High-temperature-resistant piezoelectric acoustic sensor

Abstract

The utility model provides a high-temperature-resistant piezoelectric acoustic transducer, which comprises a transducer, a preamplifier and a high-temperature-resistant cable, sound waves act on a shell at the bottom of the transducer, the shell transmits pressure to a piezoelectric patch, an electric polarization phenomenon is generated in the piezoelectric patch, and sound signals are converted into electric signals through a series of processing. The piezoelectric acoustic sensor provided by the utility model is of a closed structure, does not need a sound transmission hole, can adapt to a severe environment, can measure relatively large sound pressure, has a relatively wide temperature range, and can be used at the temperature of-40 DEG C to 350 DEG C.

Description

Technical Field

[0001] This utility model relates to the field of acoustic sensor technology, and in particular to a high-temperature resistant piezoelectric acoustic sensor. Background Technology

[0002] The acoustic sensor industry is in a phase of rapid development, with continuously growing market demand driving its ongoing progress. With the rapid development of technologies such as the Internet of Things, big data, and cloud computing, acoustic sensors are being used more and more widely in various fields, such as oil and gas exploration, traffic noise monitoring, groundwater level monitoring, earthquake monitoring, and smart cities. The rapid development of these application areas provides the acoustic sensor industry with a vast market space and growth momentum.

[0003] However, in harsh environments such as high-temperature or high-sound-pressure scenarios, like detecting explosives, conventional condenser microphones are often insufficient to meet practical needs due to their structural or material limitations. Summary of the Invention

[0004] To overcome the shortcomings of the above-mentioned technologies, this utility model proposes a high-temperature resistant piezoelectric acoustic sensor, comprising a transducer, a preamplifier, and a high-temperature resistant cable:

[0005] (1) The transducer includes a transducer housing, a piezoelectric sheet group consisting of a first piezoelectric sheet, a conductive sheet, and a second piezoelectric sheet stacked coaxially, as well as an insulating sleeve, a mass block, a locking nut, and a transducer cover;

[0006] The piezoelectric element assembly is pressed and fixed inside the transducer housing by an insulating sleeve;

[0007] The conductive sheet is connected to the high-temperature resistant cable, and the other end of the high-temperature cable is provided with an electrical connector;

[0008] The mass block is located on the upper side of the piezoelectric sheet assembly, the locking nut is located on the upper side of the mass block, and a transducer cover is provided on the upper side of the locking nut. The transducer cover is fixed to the transducer housing.

[0009] (2) The preamplifier includes a socket that contacts the electrical connector, a signal processing board that connects to the socket, a connector that connects to the signal processing board, an adapter sleeve that fixes the connector, and a front housing that accommodates the above components.

[0010] (3) The transducer and the preamplifier are connected to the socket of the preamplifier through the connector of the high-temperature cable of the transducer.

[0011] Preferably, one end of the conductive sheet is placed between the first piezoelectric sheet and the second piezoelectric sheet, and the other end passes through the insulating sleeve, the mass block and the locking nut to connect with the high-temperature resistant cable;

[0012] Preferably, the insulating sleeve is made of high-temperature resistant aluminum oxide material;

[0013] Preferably, the two ends of the transducer cover have different diameters, with the larger diameter end connected to the transducer housing, and the high-temperature resistant cable leading out from the smaller diameter end;

[0014] Preferably, the adapter sleeve has internal threads, and the connector is fixed inside the adapter sleeve by the threads;

[0015] Preferably, the bottom of the transducer housing is a sound pressure receiving surface, and an annular groove is provided inside it.

[0016] This invention proposes a high-temperature resistant piezoelectric acoustic sensor. Sound waves act on the outer shell, which transmits pressure to the piezoelectric element, causing it to deform. This results in polarization within the piezoelectric element, and through a series of processes, the sound signal is converted into an electrical signal. The advantages of this invention are: the piezoelectric acoustic sensor has a closed structure, requiring no sound-transmitting hole, allowing it to adapt to harsh environments and measure relatively high sound pressure levels; it also has a wide temperature adaptability, operating from -40℃ to 350℃. Attached Figure Description

[0017] Figure 1 This is a cross-sectional structural diagram of a piezoelectric acoustic sensor according to the present invention;

[0018] Figure 2 This is a structural diagram of the internal part of the transducer of a piezoelectric acoustic sensor according to the present invention.

[0019] Figure 3 This is a longitudinal cross-sectional view of the transducer housing of a piezoelectric acoustic sensor according to the present invention;

[0020] Figure 4 This is a schematic diagram of the transducer of a piezoelectric acoustic sensor according to the present invention;

[0021] Figure 5 This is a schematic diagram of a preamplifier for a piezoelectric acoustic sensor according to the present invention;

[0022] Figure 6 This is a schematic diagram of the appearance of a piezoelectric acoustic sensor according to the present invention. Detailed Implementation

[0023] The following are specific embodiments of the present invention, and the technical solution of the present invention will be further described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0024] like Figure 1As shown, it specifically includes: transducer housing 1, first piezoelectric sheet 2, second piezoelectric sheet 3, insulating sleeve 4, conductive sheet 5, mass block 6, locking nut 7, crimp terminal 8, transducer top cover 9, high temperature resistant cable 10, electrical connector 11, socket 12, front housing 13, signal processing board 14, adapter sleeve 15, connector 16.

[0025] Figure 2 Includes insulating sleeve 4, conductive sheet 5, mass block 6, notch 101, and round hole 102. Figure 3 Includes transducer housing 1 and annular groove 103, Figure 4 For transducers, Figure 5 It is a preamplifier. Figure 6 This is an overall appearance diagram of a high-temperature resistant piezoelectric acoustic sensor.

[0026] The first piezoelectric sheet 2, the conductive sheet 5, and the second piezoelectric sheet 3 are coaxially stacked at the bottom of the transducer housing 1. The insulating sleeve 4 is fitted over the outside of the above structure and pressed and fixed to the bottom of the transducer housing. The insulating sleeve 4 is annular and has a notch 101 on its surface.

[0027] Furthermore, a mass block 6 is placed on the second piezoelectric sheet 3. The mass block 6 is a hollow ring with an opening at the bottom. One end of the conductive sheet 5 is pressed between the first piezoelectric sheet 2 and the second piezoelectric sheet 3, and the other end passes through the center of the notch 101, the mass block 6, and the locking nut 7. It is connected to the high-temperature resistant cable 10 through the crimp terminal 8. The hollow part of the transducer cover 9 is filled with high-temperature resistant glue. The transducer cover 9 is fixed to the transducer shell by welding to form the transducer.

[0028] Furthermore, the bottom of the transducer housing 1 is a sound pressure receiving surface, and there is an annular groove 103 inside it. The thickness of the housing at the groove is only 0.4 mm. The sound pressure change causes the housing at the groove to vibrate, thereby driving the vibration of the entire bottom, which generates pressure on the first piezoelectric sheet 2 and the second piezoelectric sheet 3. The piezoelectric material converts the pressure into charge based on its own properties, and further converts it into an electrical signal through a series of processes, thus realizing the conversion of sound signal into electrical signal.

[0029] Further, corresponding components are soldered onto the signal processing board 14, the connector 16 is screwed into the internal thread of the adapter sleeve 15, and then the signal processing board 14 with the soldered components is soldered onto the connector 16. A lead wire is soldered to the other end of the signal processing board 14, and the lead wire is longer than the front housing 13. The adapter sleeve 15 is screwed into the internal thread of one end of the front housing 13, and the lead wire passes through the front housing 13 and comes out from the other end.

[0030] Furthermore, the lead wire passing through the front housing 13 is soldered to the socket 12, and the socket 12 is connected to the front housing 13 by threads and then sealed with adhesive.

[0031] Furthermore, by screwing the electrical connector 11 on the transducer to the socket 12 on the preamplifier, a complete high-temperature resistant piezoelectric acoustic sensor is formed.

Claims

1. A high-temperature resistant piezoelectric acoustic sensor, comprising a transducer, a preamplifier, and a high-temperature resistant cable, characterized in that: (1) The transducer includes a transducer housing, a piezoelectric sheet group consisting of a first piezoelectric sheet, a conductive sheet, and a second piezoelectric sheet stacked coaxially, as well as an insulating sleeve, a mass block, a locking nut, and a transducer cover; The piezoelectric element assembly is pressed and fixed inside the transducer housing by an insulating sleeve; The conductive sheet is connected to the high-temperature resistant cable, and the other end of the high-temperature cable is provided with an electrical connector; The mass block is located on the upper side of the piezoelectric sheet assembly, the locking nut is located on the upper side of the mass block, and a transducer cover is located on the upper side of the locking nut. The transducer cover is fixed to the transducer housing. (2) The preamplifier includes a socket that contacts the electrical connector, a signal processing board that connects to the socket, a connector that connects to the signal processing board, an adapter sleeve that fixes the connector, and a front housing that accommodates the above components. (3) The transducer is connected to the preamplifier via a high-temperature resistant cable.

2. The high temperature piezoelectric acoustic sensor of claim 1, wherein, One end of the conductive sheet is placed between the first piezoelectric sheet and the second piezoelectric sheet, and the other end passes through the insulating sleeve, the mass block and the locking nut to connect with the high-temperature resistant cable.

3. The high-temperature resistant piezoelectric acoustic sensor according to claim 1, characterized in that, The insulating sleeve is made of high-temperature resistant aluminum oxide material.

4. The high-temperature resistant piezoelectric acoustic sensor according to claim 1, characterized in that, The transducer cover has different diameters at both ends. The end with the larger diameter is connected to the transducer housing, and the high-temperature resistant cable is led out from the end with the smaller diameter.

5. The high-temperature resistant piezoelectric acoustic sensor according to claim 1, characterized in that, The adapter sleeve has internal threads, and the connector is fixed inside the adapter sleeve by the threads.

6. The high-temperature resistant piezoelectric acoustic sensor according to claim 1, characterized in that, The bottom of the transducer housing is a sound pressure receiving surface, and an annular groove is provided inside it.

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