CN103207321A - 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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- CN103207321A CN103207321A CN2013101362842A CN201310136284A CN103207321A CN 103207321 A CN103207321 A CN 103207321A CN 2013101362842 A CN2013101362842 A CN 2013101362842A CN 201310136284 A CN201310136284 A CN 201310136284A CN 103207321 A CN103207321 A CN 103207321A
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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 the radiation protection field that learns a skill, particularly a kind of measuring system and method for the pulsed microwave radiation field distribution based on thermoacoustic effect.
Background technology
Along with the development of Modern High-Tech, microwave is widely used aspect military, civilian, and develops as important " soft destruction " weapon in developed country, is subjected to people's attention.The microwave irradiation biosome must accurately be grasped its irradiation field strength distribution and could accurately be judged dose-effect relationship.Characteristics such as peak power is big because microwave has, the duration of pulse is short, the pulse envelope response is fast, general microwave leaks the variation that the response of energy instrument does not catch up with pulse envelope, and is also limited to the holding capacity of its high power pulsed ion beams, thereby the accuracy of measuring is relatively poor.Adopt the HP8991A peak power meter, can obtain the pulse power value, but have with a certain distance from radiator during biosome irradiation, therefore need by formula be asked calculation by the actual receptible microwave radiation field energy density of irradiation animal, and error is big, measuring accuracy is not high.
Hot method for acoustic and technology demonstrate very big superiority aspect the relative distribution of the microwave energy that a bit can measure the pulse power relative intensity arbitrarily, be accepted by the irradiated biological body in order to expression of radiator irradiation in microwave office.Thermoacoustic effect is when using certain material of pulse microwave irradiation, this material absorbs microwave energy can cause the moment temperature rise, if the pulsewidth of microwave is narrow, thermal diffusion can not take place in the duration at microwave pulse in the energy that absorbs, can regard adiabatic expansion this moment as, heat energy is converted into mechanical energy and radiate with the ultrasound wave form, is thermoacoustic effect.
Hot acoustical signal is mainly derived from by the absorption difference of irradiation interior of articles to microwave, if it is very little by the irradiation object, for a short time, regard a point sound source as to being similar to, point sound source is mobile in the pulsed microwave radiation field, because the absorbent body coefficient is the same, the unique factor that determines hot acoustical signal size is the energy distribution of microwave radiation field.Distribute by the hot acoustic signal intensity that records, can effectively measure the energy density distribution of pulsed microwave radiation field indirectly.
Summary of the invention
Primary and foremost purpose of the present invention is to overcome the shortcoming of prior art with not enough, and a kind of measuring system of the pulsed microwave radiation field distribution based on thermoacoustic effect is provided.
A further object of the present invention is to provide uses above-mentioned measuring system to measure the method that the pulsed microwave radiation field energy distributes.
Purpose 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, integrated detector, weak signal amplifier A, data acquisition system (DAS), function generator and computing machine; Integrated detector, weak signal amplifier A, data acquisition system (DAS) are connected successively with computing machine, and the measured pulse microwave source is arranged at the below of integrated detector, and function generator is connected with data acquisition system (DAS), computing machine respectively;
Described integrated detector 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 the detector signal line is drawn from the tail end of focused transducer; The detector signal line is connected with weak signal amplifier A;
The dominant frequency of described focused transducer is 1～30MHz, and the array element diameter is 6～30mm, and focal length is 1～8cm; Focused transducer guarantee point sound source is in energy transducer focus just and goes out, and is mainly used in the hot acoustical signal that the 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 the acoustic coupling medium;
Described coupler is the tygon coupler;
The acoustic coupling medium is housed in the described coupler;
Described acoustic coupling medium is preferably water or mineral oil, is mainly used in the hot acoustical signal of coupling conduction;
Described point sound source is that diameter is the carbon ball of 1mm, for generation of hot acoustical signal;
Described data acquisition system (DAS) is provided with PXI bus computer, weak signal amplifier B and data collecting card, and data collecting card is inserted on the PXI bus computer PCI slot, and weak signal amplifier B is connected the signal input part of data collecting card by the BNC line; Data acquisition system (DAS) is mainly amplified ultrasonic signal and is gathered, and the signal storage that collects 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.) the unit filtering back projection software of software programming reconstructs the data that collect the image of reflection pulsed microwave energy Density Distribution;
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 are carried out frequency domain filtering, and small echo changes, and gets maximal value, processing such as normalization; The signal back projection that the main effect of shadowgraph arc module is to handle is on two-dimensional surface; The function of display module is two dimensional image is shown on the display; The function of three-dimensional reconstruction module is to form 3-D view with organizing two dimensional image more;
Described integrated detector and data acquisition system (DAS) are electrically connected;
Described integrated detector is fixed on the 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 regulating integrated position of detector, carries out position scanning;
The effect of described weak signal amplifier A is that the hot acoustical signal that integrated detector detects is amplified.
The effect of described function generator is that the trigger pulse microwave source is exported pulse microwave and data acquisition system (DAS) collection signal simultaneously.
Use above-mentioned measuring system to measure the method that the pulsed microwave radiation field energy distributes, comprise following operation steps:
(1) integrated detector is placed the pulse microwave field, make pulse microwave pass through the waveguide orientation to external radiation; Startup is based on the measuring system of the pulsed microwave radiation field distribution of thermoacoustic effect, the point by point scanning in the measured pulse microwave field of integrated detector, excitaton source excites the point sound source in the integrated detector, and point sound source absorbs energy and causes instantaneous temperature to raise, thereby stress produce hot acoustical signal;
(2) integrated detector is fixed on the support mobile integrated detector; The hot acoustical signal that point sound source produces is focused ultrasonic transducer and receives through the transmission of the coupling medium in the integrated detector, and after amplifying through weak signal amplifier A, the hot acoustical signal by data acquisition system (DAS) collection and record each point is stored in the computing machine again; Integrated detector whenever moves and moves a step, the data acquisition system (DAS) collection once, Computer Storage one secondary data;
(3) the hot acoustical signal of utilizing acquisition system to record is handled by Origin, obtains the curve that hot acoustical signal changes with detector position in the microwave radiation field;
In the step (1):
Described excitaton source is the pulse microwave generator;
The pulse microwave wavelength of described pulse microwave generator is 0.01mm～1m, and pulse width τ is 1ns～1 μ s;
Invention mechanism of the present invention: integrated detector places the measured pulse microwave field, point sound source in the integrated detector is under the exciting of pulse microwave, absorb energy and cause instantaneous temperature to raise, because thermoelastic mechanism inspires hot acoustical signal, hot acoustic pressure can be designated as:
Wherein: Γ is the anti-gloomy parameter of Green, and β is thermal expansivity, μ
aBe absorption coefficient, H
0Be pulsed microwave energy density;
Γ, β, μ
aOnly relevant with point sound source character, H
0Be the energy density of pulse microwave field point, its position with the place microwave field is relevant;
The identical point sound source is mobile in microwave field, and the hot acoustical signal amplitude that causes inspiring changes, and the size of hot acoustical signal amplitude has directly been reacted the microwave energy power of integrated detector present position;
Record the hot acoustical signal of integrated detector present position by data acquisition system (DAS), 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, counter the pushing away of the hot acoustic image of reconstruction or the hot acoustical signal of one dimension analyzed the field energy that obtains the measured position, finally shows the energy distribution image of pulse microwave field by computer real-time.Native system receives hot acoustical signal and gathers hot acoustical signal by data acquisition system (DAS) by integrated detector, utilizes the hot acoustic image of dsp chip real-time reconstruction to react the microwave field energy distribution or by the PXI bus transfer and store terminal into; Go out the energy of giving point in the pulse microwave field by the inversion program Inversion Calculation.
The present invention has following advantage and effect with respect to prior art:
(1) the present invention receives hot acoustical signal and gathers hot acoustical signal by data acquisition system (DAS) by integrated detector, utilize the hot acoustic image of dsp chip real-time reconstruction to react the microwave field energy distribution or by the PXI bus transfer and store terminal into, have realtime graphic and rebuild ability, can obtain and show the microwave field energy distribution in real time; Utilize the positive correlation of hot acoustical signal amplitude that measured position place point sound source produces under microwave-excitation and position to come that certain puts the energy density distribution in energy density and the reconstruction regions in the Inversion Calculation microwave field, have very high resolution.
(2) measuring system of the present invention has portability and processing capability in real time, and is easy and simple to handle, the integrated degree height, and working stability, continuous operating time is long, and the cost of each assembly is lower.
Description of drawings
Fig. 1 is the structural representation based on the measuring system of the pulsed microwave radiation field distribution of thermoacoustic effect of embodiment 1; Wherein: 2-1 measured pulse microwave source, the integrated detector of 2-2,2-3 weak signal amplifier A, 2-4 data acquisition system (DAS), 2-5 function generator, 2-6 computing machine.
Fig. 2 is the structural representation of the integrated detector 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 relation curve of hot acoustic signal intensity and the microwave energy density of embodiment 2.
Fig. 4 be embodiment 3 along the microwave field horizontal direction, hot acoustic signal intensity is with the change curve of detector position.
Fig. 5 be embodiment 4 along the microwave field vertical direction, hot acoustical signal strong team is with the change curve of detector position.
Embodiment
The present invention is described in further detail below in conjunction with embodiment and accompanying drawing, 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, integrated detector 2-2, weak signal amplifier A2-3, data acquisition system (DAS) 2-4, function generator 2-5 and computing machine 2-6; Integrated detector 2-2, weak signal amplifier 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 integrated detector 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 integrated detector comprises focused transducer 1-1, coupler 1-2, point sound source 1-3 and detector signal line 1-4 as shown in Figure 2; 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 weak signal amplifier A2-3;
The dominant frequency of focused transducer 1-1 is 1～30MHz, and the 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 the tygon coupler; The acoustic coupling medium is housed in the coupler;
Point sound source 1-3 is that diameter is the carbon ball of 1mm;
Data acquisition system (DAS) 2-4 is provided with PXI bus computer, weak signal amplifier B and data collecting card, and data collecting card is inserted on the PXI bus computer PCI slot, and weak signal amplifier B is connected the signal input part of data collecting card by the BNC line;
Data collecting card adopts the structural system of DSP data collecting card+CPU managed storage card;
The 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;
Integrated detector 2-2 and data acquisition system (DAS) 2-4 are electrically connected;
Integrated detector is fixed on the 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
The measuring system of utilization embodiment 1 is measured the method for the relation curve of hot acoustic signal intensity and microwave energy density, comprises following operation steps:
(1) integrated detector is placed the pulse microwave field, make pulse microwave (wavelength be 0.01mm～1m) by the waveguide orientation to external radiation; Startup is based on the measuring system of the pulsed microwave radiation field distribution of thermoacoustic effect, integrated detector holding position in the measured pulse microwave field is constant, excitaton source excites the point sound source in the integrated detector, and point sound source absorbs energy and causes instantaneous temperature to raise, thereby stress produce hot acoustical signal;
(2) integrated detector is fixed on the support, keeps its invariant position, by the voltage-regulation microwave radiation energy of regulating impulse microwave source; The hot acoustical signal that point sound source produces is received by ultrasonic transducer through the transmission of the coupling medium mineral oil in the integrated detector, and after amplifying through weak signal amplifier A, the hot acoustical signal by data acquisition system (DAS) collection and record each point is stored in the computing machine again; Every adjusting pulsatile once microwave source voltage, data acquisition system (DAS) collection once, Computer Storage one secondary data;
(3) the hot acoustical signal of utilizing acquisition system to record is handled by Origin, obtains the change curve of hot acoustic signal intensity radiation field energy density in the microwave radiation field; The result as shown in Figure 3;
As can be seen from Figure 3, along with the increase of microwave radiation field energy density, hot acoustical signal amplitude strengthens gradually.
Embodiment 3
Use the measuring system of embodiment 1 measure pulse microwave waveguide saliva square to the method for energy variation trend, comprise following operation steps:
(1) integrated detector is placed the pulse microwave field, make pulse microwave (wavelength be 0.01mm～1m) by the waveguide orientation to external radiation; Startup is based on the measuring system of the pulsed microwave radiation field distribution of thermoacoustic effect, the point by point scanning in the measured pulse microwave field of integrated detector, excitaton source excites the point sound source in the integrated detector, and point sound source absorbs energy and causes instantaneous temperature to raise, thereby stress produce hot acoustical signal;
(2) integrated detector is fixed on the support, along waveguide mouth planar horizontal direction, moves integrated detector with the step pitch of 5mm; The hot acoustical signal that point sound source produces is received by ultrasonic transducer through the transmission of the coupling medium mineral oil in the integrated detector, and after amplifying through weak signal amplifier A, the hot acoustical signal by data acquisition system (DAS) collection and record each point is stored in the computing machine again; Integrated detector whenever moves and moves a step, the data acquisition system (DAS) collection once, Computer Storage one secondary data;
(3) the hot acoustical signal of utilizing acquisition system to record is handled by Origin, obtains the curve that hot acoustical signal changes with detector position in the microwave radiation field; The result as shown in Figure 4;
As can be seen from Figure 4, along with the variation of position, hot acoustical signal amplitude remains unchanged substantially, has illustrated that the energy distribution of microwave field in the zone of surveying is uniform.
Embodiment 4
The measuring system of utilization embodiment 1 is measured the method for the energy density variation tendency of pulse microwave waveguide mouth vertical direction, comprises following operation steps:
(1) integrated detector is placed the pulse microwave field, make pulse microwave (wavelength be 0.01mm～1m) by the waveguide orientation to external radiation; Startup is based on the measuring system of the pulsed microwave radiation field distribution of thermoacoustic effect, the point by point scanning in the measured pulse microwave field of integrated detector, excitaton source excites the point sound source in the integrated detector, and point sound source absorbs energy and causes instantaneous temperature to raise, thereby stress produce hot acoustical signal;
(2) integrated detector is fixed on the support, along waveguide mouth vertical direction, with the vertical mobile integrated detector of the step pitch of 5mm; The hot acoustical signal that point sound source produces is received by ultrasonic transducer through the transmission of the coupling medium mineral oil in the integrated detector, and after amplifying through weak signal amplifier A, the hot acoustical signal by data acquisition system (DAS) collection and record each point is stored in the computing machine again; Integrated detector whenever moves and moves a step, the data acquisition system (DAS) collection once, Computer Storage one secondary data;
(3) the hot acoustical signal of utilizing acquisition system to record is handled by Origin, obtains the curve that hot acoustical signal changes with detector position in the microwave radiation field; The result as shown in Figure 5;
As can be seen from Figure 5, along with detector away from the waveguide mouth, hot acoustical signal amplitude reduces gradually, has illustrated that the energy of microwave field is decayed gradually in the zone of surveying.
Above-described embodiment is preferred implementation of the present invention; but embodiments of the present invention are not restricted to the described embodiments; other any do not deviate from change, the modification done under spiritual essence of the present invention and the principle, substitutes, combination, simplify; all should be the substitute mode of equivalence, be included within protection scope of the present invention.
Claims (9)
1. the measuring system based on the pulsed microwave radiation field distribution of thermoacoustic effect is characterized in that comprising measured pulse microwave source, integrated detector, weak signal amplifier A, data acquisition system (DAS), function generator and computing machine; Integrated detector, weak signal amplifier A, data acquisition system (DAS) are connected successively with computing machine, and the measured pulse microwave source is arranged at the below of integrated detector, and function generator is connected with data acquisition system (DAS), computing machine respectively;
Described integrated detector 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 the detector signal line is drawn from the focused transducer tail end; The detector signal line is connected with weak signal amplifier A.
2. the measuring system of the pulsed microwave radiation field distribution based on thermoacoustic effect according to claim 1, it is characterized in that: described integrated detector and data acquisition system (DAS) are electrically connected.
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 dominant frequency of described focused transducer is 1～30MHz, and the array element diameter is 6～30mm, and focal length is 1～8cm.
4. 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, and epimere is tubulose, and the diameter of pipe is 1.5mm, pipe range 5cm.
5. the measuring system of the pulsed microwave radiation field distribution based on thermoacoustic effect according to claim 4, it is characterized in that: described coupler is the tygon coupler; The acoustic coupling medium is housed in the coupler.
6. the measuring system of the pulsed microwave radiation field distribution based on thermoacoustic effect according to claim 5, it is characterized in that: described acoustic coupling medium is water or mineral oil.
7. the measuring system of the pulsed microwave radiation field distribution based on thermoacoustic effect according to claim 1, it is characterized in that: described point sound source is that diameter is the carbon ball of 1mm; Described data acquisition system (DAS) is provided with PXI bus computer, weak signal amplifier B and data collecting card, and data collecting card is inserted on the PXI bus computer PCI slot, and weak signal amplifier B is connected the signal input part of data collecting card by the BNC line.
8. the measuring system of the pulsed microwave radiation field distribution based on thermoacoustic effect according to claim 1, it is characterized in that: described computer installation has image reconstruction software; Described integrated detector is fixed on the three-dimensional platform by support.
9. use the measuring system of each described pulsed microwave radiation field distribution based on thermoacoustic effect of claim 1～8 to measure the method that the pulsed microwave radiation field energy distributes, it is characterized in that comprising following operation steps:
(1) integrated detector is placed the pulse microwave field, make pulse microwave pass through the waveguide orientation to external radiation; Startup is based on the measuring system of the pulsed microwave radiation field distribution of thermoacoustic effect, the point by point scanning in the measured pulse microwave field of integrated detector, excitaton source excites the point sound source in the integrated detector, and point sound source absorbs energy and causes instantaneous temperature to raise, thereby stress produce hot acoustical signal;
(2) integrated detector is fixed on the support mobile integrated detector; The hot acoustical signal that point sound source produces is received by ultrasonic transducer through the transmission of the coupling medium in the integrated detector, and after amplifying through weak signal amplifier A, the hot acoustical signal by data acquisition system (DAS) collection and record each point is stored in the computing machine again; Integrated detector whenever moves and moves a step, the data acquisition system (DAS) collection once, Computer Storage one secondary data;
(3) the hot acoustical signal of utilizing acquisition system to record is handled by Origin, obtains the curve that hot acoustical signal changes with detector position in the microwave radiation field;
Excitaton source described in the step (1) is the pulse microwave generator, and the pulse microwave wavelength of pulse microwave generator is 0.01mm～1m, and pulse width τ is 1ns～1 μ s.
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