CN111829648A - Piezoelectric noise sensor probe - Google Patents
Piezoelectric noise sensor probe Download PDFInfo
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- CN111829648A CN111829648A CN202010718554.0A CN202010718554A CN111829648A CN 111829648 A CN111829648 A CN 111829648A CN 202010718554 A CN202010718554 A CN 202010718554A CN 111829648 A CN111829648 A CN 111829648A
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- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
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- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H11/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties
- G01H11/06—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties by electric means
- G01H11/08—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties by electric means using piezoelectric devices
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Abstract
A piezoelectric noise sensor probe belongs to the technical field of aerospace sensors. The problems of large measurement error and complex structure of the conventional piezoelectric noise sensor are solved. The invention comprises a cylindrical shell, an upper cover, a lower cover, two sensitive core body components, a base, a screw rod and a vibrating diaphragm; the vibrating diaphragm seals the upper end face of the cylindrical shell and is positioned below the upper cover; the two sensitive core body assemblies, the base and the screw rod are all positioned in the cylindrical shell; the two sensitive core assemblies are respectively positioned above and below the base and arranged in a mirror image mode relative to the base; external noise acts on the vibrating diaphragm through the upper cover, and the movement of the vibrating diaphragm under the action of the external noise enables the sound sensitive component to generate charges due to the piezoelectric effect; external vibration causes the sound sensitive component and the compensation component to generate charges due to piezoelectric effect, and the charges generated by the sound sensitive component and the compensation component have opposite polarities, so that the compensation of the compensation component on the sound sensitive component under the external vibration condition is realized. The invention is mainly applied to the technical field of aerospace sensors.
Description
Technical Field
The invention relates to a piezoelectric noise sensor probe, and belongs to the technical field of aerospace sensors.
Background
One investigation by NASA in the united states has shown that nearly 50% of aircraft failures after launch are caused by vibration, shock and noise loads during the launch phase. Therefore, the external noise of the aircraft during launch and flight must be measured. The measurement result can provide a basis for the fault analysis of the aircraft, and is used for constructing a health monitoring system of the aircraft, so that the structural design of the aircraft is optimized.
The aircraft interacts with the atmosphere during high-speed flight, a turbulent boundary layer is formed near the surface of the aircraft, and therefore a strong air pulsation pressure field is generated on the outer surface layer of the aircraft, and the induced aerodynamic noise field is a high-sound strong sound field which is distributed unevenly in space and randomly distributed in time and has a broadband frequency component. The sound field can generate structural noise inside and outside the aircraft, and the noise sound field reacts on the aircraft to generate a severe dynamic environment with high sound pressure level noise inside and outside the aircraft. Meanwhile, due to air friction and structural vibration of the aircraft in the flight process, the measurement of noise parameters often faces a high-temperature vibration environment. Therefore, the noise sensor is required to have the characteristics of high sound pressure level measurement, high temperature resistance, vibration resistance and the like.
The noise sensor generally includes a capacitance type, an electret type, a silicon piezoresistive type, an optical fiber type, a piezoelectric type, and the like. The capacitive noise sensor is complex in application circuit, high in cost and greatly influenced by air pressure change in the flying process of the aircraft. The electret type noise sensor has weak temperature and humidity resistance, can lose charges under certain conditions, and cannot work in a high-temperature environment. When the working temperature of the silicon piezoresistive noise sensor exceeds 125 ℃, the p-n junction fails due to the aggravation of the leakage of the p-n junction between the strain resistor and the substrate, so that the sensor cannot meet the requirements of practical application. The optical fiber type noise sensor has high working temperature, but the accuracy of an output signal of the optical fiber type noise sensor is greatly influenced by the internal structure determining impact and vibration environment.
The maximum working temperature of the existing piezoelectric type noise sensor is 260 degrees, the measurable maximum sound pressure level is about 100dB, the working temperature range is narrow, the piezoelectric type noise sensor is not suitable for the environment with higher temperature, the measurable maximum sound pressure level is low, the piezoelectric type noise sensor is not suitable for being used under severe environments with higher temperature, vibration and the like, the measuring error is large, and the structure is complex, so that the problems need to be solved urgently.
Disclosure of Invention
The invention aims to solve the problems of large measurement error and complex structure of the conventional piezoelectric noise sensor, and provides a probe of the piezoelectric noise sensor.
A piezoelectric type noise sensor probe is of a fully-enclosed structure and comprises a cylindrical shell, an upper cover, a lower cover, two sensitive core body assemblies, a base, a screw rod and a vibrating diaphragm;
the upper cover is screwed on the side wall of the upper port of the cylindrical shell, the upper end surface of the cylindrical shell is sealed through the vibrating diaphragm, and the vibrating diaphragm is positioned below the upper cover; the upper cover is provided with a plurality of through holes which are used for conducting noise;
the lower cover is covered on the lower port of the cylindrical shell, and a lead port is arranged on the lower cover;
the two sensitive core body assemblies, the base and the screw rod are all positioned in the cylindrical shell;
the base is a circular cylinder, the outer wall surface of the circular cylinder is in threaded connection with the inner wall surface of the cylindrical shell, and a plurality of beam holes are distributed in the base;
the screw rod penetrates through the circular column body in the vertical direction and is in threaded connection with the inner wall surface of the circular column body;
the two sensitive core body assemblies are respectively positioned above and below the base and arranged in a mirror image mode relative to the base, and both the two sensitive core body assemblies are sleeved on the screw and are in threaded connection with the screw; the upper end surface of the sensitive core body assembly positioned above the base extrudes the vibrating diaphragm to jack the vibrating diaphragm, and a space exists between the jacked vibrating diaphragm and the upper cover;
the sensitive core body assembly positioned above the base is used as an acoustic sensitive assembly, and the sensitive core body assembly positioned below the base is used as a compensation assembly; the top end surface of the screw is lower than the upper end surface of the sound sensitive component;
external noise acts on the vibrating diaphragm through the upper cover, and the movement of the vibrating diaphragm under the action of the external noise enables the sound sensitive component to generate charges due to the piezoelectric effect;
external vibration causes the sound sensitive component and the compensation component to generate charges due to piezoelectric effect, the polarity of the charges generated by the compensation component is opposite to that of the charges generated by the sound sensitive component, and compensation of the compensation component on the sound sensitive component under the external vibration condition is achieved.
Preferably, each sensitive core body assembly comprises M piezoelectric ceramic plates, M electrode plates and a cover cap; the M piezoelectric ceramic plates, the M electrode plates and the cap are all circular sheet bodies; m is an integer greater than or equal to 2, and the polarities of the two sides of each piezoelectric ceramic piece are different; all the electrode sheets are provided with charge leading-out ends;
the M piezoelectric ceramic pieces are sequentially a first piezoelectric ceramic piece to an Mth piezoelectric ceramic piece from bottom to top, wherein a cover cap is arranged above the Mth piezoelectric ceramic piece and is in threaded connection with the screw rod;
an electrode plate is arranged between any two of the first to Mth piezoelectric ceramic pieces, an electrode plate is arranged between the Mth piezoelectric ceramic piece and the cap, and the polarities of the two adjacent electrode plates in the vertical direction are different;
wherein the content of the first and second substances,
the electrode slice between the jth and the (j + 1) th piezoelectric ceramic slices is used as a positive electrode slice, j is an odd number and is less than M;
an electrode slice between the ith piezoelectric ceramic piece and the (i + 1) th piezoelectric ceramic piece is used as a negative electrode slice, i is an even number and is less than M;
the polarity of the corresponding side of the piezoelectric ceramic piece adjacent to each positive electrode piece is a positive electrode;
the polarity of the corresponding side of the piezoelectric ceramic piece adjacent to each negative electrode piece is a negative electrode;
the charge leading-out ends of all positive electrode plates on the two sensitive core body assemblies are simultaneously connected through No. 1 conducting wires and then are led out from a lead port as the positive leading-out end of the piezoelectric type noise sensor probe;
the charge leading-out ends of all negative electrode plates on the two sensitive core body assemblies are simultaneously connected through No. 2 conducting wires and then are led out from a lead port as the negative leading-out end of the piezoelectric type noise sensor probe;
the No. 1 conducting wire and the No. 2 conducting wire are led into the lower part of the base from the upper part of the base through the wire-bundling holes;
the caps in both sensitive core assemblies are far away from the base.
Preferably, each electrode piece is provided with two charge leading-out terminals, wherein one charge leading-out terminal is used as a spare terminal.
Preferably, the piezoelectric noise sensor probe further comprises a flange, and the flange is nested on the outer side of the cylindrical shell.
Preferably, the deformation directions of the two sensitive core assemblies are opposite.
Preferably, the thickness of the diaphragm is 0.5mm to 1 mm.
Preferably, the vertical distance between the top of the lifted diaphragm and the upper cover is 1.5mm to 2 mm.
The invention has the following beneficial effects: the invention provides a noise sensor probe capable of detecting noise in a vibration environment. The base effectively isolates the sound sensitive component from the compensation component, so that the compensation component is insensitive to external noise, and charges generated by the compensation component are the same as the sensitive direction of the sound sensitive component and have opposite polarities, therefore, in the process that the sensor probe is interfered by an acceleration signal, the sound sensitive component and the compensation component on two sides of the base simultaneously generate charges under piezoelectric effect, and the charges generated by the sound sensitive component and the compensation component are mutually offset, so that the noise sensor probe is not interfered by a vibration signal, and the measurement precision is improved. The invention has simple structure and is convenient to realize.
The invention provides a noise sensor probe which is low in power consumption and can work in a high-temperature environment, the probe adopts a piezoelectric principle, external power supply is not needed during working, no electronic element is arranged inside the probe, and the power consumption of the noise sensor probe is reduced; the sound sensitive component and the compensation component are both made of piezoelectric ceramics with high Curie temperature, the probe structural member is made of stainless steel, and the electrical connection inside the probe can be welded by pressure welding, so that the working temperature range of the probe is effectively enlarged;
the piezoelectric noise sensor probe can accurately measure noise under severe environments such as high impact, high temperature, vibration and the like.
The piezoelectric noise sensor probe is mainly used for measuring the noise parameters of the outer surface of an aircraft, the working temperature range is-40-500 ℃, and the measurable maximum sound pressure level is 180 dB. The invention can be applied to the technical field of aerospace sensors and provides technical support for the problem of external noise detection during launching and flying of an aircraft.
Drawings
FIG. 1 is a top view of a piezoelectric noise sensor probe according to the present invention;
FIG. 2 is a view in the direction A of FIG. 1;
FIG. 3 is a front cross-sectional view of FIG. 2;
FIG. 4 is a view showing the connection of the negative electrode plates 4-4 of the two sensitive core assemblies 4;
FIG. 5 is a diagram showing the connection of the positive electrode plates 4-3 in the two sensitive core assemblies 4;
FIG. 6 is a top view of an electrode sheet having one charge tap;
fig. 7 is a plan view of an electrode sheet having two charge extraction terminals;
fig. 8 is a front view of an electrode sheet having two charge extraction terminals.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The present embodiment is described with reference to fig. 1 to 3, and the piezoelectric noise sensor probe according to the present embodiment is a fully enclosed structure, and includes a cylindrical shell 1, an upper cover 2, a lower cover 3, two sensitive core assemblies 4, a base 5, a screw rod 6 and a diaphragm 7;
the upper cover 2 is screwed on the side wall of the upper port of the cylindrical shell 1, the upper end surface of the cylindrical shell 1 is sealed through a vibrating diaphragm 7, and the vibrating diaphragm 7 is positioned below the upper cover 2; the upper cover 2 is provided with a plurality of through holes 2-1, and the through holes 2-1 are used for conducting noise;
the lower cover 3 is covered on the lower port of the cylindrical shell 1, and a lead port 3-1 is arranged on the lower cover 3;
the two sensitive core assemblies 4, the base 5 and the screw 6 are all positioned in the cylindrical shell 1;
the base 5 is a circular ring-shaped cylinder, the outer wall surface of the circular ring-shaped cylinder is in threaded connection with the inner wall surface of the cylindrical shell 1, and a plurality of wire-bundling holes 5-1 are distributed on the base 5;
the screw 6 penetrates through the circular column in the vertical direction and is in threaded connection with the inner wall surface of the circular column;
the two sensitive core body assemblies 4 are respectively positioned above and below the base 5 and arranged in a mirror image mode relative to the base 5, and the two sensitive core body assemblies 4 are sleeved on the screw rod 6 and are in threaded connection with the screw rod 6; wherein, the upper end surface of the sensitive core component 4 above the base 5 extrudes the diaphragm 7, so that the diaphragm 7 is jacked, and a space exists between the jacked diaphragm 7 and the upper cover 2;
the sensitive core body assembly 4 positioned above the pedestal 5 is used as an acoustic sensitive assembly, and the sensitive core body assembly 4 positioned below the pedestal 5 is used as a compensation assembly; the top end surface of the screw rod 6 is lower than the upper end surface of the sound sensitive component;
external noise acts on the vibrating diaphragm 7 through the upper cover 2, and the movement of the vibrating diaphragm 7 under the action of the external noise enables the sound sensitive component to generate charges due to the piezoelectric effect;
external vibration causes the sound sensitive component and the compensation component to generate charges due to piezoelectric effect, the polarity of the charges generated by the compensation component is opposite to that of the charges generated by the sound sensitive component, and compensation of the compensation component on the sound sensitive component under the external vibration condition is achieved.
In this embodiment, the two sensitive core assemblies 4 have the same structure, one is used as a sound sensitive assembly, the other is used as a compensation assembly, the base 5 effectively isolates the sound sensitive assembly from the compensation assembly, so that the compensation assembly is insensitive to external noise, when the sound sensitive assembly and the compensation assembly generate charges due to a piezoelectric effect, the sound sensitive assembly and the compensation assembly deform themselves, wherein the deformation states of the sound sensitive assembly and the compensation assembly are opposite, the deformation state of the sound sensitive assembly is an extension state, the deformation state of the compensation assembly is a shortening state, so that the polarities of the charges generated by the external vibration of the sound sensitive assembly and the compensation assembly are opposite, and the charges generated by the vibration of the compensation assembly are used as compensation charges to compensate the charges generated by the vibration of the sound sensitive assembly, so that the charge cancellation is realized, and. The piezoelectric noise sensor probe is simple in structure and convenient to implement.
During assembly, the distance exists between the upper end face of the sound sensitive component and the vibrating diaphragm 7, and when the sound sensitive component generates charges due to a piezoelectric effect in specific application, the vibrating diaphragm 7 can be jacked up due to deformation.
When the noise sensor probe is applied, the internal electrical connection of the noise sensor probe adopts a pressure welding mode;
the lower cover 3 is connected with the cylindrical shell 1 in an argon arc welding mode, and the materials of the lower cover and the cylindrical shell can be stainless steel;
the upper cover 2 and the vibrating diaphragm 7 can be made of stainless steel and have the thickness of 0.5 mm-1 mm. The vibrating diaphragm 7 is connected with the cylindrical shell 1 in an argon arc welding mode, the melting depth is required to be uniform, welding seams are required to be flat and have no defects of burning marks, air holes, sand holes, open welding, welding leakage, burning through and the like, and the surface of the vibrating diaphragm 7 is required to be smooth, have no spots, folding, nest holes and pressure damage marks after welding.
Further, referring to fig. 2 to 6, each sensitive core assembly 4 comprises M piezoceramic wafers 4-1, M electrode pads and a cap 4-2; wherein, M piezoelectric ceramic pieces 4-1, M electrode plates and a cover cap 4-2 are all circular ring-shaped pieces; m is an integer greater than or equal to 2, and the polarity of the two sides of each piezoelectric ceramic piece 4-1 is different; all the electrode sheets are provided with charge leading-out ends;
the M piezoelectric ceramic pieces 4-1 are sequentially a first piezoelectric ceramic piece 4-1 to an Mth piezoelectric ceramic piece 4-1 from bottom to top, wherein a cover cap 4-2 is arranged above the Mth piezoelectric ceramic piece 4-1, and the cover cap 4-2 is in threaded connection with a screw 6;
an electrode plate is arranged between any two piezoelectric ceramic pieces 4-1 in the first piezoelectric ceramic piece to the Mth piezoelectric ceramic piece 4-1, an electrode plate is arranged between the Mth piezoelectric ceramic piece 4-1 and the cover cap 4-2, and the polarities of the two adjacent electrode plates in the vertical direction are different;
wherein the content of the first and second substances,
the electrode slice between the jth piezoelectric ceramic piece 4-1 and the jth +1 is used as a positive electrode slice 4-3, j is an odd number and is less than M;
an electrode slice between the ith piezoelectric ceramic piece 4-1 and the (i + 1) th piezoelectric ceramic piece is used as a negative electrode slice 4-4, i is an even number and is less than M;
the polarity of the corresponding side of the piezoelectric ceramic piece 4-1 adjacent to each positive electrode piece 4-3 is a positive electrode;
the polarity of the corresponding side of the piezoelectric ceramic piece 4-1 adjacent to each negative electrode piece 4-4 is a negative electrode;
the charge leading-out ends of all positive electrode plates 4-3 on the two sensitive core body assemblies 4 are simultaneously connected through a No. 1 lead wire 9 and then are taken as the positive leading-out end of the piezoelectric type noise sensor probe to be led out from a lead port 3-1;
the charge leading-out ends of all negative electrode plates 4-4 on the two sensitive core body assemblies 4 are simultaneously connected through a No. 2 lead wire 10 and then are taken as the negative leading-out end of the piezoelectric type noise sensor probe to be led out from a lead port 3-1;
the No. 1 conducting wire 9 and the No. 2 conducting wire 10 are both led into the lower part of the base 5 from the upper part of the base 5 through the wire harness hole 5-1;
the caps 4-2 in both sensitive core assemblies 4 are remote from the base 5.
In the preferred embodiment, the electrode sheet between the first to third piezoelectric ceramic sheets 4-1 is taken as an example for explanation, wherein the electrode sheet between the first and second piezoelectric ceramic sheets 4-1 is taken as a positive electrode sheet 4-3, and the electrode sheet between the second and third piezoelectric ceramic sheets 4-1 is taken as a negative electrode sheet 4-4; by analogy, the polarities of the two adjacent electrode plates in the vertical direction are different.
When the device is used, the electrodes and the wires are used for leading out electric charges to the high-temperature coaxial cable, and the electric charges are collected and processed by the back-end circuit, so that the purpose of measuring noise signals is achieved.
After the electrode is assembled, pressure welding is carried out between the positive electrode plate 4-3 and the positive electrode plate 4-3, pressure welding is carried out between the negative electrode plate 4-4 and the negative electrode plate 4-4, and the electrode can be made of stainless steel.
The wire is made of stainless steel, and the welding position of the wire and the electrode plate is welded by pressure welding.
Further, referring specifically to fig. 7 and 8, two charge leading-out terminals are provided on each electrode sheet, wherein one charge leading-out terminal serves as a spare terminal.
In the preferred embodiment, each electrode plate is provided with two charge leading-out ends, wherein one charge leading-out end is used as a spare end, and the other charge leading-out end is used for normal wiring, so that when the piezoelectric noise sensor probe performs detection, the spare end can be fixed, and the spare end is prevented from touching the diaphragm 7 due to vibration.
When the positive electrode plate is applied, the two charge leading-out ends of the positive electrode plate 4-3 and the two leading-out ends of the negative electrode plate 4-4 are distributed in a staggered mode, and wire hooking is avoided.
In particular, the electrode sheet structure with a charge leading-out terminal is shown in fig. 6.
Further, a piezoelectric noise sensor probe, as described with particular reference to fig. 1-3, further includes a flange 8, and the flange 8 is nested on the outside of the cylindrical housing 1.
In the preferred embodiment, the piezoelectric noise sensor probe is conveniently arranged on a corresponding peripheral device by additionally arranging the flange 8. The flange 8 can be a triangular flange, and has simple structure, convenient realization and stable installation.
The flange 8 and the cylindrical shell 1 are designed into an integral structure, and the material of the flange and the cylindrical shell can be stainless steel;
furthermore, the deformation directions of the two sensitive core assemblies 4 are opposite.
In the preferred embodiment, since the deformation directions of the two sensitive core assemblies 4 are opposite, the polarities of the charges generated by the two sensitive core assemblies 4 due to the influence of noise are opposite, and the compensation function can be realized.
Further, the thickness of the diaphragm 7 is 0.5mm to 1 mm.
Further, the vertical distance between the top of the lifted diaphragm 7 and the upper cover 2 is 1.5mm to 2 mm.
Although the invention herein has been described with reference to particular embodiments, it is to be understood that these embodiments are merely illustrative of the principles and applications of the present invention. It is therefore to be understood that numerous modifications may be made to the illustrative embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that features described in different dependent claims and herein may be combined in ways different from those described in the original claims. It is also to be understood that features described in connection with individual embodiments may be used in other described embodiments.
Claims (7)
1. The piezoelectric noise sensor probe is characterized in that the noise sensor probe is of a fully-enclosed structure and comprises a cylindrical shell (1), an upper cover (2), a lower cover (3), two sensitive core body assemblies (4), a base (5), a screw (6) and a vibrating diaphragm (7);
the upper cover (2) is screwed on the side wall of the upper port of the cylindrical shell (1), the upper end surface of the cylindrical shell (1) is sealed through a vibrating diaphragm (7), and the vibrating diaphragm (7) is positioned below the upper cover (2); the upper cover (2) is provided with a plurality of through holes (2-1), and the through holes (2-1) are used for conducting noise;
the lower cover (3) covers the lower port of the cylindrical shell (1), and a lead port (3-1) is arranged on the lower cover (3);
the two sensitive core assemblies (4), the base (5) and the screw (6) are all positioned in the cylindrical shell (1);
the base (5) is a circular cylinder, the outer wall surface of the circular cylinder is in threaded connection with the inner wall surface of the cylindrical shell (1), and a plurality of beam hole (5-1) are distributed on the base (5);
the screw (6) penetrates through the circular column body in the vertical direction and is in threaded connection with the inner wall surface of the circular column body;
the two sensitive core assemblies (4) are respectively positioned above and below the base (5) and arranged in a mirror image mode relative to the base (5), and the two sensitive core assemblies (4) are sleeved on the screw rod (6) and are in threaded connection with the screw rod (6); wherein, the upper end surface of the sensitive core component (4) positioned above the base (5) extrudes the diaphragm (7) to jack the diaphragm (7), and a space exists between the jacked diaphragm (7) and the upper cover (2);
the sensitive core body assembly (4) positioned above the base (5) is used as a sound sensitive assembly, and the sensitive core body assembly (4) positioned below the base (5) is used as a compensation assembly; the top end surface of the screw rod (6) is lower than the upper end surface of the sound sensitive component;
external noise acts on the vibrating diaphragm (7) through the upper cover (2), and the movement of the vibrating diaphragm (7) under the action of the external noise enables the sound sensitive component to generate charges due to the piezoelectric effect;
external vibration causes the sound sensitive component and the compensation component to generate charges due to piezoelectric effect, the polarity of the charges generated by the compensation component is opposite to that of the charges generated by the sound sensitive component, and compensation of the compensation component on the sound sensitive component under the external vibration condition is achieved.
2. The piezoelectric noise sensor probe according to claim 1, wherein each sensitive core assembly (4) comprises M piezoceramic wafers (4-1), M electrode pads and a cap (4-2); wherein, the M piezoelectric ceramic pieces (4-1), the M electrode plates and the cap (4-2) are all circular sheet bodies; m is an integer greater than or equal to 2, and the polarity of the two sides of each piezoelectric ceramic piece (4-1) is different; all the electrode sheets are provided with charge leading-out ends;
the M piezoelectric ceramic pieces (4-1) are sequentially a first piezoelectric ceramic piece to an Mth piezoelectric ceramic piece (4-1) from bottom to top, wherein a cover cap (4-2) is arranged above the Mth piezoelectric ceramic piece (4-1), and the cover cap (4-2) is in threaded connection with the screw rod (6);
an electrode plate is arranged between any two piezoelectric ceramic pieces (4-1) in the first piezoelectric ceramic piece to the Mth piezoelectric ceramic piece (4-1), an electrode plate is arranged between the Mth piezoelectric ceramic piece (4-1) and the cover cap (4-2), and the polarities of two adjacent electrode plates in the vertical direction are different;
wherein the content of the first and second substances,
the electrode slice between the jth piezoelectric ceramic piece (4-1) and the jth +1 piezoelectric ceramic piece (4-3) is used as a positive electrode slice (4-3), j is an odd number and is less than M;
an electrode slice between the ith piezoelectric ceramic piece (4-1) and the (i + 1) th piezoelectric ceramic piece is used as a negative electrode slice (4-4), i is an even number and is less than M;
the polarity of the corresponding side of the piezoelectric ceramic piece (4-1) adjacent to each positive electrode piece (4-3) is positive;
the polarity of the corresponding side of the piezoelectric ceramic piece (4-1) adjacent to each negative electrode piece (4-4) is a negative electrode;
the charge leading-out ends of all positive electrode plates (4-3) on the two sensitive core body assemblies (4) are simultaneously connected through a No. 1 conducting wire (9) and then are led out from a lead port (3-1) as the positive leading-out end of the piezoelectric noise sensor probe;
the charge leading-out ends of all negative electrode plates (4-4) on the two sensitive core body assemblies (4) are simultaneously connected through a No. 2 conducting wire (10) and then are led out from a lead port (3-1) as the negative leading-out end of a piezoelectric type noise sensor probe;
the No. 1 conducting wire (9) and the No. 2 conducting wire (10) are led into the lower part of the base (5) from the upper part of the base (5) through the wire-bundling holes (5-1);
the caps (4-2) in the two sensitive core assemblies (4) are far away from the base (5).
3. The piezoelectric noise sensor probe of claim 2, wherein each electrode plate has two charge taps, one of the charge taps being a backup.
4. The piezoelectric noise transducer probe according to claim 1, further comprising a flange (8), wherein the flange (8) is nested outside the cylindrical housing (1).
5. Piezoelectric noise transducer probe according to claim 1, wherein the two sensitive core assemblies (4) are deformed in opposite directions.
6. The piezoelectric noise sensor probe according to claim 1, wherein the diaphragm (7) has a thickness of 0.5mm to 1 mm.
7. The piezoelectric noise sensor probe according to claim 1, wherein the vertical distance between the apex of the lifted diaphragm (7) and the upper cover (2) is 1.5mm to 2 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010718554.0A CN111829648A (en) | 2020-07-23 | 2020-07-23 | Piezoelectric noise sensor probe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010718554.0A CN111829648A (en) | 2020-07-23 | 2020-07-23 | Piezoelectric noise sensor probe |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112729526A (en) * | 2020-12-21 | 2021-04-30 | 苏州长风航空电子有限公司 | High-temperature piezoelectric vibration sensor and method for improving stability thereof |
| CN114427888A (en) * | 2022-01-24 | 2022-05-03 | 上海海事大学 | Double-group piezoelectric ceramic vibration pressure sensor |
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| US5663504A (en) * | 1993-09-16 | 1997-09-02 | Kluft; Werner | Sensor system |
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| CN103217210A (en) * | 2013-03-29 | 2013-07-24 | 北京遥测技术研究所 | Piezoelectric type noise sensor |
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| US5663504A (en) * | 1993-09-16 | 1997-09-02 | Kluft; Werner | Sensor system |
| CN1712912A (en) * | 2005-08-05 | 2005-12-28 | 北京工业大学 | Piezoelectric acoustic sensor |
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| CN112729526A (en) * | 2020-12-21 | 2021-04-30 | 苏州长风航空电子有限公司 | High-temperature piezoelectric vibration sensor and method for improving stability thereof |
| CN114427888A (en) * | 2022-01-24 | 2022-05-03 | 上海海事大学 | Double-group piezoelectric ceramic vibration pressure sensor |
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