Three-dimensional sound velocity method temperature measurement system

Abstract

The utility model discloses a three-dimensional sound velocity method temperature measurement system. The system comprises a computer, a power amplifier, a relay, a three-dimensional rack, a loudspeaker, a microphone and a signal analyzer. According to the utility model, the overall temperature of a gas medium in a three-dimensional space is measured by using a non-contact sound velocity method temperature measurement principle, and a more comprehensive contribution is made to temperature monitoring of a key area of a hearth; according to the utility model, mature devices such as the microphone and the loudspeaker are utilized, and the measurement sequence is controlled through the relay, so that the measurement speed and efficiency are improved; interference to the to-be-measured area in the measurement process is reduced to the maximum extent, and the measurement precision is improved; the influence of factors such as measurement background noise, sound wave attenuation and reverberation is considered, a sound source signal and a time delay estimation method are selected according to actual conditions, and the sound wave flying time measurement precision and the three-dimensional temperature field reconstruction precision are improved; the three-dimensional sound velocity method temperature measurement can be expanded to measurement of three-dimensional to-be-measured areas in other shapes except a cube, and has good applicability.

Description

Technical Field

[0001] The utility model belongs to the technical field of non-contact measurement, and specifically relates to a three-dimensional sound velocity method temperature measurement system which utilizes a sound signal received by a microphone to perform cross-correlation analysis to obtain the sound wave flight time. Background Art

[0002] According to the temperature measurement principle of the sound velocity method and the dependence of sound velocity on temperature, the acoustic wave flight time (TOF) between the microphone pairs can be obtained in the target region (ROI), and then the temperature distribution within the ROI can be obtained by the reconstruction algorithm.

[0003] In theory, the speed of sound depends on the gas temperature:

[0004]

[0005] Where: c is the speed of sound (m / s), γ is the adiabatic gas constant, R is the molar gas constant, R = 8.314 J / (mol·K), M is the average molecular weight of the gas (g / mol), T is the absolute temperature (K), and Z is the gas constant determined by the composition and properties of the gas.

[0006] The TOF is obtained by integrating along a single acoustic path l:

[0007]

[0008] Where f is the reciprocal of the speed of sound at a specific point in the ROI, s / m.

[0009] Similarly, in multiple sound paths and gridded areas to be measured, there are:

[0010]

[0011] Where l ij is the length of the i-th sound path in the j-th grid. j It is the inverse of the speed of sound of the jth grid in ROI. i is the TOF of the ith sound path. M is the number of sound paths, N is the number of ROI grids. A is the coefficient matrix, b is the TOF matrix, and x is the inverse sound velocity matrix.

[0012] The coefficient matrix A can be calculated based on the specific size of the area to be measured and the specific arrangement of the loudspeaker and microphone. The TOF matrix b can be obtained by estimating the time delay between the time difference between the sound wave signal and the microphone. Then, the linear equations are solved using the temperature field reconstruction algorithm to obtain the inverse sound speed matrix x. Finally, the relationship between the sound speed and the gas temperature is substituted to reconstruct the grid average temperature of the area to be measured.

[0013] The existing technology used in furnace temperature measurement is usually to use the contact temperature measurement method to measure the temperature of key points, as well as the optimization algorithm and application scenario expansion of the two-dimensional acoustic wave temperature measurement technology.

[0014] The existing contact temperature measurement method and two-dimensional sound velocity temperature measurement technology still have certain defects, including:

[0015] 1. The contact temperature measurement method affects and participates in the heat and mass exchange process in the furnace, interferes with the normal operation of the furnace, and reduces the measurement accuracy;

[0016] 2. The contact temperature measuring element based on the principle of thermal balance has poor measurement immediacy in complex and changing environments;

[0017] 3. The service life of contact temperature measuring elements is reduced in harsh environments and their reliability is reduced;

[0018] 4. The current two-dimensional acoustic temperature measurement system still faces problems such as small amount of reconstruction data, low image resolution, and reconstruction accuracy that needs to be improved in practical applications;

[0019] 5. The current two-dimensional acoustic temperature measurement system generally uses a pneumatic sound source with sharp autocorrelation characteristics and easy to detect, but it has the same probability distribution as the background noise of the furnace, so that the background noise affects the measurement process of the acoustic wave flight time, resulting in inaccurate temperature measurement of the area to be measured;

[0020] 6. The current two-dimensional sound velocity method temperature measurement technology can only measure the two-dimensional cross-sectional temperature field, and cannot accurately measure the three-dimensional spatial temperature field;

[0021] In summary, a new three-dimensional sound velocity temperature measurement system and operation method are urgently needed. Summary of the invention

[0022] In order to solve the problems existing in the above-mentioned prior art, the purpose of the utility model is to provide a three-dimensional sound velocity method temperature measurement system to solve one or more of the technical problems that the existing contact temperature measurement method affects the heat and mass exchange process in the furnace, the contact temperature measurement element based on the principle of thermal balance has poor measurement immediacy in complex and changing environments, the service life and reliability of the contact temperature measurement element decrease in harsh environments, the two-dimensional acoustic temperature measurement reconstruction data volume is small and the resolution is low, background noise, sound wave attenuation, spatial reverberation and other factors reduce the temperature measurement accuracy of the sound velocity method, and the high-precision real-time monitoring of the three-dimensional temperature field of the furnace is insufficient. The utility model uses the non-contact sound velocity method temperature measurement principle to measure the overall temperature of the gas medium in the three-dimensional space, improves the reconstruction data volume and resolution, and makes a more comprehensive monitoring of the temperature in the three-dimensional area to be measured.

[0023] In order to achieve the above purpose, the technical solution of the utility model is:

[0024] A three-dimensional sound velocity method temperature measurement system, comprising a computer 1, a power amplifier 2, a relay 3, a three-dimensional stand 4, a speaker 5, a microphone 6 and a signal analyzer 7;

[0025] The analog signal output end of the computer 1 is connected to the signal input end of the power amplifier 2, the signal output end of the power amplifier 2 is connected to the signal input end of the relay 3, the signal output end of the relay 3 is connected to the input end of the speaker 5, the output end of the speaker 5 is connected to the signal receiving end of the microphone 6, the signal output end of the microphone 6 is connected to the input end of the signal analyzer 7, and the signal output end of the signal analyzer 7 is connected to the USB port of the computer 1; the speakers 5 and microphones 6 are multiple groups, and each group of speakers 5 and microphones 6 is located at the same position on the three-dimensional stand 4. The measurement target of the three-dimensional sound velocity method temperature measurement system is the gas temperature in the three-dimensional area to be measured surrounded by the three-dimensional stand 4;

[0026] The sound card of the computer 1 converts the audio file of the preset sweep frequency signal into an analog signal; the analog signal is first amplified by the power amplifier 2, and then reaches the designated speaker 5 through the relay 3 to be converted into a sound wave signal for output; the microphone 6 receives the sound wave signal and converts it into an electrical signal and transmits it to the signal analyzer 7 for adjustment and collection, and then the collected data is sent to the computer 1 for processing: the sound wave flight time required for the sound wave to reach the microphone 6 from the designated speaker 5 is obtained through cross-correlation analysis; after completing multiple rounds of sound wave flight time measurement, the sound wave flight time is known, and the positional relationship between the three-dimensional platform 4 and the speaker 5 and the microphone 6 is known, and the three-dimensional temperature field of the gas in the three-dimensional space surrounded by the three-dimensional platform 4 is reconstructed by the least squares QR decomposition (LSQR) method.

[0027] The loudspeaker 5 and the microphone 6 as non-contact measuring devices are located on the three-dimensional platform 4 outside the three-dimensional area to be measured, and do not interfere with the heat and mass exchange in the three-dimensional area to be measured.

[0028] Preferably, installation sites are set at the end points and midpoints of each side of the three-dimensional platform 4, with a total of 20 installation sites for installing 20 speakers 5 and 20 microphones 6; on the installation sites of the three-dimensional platform 4, a single speaker 5 and microphone 6 are installed adjacent to each other at the same position, and it is approximately considered that the two are in the same position.

[0029] Preferably, the relay 3 is a multi-channel serial port relay, which controls the on and off of the circuit in the temperature measurement system to control multiple speakers 5 to emit corresponding swept frequency sound wave signals in sequence; the measurement sequence is controlled by the relay 3, which improves the speed and efficiency of the measurement.

[0030] Preferably, the speaker 5 is an electrodynamic sound source, which converts the input analog signal into a sound wave signal and outputs it.

[0031] Preferably, the microphone 6 is a non-directional measurement microphone. During the measurement process, the multiple microphones 6 remain turned on and convert the received sound signals into electrical signals, which are then transmitted to the signal analyzer 7 for adjustment and collection.

[0032] Preferably, the signal analyzer 7 integrates signal conditioning and signal collection functions, and its multi-channel sampling channels realize multi-channel continuous signal acquisition of digitized sound waves and support subsequent channel expansion. All data collected by the signal analyzer 7 are finally transmitted to the computer 1 for storage, calculation and analysis.

[0033] Preferably, the three-dimensional platform 4 is a cube platform.

[0034] The three-dimensional temperature field sound velocity measurement method of the three-dimensional sound velocity temperature measurement system is based on the sound velocity temperature measurement principle, based on the dependence of sound velocity on temperature, to obtain the sound wave flight time of the sound wave propagating inside the three-dimensional test area in the target area; specifically, there are multiple speaker 5 and microphone 6 installation points on the three-dimensional platform 4, when the connection line between two installation points is located inside the three-dimensional test area rather than on the surface of the three-dimensional platform, the sound wave flight time between the two installation points is measured, thereby multiple sound wave flight times need to be measured;

[0035] The three-dimensional sound velocity method temperature measurement system converts the audio file of the preset sweep frequency signal into an analog signal through the sound card of the computer 1; due to the attenuation of the sound wave, in order to ensure the strength of the sound signal when it reaches the microphone 6, the analog signal is amplified by the power amplifier 2, and then the relay 3 sequentially controls multiple speakers 5 to convert the analog signal output by the computer 1 into a sound wave signal for transmission;

[0036] After the relay 3 controls a single speaker 5 to transmit a sound wave signal, multiple microphones 6 work throughout the process, and convert the received multi-channel sound signals into electrical signals and transmit them to the signal analyzer 7 for adjustment and collection, and finally transmit them to the computer 1 for storage and cross-correlation analysis. Specifically, the microphone 6 installed adjacent to the designated speaker 5 on the three-dimensional platform 4 first receives the sound signal emitted by the designated speaker 5, and then the other microphones 6 away from the designated speaker 5 successively receive the sound signal emitted by the designated speaker 5. At this time, the signal received by the microphone 6 adjacent to the designated speaker 5 and the signal received by the other microphones 6 are cross-correlatedly analyzed to obtain the sound wave flight time of the sound signal propagating from the microphone 6 adjacent to the designated speaker 5 to the other microphones 6; therefore, after the relay 3 controls the operation of different speakers 5 in turn, the computer 1 finally obtains the required multiple sound wave flight times;

[0037] Based on the measured multiple sound wave flight times and the positional relationship between the three-dimensional platform 4 and the speaker 5 and the microphone 6, the gas temperature in the three-dimensional space surrounded by the three-dimensional platform 4 is calculated by the least squares QR decomposition (LSQR) method, and then the three-dimensional temperature field of the gas in the three-dimensional space is obtained.

[0038] Compared with the conventional two-dimensional furnace acoustic temperature measurement system, the three-dimensional sound velocity method temperature measurement system in the utility model only needs to change the positions of the two-dimensional microphone and the loudspeaker on the basis of the original two-dimensional furnace acoustic temperature measurement system, and add several microphones and loudspeakers. These devices themselves have simple structures, low prices, and stable performance. Therefore, the three-dimensional sound velocity method temperature measurement system is expected to achieve significant energy saving and economic benefits, and can achieve the following beneficial effects:

[0039] (1) The utility model uses the non-contact sound velocity method to measure the overall temperature of the gas medium in three-dimensional space, thereby improving the amount and resolution of reconstructed data and making more comprehensive monitoring of the temperature of key areas of the furnace.

[0040] (2) The utility model utilizes mature equipment and processes such as microphones and loudspeakers, and measures the acoustic wave transit time on multiple acoustic paths in the area to be measured in sequence through relay control, thereby improving the speed and efficiency of measurement.

[0041] (3) The utility model only builds a stand outside the three-dimensional test area to install the microphone and the loudspeaker, and the measuring element does not contact the flow field in the three-dimensional test area, thereby minimizing the interference of the measurement process on the test area and improving the measurement accuracy.

[0042] (4) The utility model takes into account the influence of factors such as measurement background noise, sound wave attenuation, and reverberation, selects electric sound source and linear sweep signal as sound source signal according to actual conditions, selects cross-correlation analysis as time delay estimation method, and selects least squares QR decomposition (LSQR) method as temperature field reconstruction algorithm, thereby improving the overall sound wave flight time measurement accuracy and the final three-dimensional temperature field reconstruction accuracy.

[0043] (5) The three-dimensional sound velocity method of temperature measurement in the present invention can be extended to the measurement and analysis of gas temperature in three-dimensional test areas of other shapes other than cubes. It only requires changing the shape and size of the three-dimensional test stand and the number and arrangement of microphones and loudspeakers on the three-dimensional test stand, which has good applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 It is a structural schematic diagram of the utility model system. DETAILED DESCRIPTION

[0045] In order to more clearly understand the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0046] like Figure 1 As shown, the utility model is a three-dimensional sound velocity method temperature measurement system, comprising a computer 1, a power amplifier 2, a relay 3, a three-dimensional stand 4, a speaker 5, a microphone 6 and a signal analyzer 7; the analog signal output end of the computer 1 is connected to the signal input end of the power amplifier 2, the signal output end of the power amplifier 2 is connected to the signal input end of the relay 3, the signal output end of the relay 3 is connected to the input end of the speaker 5, the output end of the speaker 5 is connected to the signal receiving end of the microphone 6, the signal output end of the microphone 6 is connected to the input end of the signal analyzer 7, and the signal output end of the signal analyzer 7 is connected to the USB port of the computer 1; the speakers 5 and the microphones 6 are multiple groups, and each group of speakers 5 and microphones 6 is located at the same position on the three-dimensional stand 4. The measurement target of the three-dimensional sound velocity method temperature measurement system is the gas temperature in the three-dimensional area to be measured surrounded by the three-dimensional stand 4;

[0047] The sound card of the computer 1 converts the audio file of the preset sweep frequency signal into an analog signal; the analog signal is first amplified by the power amplifier 2, and then reaches the designated speaker 5 through the relay 3 to be converted into a sound wave signal for output; the microphone 6 receives the sound wave signal and converts it into an electrical signal and transmits it to the signal analyzer 7 for adjustment and collection, and then the collected data is sent to the computer 1 for processing: the sound wave flight time required for the sound wave to reach the microphone 6 from the designated speaker 5 is obtained through cross-correlation analysis; after completing multiple rounds of sound wave flight time measurement, the sound wave flight time is known, and the positional relationship between the three-dimensional platform 4 and the speaker 5 and the microphone 6 is known, and the three-dimensional temperature field of the gas in the three-dimensional space surrounded by the three-dimensional platform 4 is reconstructed by the least squares QR decomposition (LSQR) method.

[0048] The loudspeaker 5 and the microphone 6 as non-contact measuring devices in the system of the utility model are located on the three-dimensional stand 4 outside the three-dimensional area to be measured, and do not interfere with the heat and mass exchange in the three-dimensional area to be measured.

[0049] As a preferred embodiment of the utility model, installation sites are set at the endpoints and midpoints of each side of the three-dimensional platform 4, and a total of 20 installation sites are set for installing 20 speakers 5 and 20 microphones 6. The more sensor installation sites there are, the more sufficient the measurement data is, and the better the reconstruction performance of the sound velocity method is. However, in actual engineering applications, in order to ensure structural strength and reliability, it is not advisable to modify too many installation sites on industrial combustion equipment. In order to balance the reconstruction performance of the sound velocity method and actual engineering needs, the endpoints and midpoints of each side of the three-dimensional platform 4 are set as installation sites, so that the temperature measurement data of the sound velocity method in the three-dimensional test area is evenly distributed, while avoiding the problem of missing measurement data at the corners and edges of the three-dimensional test area. At the installation site of the three-dimensional platform 4, a single speaker 5 and microphone 6 are installed adjacent to each other at the same position, and it is approximately considered that the two are in the same position.

[0050] The computer 1 is the core component of the three-dimensional sound velocity method temperature measurement system. The system uses the audio file of the preset sweep frequency signal stored in the computer 1 as the sound source signal for the sound velocity method temperature measurement; at the same time, the computer 1 receives and stores all the data from the signal analyzer 7, and obtains the sound wave flight time by cross-correlation analysis; according to the sound wave flight time, the positional relationship between the three-dimensional platform 4 and the speaker 5 and the microphone 6, the three-dimensional temperature field of the gas in the three-dimensional space surrounded by the three-dimensional platform 4 is reconstructed through the least squares QR decomposition (LSQR) method.

[0051] The relay 3 is a multi-channel serial port relay, which controls the on and off of the circuit in the temperature measurement system to control multiple speakers 5 to emit corresponding sweep frequency sound wave signals in sequence; the measurement sequence is controlled by the relay 3, which improves the speed and efficiency of the measurement;

[0052] As a preferred embodiment of the utility model, the speaker 5 is an electric sound source, which converts the input analog signal into a sound wave signal and outputs it. It has a simple structure, is safe and stable, has mature technology, can emit various types of sound wave signals, and is suitable for sound source selection for temperature measurement using the sound velocity method.

[0053] The microphone 6 is a non-directional measurement microphone, suitable for measuring in a free field or semi-free field without reflection. It adopts a pre-polarization method without the need for an external polarization voltage, and is suitable for microphone selection for temperature measurement by the sound velocity method. Multiple microphones 6 remain turned on during the measurement process and convert the received sound signals into electrical signals, which are then transmitted to the signal analyzer 7 for adjustment and collection; the signal analyzer 7 integrates signal conditioning and signal collection functions, and its multi-channel sampling channels realize multi-channel continuous signal collection of digital sound waves, and support subsequent channel expansion. All data collected by the signal analyzer 7 are finally transmitted to the computer 1 for storage, calculation and analysis.

[0054] As a preferred embodiment of the utility model, the three-dimensional platform 4 is a cube platform with a side length of 1 meter. The cube frame can match the appearance of a large number of industrial equipment and is suitable for the sonic velocity temperature measurement of industrial combustion equipment. A total of 20 sensor installation sites are set at the end points and midpoints of each side of the three-dimensional platform 4, such as Figure 1 As shown by the five-pointed star on the central cube stand.

[0055] like Figure 1As shown, the three-dimensional temperature field sound velocity measurement method of the three-dimensional sound velocity temperature measurement system of the utility model, according to the sound velocity temperature measurement principle, based on the dependence of sound velocity on temperature, can obtain the sound wave flight time of the sound wave propagating inside the three-dimensional test area in the target area; specifically, there are 20 loudspeaker 5 and microphone 6 installation points on the three-dimensional platform 4, when the connection line between two installation points is located inside the three-dimensional test area rather than on the surface of its three-dimensional platform, the sound wave flight time between the two installation points is measured, thus a total of 58 sound wave flight times need to be measured.

[0056] The three-dimensional sound velocity method temperature measurement system generates an analog signal of a linear frequency sweep signal with a sweep frequency range of 1-3kHz and a sweep frequency period of 0.1s through a signal generation program and a sound card of a computer 1; after being amplified by a single-channel power amplifier 2 with a rated power of 50W, 20 4Ω / 5W small electric speakers 5 are controlled by a 32-way serial port relay 3 to convert the analog signal output by the computer 1 into a sound wave signal for transmission in turn.

[0057] After the relay 3 controls a single speaker 5 to transmit a sound wave signal, 20 prepolarized electret non-directional measurement microphones 6 with an open circuit sensitivity of 50±2mV / Pa and a frequency response range of 20kHz work throughout the process, and convert the received 20-channel sound signals into electrical signals and transmit them to the signal analyzer 7 for adjustment, collection, and finally transmit them to the computer 1 for storage and cross-correlation analysis. Specifically, the microphone 6 installed adjacent to the designated speaker 5 on the three-dimensional platform 4 first receives the sound signal emitted by the designated speaker 5, and then the other microphones 6 away from the designated speaker 5 successively receive the sound signal emitted by the designated speaker 5. At this time, the signal received by the microphone 6 adjacent to the designated speaker 5 and the signal received by the other microphones 6 are cross-correlatedly analyzed to obtain the sound wave flight time of the sound signal from the microphone 6 adjacent to the designated speaker 5 to the other microphones 6 (specifically, the peak location, signal interception, and PHAT weighted cross-correlation delay estimation are performed in sequence for the 20-channel signals received by all the microphones 6, and the sound wave flight time of the sound signal between each microphone pair 6 can be obtained). Therefore, after the relay 3 controls the different loudspeakers 5 to work in sequence, the computer 1 finally obtains the required multiple sound wave flight times.

[0058] Based on the measured multiple sound wave flight times and the positional relationship between the three-dimensional platform 4 and the speaker 5 and the microphone 6, the gas temperature in the three-dimensional space surrounded by the three-dimensional platform 4 is calculated by the least squares QR decomposition (LSQR) method, and then the three-dimensional temperature field of the gas in the three-dimensional space is obtained.

[0059] The utility model uses the non-contact sound velocity method temperature measurement principle to measure the overall temperature of the gas medium in three-dimensional space, making a more comprehensive contribution to the temperature monitoring of key areas of the furnace; the utility model uses mature microphones and loudspeakers and other equipment, and controls the measurement sequence through relays, thereby improving the speed and efficiency of measurement; and minimizes the interference of the measurement process on the area to be measured, thereby improving the measurement accuracy; considering the influence of measurement background noise, sound wave attenuation, reverberation and other factors, the sound source signal and time delay estimation method are selected according to actual conditions, thereby improving the measurement accuracy of the sound wave flight time and the reconstruction accuracy of the three-dimensional temperature field; the three-dimensional sound velocity method temperature measurement can be extended to the measurement of three-dimensional areas to be measured of other shapes other than cubes, and has good applicability.

[0060] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A three-dimensional sound velocity method temperature measurement system, characterized in that: It includes a computer (1), a power amplifier (2), a relay (3), a three-dimensional stand (4), a loudspeaker (5), a microphone (6) and a signal analyzer (7); The analog signal output end of the computer (1) is connected to the signal input end of the power amplifier (2), the signal output end of the power amplifier (2) is connected to the signal input end of the relay (3), the signal output end of the relay (3) is connected to the input end of the speaker (5), the output end of the speaker (5) is connected to the signal receiving end of the microphone (6), the signal output end of the microphone (6) is connected to the input end of the signal analyzer (7), and the signal output end of the signal analyzer (7) is connected to the USB port of the computer (1); the speakers (5) and microphones (6) are multiple groups, and each group of speakers (5) and microphones (6) is located at the same position on the three-dimensional platform (4). The measurement target of the three-dimensional sound velocity method temperature measurement system is the gas temperature in the three-dimensional measurement area surrounded by the three-dimensional platform (4).

2. A three-dimensional sound velocity method temperature measurement system as claimed in claim 1, characterized in that: The loudspeaker (5) and the microphone (6) as non-contact measuring devices are located on the three-dimensional platform (4) outside the three-dimensional area to be measured, and do not interfere with the heat and mass exchange in the three-dimensional area to be measured.

3. A three-dimensional sound velocity method temperature measurement system as claimed in claim 1, characterized in that: Installation sites are set at the end points and midpoints of each side of the three-dimensional platform (4), with a total of 20 installation sites for installing 20 loudspeakers (5) and 20 microphones (6); at the installation sites of the three-dimensional platform (4), a single loudspeaker (5) and microphone (6) are installed adjacent to each other at the same position, and it is approximately considered that the two are in the same position.

4. A three-dimensional sound velocity method temperature measurement system as claimed in claim 1, characterized in that: The relay (3) is a multi-channel serial port relay, which controls the on and off of the circuit in the temperature measurement system to control multiple speakers (5) to emit corresponding swept frequency sound wave signals in sequence; the measurement sequence is controlled by the relay (3).

5. A three-dimensional sound velocity method temperature measurement system as claimed in claim 1, characterized in that: The loudspeaker (5) is an electrodynamic sound source, which converts an input analog signal into a sound wave signal and outputs the signal.

6. A three-dimensional sound velocity method temperature measurement system as claimed in claim 1, characterized in that: The microphone (6) is a non-directional measurement microphone. During the measurement process, the multiple microphones (6) remain turned on and convert the received sound signals into electrical signals, which are then transmitted to the signal analyzer (7) for adjustment and collection.

7. A three-dimensional sound velocity method temperature measurement system as claimed in claim 1, characterized in that: The signal analyzer (7) integrates a signal conditioning function and a signal collection function, and its multi-channel sampling channels realize multi-channel continuous signal collection of digitized sound waves and support subsequent channel expansion.

8. A three-dimensional sound velocity method temperature measurement system as claimed in claim 1, characterized in that: The three-dimensional platform (4) is a cube platform.

Images