications of these embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including the preferred embodiment and all such alterations and modifications as fall within the true scope of the embodiments of the application.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be 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. Also, 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 an … …" does not exclude the presence of other like elements in a process, method, article, or terminal that comprises the element.
The principle and the implementation of the present application are explained herein by applying specific examples, and the above description of the embodiments is only used to help understand the method and the core idea of the present application; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.
Claims (9)
1. A real-time detection system based on a 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 is also used for generating a modulation signal corresponding to a target substance according to the absorption characteristic of the target substance in the terahertz frequency band;
the transmitting module is used for outputting terahertz waves of a to-be-determined target frequency band according to the modulation signal corresponding to the target substance and feeding the terahertz waves of the target frequency band into the leaky-wave antenna;
the leaky-wave antenna is used for converting fed-in terahertz waves of a target frequency band into single-frequency terahertz signals at different angles so as to radiate the single-frequency terahertz signals to a free space;
the reflection module is used for converging single-frequency terahertz signals at a plurality of different angles in a free space so as to facilitate the receiving module to receive the signals;
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 spectral information according to the terahertz waves sent by the receiving module, performing inversion based on the frequency spectrum-space decomposition characteristic of the leaky wave antenna, and determining the real-time relative position of the target substance to the leaky wave antenna.
2. The system according to claim 1, wherein the transmitting module feeds the leaky-wave antenna by means of spatial feeding or integrated feeding.
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 is disposed at one focal point of the elliptical cylindrical mirror, and the receiving module is 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 configured to generate a gaussian modulated sine wave signal, or a segmented sine frequency modulated signal, corresponding to the target substance.
6. The system of claims 1-5, wherein the target substance detected by the system comprises a gas, solid, or liquid having an absorption characteristic in the terahertz frequency band.
7. A real-time detection method based on a terahertz leaky-wave antenna is characterized by being applied to a real-time detection system based on the terahertz leaky-wave antenna, and the method comprises the following steps:
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 signal corresponding to the target substance, feeding the terahertz waves of the target frequency band into a leaky-wave antenna, and converting the fed terahertz waves of the target frequency band into single-frequency terahertz signals at a plurality of different angles through the leaky-wave antenna so as to radiate the single-frequency terahertz signals to a free space;
the method comprises the steps of converging single-frequency terahertz signals at different angles in a free space so as to be received, obtaining spectral information according to the received terahertz waves, carrying out inversion based on the frequency spectrum-space decomposition characteristic of a leaky-wave antenna, determining the real-time relative position of a target substance to the leaky-wave antenna, and estimating the motion trail of the target substance.
8. The method of claim 7, wherein generating a modulation signal corresponding to a target substance according to an absorption characteristic of the target substance in the terahertz frequency band comprises:
and responding to the input operation aiming at the absorption characteristics of the target substance, generating a modulation signal corresponding to the target substance, and feeding the terahertz wave of the target frequency band into the leaky wave antenna.
9. The method of claim 8, wherein generating a modulation 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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