Sound pressure sensor and photoelectric signal transmission system

Abstract

The invention discloses a sound pressure sensor and a photoelectric signal transmission system, and relates to the technical field of sound pressure sensors, a photodiode and a photoelectric conversion module are adopted, signal processing is carried out in an optical vibration signal mode, and the manufacturing cost of the sensor can be effectively reduced. The sensing sheet obtains a vibration signal, the FP vibration cavity obtains a resonance signal, the optical fiber pipeline emits laser inwards, and the reflected laser vibration signal is received by the photoelectric conversion unit. The photoelectric conversion unit converts the optical vibration signal into an electric signal and sends the electric signal to the photoelectric processing circuit for analysis and processing. The design improves the signal detection efficiency and accuracy of the sensor. And the quartz sleeve and optical signal processing are adopted, so that the anti-interference capability and the environmental adaptability of the sensor are greatly enhanced. The quartz sleeve provides additional protection, so that the sensor can work stably in various complex environments, and the influence of environmental noise on a detection result is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of sound pressure sensors, and in particular to a sound pressure sensor and a photoelectric signal transmission system. Background Art

[0002] An acoustic pressure sensor is a sensor that detects defects by controlling the detection time of a piezoelectric diaphragm, such as an acoustic imager. It is widely used in the power industry, mainly to detect discharges. However, the existing acoustic pressure sensor technology still has many deficiencies and technical bottlenecks in practical applications, which restricts its performance improvement and application expansion.

[0003] The traditional sound pressure sensor has a complex structure and is difficult to integrate, especially in the design of multi-array and high-density sensors, which can easily lead to a significant increase in manufacturing costs and time. This complexity limits its promotion in some high-precision and high-demand application scenarios. Therefore, the dot matrix sensor structure is widely used now, and no more structures have been expanded. The existing sound pressure sensor array usually requires multiple transmitting and receiving units to work together to achieve precise control and composite waveform formation. This multi-unit collaborative working mode leads to high power consumption of the entire system, especially in portable and low-power applications, and the existing technology is difficult to meet the needs. In order to achieve accurate composite waveforms, the existing technology requires complex signal processing algorithms and hardware support, which not only increases the complexity of the system, but also puts higher requirements on the performance of the processor, further increasing the cost and energy consumption of the equipment. In practical applications, the existing sound pressure sensor system is easily affected by environmental factors (such as temperature, humidity, vibration, etc.), resulting in fluctuations and declines in sensor performance, and it is difficult to ensure the stability and reliability of long-term operation. Due to the complex structure, difficult manufacturing process and the required high-performance processor, the overall cost of the existing sound pressure sensor array is high, which limits its economy and popularity in large-scale applications. Summary of the invention

[0004] In view of the above problems existing in the existing sound pressure sensor, the first embodiment of the present invention is proposed.

[0005] Therefore, the present invention provides a sound pressure sensor, the purpose of which is to solve the technical problem that the existing sound pressure sensor system is easily affected by environmental factors, resulting in fluctuation and degradation of sensor performance, and it is difficult to ensure long-term working stability and reliability.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: a sound pressure sensor, comprising a sensor body unit, a sensor mounting plate, and a sensor arranged on the sensor mounting plate.

[0007] Among them, the sensor mounting plate is set to a quadrilateral, and two diagonals are set on its surface, one of the diagonals is set to direction one, and the other diagonal is set to direction two, the angle between direction one and direction two is set to the diagonal angle, and the angle between direction one and the edge of the sensor mounting plate is set to the edge angle; the sensors are evenly distributed on the sensor mounting plate along direction one and direction two.

[0008] As a preferred solution of the sound pressure sensor of the present invention, the sensor body unit further includes a reinforcing diaphragm arranged on the sensor.

[0009] As a preferred solution of the sound pressure sensor of the present invention, the reinforced diaphragm is configured as a circular diaphragm, a groove is provided on the reinforced diaphragm, and a protrusion is provided on the outer circumferential surface of the reinforced diaphragm.

[0010] As a preferred solution of the sound pressure sensor described in the present invention, the depth of the groove is set as the groove depth, the radius of the reinforced diaphragm is set as the outer circle radius, the groove is coaxially arranged with the reinforced diaphragm, and the radius is set as the inner circle radius.

[0011] As a preferred solution of the sound pressure sensor described in the present invention, wherein: the sensor includes a sensor antenna arranged on the sensor mounting plate, and a sensor chip arranged on the sensor antenna; the reinforcing diaphragm is arranged on the sound pressure sensing surface of the sensor chip.

[0012] As a preferred solution of the sound pressure sensor of the present invention, the side unfolded plan view of the reinforced diaphragm is a rectangle, and the height of the reinforced diaphragm is the height.

[0013] As a preferred solution of the sound pressure sensor of the present invention, wherein: the diagonal angle is set to 90°; the edge angle is set to 45°.

[0014] As a preferred solution of the sound pressure sensor of the present invention, the distance between two adjacent groups of sensors arranged on the sensor mounting plate is a spacing.

[0015] Beneficial effects of the first embodiment of the present invention: The present invention arranges the piezoelectric sensing units according to the shape, so that the distance and angle between each sensing unit are optimized, ensuring the overall sensitivity and directionality of the sensor. The structural design allows sound waves to be effectively detected and transmitted in multiple directions, greatly improving the detection range and sensitivity of the sensor. By adopting the design of a grooved diaphragm and a diaphragm with an outer circular protrusion, the deformation amount of the diaphragm under sound pressure excitation is increased, thereby increasing the cavity length change and the output light intensity change amplitude, significantly improving the sensor's conversion ability and sensitivity to sound signals.

[0016] In view of the above problems existing in the existing optoelectronic signal transmission system, a second embodiment of the present invention is proposed.

[0017] Therefore, the present invention provides an optoelectronic signal transmission system, the purpose of which is to solve the technical problem that the prior art requires complex signal processing algorithms and hardware support, which not only increases the complexity of the system, but also puts higher requirements on the performance of the processor, further increasing the cost and energy consumption of the equipment.

[0018] To solve the above technical problems, the present invention provides the following technical solutions: an optoelectronic signal transmission system, the above sound pressure sensor; a sensing unit provided with the sensor body unit; and a photoelectric conversion unit provided on one side of the sensing unit.

[0019] As a preferred solution of the photoelectric signal transmission system of the present invention, wherein: the sensing unit comprises a sensing sheet provided with the sensor body unit, FP vibration cavities provided on both sides of the sensing sheet, and a signal conditioner provided on the sensor body unit;

[0020] The photoelectric conversion unit includes a fixed base arranged on one side of the FP vibration cavity, a quartz sleeve arranged on the fixed base, and an optical fiber channel arranged on the quartz sleeve and located in the middle of the FP vibration cavity.

[0021] Beneficial effects of the second embodiment of the present invention: The present invention adopts a photodiode and a photoelectric conversion module to perform signal processing in a light vibration signal mode, which can effectively reduce the manufacturing cost of the sensor. The sensing sheet acquires the vibration signal, the FP vibration cavity acquires the resonance signal, the optical fiber pipe emits a laser inward, and the reflected laser vibration signal is received by the photoelectric conversion unit. The photoelectric conversion unit converts the light vibration signal into an electrical signal and sends it to the photoelectric processing circuit for analysis and processing. This design improves the signal detection efficiency and accuracy of the sensor. The use of quartz sleeves and optical signal processing greatly enhances the anti-interference ability and environmental adaptability of the sensor. The quartz sleeve provides additional protection, enabling the sensor to maintain stable operation in various complex environments and reducing the impact of environmental noise on the detection results. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0023] Figure 1Schematic diagram of the overall structure of the sound pressure sensor of the present invention.

[0024] Figure 2 It is a schematic top view of the reinforced diaphragm in the sound pressure sensor of the present invention.

[0025] Figure 3 It is a cross-sectional view of the reinforced diaphragm in the sound pressure sensor of the present invention.

[0026] Figure 4 It is a schematic diagram of the structure of the photoelectric signal transmission system of the present invention.

[0027] Figure 5 It is the front view of the photoelectric signal transmission system of the present invention.

[0028] Figure 6 It is a partial schematic diagram of the photoelectric signal transmission system of the present invention.

[0029] Figure 7 It is a schematic diagram of the sensor light intensity signal oscillation curve with respect to the cavity length of the present invention. DETAILED DESCRIPTION

[0030] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.

[0031] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0032] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor is it an embodiment that is mutually exclusive with other embodiments, either individually or selectively.

[0033] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0034] Example 1, reference Figure 1 , which is a first embodiment of the present invention, provides a sound pressure sensor,

[0035] The sensor body unit 100 includes a sensor mounting plate 101 and a sensor 102 disposed on the sensor mounting plate 101 .

[0036] Among them, the sensor mounting plate 101 is set to a quadrilateral, and two diagonals are set on its surface, one of which is set to direction one m, and the other diagonal is set to direction two n, the angle between direction one m and direction two n is set to diagonal angle A, and the angle between direction one m and the edge of the sensor mounting plate 101 is set to edge angle B; the sensors 102 are evenly distributed on the sensor mounting plate 101 along direction one m and direction two n.

[0037] Furthermore, the distance between two adjacent groups of sensors 102 arranged on the sensor mounting plate 101 is a spacing X. The spacing X is designed according to the specific sound field environment to be detected. When it is necessary to monitor and sense a complex sound environment, the spacing X is reduced so that the sensors 102 are closely arranged on the sensor mounting plate 101. Conversely, when the sound field of the environment to be detected is relatively simple, the spacing X is increased so that the number of sensors 102 per unit area of ​​the sensor mounting plate 101 is small, thereby reducing the energy consumption of the sound pressure sensor while ensuring sound pressure monitoring.

[0038] Preferably, the diagonal angle A is set to 90°; the edge angle B is set to 45°. The sensors 102 are arranged in an x ​​shape on the sensor mounting plate 101, so that the distance and angle between each sensor 102 are optimized to ensure the overall sensitivity and directionality of the sensor 102. According to the distribution of the above sensors 102 on the sensor mounting plate 101, x-shaped distributed arrangement sensors and traditional dot matrix sensors are set to detect 75 decibel stable sound sources at different sound source positions and sound source directions, and the following experimental data are obtained.

[0039]

[0040] As can be seen from the above table, through structural optimization, the sensitivity and detection range of the sound pressure sensor with an x-shaped distribution arrangement have been improved compared to the traditional dot matrix sensor. The sensors 102 are arranged in an x ​​shape so that the distance and angle between each sensor 102 are optimized, ensuring the overall sensitivity and directionality of the sensor body unit 100. The design of the x structure allows sound waves to be effectively detected and conducted in multiple directions of the sensor body unit 100, greatly improving the detection range and sensitivity of the sensor body unit 100. In addition, since the number of sensors 102 per unit area of ​​the sound pressure sensor with an x-shaped distribution arrangement is less than that of the traditional dot matrix sensor, the power consumption of the sound pressure sensor with an x-shaped distribution arrangement is also improved.

[0041] Example 2, reference Figure 1-Figure 3, which is the second embodiment of the present invention. This embodiment is different from the first embodiment in that the sensor body unit 100 also includes a reinforcing membrane 103 arranged on the sensor 102.

[0042] Compared with Example 1, further, the reinforcing diaphragm 103 is set as a circular diaphragm, a groove 103a is provided on the reinforcing diaphragm 103, and a protrusion 103b is provided on the outer circumferential surface of the reinforcing diaphragm 103. The design of the groove 103a increases the deformation amount of the diaphragm under the excitation of sound pressure, thereby increasing the change amount of the cavity length and the change amplitude of the output light intensity, significantly improving the conversion ability and sensitivity of the sensor 102 to the sound signal, and the design of the protrusion 103b also increases the deformation amount of the diaphragm under the excitation of sound pressure, further improving the detection accuracy of the sensor 102.

[0043] Preferably, the depth of the groove 103a is set to the groove depth d, the radius of the reinforced diaphragm 103 is set to the outer circle radius R, the groove 103a is coaxially arranged with the reinforced diaphragm 103, and the radius is set to the inner circle radius r. The side unfolded plan view of the reinforced diaphragm 103 is a rectangle, and the height of the reinforced diaphragm 103 is the height H. The size of the groove depth d is relative to the size of one-third of the height H. In actual application environment, the ratio of the groove depth d and the height H is determined according to the volume decibel of the sound field. When the volume decibel of the sound field is large, the ratio of the groove depth d and the height H can be reduced, thereby extending the service life of the reinforced diaphragm 103. Conversely, when the volume decibel of the sound field is high, the ratio of the groove depth d and the height H can be increased, thereby increasing the deformation of the reinforced diaphragm 103 under sound pressure excitation, and further improving the detection accuracy of the sensor 102.

[0044] Furthermore, the sensor 102 includes a sensor antenna 102b disposed on the sensor mounting plate 101, and a sensor chip 102a disposed on the sensor antenna 102b; and the reinforcing diaphragm 103 is disposed on the sound pressure sensing surface of the sensor chip 102a.

[0045] During use, when subjected to the same magnitude of acoustic signal, the greater the deformation of the reinforced diaphragm 103, the greater the change in its cavity length, and the greater the corresponding output light intensity change amplitude, that is, the stronger the sensor's ability to convert acoustic signals. Therefore, reinforcing the deformation of the diaphragm 103 under acoustic pressure excitation is an effective method to improve the acoustic pressure sensitivity of the diaphragm type. The design of the reinforced diaphragm 103 is performed to improve the sensitivity of the acoustic pressure sensor 102. By adopting the design of the grooved diaphragm and the cylindrical diaphragm, the deformation of the diaphragm under acoustic pressure excitation is increased, thereby increasing the change in cavity length and the change amplitude of the output light intensity, significantly improving the sensor's ability to convert acoustic signals and sensitivity.

[0046] The remaining structures are the same as those of Example 1.

[0047] Example 3, reference Figure 1-Figure 7 , which is the third embodiment of the present invention, provides a photoelectric signal transmission system, including the sound pressure sensor in the above embodiment, a sensing unit 200 provided with a sensor body unit 100; and a photoelectric conversion unit 300 arranged on one side of the sensing unit 200.

[0048] Further, the sensor unit 200 includes a sensor sheet 201 provided with the sensor body unit 100, FP vibration cavities 202 provided on both sides of the sensor sheet 201, and a signal conditioner 203 provided on the sensor body unit 100;

[0049] Preferably, the photoelectric conversion unit 300 includes a fixed base 303 disposed on one side of the FP vibration cavity 202, a quartz sleeve 302 disposed on the fixed base 303, and an optical fiber channel 301 disposed on the quartz sleeve 302 and located in the middle of the FP vibration cavity 202. The use of the quartz sleeve and optical signal processing greatly enhances the anti-interference ability and environmental adaptability of the sensor 102. The quartz sleeve 302 provides additional protection, enabling the sensor 102 to maintain stable operation in various complex environments, reducing the impact of environmental noise on the detection results.

[0050] During use, the photoelectric conversion unit 300 mainly uses the sensing sheet 201 at the top of the photoelectric conversion system to obtain vibration signals, the adjacent FP vibration cavity 202 obtains resonance signals, and the middle optical fiber pipe 301 emits laser inward, the laser vibration is reflected, and the corresponding optical vibration signal is obtained, which is transmitted back to the photoelectric conversion unit 300, and the photoelectric conversion unit 300 sends it to the photoelectric processing circuit. The external fixed part of the optical fiber pipe 301 is a quartz sleeve 302, and the quartz sleeve 302 is fixed by a fixed base 303. Among them, the diaphragm at the top of the sensor body unit 100 adopts a groove reinforced diaphragm 103. When the obtained vibration signal acts on the sensing sheet 201, it will cause the reinforced diaphragm 103 to vibrate with increased amplitude, and then cause the cavity length to oscillate and change within the linear range of the reflection spectrum. In the efficient signal detection process of the sensor 102, the sensing sheet 201 obtains the vibration signal, the FP vibration cavity 202 obtains the resonance signal, the signal conditioner 203 receives and adjusts the resonance signal, and forms a sound wave with a stable frequency to be obtained by the FP vibration cavity 202, the optical fiber pipe 301 emits a laser inward, and the reflected laser vibration signal is received by the photoelectric conversion unit. The photoelectric conversion unit 300 converts the optical vibration signal into an electrical signal and sends it to the photoelectric processing circuit for analysis and processing. This design improves the signal detection efficiency and accuracy of the sensor 102. Photodiodes and photoelectric conversion modules are used for signal processing, and the signal processing process is simplified through the optical vibration signal mode, which reduces the dependence on high-performance processors, improves signal processing efficiency, and reduces system complexity.

[0051] exist Figure 7 In the figure, AB is the linear interval of the reflection spectrum, Q is the orthogonal working point, when the cavity length changes within the range AB, the change in output light intensity has a good linear relationship with the change in cavity length, and the change in cavity length can be obtained by measuring the change in light intensity. The cavity length design can be selected based on the oscillation curve.

[0052] Importantly, it should be noted that the construction and arrangement of the present application shown in a plurality of different exemplary embodiments are only exemplary. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and proportion of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, directional changes, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, the element shown as integrally formed can be composed of multiple parts or elements, the position of the element can be inverted or otherwise changed, and the nature or number or position of the discrete element can be changed or changed. Therefore, all such modifications are intended to be included in the scope of the present invention. The order or sequence of any process or method steps can be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and is not only structurally equivalent but also equivalent structure. Without departing from the scope of the present invention, other replacements, modifications, changes and omissions can be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the invention is not limited to a specific embodiment, but extends to numerous modifications still falling within the scope of the appended claims.

[0053] Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention) may not be described.

[0054] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A sound pressure sensor, characterized in that: include, A sensor body unit (100) comprises a sensor mounting plate (101) and a sensor (102) arranged on the sensor mounting plate (101); The sensor mounting plate (101) is configured as a quadrilateral, and two diagonal lines are configured on its surface, wherein one of the diagonal lines is configured as direction one (m), and the other of the diagonal lines is configured as direction two (n), and the angle between the direction one (m) and the direction two (n) is configured as a diagonal angle (A), and the angle between the direction one (m) and the edge of the sensor mounting plate (101) is configured as an edge angle (B); The sensors (102) are evenly distributed on the sensor mounting plate (101) along the direction one (m) and the direction two (n).

2. The sound pressure sensor according to claim 1, characterized in that: The sensor body unit (100) further comprises a reinforcing membrane (103) arranged on the sensor (102).

3. The sound pressure sensor according to claim 2, characterized in that: The reinforcing diaphragm (103) is configured as a circular diaphragm, a groove (103a) is provided on the reinforcing diaphragm (103), and a protrusion (103b) is provided on the outer circumferential surface of the reinforcing diaphragm (103).

4. The sound pressure sensor according to claim 3, characterized in that: The depth of the groove (103a) is set to the groove depth (d), the radius of the reinforcing diaphragm (103) is set to the outer circle radius (R), the groove (103a) and the reinforcing diaphragm (103) are coaxially arranged, and the radius is set to the inner circle radius (r).

5. The sound pressure sensor according to claim 4, characterized in that: The sensor (102) comprises a sensor antenna (102b) arranged on the sensor mounting plate (101), and a sensor chip (102a) arranged on the sensor antenna (102b); the reinforcing diaphragm (103) is arranged on the sound pressure sensing surface of the sensor chip (102a).

6. The sound pressure sensor according to claim 5, characterized in that: The side unfolded plan view of the reinforcing membrane (103) is a rectangle, and the height of the reinforcing membrane (103) is the height (H).

7. The sound pressure sensor according to claim 6, characterized in that: The diagonal angle (A) is set to 90°; the edge angle (B) is set to 45°.

8. The sound pressure sensor according to any one of claims 1 to 7, characterized in that: The distance between two adjacent groups of sensors (102) arranged on the sensor mounting plate (101) is a spacing (X).

9. A photoelectric signal transmission system, characterized in that: include, The sound pressure sensor according to claim 8; A sensing unit (200) provided with the sensor body unit (100); and A photoelectric conversion unit (300) is arranged on one side of the sensing unit (200).

10. The photoelectric signal transmission system according to claim 9, characterized in that: The sensing unit (200) comprises a sensing sheet (201) provided with the sensor body unit (100), FP vibration cavities (202) provided on both sides of the sensing sheet (201), and a signal conditioner (203) provided on the sensor body unit (100); The photoelectric conversion unit (300) comprises a fixed base (303) arranged on one side of the FP vibration cavity (202), a quartz sleeve (302) arranged on the fixed base (303), and an optical fiber channel (301) arranged on the quartz sleeve (302) and located in the middle of the FP vibration cavity (202).

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