CN115166733A - Portable nondestructive reconstruction microwave imager - Google Patents
Portable nondestructive reconstruction microwave imager Download PDFInfo
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- CN115166733A CN115166733A CN202210876600.9A CN202210876600A CN115166733A CN 115166733 A CN115166733 A CN 115166733A CN 202210876600 A CN202210876600 A CN 202210876600A CN 115166733 A CN115166733 A CN 115166733A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/88—Radar or analogous systems specially adapted for specific applications
- G01S13/89—Radar or analogous systems specially adapted for specific applications for mapping or imaging
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- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
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- G01N22/00—Investigating or analysing materials by the use of microwaves or radio waves, i.e. electromagnetic waves with a wavelength of one millimetre or more
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
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Abstract
The invention discloses a portable nondestructive reconstruction microwave imager, which is an imaging device for realizing nondestructive reconstruction of a 3D holographic image of a measured object by taking ultra-wideband microwaves as an information detection carrier based on an electromagnetic wave imaging technology and an electromagnetic wave backscattering principle. The touch control system comprises a shell, a radio frequency transceiver system and a signal processing system which are arranged in the shell, and a touch control system arranged on the upper surface of the shell; the microwave is transmitted through the radio frequency transceiver system, scattered microwaves reflected by a measured object are received and transmitted to the signal processing system, the information of the measured object is reconstructed by the reflected microwaves through a microwave qualitative and quantitative method and then transmitted to the touch control system for display, meanwhile, the shell can provide hardware protection for the modules, and the shell is provided with a handheld handle, so that the carrying and the handheld detection can be facilitated.
Description
Technical Field
The invention relates to the technical field of electromagnetic wave imaging, in particular to a portable nondestructive reconstruction microwave imager.
Background
Currently, the commonly used imaging techniques in industry are: 1. infrared thermal imaging techniques; 2. ultrasonic imaging technology; x-ray (CT) imaging techniques; 4. magnetic resonance imaging techniques, and the like.
(1) The infrared thermal imaging technique has imaging capability for objects with significant infrared thermal characteristics, but loses its imaging capability when the target does not contain significant infrared thermal characteristics.
(2) Because ultrasonic waves are attenuated significantly in air, this imaging technique is not suitable for objects in an air environment.
(3) The X-ray (CT) imaging technology can theoretically realize high-precision imaging, but X-rays have ionizing radiation hazard to a human body, cannot be used for a long time, and has high equipment cost.
(4) The nuclear magnetic resonance imaging technology can also provide high-precision images, but the nuclear magnetic resonance imaging equipment is large in size, high in price and harmful to human bodies to a certain extent.
Therefore, how to provide an imaging instrument with small environmental limitation, high measurement accuracy, high safety, small volume and portability is a problem that needs to be solved by those skilled in the art.
Disclosure of Invention
In view of this, the invention provides a portable nondestructive reconstruction microwave imager, which is an imaging device based on an electromagnetic wave imaging technology and an electromagnetic wave backscattering principle, and using ultra-wideband microwaves as an information detection carrier to realize nondestructive reconstruction of a 3D holographic image of a measured object. The attenuation of the microwave in the air is very small, so the microwave imaging system is not influenced by the air environment, such as personnel behind a detected wall body and a metal body behind a detected shelter, and theoretically, the imaging precision of the microwave imaging technology is higher than that of the ultrasonic imaging technology. The device adopts a broadband low-power microwave signal, meets the IEEE (institute of American Engineers) 802.15.4 standard, has radiation power far lower than the radiation limit value harmful to human bodies, is high in safety, can be used by personnel for a long time, and is high in cost performance compared with an X-ray (CT) imaging device. Compared with nuclear magnetic resonance technology and equipment, the microwave imaging equipment has the advantages of nondestructive imaging safety, low manufacturing cost, small volume, portability and easy popularization.
In order to achieve the purpose, the invention adopts the following technical scheme:
a portable non-destructive reconstruction microwave imager, comprising: the mobile terminal comprises a shell, a radio frequency transceiving system and a signal processing system which are arranged in the shell, and a touch system arranged on the upper surface of the shell;
the two symmetrical side edges of the shell are provided with integrally-formed curved handheld handles;
the radio frequency transceiving system is provided with a microwave signal transmitting end, a microwave signal receiving end, a microwave signal processing module and an ultra-wideband annular antenna; the microwave signal processing module is controlled by the touch system to transmit electromagnetic waves through the ultra-wideband annular antenna and the microwave signal transmitting end in sequence, and the microwave signal reflected by the object to be measured is received by the microwave signal receiving end and transmitted to the signal processing system;
the ultra-wideband loop antenna comprises a plurality of groups of antenna array units, each group of antenna array units is formed by different array arrangements of electrically small antennas by adopting an intelligent antenna array technology, and particularly adopts a low-redundancy and local high-anisotropy arrangement scheme; each group of antenna array units are connected by adopting a multi-channel parallel feed network;
the signal processing system is provided with a microwave signal interface and a processor, the microwave signal interface receives a reflected microwave signal transmitted by the radio frequency transceiving system, reconstructs information of a measured object according to the reflected microwave signal by adopting a microwave qualitative and quantitative imaging method and transmits the information to the touch system;
a signal isolation cover is arranged between the radio frequency transceiving system and the signal processing system, and the radio frequency transceiving system is isolated and sealed between the signal isolation cover and the shell;
the touch system receives and displays the information of the measured object.
The technical effect of the technical scheme is that most of the microwave imagers on the market are the separation devices of a radio frequency transceiver system, a signal processing system and a touch system at present, and the microwave imagers are low in integration degree and large in size. The invention adopts the integrated design of the radio frequency transceiver system, the signal processing system and the touch system, overcomes the mutual interference among system modules, and leads the equipment to be lighter and more miniaturized;
each group of antenna array units correspondingly complete the transmission and reception of electromagnetic wave signals under different modes, and different antenna array units are selected to work to realize the measurement requirements of different measurement distances, directions and reflected signal strengths; the electrically small antenna is an antenna with a wavelength much smaller than that of a working electromagnetic wave signal, has compact size and lower cost, and is convenient for the arrangement of antenna units in a limited space; the multi-channel parallel feed network is adopted, each channel in the feed network is an independent channel, and the lengths of the bent microstrip lines of the channels are consistent, so that the phase lags of signals in the channels are consistent;
the hand-held handle with curvature arranged on the side edge of the shell conforms to the ergonomic design, so that the hand-held grip is more comfortable and convenient;
the adopted processor has a high integration level, high frequency, wide frequency band and multiple input multiple output processing scheme, and simultaneously adopts a wireless data communication chip, so that the invention reduces the system volume while ensuring the information reliability;
the signal isolation cover plays a role in shielding external interference signals and simultaneously plays a role in protecting hardware of the radio frequency receiving and transmitting system.
Preferably, the ultra-wideband loop antenna is a multi-element antenna array, is designed for an end-fire array, is formed by two half-wave dipoles separated by half wavelength, has a bidirectional radiation directional diagram, and emits a UWB band signal; the ultra-wideband loop antenna has the length of about 1.9 cm and the width of about 1.3 cm, and the gain of the ultra-wideband loop antenna is stable in the whole frequency band and is about 6dB or higher; the UWB frequency range of the ultra-wideband loop antenna is 3.1GHz-10.6GHz, and the electromagnetic wave wavelength range corresponding to the UWB frequency range is 10 cm-3 cm.
Compared with a broadside array, the end-fire array has the advantages that the beam width is narrower, the gain is lower, the directivity is higher, the radiation direction of the end-fire array is parallel to the array plane and perpendicular to the oscillator, the radiation direction of the oscillator faces the tail end of the array, namely, the array radiation direction is consistent with the oscillator radiation direction, the equipment is small in size, and the frequency band is wide.
Preferably, the radio frequency transceiving system comprises a signal source, a power amplifier, a radio frequency switch, a low noise amplifier, a bandwidth filter, a radio frequency amplifier, a local oscillator, a mixer, an intermediate frequency amplifier, an intermediate frequency filter, an analog/digital converter and a wireless data communication chip; after being amplified by a power amplifier, a signal transmitted by a signal source passes through a radio frequency switch, sequentially passes through a low noise amplifier, a bandwidth filter, a radio frequency amplifier, a local oscillator, a mixer, an intermediate frequency amplifier, an intermediate frequency filter and an analog/digital converter, and finally outputs electromagnetic waves to a microwave signal transmitting end through a wireless data communication chip; wherein the local oscillator generates oscillation and transmits the oscillation to the mixer for mixing.
Preferably, the touch system includes a touch display screen for performing touch control and graphic display.
Preferably, a power charging interface is arranged on one side surface of the shell;
preferably, a control key and a sound box are arranged on the side edge of the casing, and the control key and the sound box are electrically connected with a processor of the signal processing system.
Preferably, the casing is made of polyvinyl chloride material.
Preferably, the measured object information includes a measured object position, an image, a geometric structure, and a material characteristic.
Preferably, the design process of the ultra-wideband loop antenna comprises the following steps:
step 1: determining the working frequency band of the equipment;
step 2: determining an initial geometric structure of the electrically small antenna according to the working frequency band;
and step 3: electrically small antennas are arrayed according to a low redundancy and local high-anisotropy arrangement scheme to form a plurality of groups of antenna array units;
and 4, step 4: simulating each group of antenna array units by adopting a domain decomposition method, and calculating a beam angle;
and 5: determining a multi-channel parallel feed network connected with all the antenna array units according to the beam angle;
step 6: performing linear network analysis on the multi-channel parallel feed network, and drawing a system gain diagram;
and 7: and judging the performance of the antenna array unit in the use environment according to a system gain diagram, and adjusting the geometrical structures of the multi-channel parallel feed network and the electrically small antenna according to the performance feedback to form the ultra-wideband loop antenna.
According to the technical scheme, compared with the prior art, the invention discloses a portable nondestructive reconstruction microwave imager which is characterized in that an electromagnetic wave is used for irradiating a measured object, the scattered electromagnetic wave of the irradiated object is analyzed based on the electromagnetic wave qualitative and quantitative imaging technology, and the geometric structure and the material characteristic information of the measured object are reconstructed. The small antenna planar array adopted by the invention is a multi-element antenna array, so that the equipment has small volume and wide frequency band, the adopted processor has a processing scheme of high integration level, high frequency, wide frequency band and multiple input and multiple output, and a wireless data communication chip is adopted, so that the system volume is reduced while the information reliability is ensured. The microwave imager adopts electromagnetic waves in a microwave frequency band, the frequency range of the electromagnetic waves is 3.1GHz-10.6GHz, the corresponding wavelength of the electromagnetic waves is 10 cm-3 cm, the frequency band has higher penetration capacity and suitable imaging precision, and the device has the advantages of high imaging resolution, small volume, light weight and low electromagnetic wave radiation and can be safely used for a long time.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic diagram of a lower side structure of a handheld microwave imager provided by the present invention;
FIG. 2 is a schematic diagram of an upper side structure of a hand-held microwave imager according to the present invention;
FIG. 3 is a block diagram of an RF transceiver system according to the present invention;
fig. 4 is a schematic diagram of an ultra-wideband loop antenna structure according to the present invention;
figure 5 is a schematic diagram of an ultra-wideband loop antenna simulation provided by the present invention;
fig. 6 is a diagram illustrating an ultra-wideband loop antenna port test S11 and a gain diagram according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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 invention.
The embodiment of the invention discloses a portable nondestructive reconstruction microwave imager, which is a high-precision imaging device with small volume, light weight, high safety, real-time detection, 2D and 3D imaging functions, high cost performance and a material distinguishing function, and is mainly used for detecting an object behind a shielding object and reconstructing the position, the image, the geometric mechanism and the material characteristics of a target object.
A portable non-destructive reconstruction microwave imager, comprising: the mobile terminal comprises a machine shell 1, a radio frequency transceiving system and a signal processing system which are arranged in the machine shell 1, and a touch system 2 arranged on the upper surface of the machine shell 1; two symmetrical sides of the casing 1 are provided with integrally formed curved handholds 3; the radio frequency transceiving system is provided with a microwave signal transmitting end, a microwave signal receiving end, a microwave signal processing module and an ultra-wideband annular antenna; the touch system 2 controls the microwave signal processing module to emit electromagnetic waves through the ultra-wideband loop antenna and the microwave signal emitting end, receives microwave signals reflected by a measured object through the microwave signal receiving end and transmits the microwave signals to the signal processing system; the signal processing system is provided with a microwave signal interface and a processor, the microwave signal interface receives the reflected microwave signal transmitted by the radio frequency transceiving system, reconstructs the information of the object to be detected according to the reflected microwave signal by adopting a microwave directional and quantitative imaging method, and transmits the information to the touch system 2; a signal isolation cover is arranged between the radio frequency transceiving system and the signal processing system, and the radio frequency transceiving system is isolated and sealed between the signal isolation cover and the shell 1; the touch system 2 receives and displays information of the object to be measured.
Example 1
In a specific embodiment, the ultra-wideband loop antenna is a multi-element antenna array, is designed for an end-fire array, is formed by two half-wave dipoles separated by half wavelength, has a bidirectional radiation directional pattern, and emits an ultra-wideband signal; the ultra-wideband loop antenna comprises a plurality of groups of antenna array units, each group of antenna array units is formed by different array arrangements of electrically small antennas by adopting an intelligent antenna array technology, and particularly adopts a low-redundancy and local high-anisotropy arrangement scheme; each group of antenna array units are connected by adopting a multi-channel parallel feed network; each group of antenna array units correspondingly complete the transmission and reception of electromagnetic wave signals under different modes, and different antenna array units are selected to work to realize the measurement requirements of different measurement distances, directions and reflected signal strengths; the length of the ultra-wideband loop antenna is about 1.9 cm, the width of the ultra-wideband loop antenna is about 1.3 cm, and the gain of the ultra-wideband loop antenna is stable in the whole frequency band and is about 6dB or so; the UWB frequency range of the ultra-wideband loop antenna is 3.1GHz-10.6GHz, and the electromagnetic wave wavelength range corresponding to the UWB frequency range is 10 cm-3 cm.
The ultra-wideband loop antenna structure is shown in fig. 4, and adopts electrically small antenna technology, uses a high dielectric constant dielectric slab as a substrate, and designs an intelligent electrically small antenna array unit, which has the characteristics of small size, wide frequency band and high gain. The working frequency band of the antenna is 3.1GHz-10.6GHz, the size of a single antenna unit is in the size level of 0.1cm (thickness) 1cm (width) 2cm (length), the size level is far smaller than the size level (the length is larger than 5 cm) of a conventional half-wave design scheme, the actual gain of each frequency point of the antenna unit is stable and larger than 5dBi, and the antenna unit belongs to the range of high-gain antennas.
Compared with a broadside array, the end-fire array has the advantages that the beam width is narrower, the gain is lower, the directivity is higher, the radiation direction of the end-fire array is parallel to the array plane and perpendicular to the oscillator, the radiation direction of the oscillator faces the tail end of the array, namely, the array radiation direction is consistent with the oscillator radiation direction, the equipment is small in size and wide in frequency band; the electrically small antenna is an antenna with wavelength much smaller than that of working electromagnetic wave signals, has compact size and lower cost, and is convenient for the arrangement of antenna units in a limited space; the multi-channel parallel feed network is adopted, each channel in the feed network is an independent channel, and the lengths of the bent microstrip lines of the channels are consistent, so that the phase lags of signals in the channels are consistent. The simulation of the ultra-wideband loop antenna, the port test S11, and the gain map are shown in fig. 5 and fig. 6, respectively, in fig. 6, the dotted line represents the measurement value of the port test S11, and the solid line represents the simulation value of the port test S11.
Example 2
In the above embodiments, the microwave imager of the present invention is a portable handheld device, and the device includes curved handle bars (ears) at the left and right ends. Except for the handle, the body portion of the device was about 30 cm long, about 21 cm wide, about 6 cm high and weighed about 2.7 kg. The power charging interface of the equipment is arranged at the upper left corner of the equipment, the voltage input by the power supply is 19V, and the maximum charging power is 90W. The equipment host consists of a display screen, a signal processor and a radar wave receiving and transmitting system. The equipment shell is made of polyvinyl chloride.
In order to further optimize the technical scheme, the radio frequency transceiving system comprises a signal source, a power amplifier, a radio frequency switch, a low noise amplifier, a bandwidth filter, a radio frequency amplifier, a local oscillator, a mixer, an intermediate frequency amplifier, an intermediate frequency filter, an analog/digital converter and a wireless data communication chip; after being amplified by a power amplifier, a signal transmitted by a signal source passes through a radio frequency switch in a control way, sequentially passes through a low noise amplifier, a bandwidth filter, a radio frequency amplifier, a local oscillator, a mixer, an intermediate frequency amplifier, an intermediate frequency filter and an analog/digital converter, and finally outputs electromagnetic waves to a microwave signal transmitting end through a wireless data communication chip; the local oscillator generates oscillation and transmits the oscillation to the mixer for mixing.
In order to further optimize the above technical solution, the touch system includes a touch display screen for performing touch control and graphic display.
In order to further optimize the technical scheme, a power supply charging interface is arranged on one side surface of the shell;
in order to further optimize the technical scheme, a control key and a sound box are arranged on the side edge of the machine shell, and the control key and the sound box are electrically connected with a processor of the signal processing system.
In order to further optimize the technical scheme, the shell is made of polyvinyl chloride materials.
In order to further optimize the technical scheme, the information of the measured object comprises the position, the image, the geometric mechanism and the material characteristics of the measured object.
Example 3
In the above embodiment, further, the design process of the ultra-wideband loop antenna includes:
s1: determining the working frequency band of the equipment;
s2: determining an initial geometric structure of the electrically small antenna according to the working frequency band;
s3: electrically small antennas are arrayed according to a low redundancy and local high opposite configuration scheme to form a plurality of groups of antenna array units;
s4: simulating each group of antenna array units by adopting a domain decomposition method, and calculating a beam angle;
s5: determining a multi-channel parallel feed network connected with all antenna array units according to the beam angle;
s6: carrying out linear network analysis on the multi-channel parallel feed network, and drawing a system gain diagram;
s7: and judging the performance of the antenna array unit in the use environment according to the system gain diagram, and adjusting the multi-channel parallel feed network and the electrically small antenna geometric structure according to the performance feedback to form the ultra-wideband loop antenna.
Example 4
In one embodiment, to achieve real-time reconstruction and identification of the target object, independently developed microwave qualitative and quantitative imaging methods are employed, including qualitative microwave imaging algorithms and quantitative microwave imaging algorithms. Based on the two algorithms, the imager can rapidly reconstruct a 3D geometric image of a measured object and has the capability of identifying the material characteristics of the measured object. In order to realize the detection (capture) and identification of a target object, firstly, a qualitative microwave imaging algorithm is used for completing the rapid capture test of the target object, and then, a quantitative microwave imaging algorithm is used for realizing the material identification of the target object; and reconstructing a 3D geometric image of the measured object based on the capturing test and the material identification, and realizing the imaging of the measured target object.
The processing process of carrying out qualitative and quantitative analysis and identification on the target object comprises the following steps:
s1: emitting detection microwave signals, collecting reflected microwave signals, and selecting an interested detection area from the reflected microwave signals;
s11: setting working parameters of a microwave imager, determining signal frequency, and transmitting a detection microwave signal with preset frequency;
s12: setting a test background to finish a calibration test;
s13: setting an observation area, and acquiring a reflected microwave signal of the observation area under a calibration test as an original signal, wherein the original signal is a calibrated pure original signal;
s14: selecting a detection area according to the position of a receiving and transmitting antenna (ultra-wideband annular antenna) of a microwave imager;
s2: a discrete gridding detection area; dispersing a detection area according to the wavelength grid of the detected microwave signal;
s3: constructing a Green function according to the discrete gridding detection area, and constructing an electromagnetic wave signal wave equation set based on the Green function;
s31: constructing a Green function based on the relative position of each discrete grid point of the detection area and the transmitting point and the receiving point;
s32: constructing an electromagnetic wave signal wave equation set based on the Green function, the detected microwave signal and the reflected microwave signal;
s4: performing qualitative analysis on the electromagnetic wave signal wave equation set by adopting a Bonn approximation method and a matched filter method to obtain a qualitative imaging result and finish qualitative imaging of a target object; the qualitative imaging result is the shape imaging result of the target object;
s41: normalizing the electromagnetic wave signal wave equation set based on Bern approximation;
s42: obtaining the approximate solution of the wave equation of the linearized equation set by adopting a matched filter method, realizing rapid qualitative imaging and obtaining a qualitative imaging result;
s5: according to the qualitative imaging result of the target object, refining the grid of the target object region, reconstructing a Green's function and an electromagnetic wave signal wave equation set, carrying out quantitative analysis by adopting a Newton slope optimization algorithm to obtain a quantitative imaging result, and carrying out characteristic discrimination on the target object to obtain the material characteristic of the target object; obtaining the size data of the target object by quantitative analysis;
s51: redefining a target area according to the energy distribution in the qualitative imaging result;
s52: subdividing a mesh target area, and reconstructing a new Green function;
s53: reconstructing a new electromagnetic wave signal wave equation set based on the new Green function;
s54: matrixing a new electromagnetic wave signal wave equation set;
s55: solving a new matrixing electromagnetic wave signal wave equation set based on a Newton gradient method to obtain a new wave equation set solution;
s56: and (5) realizing quantitative imaging according to the new fluctuation equation group solution, obtaining a quantitative imaging result, and judging the material characteristics of the target object. Quantitative imaging is carried out, namely, size parameters of qualitative imaging are obtained;
s6: according to the qualitative imaging result, the quantitative parameters and the material characteristics, adopting an ant colony algorithm to intelligently identify the model in the target object library corresponding to the target object, outputting the identification model, and finally completing the identification of the target object;
s61: calling a stored target model electromagnetic wave characteristic library;
s62: inquiring an electromagnetic wave characteristic library of a comparison target model by adopting an ant colony algorithm based on a qualitative imaging result and a quantitative imaging result, and calculating to obtain a contrast ratio;
s63: and outputting the recognition model as a target object model according to the contrast. And (4) sorting the contrast, and selecting the target model corresponding to the highest contrast as the target object model.
The recognition result is to display the target object image and the type of the target object, and for example, it is determined that the target object image is a substance such as a mobile phone, a usb flash drive, or a cable.
The specific process of imaging the measured target object comprises the following steps:
s21: fourier transform is carried out on the reflected microwave signals;
s22: carrying out array antenna amplitude weighting on the signals subjected to Fourier transform;
s23: performing scanning phase weighting on the weighted signals;
s24: carrying out focusing phase weighting on the signal after the scanning phase weighting;
s25: performing two-dimensional fast Fourier inverse transformation on the signal after focusing phase weighting to obtain a two-dimensional image signal;
s26: and carrying out three-dimensional image processing and inversion on the two-dimensional image signal to obtain a three-dimensional image of the measured object.
The method can realize non-iterative real-time qualitative microwave imaging, automatic target object boundary identification and intelligent target object material identification through a qualitative and quantitative microwave imaging algorithm.
Example 5
The working process of the portable lossless reconstruction microwave imager comprises the following steps:
firstly, the system sets working parameters of the system through a touch display screen and starts imaging detection;
after the imaging detection is started, the microwave radio frequency transceiver transmits a broadband microwave signal (UWB) to the object to be detected;
when the microwave signal contacts the object to be measured, the object to be measured generates microwave scattering waves which carry the material characteristics and the structure information of the object to be measured and propagate outside the object to be measured, and the scattering microwave signal is reversely propagated and received by the microwave radio frequency transceiver;
the signal processor analyzes the amplitude and phase data of scattered waves of the scattered microwave signals by adopting microwave qualitative and quantitative imaging technology based on the electromagnetic wave backscattering principle according to the received scattered microwave signals, and reconstructs the position, geometric structure information and material characteristic information of the measured object;
and finally displaying the reconstructed object structure information by a touch display screen.
The embodiments in the present description 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. The device disclosed in the embodiment corresponds to the method disclosed in the embodiment, so that the description is simple, and the relevant points can be referred to the description of the method part.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (7)
1. A portable non-destructive reconstruction microwave imager, comprising: the mobile terminal comprises a shell, a radio frequency transceiving system and a signal processing system which are arranged in the shell, and a touch system arranged on the upper surface of the shell;
the two symmetrical side edges of the shell are provided with handheld handles;
the radio frequency transceiving system is provided with a microwave signal transmitting end, a microwave signal receiving end, a microwave signal processing module and an ultra-wideband annular antenna; the microwave signal processing module is controlled by the touch system to transmit electromagnetic waves through the ultra-wideband annular antenna and the microwave signal transmitting end in sequence, and the microwave signal reflected by the object to be measured is received by the microwave signal receiving end and transmitted to the signal processing system;
the ultra-wideband loop antenna comprises a plurality of groups of antenna array units, wherein each group of antenna array units is formed by different array arrangements of electrically small antennas by adopting a low-redundancy and local high-anisotropy arrangement scheme; each group of antenna array units are connected by adopting a multi-channel parallel feed network;
the signal processing system is provided with a microwave signal interface and a processor, the microwave signal interface receives a reflected microwave signal transmitted by the radio frequency transceiving system, reconstructs information of a measured object according to the reflected microwave signal and transmits the information to the touch system;
a signal isolation cover is arranged between the radio frequency transceiving system and the signal processing system, and the radio frequency transceiving system is isolated and sealed between the signal isolation cover and the shell;
and the touch system receives and displays the information of the measured object.
2. The portable microwave imager of claim 1, wherein the radio frequency transceiver system comprises a signal source, a power amplifier, a radio frequency switch, a low noise amplifier, a bandwidth filter, a radio frequency amplifier, a local oscillator, a mixer, an intermediate frequency amplifier, an intermediate frequency filter, an analog-to-digital converter, and a wireless data communication chip; after being amplified by a power amplifier, a signal transmitted by a signal source passes through a radio frequency switch in a control way, sequentially passes through a low noise amplifier, a bandwidth filter, a radio frequency amplifier, a local oscillator, a mixer, an intermediate frequency amplifier, an intermediate frequency filter and an analog/digital converter, and finally outputs electromagnetic waves to a microwave signal transmitting end through a wireless data communication chip; the local oscillator generates oscillation and transmits the oscillation to the mixer for mixing.
3. The portable microwave imager of claim 1, wherein the ultra-wideband loop antenna is formed using two half-wave dipoles separated by half a wavelength and having a bidirectional radiation pattern to transmit UWB band signals.
4. The portable microwave imager with nondestructive reconstruction of claim 1, wherein the touch system includes a touch display screen for touch control and graphic display.
5. The portable microwave imager for nondestructive reconstruction of claim 1, characterized in that a power charging interface is disposed on one side of the housing.
6. The portable nondestructive microwave imager of claim 1, wherein said housing is made of polyvinyl chloride material.
7. The portable nondestructive microwave imager of claim 1 wherein the object information includes object position, image, geometry and material characteristics.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202210876600.9A CN115166733B (en) | 2022-07-25 | 2022-07-25 | Portable lossless reconstruction microwave imager |
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