CN108896202A - A kind of temperature-detecting device and method based on ultrasonic wave under high microwave radiation environment - Google Patents
A kind of temperature-detecting device and method based on ultrasonic wave under high microwave radiation environment Download PDFInfo
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- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/22—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using measurement of acoustic effects
- G01K11/24—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using measurement of acoustic effects of the velocity of propagation of sound
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Abstract
The invention discloses a kind of temperature-detecting device and method based on ultrasonic wave under high microwave radiation environment, device mainly includes signal generator, ultrasonic transmission/reception energy converter, ultrasonic wave transmitting circuit, amplification and conditioning circuit and host computer.It is mainly as follows using step：1) tested region is determined.2) ultrasonic electrical signal of tested region is detected.3) host computer (4) receives and processes ultrasonic electrical signal, to obtain the temperature T (x, y) under high microwave radiation environment in tested region.The present invention can be to the detection of the carry out temperature of the material under industrial high radiation microwave heating condition securely and reliably, and detection device of the invention is easy to operate, easy for installation, can be measured in real time to the intracorporal temperature of chamber.
Description
Technical field
The present invention relates to the temperature detection field under high microwave radiation, specifically a kind of ultrasonic wave that is based on is in high microwave radiation
Temperature-detecting device and method under environment.
Background technique
Microwave is a kind of very strong electromagnetic wave of penetration power as a kind of body heat source, with traditional heat transfer heating mode phase
Than microwave heating can generally be accomplished inside and outside to heat together, thus be widely used in chemical, food medicinal material and medical treatment etc.
Field.But lead to the complicated variety of its temperature change due to the diversity of material itself in microwave heating process, often
There is the excessively high situation of local temperature, especially there is the possibility exploded in the industrial production, and due to the intense radiation of microwave, it is micro-
Wave heating is all in a closed heating cavity, then seeming particularly critical for the temperature monitoring of inside cavity material.
The microwave thermometry of existing relatively broad application mainly has three kinds：
1. the thermocouple microwave temp measuring method of electromagnetism interference.This method belongs to contact temperature-measuring method and can only measure chamber
The specific certain point temperature value of internal material, is unable to satisfy the monitoring in industrial production for temperature, and measurement range is small, is not suitable for
It is promoted in industrial application.
2. optical fiber temperature-measurement method.Fibre optic temperature sensor has many advantages, such as electromagnetism interference, high temperature resistant, small in size, is microwave
The monitoring of temperature provides an active path in heating process, but since product stability is poor and cost is high, limits
Extensive use in industry.
3. infrared radiation thermometer is a kind of non-contact measuring instrument table, for the measurement to different objects surface temperature, but
It is affected when thermometric by object emission rate, aerosol, low measurement accuracy, range is small.
Parameter measurements, the cores such as research temperature relevant to ultrasonic wave, distance can be converted into ultrasonic wave
Then transmitting transducer and the measurement for receiving the time of flying between energy converter are closed by the function between time and temperature that flies over
System can solve temperature value.Therefore, precision is higher under specific high microwave radiation environment, the stronger ultrasonic wave of real-time flies
Time measurement is crossed to be of great significance for ultrasonic wave thermometric.
Summary of the invention
Present invention aim to address problems of the prior art.
To realize the present invention purpose and the technical solution adopted is that such, one kind is based on ultrasonic wave in high microwave radiation ring
Temperature-detecting device under border, mainly include signal generator, ultrasonic transmission/reception energy converter, ultrasonic wave transmitting circuit, amplification with
Conditioning circuit and host computer.
The signal generator sends pulse signal to ultrasound transmitting transducer.
The ultrasonic transmission/reception energy converter mainly includes that the ultrasound transmitting transducer and ultrasonic wave receive energy converter.
After the ultrasound transmitting transducer receives the pulse signal, it is super that energy converter transmission is received to the ultrasonic wave
Sound wave mechanical signal.
The ultrasonic wave receives energy converter and the ultra sonic machinery signal received is converted to ultrasonic electrical signal signal_
1, and send the ultrasonic electrical signal signal_1 in the amplification and conditioning circuit.
The amplification and conditioning circuit carry out signal amplification and conditioning to the ultrasonic electrical signal received, and will be after conditioning
Ultrasonic electrical signal signal_2 be sent in the host computer.
The host computer receives and handles the amplified ultrasonic electrical signal, to obtain the temperature value of tested region
T(x,y)。
The host computer mainly controls the frequency for the ultra sonic machinery signal that the ultrasound transmitting transducer is sent, period
Several and amplitude.
Temperature-detecting device based on ultrasonic wave under high microwave radiation environment further includes oscillograph.
After the oscillograph receives the amplified ultrasonic electrical signal that the amplification is sent with conditioning circuit, display amplification
The waveform of ultrasonic electrical signal afterwards.
A kind of method of the temperature-detecting device of use based on ultrasonic wave under high microwave radiation environment mainly includes following
Step：
1) tested region is determined.The tested region is high radiation microwave heating cavity.
Setting the tested region has S item ultrasound flight path.The tested region is divided into N number of block of cells, wherein
The centre coordinate of g-th of block of cells is (xg,yg).By the central point (x of each blockg,yg) center as radial basis function
Point.
Further, one end of the top connection transmission wave conduit of the high radiation microwave heating cavity.The transmission waveguide
The other end connection of pipe provides the microwave source of heating source.
The microwave source of the heating source heats the high radiation microwave heating cavity by the transmission wave conduit.
The side of the high radiation microwave heating cavity has wall mouth, which is distance of center circle cavity lower end hcm, radius
The circular port of dcm.
Two opposite sides of the high radiation microwave heating cavity connect cut-off waveguide.
The cut-off waveguide prevents the high radiation microwave from leakage of the high radiation microwave heating inside cavity.
2) the ultrasonic wave telecommunications of the temperature-detecting device detection tested region based on ultrasonic wave under high microwave radiation environment
Number.
The temperature-detecting device detection high radiation microwave heating cavity based on ultrasonic wave under high microwave radiation environment
Temperature.Wherein, the amplification is fixed on the exit of the cut-off waveguide with conditioning circuit.
The ultrasound transmitting transducer extends to the high radiation microwave by lead from the cut-off waveguide and adds
At the wall mouth of hot cavity.
The ultrasonic wave reception energy converter extends to the high radiation microwave by lead from the cut-off waveguide and adds
At the wall mouth of hot cavity.
Wherein, ultrasonic wave receives energy converter and the ultra sonic machinery signal received is converted to ultrasonic electrical signal and is sent into and amplifies
With progress signal amplification in conditioning circuit.Amplified ultrasonic electrical signal is sent into the host computer by amplification and conditioning circuit
In.
3) host computer receives and processes ultrasonic electrical signal, to obtain under high microwave radiation environment in tested region
Temperature T (x, y).
The method that host computer constructs the temperature of material in tested region under high microwave radiation environment is that improved Gauss is radial
Basic function reconstruction of temperature field algorithm.
The key step that host computer constructs the temperature of material in tested region under high microwave radiation environment is as follows：
3.1) algorithm for reconstructing based on tight branch Gaussian radial basis function, determines the radial basis function of the tested region
(x,y).Radial basis function(x, y) is as follows：
In formula, θ is the form parameter of radial basis function.X is abscissa variable.Y is ordinate variable.xgIt is small for g-th
The center abscissa of block.ygFor the center ordinate of g-th of block of cells.R is function point (x, y) to central point (xg,yg) distance
With the ratio of tight branch radius.Ratio r is as follows：
In formula, R is tight branch radius.(xg,yg) be g-th of block of cells centre coordinate.
3.2) the ultrasonic spread speed inverse matrix a in the medium of building.Spread speed inverse matrix a is as follows：
In formula, εgIt is velocity of sound inverse distribution parameter.G is arbitrarily small block.N is block of cells sum.(x, y) is radial base
Function.
3.3) flight time t of the ultrasound on kth aerial flight path is calculatedk.Flight time tkAs follows：
In formula, a is ultrasonic propagation velocity inverse matrix.lkFor the effective propagation path of kth item.S is that ultrasonic flight path is total
Number.(x, y) is radial basis function.εgIt is velocity of sound inverse distribution parameter.G is arbitrarily small block.N is block of cells sum.akgFor
The ultrasonic propagation velocity of the effective propagation path of kth item of g-th of block is reciprocal.
Wherein, the ultrasonic propagation velocity inverse a of g-th of block of cells of the effective propagation path of kth itemkgAs follows：
In formula, lkFor the effective propagation path of kth item.S is ultrasonic flight path sum.(x, y) is radial basis function.
3.4) by flight time tkIt is written as matrix form, i.e.,：
T=A ε. (6)
In formula, flight time matrix t=(t1,t2,...,tS)T。
A is ultrasonic propagation velocity inverse matrix.A=(akg), k=1 ..., S, g=1 ..., N.
ε is velocity of sound inverse distribution parameter matrix.ε=(ε1,ε2,...,εN)T.G is arbitrarily small block.N is that block of cells is total
Number.S is ultrasonic flight path sum.
Velocity of sound inverse distribution parameter matrix ε is as follows：
ε=(ATA)-1ATt。 (7)
In formula, t is flight time matrix.A is ultrasonic propagation velocity inverse matrix.
3.5) velocity of sound inverse distribution matrix ε is substituted into formula 3, obtains ultrasound spread speed inverse matrix a in the medium.
By ultrasound in the medium spread speed inverse matrix a substitute into formula 8 in, be calculated tested region temperature T (x,
y)。
Functional relation between spread speed c and temperature T is as follows：
In formula, H is ideal gas constant.M is gas molecule quality.γ is specific heat ratio.T is temperature.Q is heat.
Temperature T (x, y) is as follows：
In formula, Q is heat.A is ultrasound spread speed inverse matrix in the medium.
The solution have the advantages that unquestionable.The present invention can be to the material under industrial high radiation microwave heating condition
The detection of safe and reliable carry out temperature, detection device of the invention is easy to operate, easy for installation, can be to the intracorporal temperature of chamber
It is measured in real time.
Detailed description of the invention
Fig. 1 is that temperature measures scheme of installation；
Fig. 2 is ultrasonic transducer distribution and ultrasonic wave path plan view；
Fig. 3 is temperature instrumentation plan；
Fig. 4 is amplification and conditioning circuit schematic diagram；
In figure：Signal generator 1, ultrasonic transmission/reception energy converter 2, amplification and conditioning circuit 3, host computer 4, ultrasonic wave emit
Energy converter 21, ultrasonic wave receive energy converter 22, oscillograph 5, high radiation microwave heating cavity 6, transmission wave conduit 7, heating source
Microwave source 8 and cut-off waveguide 9.
Specific embodiment
Below with reference to embodiment, the invention will be further described, but should not be construed the above-mentioned subject area of the present invention only
It is limited to following embodiments.Without departing from the idea case in the present invention described above, according to ordinary skill knowledge and used
With means, various replacements and change are made, should all include within the scope of the present invention.
Embodiment 1：
Referring to Fig. 1 to Fig. 4, a kind of temperature-detecting device based on ultrasonic wave under high microwave radiation environment mainly includes
Signal generator 1, ultrasonic transmission/reception energy converter 2, ultrasonic wave transmitting circuit 3, amplification and conditioning circuit 3 and host computer 4.
The signal generator 1 sends pulse signal to ultrasound transmitting transducer 21.
The ultrasonic transmission/reception energy converter 2 mainly includes that the ultrasound transmitting transducer 21 and ultrasonic wave receive energy converter
22。
After the ultrasound transmitting transducer 21 receives the pulse signal, energy converter 22 is received to the ultrasonic wave and is sent out
Send ultra sonic machinery signal.
The ultrasonic wave receives energy converter 22 and the ultra sonic machinery signal received is converted to ultrasonic electrical signal
Signal_1, and send the ultrasonic electrical signal signal_1 in the amplification and conditioning circuit 3.
The amplification carries out signal amplification and conditioning to the ultrasonic electrical signal signal_1 received with conditioning circuit 3,
And it sends the ultrasonic electrical signal signal_2 after conditioning in the host computer 4.
The amplification and the circuit structure of conditioning circuit are：
Ultrasonic electrical signal signal_1 enters amplification and conditioning circuit from one end of capacitor C2.The other end of capacitor C2 according to
The port Inverting Input2 of secondary series resistance R2 and TL074I.
The port the Output2 series resistance R1 of TL074I is followed by the port Inverting Input2.The Output2 of TL074I
Port is sequentially connected in series the port Inverting Input1 that resistance R3 and capacitor C1 is followed by TL074I.The end Output2 of TL074I
Mouth is sequentially connected in series the port Output1 that resistance R3, capacitor C1 and resistance R4 are followed by TL074I.
Ultrasonic electrical signal signal_2 after the port the Output1 output conditioning of TL074I.
The port Non-inverting Input1 of TL074I is grounded.
The V of TL074IccIt is grounded after the series capacitance C3 of+port.
The V of TL074IccIt is grounded after the series capacitance C4 of port.
The port Non-inverting Input2 of TL074I is grounded.
I indicates that component level is technical grade in TL074I.TL07_ series is TL08_ system in JFET input operational amplifier
The low noise of column, low input bias current, offset current, and the version with quick voltage conversion rate.
TL074 is a kind of input operational amplifier for being furnished with high voltage bipolar transistor in monolithic integrated optical circuit, is had
The common trait of above-mentioned TL07_ series.
The temperature range that TL074I can be born is -40 DEG C~+150 DEG C.
The host computer 4 receives and handles the amplified ultrasonic electrical signal, to obtain the temperature of tested region
Value T (x, y).
The host computer 4 mainly control the ultra sonic machinery signal that the ultrasound transmitting transducer 21 is sent frequency,
Periodicity and amplitude.
Temperature-detecting device based on ultrasonic wave under high microwave radiation environment further includes oscillograph 5.
After the oscillograph 5 receives the amplified ultrasonic electrical signal that the amplification is sent with conditioning circuit 3, display is put
The waveform of ultrasonic electrical signal after big.
Further, the temperature-detecting device based on ultrasonic wave under high microwave radiation environment radiates microwave heating cavity in height
It is used in 6, wherein further including transmission wave conduit 7, providing the microwave source 8 and cut-off waveguide 9 of heating source.
Embodiment 2：
A kind of method of the temperature-detecting device of use based on ultrasonic wave under high microwave radiation environment mainly includes following
Step：
1) tested region is determined.The tested region is high radiation microwave heating cavity 6.
Setting the tested region has S item ultrasound flight path.The tested region is divided into N number of block of cells, wherein
The centre coordinate of g-th of block of cells is (xg,yg).By the central point (x of each blockg,yg) center as radial basis function
Point.
Further, one end of the top connection transmission wave conduit 7 of the high radiation microwave heating cavity 6.The transmission wave
The other end connection of conduit provides the microwave source 8 of heating source.
The microwave source 8 of the heating source adds the high radiation microwave heating cavity 6 by the transmission wave conduit 7
Heat.
The side of the high radiation microwave heating cavity 6 has wall mouth, which is distance of center circle cavity lower end hcm, radius
The circular port of dcm, the i.e. distance of the bottom of the wall mouth and inside cavity are h, and the radius of wall mouth is d.H=17cm, d=0.8cm.
Two opposite sides of the high radiation microwave heating cavity connect cut-off waveguide 9.
The cut-off waveguide 9 prevents the high radiation microwave from leakage inside the high radiation microwave heating cavity 6.
Microwave in cut-off waveguide 9 is with e-αhForm decaying, wherein α is attenuation coefficient, and size is
(L in formulacThe cut-off wave number being off in waveguide, L are off the propagation wave-numbers in waveguide), h is off the length of waveguide 9
Degree establishes the length of cut-off waveguide 9 according to the size of the aperture on 7 wall of cavity, and the cut-off waveguide is special by Chongqing west weight
Kind Aluminum Co., Ltd produces, and can count to detect to reach by leakage and leak energy attenuation standard, and the leakage energy analyzer is prosperous using Taiwan Road
Company electromagnetic field of high frequency analyzer EMF-839；Load onto ultrasound transmitting transducer battle array respectively in cut-off waveguide 9 at the same time
Column and ultrasonic wave receive transducer array, and transmitting-receiving energy converter model is respectively 40LT-16 and 40LR-16.It is ultrasonic in order to prevent
Stronger interference is generated between wave transducer and the cut-off waveguide of aluminum, changes ultrasonic wave transmitting and reception when testing measurement
Coating of wax is coated on the surface of energy device, to play a part of to be dielectrically separated from.
Due to strong absorbent of the microwave in water body, wet towel can be rolled on cut-off waveguide in actual operation, with
It meets the standard of zero tolerance.
As shown in Fig. 2, being ultrasound transmitting transducer T1-T7Array and ultrasonic wave receive energy converter R1-R7The distribution of array
And ultrasonic wave path figure.
2) the ultrasonic wave telecommunications of the temperature-detecting device detection tested region based on ultrasonic wave under high microwave radiation environment
Number.
The temperature-detecting device detection high radiation microwave heating cavity based on ultrasonic wave under high microwave radiation environment
Temperature.Wherein, the amplification is fixed on the exit of the cut-off waveguide with conditioning circuit 3.
The ultrasound transmitting transducer 21 extends to the high radiation microwave by lead from the cut-off waveguide
At the wall mouth of heating cavity.
The ultrasonic wave receives energy converter 22 and extends to the high radiation microwave from the cut-off waveguide by lead
At the wall mouth of heating cavity.
Wherein, the ultra sonic machinery signal received is converted to ultrasonic electrical signal feeding and put by ultrasonic wave reception energy converter 22
Greatly in conditioning circuit 3 carry out signal amplification.Amplified ultrasonic electrical signal is sent into described upper by amplification with conditioning circuit 3
In machine 4.
3) host computer 4 receives and processes ultrasonic electrical signal, to obtain tested region under high microwave radiation environment
Interior temperature T (x, y).
The method that host computer 4 constructs the temperature of material in tested region under high microwave radiation environment is that improved Gauss is radial
Basic function reconstruction of temperature field algorithm.
The key step that host computer 4 constructs the temperature of material in tested region under high microwave radiation environment is as follows：
3.1) algorithm for reconstructing based on tight branch Gaussian radial basis function, determines the radial basis function of the tested region
(x,y).Radial basis function(x, y) is as follows：
In formula, θ is the form parameter of radial basis function.X is abscissa variable.Y is ordinate variable.xgIt is small for g-th
The center abscissa of block.ygFor the center ordinate of g-th of block of cells.R is function point x, y to central point (xg,yg) distance and
The ratio of tight branch radius.Ratio r is as follows：
In formula, R is tight branch radius.(xg,yg) be g-th of block of cells centre coordinate.
3.2) the ultrasonic spread speed inverse matrix a in the medium of building.Spread speed inverse matrix a is as follows：
In formula, εgIt is velocity of sound inverse distribution parameter.G is arbitrarily small block.N is block of cells sum.(x, y) is radial base
Function.
3.3) flight time t of the ultrasound on kth aerial flight path is calculatedk.Flight time tkAs follows：
In formula, a is ultrasonic propagation velocity inverse matrix.lkFor the effective propagation path of kth item.S is that ultrasonic flight path is total
Number.(x, y) is radial basis function.εgIt is velocity of sound inverse distribution parameter.G is arbitrarily small block.N is block of cells sum.akgFor
The ultrasonic propagation velocity of the effective propagation path of kth item of g-th of block is reciprocal.
Wherein, the ultrasonic propagation velocity inverse a of g-th of block of cells of the effective propagation path of kth itemkgAs follows：
In formula, lkFor the effective propagation path of kth item.S is ultrasonic flight path sum.(x, y) is radial basis function.
3.4) by flight time tkIt is written as matrix form, i.e.,：
T=A ε. (6)
In formula, flight time matrix t=(t1,t2,...,tS)T。
A is ultrasonic propagation velocity inverse matrix.A=(akg), k=1 ..., S, g=1 ..., N.
ε is velocity of sound inverse distribution parameter matrix.ε=(ε1,ε2,...,εN)T.G is arbitrarily small block.N is that block of cells is total
Number.S is ultrasonic flight path sum.
Velocity of sound inverse distribution parameter matrix ε is as follows：
ε=(ATA)-1ATt。 (7)
In formula, t is flight time matrix.A is ultrasonic propagation velocity inverse matrix.Subscript T is transposition symbol, and subscript -1 is
Inverse matrix symbol.
3.5) velocity of sound inverse distribution matrix ε is substituted into formula 3, obtains ultrasound spread speed inverse matrix a in the medium.
By ultrasound in the medium spread speed inverse matrix a substitute into formula 8 in, be calculated tested region temperature T (x,
y)。
Functional relation between spread speed c and temperature T is as follows：
In formula, H is ideal gas constant.M is gas molecule quality.γ is specific heat ratio.T is temperature.Q is heat.
Temperature T (x, y) is as follows：
In formula, Q is heat.A is ultrasound spread speed inverse matrix in the medium.
Claims (8)
1. a kind of temperature-detecting device based on ultrasonic wave under high microwave radiation environment, it is characterised in that：It mainly include signal
Generator (1), ultrasonic transmission/reception energy converter (2) and amplification and conditioning circuit (3) and host computer (4).
The signal generator (1) sends pulse signal to ultrasound transmitting transducer (21)；
The ultrasonic transmission/reception energy converter (2) mainly includes that the ultrasound transmitting transducer (21) and ultrasonic wave receive energy converter
(22)；
After the ultrasound transmitting transducer (21) receives the pulse signal, energy converter (22) are received to the ultrasonic wave and are sent out
Send ultra sonic machinery signal；
The ultrasonic wave receives energy converter (22) and the ultra sonic machinery signal received is converted to ultrasonic electrical signal signal_
1, and send the ultrasonic electrical signal signal_1 in the amplification and conditioning circuit (3)；
The amplification carries out signal amplification and conditioning to the ultrasonic electrical signal signal_1 received with conditioning circuit (3), and
It sends the ultrasonic electrical signal signal_2 after conditioning in the host computer (4)；
The host computer (4) receives and handles the amplified ultrasonic electrical signal, to obtain the temperature value T of tested region
(x,y)。
2. a kind of temperature-detecting device based on ultrasonic wave under high microwave radiation environment according to claim 1, special
Sign is：The host computer (4) mainly controls the frequency of the ultra sonic machinery signal of the ultrasound transmitting transducer (21) transmission
Rate, periodicity and amplitude.
3. a kind of temperature-detecting device based on ultrasonic wave under high microwave radiation environment according to claim 1, special
Sign is：It further include oscillograph (5)；
After the oscillograph (5) receives the amplified ultrasonic electrical signal that the amplification is sent with conditioning circuit (3), display is put
The waveform of ultrasonic electrical signal after big.
4. a kind of side using the temperature-detecting device described in claims 1 to 33 based on ultrasonic wave under high microwave radiation environment
Method, which is characterized in that mainly include the following steps that：
1) tested region is determined；The tested region is high radiation microwave heating cavity (6)；
Setting the tested region has S item ultrasound flight path；The tested region is divided into N number of block of cells, wherein g-th
The centre coordinate of block of cells is (xg,yg)；By the central point (x of each blockg,yg) central point as radial basis function；
2) ultrasonic electrical signal of the temperature-detecting device detection tested region based on ultrasonic wave under high microwave radiation environment；
Wherein, ultrasonic wave receives energy converter (22) and the ultra sonic machinery signal received is converted to ultrasonic electrical signal and is sent into and amplifies
With progress signal amplification in conditioning circuit (3)；Amplified ultrasonic electrical signal is sent on described by amplification with conditioning circuit (3)
In position machine (4)；
3) host computer (4) receives and processes ultrasonic electrical signal, to obtain under high microwave radiation environment in tested region
Temperature T (x, y).
5. a kind of temperature-detecting device of the use according to claim 4 based on ultrasonic wave under high microwave radiation environment
Method, it is characterised in that：One end of top connection transmission wave conduit (7) of high radiation microwave heating cavity (6)；The biography
The other end connection of defeated waveguide provides the microwave source (8) of heating source；
The microwave source (8) of the heating source carries out high radiation microwave heating cavity (6) by the transmission wave conduit (7)
Heating；
The side of high radiation microwave heating cavity (6) has wall mouth；
Two opposite sides of the high radiation microwave heating cavity connect cut-off waveguide (9)；
The high radiation microwave from leakage that the cut-off waveguide (9) prevents high radiation microwave heating cavity (6) internal.
6. a kind of temperature-detecting device of the use according to claim 4 based on ultrasonic wave under high microwave radiation environment
Method, it is characterised in that：The wall mouth is distance of center circle cavity lower end hcm, the circular port of radius dcm.
7. a kind of temperature-detecting device of the use according to claim 4 based on ultrasonic wave under high microwave radiation environment
Method, it is characterised in that：The temperature-detecting device detection high radiation microwave based on ultrasonic wave under high microwave radiation environment
The temperature of heating cavity；Wherein, the amplification is fixed on the exit of the cut-off waveguide with conditioning circuit (3)；
The ultrasound transmitting transducer (21) extends to the high radiation microwave by lead from the cut-off waveguide and adds
At the wall mouth of hot cavity；
Ultrasonic wave reception energy converter (22) extends to the high radiation microwave by lead from the cut-off waveguide and adds
At the wall mouth of hot cavity.
8. a kind of temperature-detecting device of the use according to claim 4 based on ultrasonic wave under high microwave radiation environment
Method, it is characterised in that：The method that host computer (4) constructs the temperature of material in tested region under high microwave radiation environment is to improve
Gaussian radial basis function reconstruction of temperature field algorithm；
The key step that host computer (4) constructs the temperature of material in tested region under high microwave radiation environment is as follows：
1) algorithm for reconstructing based on tight branch Gaussian radial basis function, determines the radial basis function of the tested regionDiameter
To basic functionAs follows：
In formula, θ is the form parameter of radial basis function；X is abscissa variable；Y is ordinate variable；xgFor g-th block of cells
Center abscissa；ygFor the center ordinate of g-th of block of cells；R is function point (x, y) to central point (xg,yg) distance and tight branch
The ratio of radius；Ratio r is as follows：
In formula, R is tight branch radius；(xg,yg) be g-th of block of cells centre coordinate；X is abscissa variable；Y is ordinate change
Amount；
2) the ultrasonic spread speed inverse matrix a in the medium of building；Spread speed inverse matrix a is as follows：
In formula, εgIt is velocity of sound inverse distribution parameter；G is arbitrarily small block；N is block of cells sum；For radial basis function；
3) flight time t of the ultrasound on kth aerial flight path is calculatedk；Flight time tkAs follows：
In formula, a is ultrasonic propagation velocity inverse matrix；lkFor the effective propagation path of kth item；S is ultrasonic flight path sum；For radial basis function；εgIt is velocity of sound inverse distribution parameter；G is arbitrarily small block；N is block of cells sum；akgFor g
The ultrasonic propagation velocity of the effective propagation path of kth item of a block is reciprocal；
Wherein, the ultrasonic propagation velocity inverse a of g-th of block of cells of the effective propagation path of kth itemkgAs follows：
In formula, lkFor the effective propagation path of kth item；S is ultrasonic flight path sum；For radial basis function；
4) by flight time tkIt is written as matrix form, i.e.,：
T=A ε； (6)
In formula, flight time matrix t=(t1,t2,...,tS)T；
A is ultrasonic propagation velocity inverse matrix；A=(akg), k=1 ..., S, g=1 ..., N；
ε is velocity of sound inverse distribution parameter matrix；ε=(ε1,ε2,...,εN)T；G is arbitrarily small block；N is block of cells sum；S is
Ultrasonic flight path sum；
Velocity of sound inverse distribution parameter matrix ε is as follows：
ε=(ATA)-1ATt； (7)
In formula, t is flight time matrix；A is ultrasonic propagation velocity inverse matrix；
5) velocity of sound inverse distribution matrix ε is substituted into formula 3, obtains ultrasound spread speed inverse matrix a in the medium；
By ultrasound, spread speed inverse matrix a is substituted into formula 8 in the medium, and the temperature T (x, y) of tested region is calculated；
Functional relation between spread speed c and temperature T is as follows：
In formula, H is ideal gas constant；M is gas molecule quality；γ is specific heat ratio；T is temperature；Q is heat；
Temperature T (x, y) is as follows：
In formula, Q is heat；A is ultrasound spread speed inverse matrix in the medium.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN112729594B (en) * | 2021-01-22 | 2021-11-02 | 北京航空航天大学 | Reconstruction method for ultrasonic measured temperature field |
| WO2023087176A1 (en) * | 2021-11-17 | 2023-05-25 | 华为技术有限公司 | Temperature measurement system and method |
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