CN212134870U - Optical fiber double-Fabry-Perot cavity ultrasonic sensor for partial discharge detection - Google Patents
Optical fiber double-Fabry-Perot cavity ultrasonic sensor for partial discharge detection Download PDFInfo
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- CN212134870U CN212134870U CN202020650643.1U CN202020650643U CN212134870U CN 212134870 U CN212134870 U CN 212134870U CN 202020650643 U CN202020650643 U CN 202020650643U CN 212134870 U CN212134870 U CN 212134870U
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Abstract
The utility model relates to an optical fiber double Fabry-Perot cavity ultrasonic sensor for partial discharge detection, which comprises a light source, an optical fiber 1/2 optical splitter, an optical fiber coupler, an optical fiber EFPI double Fabry-Perot cavity probe, a double-way photoelectric detector and a high-speed data acquisition device; the light source is connected with the optical fiber coupler through the optical fiber 1/2 optical splitter, the optical fiber coupler is respectively connected with the optical fiber EFPI double Fabry-Perot cavity probe and the double-path photoelectric detector, and the double-path photoelectric detector is connected with the high-speed data acquisition device. Compared with the prior art, the utility model has the advantages of the interference deviation that system and external environment formed to the fabry-perot chamber during operation has been eliminated.
Description
Technical Field
The utility model relates to a sensor is used in partial discharge detection, especially relate to a partial discharge detects with two Fabry-Perot's chamber ultrasonic sensor of optic fibre.
Background
At present, an Extrinsic Fabry-Perot Interferometer (EFPI) sensor method, i.e., an optical fiber EFPI sensor, has been widely researched and applied to ultrasonic signal detection and positioning of Partial Discharge (PD) occurring in internal insulation defects of electrical equipment, such as transformers and gas insulated switchgear.
The optical fiber EFPI sensor is a high-performance ultrasonic signal detection system which converts ultrasonic waves into mechanical vibration by using a sensitive diaphragm structure, converts the mechanical vibration into optical parameter change by using a Fabry-Perot interference technology, and finally converts, acquires and demodulates the optical parameter change by using a photoelectric detector and other related components. The conventional optical fiber EFPI sensor principle is shown in fig. 1: light emitted by the light source enters a Fabry-Perot cavity consisting of an optical fiber end face (reflection end face 1) and a sensitive diaphragm (reflection end face 2) through an optical fiber and a coupler (circulator), is reflected back to the optical fiber after Fabry-Perot interference occurs in the Fabry-Perot cavity, is converted into a voltage signal by a photoelectric detector through the optical fiber coupler, and is stored, analyzed and displayed after being collected by the high-speed data collecting device. When the sensitive membrane structure is excited by ultrasonic waves to vibrate, the cavity length of the Fabry-Perot is changed, the interference light intensity of the Fabry-Perot is finally changed or the interference peak wavelength is shifted, and the sound wave signal acting on the sensitive membrane structure can be recovered by collecting the change of the light intensity of reflected light or the shift of the peak wavelength.
However, the existing sensor system has the problems of stable measuring range and working point, because the light intensity demodulation has the characteristics of low cost, high response speed and the like, the existing research and application select the light intensity demodulation as a signal reply mode of the EFPI sensor, the measurement accuracy of the sensor is reduced due to the influence of power fluctuation of a light source, bending loss of an optical fiber, environmental temperature change, aging of a detector and the like, and the 'static working point' can drift, so that self-compensation measures are required to be adopted to ensure the stability of the working point, and the interference deviation formed when the system and the external environment work on the Fabry-Perot cavity is eliminated.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing an optical fiber double Fabry-Perot cavity ultrasonic sensor for partial discharge detection in order to overcome the defects of the prior art.
The purpose of the utility model can be realized through the following technical scheme:
an optical fiber double Fabry-Perot cavity ultrasonic sensor for partial discharge detection comprises a light source, an optical fiber 1/2 optical splitter, an optical fiber coupler, an optical fiber EFPI double Fabry-Perot cavity probe, a double-path photoelectric detector and a high-speed data acquisition device; the light source is connected with the optical fiber coupler through the optical fiber 1/2 optical splitter, the optical fiber coupler is respectively connected with the optical fiber EFPI double Fabry-Perot cavity probe and the double-path photoelectric detector, and the double-path photoelectric detector is connected with the high-speed data acquisition device.
Preferably, the optical fiber 1/2 splitter is a fused biconical taper splitter.
Preferably, the optical fiber coupler adopts a standard optical fiber double-branch coupler.
Preferably, the optical fiber EFPI dual Fabry-Perot cavity probe comprises a dual-sensitive diaphragm with a symmetrical structure.
Preferably, the optical fiber EFPI dual-fabry-perot cavity probe further comprises a first optical fiber fixing sheath, a second optical fiber fixing sheath, a first fixing panel and a second fixing panel, wherein the first fixing panel and the second fixing panel are respectively used for fixing the dual-sensitive membrane, and the two optical fibers are respectively inserted into the first optical fiber fixing sheath and the second optical fiber fixing sheath.
Preferably, the optical fiber end face in the first optical fiber fixing sheath is a first reflecting end face, and the opposite sensitive membrane face of the optical fiber is a second reflecting end face.
Preferably, the optical fiber EFPI dual Fabry-Perot cavity probe further comprises a first protection panel and a second protection panel, and the fixed panel, the fixed sheath, the sensitive membrane and the protection panels on the two sides form two closed Fabry-Perot cavities which work independently and have the cavity length of l.
Preferably, the first fixing panel is provided with a through hole for the insulation medium to enter.
Preferably, the double-sensitive membrane is a membrane made of silicon or silicon dioxide material.
Preferably, the optical fiber is a single-mode optical fiber, and the core diameter is 8-10 μm.
Compared with the prior art, the utility model has the advantages of it is following:
1. the optical fiber EFPI double Fabry-Perot cavity probe adopting the double-sensitive diaphragm symmetrical structure has double-channel output, eliminates the interference deviation formed by the system and the external environment when the Fabry-Perot cavity works, ensures that the static working point does not drift, and does not need to adopt self-compensation measures to ensure the stability of the working point.
2. The processing steps of the optical fiber EFPI double Fabry-Perot cavity ultrasonic sensor probe are simple, the double Fabry-Perot cavity probe with the double-sensitive diaphragm symmetrical structure can be manufactured in a modular assembly mode by using a bonding process, and the EFPI double Fabry-Perot cavity ultrasonic sensor probe is suitable for batch production and conversion improvement.
Drawings
FIG. 1 is a schematic diagram of a conventional optical fiber EFPI Fabry-Perot ultrasonic sensor;
FIG. 2 is an enlarged view of portion A of FIG. 1;
FIG. 3 is a schematic diagram of the EFPI optical fiber dual Fabry-Perot cavity ultrasonic sensor for partial discharge detection of the present invention;
FIG. 4 is a schematic structural view of the dual Fabry-Perot cavity ultrasonic sensor probe of the present invention;
FIG. 5 is a schematic end view of an optical fiber EFPI dual Fabry-Perot cavity ultrasonic sensor probe of the present invention;
fig. 6 is a bottom schematic view of the optical fiber EFPI dual fabry-perot cavity ultrasonic sensor probe of the present invention;
fig. 7 is the utility model discloses an optic fibre EFPI dual-Fabry-Perot chamber ultrasonic sensor detects the signal diagram of insulation defect partial discharge under with the different interval distance of source of discharging in transformer oil.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, of the embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall fall within the protection scope of the present invention.
As shown in fig. 3, an optical fiber double-Fabry-Perot cavity ultrasonic sensor for partial discharge detection includes a light source 1, an optical fiber 1/2 optical splitter 2, an optical fiber 4, an optical fiber coupler 3, an optical fiber EFPI double-Fabry-Perot cavity probe 7, a two-way photodetector 5, and a high-speed data acquisition device 6; the light source 1 is connected with the optical fiber coupler 3 through the optical fiber 1/2 optical splitter 2, the optical fiber coupler 3 is respectively connected with the optical fiber EFPI double Fabry-Perot cavity probe 7 and the double-path photoelectric detector 5, and the double-path photoelectric detector 5 is connected with the high-speed data acquisition device 6.
The optical fiber 1/2 optical splitter 2 adopts a fused biconical taper optical splitter to divide the initial light source into 2 paths of light sources to enter the optical fiber coupler.
The optical fiber coupler 3 adopts a standard optical fiber double-branch coupler, two paths of light sources formed by an optical fiber 1/2 optical splitter are incident and enter the optical fiber EFPI double-Fabry-Perot cavity probe, and reflected light interfered by the optical fiber EFPI double-Fabry-Perot cavity probe is sent to a double-path photoelectric detector to be photoelectrically converted into a voltage signal.
As shown in fig. 4, the optical fiber EFPI dual-fabry-perot cavity probe 7 includes a dual sensing diaphragm 71 with a symmetrical structure, the dual-fabry-perot cavity works independently, and the structural parameters, materials and processing techniques of the two sensing diaphragms are the same.
The optical fiber EFPI double Fabry-Perot cavity probe 7 further comprises a first optical fiber fixing sheath 72, a second optical fiber fixing sheath 73, a first fixing panel 74 and a second fixing panel 75, wherein the first fixing panel 74 and the second fixing panel 75 are respectively used for fixing the double sensing diaphragms 71, and the two optical fibers 4 are respectively inserted into the first optical fiber fixing sheath 72 and the second optical fiber fixing sheath 73.
The end face of the optical fiber in the first optical fiber fixing sheath is a first reflecting end face 76, and the opposite sensitive membrane face of the optical fiber is a second reflecting end face 77.
As shown in fig. 5 and 6, the optical fiber EFPI dual-fabry-perot cavity probe further includes a first protection panel 791 and a second protection panel 792, and the fixing panel, the fixing sheath, the sensitive membrane and the protection panels on both sides form two closed fabry-perot cavities 78 which work independently and have a cavity length of l. The first fixing panel 74 is provided with a through hole 741 for entering an insulating medium, and the insulating medium (the transformer is insulating oil) of the electrical equipment enters the probe through the through hole on the probe end fixing panel 1 and simultaneously acts on the two symmetrically distributed sensitive diaphragms.
The mechanical working characteristics of the optical fiber EFPI double Fabry-Perot cavity probe are determined by the equivalent length a and the membrane thickness h of the two sensitive membranes and the characteristics of an electrical equipment insulating medium (a transformer is insulating oil) entering the probe through the through hole. According to the principle of multi-beam interference, the reflected light intensity I of two Fabry-Perot cavities1(lambda) and I2(λ) can be expressed as:
in the formula: i is0(λ) is the intensity of the incident light at wavelength λ; n is the refractive index of the medium in the Fabry-Perot cavity; r1And R2Is two reflecting end faces 1 and 1 shown in FIG. 22, reflectance of the film; l is the length of the Fabry-Perot cavity; delta I1And Δ I2The comprehensive interference deviation formed when the system and the external environment work on the two Fabry-Perot cavities is solved.
The two sensitive membranes in the optical fiber EFPI double Fabry-Perot cavity probe can be made of silicon or silicon dioxide materials, the MEMS technology is utilized, according to the frequency range of an electrical device PD ultrasonic signal of 20 kHz-500 kHz, the membrane thickness h is processed to be several mu m to dozens of mu m, the equivalent length a is processed to be dozens of mu m to hundreds of mu m, and the surface of the sensitive membrane opposite to the end face of the optical fiber, namely the reflecting end face 2, can be plated with gold to improve the reflectivity.
The Fabry-Perot cavity in the optical fiber EFPI double Fabry-Perot cavity probe is long, and design parameters can be selected to be hundreds of micrometers according to the sensitivity of reflected light intensity I (lambda).
The EFPI dual Fabry-Perot cavity probe is characterized in that a first optical fiber fixing sheath, a second optical fiber fixing sheath, a first fixing panel, a second fixing panel, a first protection panel and a second protection panel are formed in the optical fiber EFPI dual Fabry-Perot cavity probe, and because the EFPI sensor is a built-in sensor, in order to avoid the influence on an electric field in electrical equipment, insulating materials such as epoxy resin are adopted.
The optical fiber is a common single-mode optical fiber, the core diameter is 8-10 mu m, and the working wavelength lambda region is as follows: 1300-1600 nm.
The processing steps of the optical fiber EFPI double Fabry-Perot cavity probe are as follows:
step 1: bonding and assembling the first optical fiber fixing sheath and the second optical fiber fixing sheath by using an adhesive to form two fixing sheath assembly parts A; two sensitive membranes are inserted into the positioning holes in the second fixing panel and are fixed by using an adhesive to form a combined component B;
step 2: respectively inserting optical fibers into the two fixed sheath assemblies A, wherein the end faces of the optical fibers are flush with the side face of the first fixed sheath, so that the length l of the Fabry-Perot cavity after final assembly reaches a design value;
and step 3: symmetrically bonding and assembling the assembly B and the two fixed sheath assemblies A formed in the step 2 after the optical fiber is inserted by using an adhesive to form an assembly C;
and 4, step 4: inserting the other ends of the two sensitive diaphragms into the positioning hole in the first fixing panel by using an adhesive, fixing the other ends of the two sensitive diaphragms by using the adhesive, and adhering and assembling the other ends of the two sensitive diaphragms with the assembly C formed in the step 3;
and 5: and 4, carrying out bonding assembly on the protective panels on the two sides and the assembly C formed in the step 4 by using a bonding agent to complete the Fabry-Perot cavity sealing of the optical fiber EFPI double Fabry-Perot cavity probe.
Fig. 7 is adopting the utility model discloses the optical fiber EFPI dual-Fabry-Perot cavity ultrasonic sensor for partial discharge detection that the method was developed detects the signal diagram of insulation defect partial discharge under with the different spacing distance of source of discharging in transformer oil.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of various equivalent modifications or replacements within the technical scope of the present invention, and these modifications or replacements should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. An optical fiber double Fabry-Perot cavity ultrasonic sensor for partial discharge detection is characterized by comprising a light source, an optical fiber 1/2 optical splitter, an optical fiber coupler, an optical fiber EFPI double Fabry-Perot cavity probe, a double-path photoelectric detector and a high-speed data acquisition device; the light source is connected with the optical fiber coupler through the optical fiber 1/2 optical splitter, the optical fiber coupler is respectively connected with the optical fiber EFPI double Fabry-Perot cavity probe and the double-path photoelectric detector, and the double-path photoelectric detector is connected with the high-speed data acquisition device.
2. The optical fiber double Fabry-Perot cavity ultrasonic sensor for partial discharge detection according to claim 1, wherein the optical fiber 1/2 optical splitter is a fused biconical taper optical splitter.
3. The optical fiber double Fabry-Perot cavity ultrasonic sensor for partial discharge detection according to claim 1, wherein the optical fiber coupler is a standard optical fiber double-branch coupler.
4. The optical fiber double Fabry-Perot cavity ultrasonic sensor for partial discharge detection according to claim 1, wherein the optical fiber EFPI double Fabry-Perot cavity probe comprises a double sensitive diaphragm with a symmetrical structure.
5. The optical fiber double Fabry-Perot cavity ultrasonic sensor for partial discharge detection according to claim 4, wherein the optical fiber EFPI double Fabry-Perot cavity probe further comprises a first optical fiber fixing sheath, a second optical fiber fixing sheath, a first fixing panel and a second fixing panel, the first fixing panel and the second fixing panel are respectively used for fixing the double sensitive diaphragms, and the two optical fibers are respectively inserted into the first optical fiber fixing sheath and the second optical fiber fixing sheath.
6. The optical fiber double Fabry-Perot cavity ultrasonic sensor for partial discharge detection according to claim 5, wherein the optical fiber end face in the first optical fiber fixing sheath is a first reflecting end face, and the opposite sensitive membrane face of the optical fiber is a second reflecting end face.
7. The optical fiber double Fabry-Perot cavity ultrasonic sensor for partial discharge detection according to claim 5, wherein the optical fiber EFPI double Fabry-Perot cavity probe further comprises a first protection panel and a second protection panel, and the fixing panel, the fixing sheath, the sensitive membrane and the protection panels on the two sides form two closed Fabry-Perot cavities which work independently and have the cavity length of l.
8. The optical fiber double Fabry-Perot cavity ultrasonic sensor for partial discharge detection according to claim 5, wherein the first fixing panel is provided with a through hole for the entry of an insulating medium.
9. The optical fiber double Fabry-Perot cavity ultrasonic sensor for partial discharge detection according to claim 4, wherein the double-sensitive diaphragm is made of silicon or silicon dioxide material.
10. The optical fiber double Fabry-Perot cavity ultrasonic sensor for partial discharge detection according to claim 1, wherein the optical fiber is a single-mode optical fiber, and the core diameter is 8-10 μm.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114280436A (en) * | 2021-12-24 | 2022-04-05 | 中国科学院电工研究所 | F-P ultrasonic sensor array implantation device for monitoring partial discharge of power equipment |
| CN115825519A (en) * | 2023-01-05 | 2023-03-21 | 哈尔滨理工大学 | Measurement system of cantilever beam type extrinsic optical fiber double-Fabry-Perot current transformer |
| CN116859080A (en) * | 2023-09-04 | 2023-10-10 | 山东省科学院激光研究所 | Optical fiber wind speed sensing probe, wind speed measuring device and method |
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2020
- 2020-04-26 CN CN202020650643.1U patent/CN212134870U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114280436A (en) * | 2021-12-24 | 2022-04-05 | 中国科学院电工研究所 | F-P ultrasonic sensor array implantation device for monitoring partial discharge of power equipment |
| CN114280436B (en) * | 2021-12-24 | 2024-01-19 | 中国科学院电工研究所 | F-P ultrasonic sensor array implantation device for monitoring partial discharge of power equipment |
| CN115825519A (en) * | 2023-01-05 | 2023-03-21 | 哈尔滨理工大学 | Measurement system of cantilever beam type extrinsic optical fiber double-Fabry-Perot current transformer |
| CN116859080A (en) * | 2023-09-04 | 2023-10-10 | 山东省科学院激光研究所 | Optical fiber wind speed sensing probe, wind speed measuring device and method |
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