CN103207321B - System and method for measuring pulse microwave radiation field distribution based on thermoacoustic effect - Google Patents
System and method for measuring pulse microwave radiation field distribution based on thermoacoustic effect Download PDFInfo
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- CN103207321B CN103207321B CN201310136284.2A CN201310136284A CN103207321B CN 103207321 B CN103207321 B CN 103207321B CN 201310136284 A CN201310136284 A CN 201310136284A CN 103207321 B CN103207321 B CN 103207321B
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Abstract
The invention discloses a system and method for measuring pulse microwave radiation field distribution based on a thermoacoustic effect. The measuring system comprises a measured pulse microwave source, an integrated detector, a weak signal amplifier A, a data collecting system, a function generator and a computer. The integrated detector, the weak signal amplifier A, the data collecting system and the computer are sequentially connected. The measured pulse microwave source is arranged below the integrated detector, and the function generator is respectively connected with the data collecting system and the computer. The integrated detector is used for receiving thermoacoustic signals, and the thermoacoustic signals are collected through the data collecting system. A digital signal processing (DSP) chip is used for rebuilding a thermoacoustic image in real time to reflect microwave field energy distribution. The system and method has the real-time image rebuilding capacity, can obtain energy density distribution of the pulse microwave radiation field fast in real time and has high resolution.
Description
Technical field
The invention belongs to radiobiology and radiation protection to learn a skill field, the measuring system of particularly a kind of pulsed microwave radiation field distribution based on thermoacoustic effect and method.
Background technology
Along with the development of Modern High-Tech, microwave is widely used in military, civilian, and develops as important " soft destruction " weapon in developed country, receives the concern of people.Microwave irradiation biosome, must accurately grasp its irradiation field strength distribution accurately could judge dose-effect relationship.Because microwave has the features such as peak power is large, the duration of pulse is short, pulse envelope response is fast, general microwave leaks and can respond the change not catching up with pulse envelope by instrument, and also limited to the holding capacity of its high power pulsed ion beams, the accuracy thus measured is poor.Adopt HP8991A peak power meter, can obtain pulse power value, but have with a certain distance from radiator during biosome irradiation, therefore need be asked calculation by formula by the actual receptible microwave density of field energy of irradiation animal, and error is large, measuring accuracy is not high.
Hot method for acoustic and technology in microwave office to any point of radiator irradiates can measure pulse power relative intensity, in order to represent demonstrate by irradiated biological body very large superiority in the Relative distribution of microwave energy that accepts.When thermoacoustic effect is with pulse microwave certain material of irradiation, this material absorbing microwave energy can cause transient temperature rise, if the pulsewidth of microwave is narrow, thermal diffusion can not be there is in the energy absorbed in microwave pulse duration, now as adiabatic expansion can be regarded, thermal energy is that mechanical energy radiate with ultrasound modalities, is thermoacoustic effect.
Hot acoustical signal is mainly derived from by the inner absorption difference to microwave of irradiated object, if very little by irradiated object, littlely regard a point sound source as to being similar to, point sound source moves in pulsed microwave radiation field, because absorber absorption coefficient is the same, determine that the single factor of hot acoustical signal size is the energy distribution of microwave radiation field.By the hot acoustic signal intensity distribution recorded, the energy density distribution of pulsed microwave radiation field indirectly effectively can be measured.
Summary of the invention
Primary and foremost purpose of the present invention is that the shortcoming overcoming prior art is with not enough, provides a kind of measuring system of the pulsed microwave radiation field distribution based on thermoacoustic effect.
Another object of the present invention is to provide the method using above-mentioned measuring system ranging pulse microwave radiation field energy distribution.
Object of the present invention is achieved through the following technical solutions: a kind of measuring system of the pulsed microwave radiation field distribution based on thermoacoustic effect, comprises measured pulse microwave source, integrative detection device, small signals amplification device A, data acquisition system (DAS), function generator and computing machine; Integrative detection device, small signals amplification device A, data acquisition system (DAS) are connected successively with computing machine, and measured pulse microwave source is arranged at the below of integrative detection device, and function generator is connected with data acquisition system (DAS), computing machine respectively;
Described integrative detection device comprises focused transducer, coupler, point sound source and detector signal line; Focused transducer is arranged at the top of coupler, and point sound source is arranged at the bottom of coupler, and detector signal line is drawn from the tail end of focused transducer; Detector signal line is connected with small signals amplification device A;
The dominant frequency of described focused transducer is 1 ~ 30MHz, and array element diameter is 6 ~ 30mm, and focal length is 1 ~ 8cm; Focused transducer guarantee point sound source is just in energy transducer focus and goes out, and is mainly used in the hot acoustical signal that acceptance point sound source produces;
The hypomere of described coupler is back taper, bores high 3cm, and epimere is tubulose, and the diameter of pipe is 1.5mm, and pipe range is preferably 5cm; Coupler is mainly used in holding acoustic coupling medium;
Described coupler is tygon coupler;
Described coupler is built with acoustic coupling medium;
Described acoustic coupling medium is preferably water or mineral oil, is mainly used in coupling heat by conduction acoustical signal;
The carbon ball of described point sound source to be diameter be 1mm, for generation of hot acoustical signal;
Described data acquisition system (DAS) is provided with PXI bus computer, small signals amplification device B and data collecting card, and data collecting card is inserted on PXI bus computer PCI slot, and small signals amplification device B is connected to the signal input part of data collecting card by BNC line; Data acquisition system (DAS) is mainly amplified ultrasonic signal and is gathered, and the signal storage collected is in computing machine;
Described data collecting card adopts the structural system of DSP data collecting card+CPU managed storage card;
Described DSP data collecting card is made up of data-signal process chip (DSP), modulus conversion chip (AD);
Described computer installation has unit filtering back projection software; Utilizing malab(or c language etc.) data reconstruction collected goes out to reflect the image of pulsed microwave energy Density Distribution by the unit filtering back projection software of software programming;
Described unit filtering back projection software comprises filtration module, shadowgraph arc module, display module and three-dimensional reconstruction module; Wherein the function of filtration module is data to carry out frequency domain filtering, Wavelet transformation, gets maximal value, the process such as normalization; The Main Function of shadowgraph arc module is the signal back projection that processed on two-dimensional surface; The function of display module is two dimensional image to be shown on display; The function of three-dimensional reconstruction module is to organize two dimensional image composition 3-D view more;
Described integrative detection device and data acquisition system (DAS) electrical connection;
Described integrative detection device is fixed on three-dimensional platform by support;
Described three-dimensional platform is made up of the support of rigidity, can move by stepping up and down, is mainly used in the position regulating integrative detection device, carries out position scanning;
The effect of described small signals amplification device A is that the hot acoustical signal detected by integrative detection device is amplified.
The effect of described function generator is that trigger pulse microwave source exports pulse microwave and data acquisition system signal simultaneously.
Use the method for above-mentioned measuring system ranging pulse microwave radiation field energy distribution, comprise following operation steps:
(1) integrative detection device is placed in pulse microwave field, makes pulse microwave directed to external radiation by waveguide; Start the measuring system based on the pulsed microwave radiation field distribution of thermoacoustic effect, the point by point scanning in measured pulse microwave field of integrative detection device, excitaton source excites the point sound source in integrative detection device, and point sound source absorbs energy and causes instantaneous temperature to raise, thus stress produce hot acoustical signal;
(2) integrative detection device is fixed on support, mobile integrative detection device; The coupling medium transmission of the hot acoustical signal that point sound source produces in integrative detection device, is focused ultrasonic transducer and receives, then after small signals amplification device A amplifies, and records the hot acoustical signal of each point, be stored in computing machine by data acquisition system; Integrative detection device often moves and moves a step, data acquisition system once, Computer Storage one secondary data;
(3) utilize the hot acoustical signal of acquisition system record, by Origin process, obtain the curve that in microwave radiation field, hot acoustical signal changes with detector position;
In step (1):
Described excitaton source is pulse microwave generator;
The pulse microwave wavelength of described pulse microwave generator is 0.01mm ~ 1m, pulse width τ is 1ns ~ 1 μ s;
Invention mechanism of the present invention: integrative detection device is placed in measured pulse microwave field, point sound source in integrative detection device is under the exciting of pulse microwave, absorbing energy causes instantaneous temperature to raise, and because Thermoelastic regime inspires hot acoustical signal, hot acoustic pressure can be designated as:
Wherein: Γ is the resistance to gloomy parameter of Green, and β is thermal expansivity, μ
afor absorption coefficient, H
0for pulse microwave energy metric density;
Γ, β, μ
aonly relevant with point sound source character, H
0for the energy density of pulse microwave field point, it is relevant with the position of place microwave field;
Identical point sound source moves in microwave field, causes the hot acoustical signal amplitude change inspired, and the size of hot acoustical signal amplitude has directly reacted the microwave energy power of integrative detection device present position;
By the hot acoustical signal of data acquisition system (DAS) record integrative detection device present position, by data fitting, obtain the relation of measured position-Re acoustical signal amplitude.In actual measurement, by the relation of measured matter temperature-Re acoustical signal, the hot acoustic image of reconstruction or the hot acoustical signal of one dimension counter push away to analyze obtain the field energy of measured position, eventually through the energy distribution image of Real time vision pulse microwave field.Native system receives hot acoustical signal by integrative detection device and by the hot acoustical signal of data acquisition system, utilizes the hot acoustic image of dsp chip real-time reconstruction to react microwave field energy distribution or to be stored into terminal by PXI bus transfer; Gone out in pulse microwave field to the energy of point by inversion program Inversion Calculation.
The present invention has following advantage and effect relative to prior art:
(1) the present invention receives hot acoustical signal by integrative detection device and by the hot acoustical signal of data acquisition system, utilize the hot acoustic image of dsp chip real-time reconstruction to react microwave field energy distribution or to be stored into terminal by PXI bus transfer, there is real time image reconstruction ability, can obtain in real time and show microwave field energy distribution; The hot acoustical signal amplitude utilizing measured position place point sound source to produce under microwave-excitation and the positive correlation of position to carry out in Inversion Calculation microwave field the energy density distribution in certain some energy density and reconstruction regions, have very high resolution.
(2) measuring system of the present invention has portability and processing capability in real time, easy and simple to handle, and integrated degree is high, working stability, and continuous operating time is long, and the cost of each assembly is lower.
Accompanying drawing explanation
Fig. 1 is the structural representation of the measuring system of the pulsed microwave radiation field distribution based on thermoacoustic effect of embodiment 1; Wherein: 2-1 measured pulse microwave source, 2-2 integrative detection device, 2-3 small signals amplification device A, 2-4 data acquisition system (DAS), 2-5 function generator, 2-6 computing machine.
Fig. 2 is the structural representation of the integrative detection device of embodiment 1; Wherein: 1-1 focused transducer, 1-2 coupler, 1-3 point sound source, 1-4 detector signal line.
Fig. 3 is the hot acoustic signal intensity of embodiment 2 and the relation curve of microwave energy density.
Fig. 4 be embodiment 3 along microwave field horizontal direction, hot acoustic signal intensity is with the change curve of detector position.
Fig. 5 be embodiment 4 along microwave field vertical direction, hot acoustical signal strong team is with the change curve of detector position.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the present invention is described in further detail, but embodiments of the present invention are not limited thereto.
Embodiment 1
As shown in Figure 1, a kind of measuring system of the pulsed microwave radiation field distribution based on thermoacoustic effect, comprises measured pulse microwave source 2-1, integrative detection device 2-2, small signals amplification device A2-3, data acquisition system (DAS) 2-4, function generator 2-5 and computing machine 2-6; Integrative detection device 2-2, small signals amplification device A2-3, data acquisition system (DAS) 2-4 are connected successively with computing machine 2-6, measured pulse microwave source 2-1 is arranged at the below of integrative detection device 2-2, and function generator 2-5 is connected with data acquisition system (DAS) 2-4, computing machine 2-6 respectively;
The structural representation of integrative detection device as shown in Figure 2, comprises focused transducer 1-1, coupler 1-2, point sound source 1-3 and detector signal line 1-4; Focused transducer 1-1 is arranged at the top of coupler 1-2, and point sound source 1-3 is arranged at the bottom of coupler 1-2, and detector signal line 1-4 draws from focused transducer 1-1 tail end; Detector signal line 1-4 is connected with small signals amplification device A2-3;
The dominant frequency of focused transducer 1-1 is 1 ~ 30MHz, and array element diameter is 6 ~ 30mm, and focal length is 1 ~ 8cm;
The hypomere of coupler 1-2 is back taper, bores high 3cm, and epimere is tubulose, and the diameter of pipe is 1.5mm, long 5cm;
Coupler 1-2 is tygon coupler; Coupler is built with acoustic coupling medium;
The carbon ball of point sound source 1-3 to be diameter be 1mm;
Data acquisition system (DAS) 2-4 is provided with PXI bus computer, small signals amplification device B and data collecting card, and data collecting card is inserted on PXI bus computer PCI slot, and small signals amplification device B is connected to the signal input part of data collecting card by BNC line;
Data collecting card adopts the structural system of DSP data collecting card+CPU managed storage card;
DSP data collecting card is made up of data-signal process chip (DSP), modulus conversion chip (AD);
Computing machine 2-6 is provided with image reconstruction software;
Integrative detection device 2-2 and data acquisition system (DAS) 2-4 electrical connection;
Integrative detection device is fixed on three-dimensional platform by support;
Three-dimensional platform is made up of the support of rigidity, can move by stepping up and down, carries out position scanning.
Embodiment 2
Use the measuring system of embodiment 1 to measure the method for the relation curve of hot acoustic signal intensity and microwave energy density, comprise following operation steps:
(1) integrative detection device is placed in pulse microwave field, makes pulse microwave (wavelength is 0.01mm ~ 1m) directed to external radiation by waveguide; Start the measuring system based on the pulsed microwave radiation field distribution of thermoacoustic effect, integrative detection device holding position in measured pulse microwave field is constant, excitaton source excites the point sound source in integrative detection device, and point sound source absorbs energy and causes instantaneous temperature to raise, thus stress produce hot acoustical signal;
(2) integrative detection device is fixed on support, keeps its invariant position, by the voltage-regulation microwave radiation energy of regulating impulse microwave source; The coupling medium mineral oil transmission of the hot acoustical signal that point sound source produces in integrative detection device, is received by ultrasonic transducer, then after small signals amplification device A amplifies, and records the hot acoustical signal of each point, be stored in computing machine by data acquisition system; Often regulate pulsatile once microwave source voltage, data acquisition system once, Computer Storage one secondary data;
(3) utilize the hot acoustical signal of acquisition system record, by Origin process, obtain the change curve of hot acoustic signal intensity radiation field energy density in microwave radiation field; Result as shown in Figure 3;
As can be seen from Figure 3, along with the increase of the microwave density of field energy, hot acoustical signal amplitude strengthens gradually.
Embodiment 3
Use the method for the energy variation trend of the measuring system ranging pulse microwave waveguide mouth horizontal direction of embodiment 1, comprise following operation steps:
(1) integrative detection device is placed in pulse microwave field, makes pulse microwave (wavelength is 0.01mm ~ 1m) directed to external radiation by waveguide; Start the measuring system based on the pulsed microwave radiation field distribution of thermoacoustic effect, the point by point scanning in measured pulse microwave field of integrative detection device, excitaton source excites the point sound source in integrative detection device, and point sound source absorbs energy and causes instantaneous temperature to raise, thus stress produce hot acoustical signal;
(2) integrative detection device is fixed on support, along waveguide mouth planar horizontal direction, moves integrative detection device with the step pitch of 5mm; The coupling medium mineral oil transmission of the hot acoustical signal that point sound source produces in integrative detection device, is received by ultrasonic transducer, then after small signals amplification device A amplifies, and records the hot acoustical signal of each point, be stored in computing machine by data acquisition system; Integrative detection device often moves and moves a step, data acquisition system once, Computer Storage one secondary data;
(3) utilize the hot acoustical signal of acquisition system record, by Origin process, obtain the curve that in microwave radiation field, hot acoustical signal changes with detector position; Result as shown in Figure 4;
As can be seen from Figure 4, along with the change of position, hot acoustical signal amplitude remains unchanged substantially, and the energy distribution describing microwave field in surveyed region is uniform.
Embodiment 4
Use the method for the energy density variation tendency of the measuring system ranging pulse microwave waveguide mouth vertical direction of embodiment 1, comprise following operation steps:
(1) integrative detection device is placed in pulse microwave field, makes pulse microwave (wavelength is 0.01mm ~ 1m) directed to external radiation by waveguide; Start the measuring system based on the pulsed microwave radiation field distribution of thermoacoustic effect, the point by point scanning in measured pulse microwave field of integrative detection device, excitaton source excites the point sound source in integrative detection device, and point sound source absorbs energy and causes instantaneous temperature to raise, thus stress produce hot acoustical signal;
(2) integrative detection device is fixed on support, along waveguide mouth vertical direction, with the vertical mobile integrative detection device of the step pitch of 5mm; The coupling medium mineral oil transmission of the hot acoustical signal that point sound source produces in integrative detection device, is received by ultrasonic transducer, then after small signals amplification device A amplifies, and records the hot acoustical signal of each point, be stored in computing machine by data acquisition system; Integrative detection device often moves and moves a step, data acquisition system once, Computer Storage one secondary data;
(3) utilize the hot acoustical signal of acquisition system record, by Origin process, obtain the curve that in microwave radiation field, hot acoustical signal changes with detector position; Result as shown in Figure 5;
As can be seen from Figure 5, along with detector is away from waveguide mouth, hot acoustical signal amplitude reduces gradually, and the energy describing microwave field in surveyed region is decayed gradually.
Above-described embodiment is the present invention's preferably embodiment; but embodiments of the present invention are not restricted to the described embodiments; change, the modification done under other any does not deviate from Spirit Essence of the present invention and principle, substitute, combine, simplify; all should be the substitute mode of equivalence, be included within protection scope of the present invention.
Claims (8)
1., based on a measuring system for the pulsed microwave radiation field distribution of thermoacoustic effect, it is characterized in that comprising measured pulse microwave source, integrative detection device, small signals amplification device A, data acquisition system (DAS), function generator and computing machine; Integrative detection device, small signals amplification device A, data acquisition system (DAS) are connected successively with computing machine, and measured pulse microwave source is arranged at the below of integrative detection device, and function generator is connected with data acquisition system (DAS), computing machine respectively;
Described integrative detection device comprises focused transducer, coupler, point sound source and detector signal line; Focused transducer is arranged at the top of coupler, and point sound source is arranged at the bottom of coupler, and detector signal line is drawn from focused transducer tail end; Detector signal line is connected with small signals amplification device A.
2. the measuring system of the pulsed microwave radiation field distribution based on thermoacoustic effect according to claim 1, is characterized in that: the dominant frequency of described focused transducer is 1 ~ 30MHz, and array element diameter is 6 ~ 30mm, and focal length is 1 ~ 8cm.
3. the measuring system of the pulsed microwave radiation field distribution based on thermoacoustic effect according to claim 1, it is characterized in that: the hypomere of described coupler is back taper, bores high 3cm, epimere is tubulose, and the diameter of pipe is 1.5mm, pipe range 5cm.
4. the measuring system of the pulsed microwave radiation field distribution based on thermoacoustic effect according to claim 3, is characterized in that: described coupler is tygon coupler; Coupler is built with acoustic coupling medium.
5. the measuring system of the pulsed microwave radiation field distribution based on thermoacoustic effect according to claim 4, is characterized in that: described acoustic coupling medium is water or mineral oil.
6. the measuring system of the pulsed microwave radiation field distribution based on thermoacoustic effect according to claim 1, is characterized in that: the carbon ball of described point sound source to be diameter be 1mm; Described data acquisition system (DAS) is provided with PXI bus computer, small signals amplification device B and data collecting card, and data collecting card is inserted on PXI bus computer PCI slot, and small signals amplification device B is connected to the signal input part of data collecting card by BNC line.
7. the measuring system of the pulsed microwave radiation field distribution based on thermoacoustic effect according to claim 1, is characterized in that: described computer installation has image reconstruction software; Described integrative detection device is fixed on three-dimensional platform by support.
8. use the method for the measuring system ranging pulse microwave radiation field energy distribution of the pulsed microwave radiation field distribution based on thermoacoustic effect described in claim 4 or 5, it is characterized in that comprising following operation steps:
(1) integrative detection device is placed in pulse microwave field, makes pulse microwave directed to external radiation by waveguide; Start the measuring system based on the pulsed microwave radiation field distribution of thermoacoustic effect, excitaton source excites the point sound source in integrative detection device, and point sound source absorbs energy and causes instantaneous temperature to raise, thus stress produce hot acoustical signal;
(2) integrative detection device is fixed on support, mobile integrative detection device; The coupling medium transmission of the hot acoustical signal that point sound source produces in integrative detection device, is received by ultrasonic transducer, then after small signals amplification device A amplifies, and records the hot acoustical signal of each point, be stored in computing machine by data acquisition system; Integrative detection device often moves and moves a step, data acquisition system once, Computer Storage one secondary data;
(3) utilize the hot acoustical signal of acquisition system record, by Origin process, obtain the curve that in microwave radiation field, hot acoustical signal changes with detector position;
Excitaton source described in step (1) is pulse microwave generator, and the pulse microwave wavelength of pulse microwave generator is 0.01mm ~ 1m, pulse width τ is 1ns ~ 1 μ s.
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| CN105004930B (en) * | 2014-04-23 | 2018-06-29 | 华南师范大学 | A kind of novel microwave sounding method and device and application |
| CN105259426A (en) * | 2014-07-18 | 2016-01-20 | 中国科学院沈阳自动化研究所 | Radiation field spatial distribution measurement apparatus and method of thermo-acoustic effect |
| CN107713990A (en) * | 2017-10-31 | 2018-02-23 | 华南师范大学 | A kind of thermoacoustic, optoacoustic, ultrasonic three mode tumor of breast detection means and method |
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