CN113804281A

CN113804281A - Sound wave vibration measuring device based on F-P optical fiber Fabry-Perot sensing principle

Info

Publication number: CN113804281A
Application number: CN202110885148.8A
Authority: CN
Inventors: 张嘉伟; 付庚; 王力; 陈驰
Original assignee: Xian University of Technology
Current assignee: Xian University of Technology
Priority date: 2021-08-03
Filing date: 2021-08-03
Publication date: 2021-12-17

Abstract

The invention discloses a sound wave vibration measuring device based on the F-P optical fiber Faber sensing principle, comprising a vibration sensing device, the vibration sensing device is connected with an optical fiber demodulator, and the optical fiber demodulator is connected with a computer; the vibration sensing device is connected with a computer; The device includes a steel sheet, the bottom end of the steel sheet is connected with one end of the spring, the other end of the spring is connected with one side of the piezoelectric ceramic, the piezoelectric ceramic is sleeved on the top of the plastic sleeve, and the interior of the plastic sleeve is provided with ceramic pins , the end of the ceramic pin away from the piezoelectric ceramic is connected with a single-mode optical fiber, the single-mode optical fiber passes through the bottom of the plastic sleeve, and the single-mode optical fiber is connected with an optical fiber demodulator. The sound wave vibration measurement of the invention solves the problems of low sensitivity, poor anti-interference ability and poor measurement accuracy of the prior art for measuring vibration energy signals.

Description

Sound wave vibration measuring device based on F-P optical fiber Fabry-Perot sensing principle

Technical Field

The invention belongs to the technical field of optical fiber sensing, and relates to a sound wave vibration measuring device based on an F-P optical fiber Fabry-Perot sensing principle.

Background

With the rapid development of modern industry, the application of modern testing technology in various fields such as physics, chemistry, biology, machinery and the like has started to develop towards digitization and informatization. However, at the very front of the test sensing system is the sensor, at a location at the core of the overall test system. The accuracy, response degree, anti-interference performance and the like of the sensor directly influence the accuracy of the detection result. In recent years, sound wave vibration detection becomes one of the research hotspots in the intelligent sensing detection industry, and the traditional sound wave detection technology mainly uses an electronic microphone with a sound-electricity transduction principle to transmit and detect sound signals, and has the main defects of poor anti-interference capability, high loss, easy electromagnetic interference, incapability of long-distance transmission and the like. In the field of optical sensing, the acoustic vibration signals are detected by utilizing the advantages of passivity, high precision, strong anti-interference capability and the like of an optical detection technology, and the acoustic vibration signal detection method is applied to the fields of underwater weapon testing, oil pipeline safety early warning, marine geological investigation, oil exploration and the like.

Disclosure of Invention

The invention aims to provide a sound wave vibration measuring device based on an F-P optical fiber Fabry-Perot sensing principle, and solves the problems of low sensitivity, poor anti-interference capability and poor measuring precision of vibration energy signal measurement in the prior art.

The invention adopts the technical scheme that the sound wave vibration measuring device based on the F-P optical fiber Fabry-Perot sensing principle comprises a vibration sensing device, wherein the vibration sensing device is connected with an optical fiber demodulator, and the optical fiber demodulator is connected with a computer;

vibration sensing device includes the steel sheet, and the bottom of steel sheet is connected with the one end of spring, and the other end and a side of piezoceramics of spring are connected, and the telescopic top of plastics is located to the piezoceramics cover, and the inside ceramic contact pin that is provided with of plastics sleeve, the one end that piezoceramics was kept away from to the ceramic contact pin are connected with single mode fiber, and single mode fiber wears out the telescopic bottom of plastics, and single mode fiber is connected with the optical fiber demodulation appearance.

The present invention is also characterized in that,

the steel sheet, the spring, the piezoelectric ceramics, the plastic sleeve and the ceramic contact pin are coaxially arranged.

The distance between the side face of the piezoelectric ceramic far away from the spring and the end face of the ceramic contact pin far away from the single-mode optical fiber is 0.5mm +/-0.1 mm.

The steel sheet had a length of 20mm, a height of 40mm and a thickness of 0.2 mm.

The diameter of the spring is 4mm, and the height of the spring in a natural state is 10 mm.

The plastic sleeve has an inner diameter of 18mm, an outer diameter of 19mm and a length of 25 mm.

The diameter of the piezoelectric ceramic is equal to the inner diameter of the plastic sleeve.

The beneficial effect of the invention is that,

(1) according to the acoustic wave vibration measuring device based on the F-P optical fiber Fabry-Perot sensing principle, mechanical energy is converted into optical signals based on the F-P optical fiber Fabry-Perot sensing principle, and the conversion from the optical signals to electric signals is completed through the optical fiber demodulator, so that the detection sensitivity and the anti-interference capability are greatly improved, and the detection accuracy is enhanced;

(2) the sound wave vibration measuring device based on the F-P optical fiber Fabry-Perot sensing principle does not need an external excitation power supply in the detection process, so that the purpose of passive detection is achieved.

Drawings

FIG. 1 is a schematic structural diagram of an acoustic vibration measuring device based on F-P optical fiber Fabry-Perot sensing principle;

FIG. 2 is a schematic structural diagram of a vibration sensing device in a sonic vibration measuring device based on F-P optical fiber Fabry-Perot sensing principle;

FIG. 3 is a side view of a vibration sensing device in an acoustic vibration measuring device based on F-P fiber Fabry-Perot sensing principle;

fig. 4 is a top view of a vibration sensing device in an acoustic vibration measuring device based on the F-P fiber fabry perot sensing principle.

In the figure, 1, a steel sheet, 2, a spring, 3, piezoelectric ceramics, 4, a plastic sleeve, 5, a ceramic pin, 6, a single mode fiber, 7, an optical fiber demodulator, 8, a computer and 9, a vibration sensing device.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

The invention provides a sound wave vibration measuring device based on F-P optical fiber Fabry-Perot sensing principle, which has a structure shown in figure 1 and comprises a vibration sensing device 9, wherein the vibration sensing device 9 is connected with an optical fiber demodulator 7, and the optical fiber demodulator 7 is connected with a computer 8;

as shown in fig. 2, 3 and 4, the vibration sensing device 9 includes a steel sheet 1 with a length of 20mm, a height of 40mm and a thickness of 0.2mm, a bottom midpoint position of the steel sheet 1 is connected with one end of a spring 2, the steel sheet 1 is used as a sound wave sensing vibrator, the spring 2 is used as a vibrator connecting rod, the other end of the spring 2 is connected with a center of a side face of a piezoelectric ceramic 3, a diameter of the spring 2 is 4mm, a height of the spring in a natural state is 10mm, the piezoelectric ceramic 3 is sleeved on a top end of a transparent plastic sleeve 4, a diameter of the piezoelectric ceramic 3 is equal to an inner diameter of the plastic sleeve 4, a ceramic ferrule 5 is arranged inside the plastic sleeve 4, one end of the ceramic ferrule 5, which is far away from the piezoelectric ceramic 3, is connected with a single-mode fiber 6 to form an F-P fiber Fabry-Perot cavity, a distance between the side face of the piezoelectric ceramic 3, which is far away from the spring 2, and an end face of the ceramic ferrule 5, which is far away from the single-mode fiber 6 is 0.5mm +/-0.1 mm, single mode fiber 6 wears out the bottom of plastic sleeve 4, and the internal diameter of plastic sleeve 4 is 18mm, and the external diameter is 19mm, and length is 25mm, and single mode fiber 6 is connected with optical fiber demodulator 7, spring 2, plastic sleeve 4, the coaxial setting of ceramic contact pin 5.

The invention relates to a preparation method of a sound wave vibration measuring device based on F-P optical fiber Fabry-Perot sensing principle, which is implemented according to the following steps:

step 1, welding the bottom of a steel sheet 1 with the length of 20mm, the height of 40mm and the thickness of 0.2mm with a spring 2 with the diameter of 4mm and the height of 10mm in a natural state, wherein the spring 2 is connected to the middle point of the bottom of the steel sheet 1;

step 2, welding one end of the spring 2, which is far away from the steel sheet 1, with the center of the circle of the piezoelectric ceramic 3, and transmitting the induced sound wave vibration signal to the piezoelectric ceramic 3 through the steel sheet 1 and the spring 2, so that the piezoelectric ceramic 3 generates mechanical deformation;

step 3, fixing the piezoelectric ceramic 3 at the opening end of a transparent plastic sleeve 4 with the inner diameter of 18mm, the outer diameter of 19mm and the length of 25mm, wherein a ceramic pin 5 is arranged inside the plastic sleeve 4, the distance between one end face of the ceramic pin 5 and the end face of the piezoelectric ceramic 3 is 0.5mm +/-0.1 mm, the other end face of the ceramic pin 5 is fixedly connected with a single-mode optical fiber 6 to form an optical fiber Fabry-Perot cavity, the single-mode optical fiber 6 penetrates through the bottom of the plastic sleeve 4, and the mechanical deformation generated by the piezoelectric ceramic 3 is collected into an optical signal through the interference of optical light of the F-P optical fiber Fabry-Perot cavity;

and 4, connecting the single-mode optical fiber 6 with an optical fiber demodulator 7, converting the acquired optical signal into an electric signal, transmitting the electric signal to a computer 8 for analysis, and displaying the intensity of the vibration signal of the reaction sound wave through a waveform to realize sensing and detection of the vibration signal.

The working process of the acoustic wave vibration measuring device based on the F-P optical fiber Fabry-Perot sensing principle comprises the following steps: the induced sound wave vibration signal is transmitted to the piezoelectric ceramic 3 through the steel sheet 1 and the spring 2, the piezoelectric ceramic 3 is mechanically deformed, the mechanical deformation generated by the piezoelectric ceramic 3 is converted into an optical signal through the interference of F-P optical fiber Fabry-Perot cavity light, the optical signal is transmitted to the optical fiber demodulator 7 through the single-mode optical fiber 6, the optical signal acquired by the optical fiber demodulator 7 is converted into an electric signal and transmitted to the computer 8 for analysis, the intensity of the sound wave vibration signal is reflected through waveform display, and the sensing and the detection of the vibration signal are realized.

Claims

1. a sound wave vibration measuring device based on F-P optical fiber method Perel sensing principle, is characterized in that, comprises vibration sensing device (9), and described vibration sensing device (9) is connected with optical fiber demodulator (7), The optical fiber demodulator (7) is connected with a computer (8);

The vibration sensing device (9) comprises a steel sheet (1), the bottom end of the steel sheet (1) is connected to one end of the spring (2), and the other end of the spring (2) is connected to the piezoelectric ceramic (3) ), the piezoelectric ceramic (3) is sleeved on the top of the plastic sleeve (4), the plastic sleeve (4) is provided with a ceramic pin (5), and the ceramic pin ( 5) A single-mode optical fiber (6) is connected to one end away from the piezoelectric ceramic (3), the single-mode optical fiber (6) passes through the bottom of the plastic sleeve (4), and an optical fiber is connected to the single-mode optical fiber (6) demodulator (7).

2. A kind of acoustic vibration measuring device based on F-P optical fiber Faber sensing principle according to claim 1, is characterized in that, described steel sheet (1), spring (2), piezoelectric ceramics (3), plastic The sleeve (4) and the ceramic pin (5) are coaxially arranged.

3. a kind of acoustic vibration measuring device based on F-P optical fiber Fa-Per sensing principle according to claim 1, is characterized in that, described piezoelectric ceramic (3) is far away from the side surface of spring (2) and ceramic pin (5) ) away from the distance between the end faces of the single-mode optical fiber (6) is 0.5mm±0.1mm.

4 . The acoustic wave vibration measuring device based on the F-P optical fiber method according to claim 1 , wherein the steel sheet ( 1 ) is 20 mm long, 40 mm high and 0.2 mm thick. 5 .

5 . The acoustic vibration measuring device based on the F-P optical fiber method according to claim 1 , wherein the spring ( 2 ) has a diameter of 4 mm and a height of 10 mm in a natural state. 6 .

6. a kind of acoustic wave vibration measuring device based on F-P optical fiber Faber sensing principle according to claim 1, is characterized in that, the inner diameter of described plastic sleeve (4) is 18mm, outer diameter is 19mm, length is 25mm .

7 . The acoustic vibration measuring device based on the F-P optical fiber Faber sensing principle according to claim 1 , wherein the diameter of the piezoelectric ceramic ( 3 ) is equal to the inner diameter of the plastic sleeve ( 4 ). 8 .