CN110608797A - Cylindrical cantilever beam vibration sensor based on double-path DFB fiber laser - Google Patents
Cylindrical cantilever beam vibration sensor based on double-path DFB fiber laser Download PDFInfo
- Publication number
- CN110608797A CN110608797A CN201911040539.9A CN201911040539A CN110608797A CN 110608797 A CN110608797 A CN 110608797A CN 201911040539 A CN201911040539 A CN 201911040539A CN 110608797 A CN110608797 A CN 110608797A
- Authority
- CN
- China
- Prior art keywords
- dfb
- cantilever beam
- optical fibers
- vibration sensor
- fiber laser
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000000835 fiber Substances 0.000 title claims abstract description 25
- 229910052751 metal Inorganic materials 0.000 claims abstract description 52
- 239000002184 metal Substances 0.000 claims abstract description 52
- 239000013307 optical fiber Substances 0.000 claims abstract description 51
- 238000001514 detection method Methods 0.000 claims abstract description 25
- 238000005086 pumping Methods 0.000 claims abstract description 22
- 238000012545 processing Methods 0.000 claims abstract description 10
- 150000002500 ions Chemical class 0.000 claims description 5
- 230000003287 optical effect Effects 0.000 claims description 5
- 229910052691 Erbium Inorganic materials 0.000 claims 1
- -1 erbium ions Chemical class 0.000 claims 1
- 230000035945 sensitivity Effects 0.000 abstract description 19
- 230000007935 neutral effect Effects 0.000 description 10
- 230000008859 change Effects 0.000 description 7
- 230000003247 decreasing effect Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 2
- 206010070834 Sensitisation Diseases 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 230000000875 corresponding effect Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000008313 sensitization Effects 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H3/00—Measuring characteristics of vibrations by using a detector in a fluid
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H9/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means
- G01H9/004—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means using fibre optic sensors
Abstract
The invention discloses a cylindrical cantilever beam vibration sensor based on a double-path DFB optical fiber laser, which mainly solves the problems of low sensitivity, poor directivity and the like of the conventional cylindrical cantilever beam vibration sensor. The optical fiber laser comprises a metal base, two active optical fibers with DFB gratings, a pumping source, two wavelength division multiplexers, a 3dB coupler, two metal clamping blocks, two photoelectric detectors and a signal acquisition and processing end. Two sections of active optical fibers with DFB gratings are fixed together in parallel and are clamped and fixed in a metal base by two metal clamping blocks. And tail fibers of the two active optical fibers with the DFB grating are led out through a small hole on the back of the metal base to perform signal processing and demodulation. The invention realizes high sensitivity and high quality detection of very low frequency signals, avoids the use of core-shifting optical fibers and has simpler structure.
Description
Technical Field
The invention relates to an optical fiber vibration sensor, in particular to a cylindrical cantilever beam vibration sensor based on a Distributed Feedback (DFB) optical fiber laser.
Background
The optical fiber sensor has the characteristics of small volume, light weight, corrosion resistance, high sensitivity and the like, is not easy to be interfered by electromagnetism, and is widely applied to the research field of hydrophones.
Underwater, the only remote transmission currently available is acoustic waves. Underwater early warning, hydrological environment detection, oil exploration and underwater communication are all sound waves used. Because the low-frequency sound wave is further propagated and the loss is lower, especially the very low-frequency (the frequency is below 100 Hz) sound wave is the research focus of underwater sound detection. The traditional optical fiber vibration sensor for underwater acoustic detection mainly comprises two major types, namely a light intensity modulation type and a light phase modulation type, but has strong background noise due to light source fluctuation, optical fiber disturbance, temperature disturbance and the like. Especially the 1/f noise of the light source, greatly affects the low-frequency detection effect and reduces the minimum detectable signal size. The cantilever beam type vibration sensor is one of optical fiber vibration sensors, because the cantilever beam type vibration sensor is miniaturized, and a grating is adopted as a strain sensing structure, the sensing is realized by mainly utilizing the change of the measurement Bragg wavelength, the influence of light source disturbance is basically avoided, the very low frequency detection effect is good, and the cantilever beam type vibration sensor gradually becomes a research hotspot.
There are many kinds of structures of the existing cantilever beam vibration sensor, such as traditional flat plate type beam, cylindrical beam, equal strength beam, hollow beam, suspension back beam, etc. For example, southern university (patent application No. 200420028862.7) measures strain by directly attaching a grating to a flat plate-type beam and measuring the change in the wavelength of the return light.
The cantilever type vibration sensor based on the DFB optical fiber laser is developed on the basis of the traditional cantilever type optical fiber grating sensor. The detection method of the sensor detects the strain of the cantilever beam by measuring the frequency change of the output light of the DFB, and the sensor directly takes the DFB fiber laser as a sensing core, thereby greatly simplifying the structure of the system; the method has the advantages of fiber grating sensing, such as high low-frequency detection sensitivity, low background noise, high precision, large measurement bandwidth and strong reliability.
The main principle of the existing cantilever beam vibration sensor based on the DFB optical fiber laser is that an active optical fiber with a grating is attached to a cantilever beam. According to the document entitled High-resolution distributed-feedback fiber laser based on the Lorentzian published in 2009 at stage 20 of IOP SCIENCE, the strain detection sensitivity of the cantilever beam is positively correlated with the position of the grating to the neutral plane. For a beam that is purely curved (i.e., no twist, no shear), the strain at position x is, according to the formula:
△ε(x)＝±dn·K(x)
wherein d isnRepresents the distance of the point from the neutral axis, k (x) represents the curvature of the point, and ± represents above or below the neutral axis, depending on the direction of vibration. Therefore, for the cantilever beam under the same bending condition, the farther the cantilever beam is away from the neutral axis, the larger the strain is, and the higher the detection sensitivity to the vibration is. For a uniform symmetrical structure, such as a cylinder, the neutral axis is at its geometric centerline; and for the case that the two cylinders are adhered in parallel, the neutral axis is at the midpoint of the connecting line of the centers of the two cylinders. An article entitled "minor design of AcousticVector Sensors Enabled by visco Fluids: Towards Fiber Laser Hair Sensors", published in IEEE SENSORS in 2013 according to Lou, J.W. et al. Compared with a cylindrical cantilever beam vibration sensor which utilizes eccentric optical fiber sensitization (improves the distance between a fiber core and a neutral axis), the flat-type cantilever beam vibration sensor has higher detection sensitivity. And in the directivity test, the directivity of the cylindrical cantilever beam is extremely poor. Resulting in less cylindrical beams in practical applications. But the low-frequency response characteristic of the cylindrical beam structure is relatively flat, the low-frequency sensitivity and the background noise condition are better than those of the traditional optical fiber vibration sensor, and the cylindrical beam structure has a great application prospect. At present, there is no relationThe report of improving the detection sensitivity and the directivity of the cylindrical cantilever beam vibration sensor by utilizing the double-path DFB is provided.
Disclosure of Invention
The invention provides a cylindrical cantilever beam vibration sensor based on a double-path DFB optical fiber laser, which mainly solves the problems of low sensitivity, poor directivity and the like of the conventional cylindrical cantilever beam vibration sensor and realizes high sensitivity and high-quality detection of a very low frequency signal. And the use of the core-shifting optical fiber is avoided, and the structure is simpler.
The technical scheme adopted by the invention is as follows:
the invention consists of a metal base, two active optical fibers with DFB gratings, a pumping source, two wavelength division multiplexers, a 3dB coupler, two metal clamping blocks, two photoelectric detectors and a signal acquisition and processing end.
Each wavelength division multiplexer is provided with three ports, namely an a port, a b port and a c port, wherein the a port is a pumping input end, the input bandwidth of the a port covers the output light wavelength range of a pumping source, the b port is used for pumping light output and signal light input, the c port is a signal light output end, and the output bandwidth of the c port covers the signal light wavelength range returned by the active optical fiber with the DFB grating;
the metal base is a cube, the front surface of the metal base is provided with a large hole, the back surface of the metal base is provided with a small hole, the centers of the large hole and the small hole are coaxial, and the bottom of the metal base is provided with four fixing holes;
the metal clamping blocks are semi-cylinders, the diameters of the metal clamping blocks are matched with the large holes, grooves are formed in the two metal clamping blocks, and the diameters of the grooves are matched with the diameter of the active optical fiber with the DFB grating;
the two active optical fibers engraved with the DFB grating are fixed together in parallel, preferably parallel adhesion, and can also be fixed by other modes such as sleeve packaging and the like. One end of the two active optical fibers with the DFB grating is clamped by two metal clamping blocks through a groove, and only the part with the grating is exposed to form a cantilever beam as a strain sensing part. Two metal clamping blocks are inserted into the large holes. The tail fibers of the two paths of active optical fibers with the DFB grating are led out through the small holes on the back of the metal base and are respectively connected with the ports of the two wavelength division multiplexers. The ports c of the two wavelength division multiplexers are respectively connected with the photoelectric detector, the ports a of the two wavelength division multiplexers are connected with the two output ends of the 3dB coupler, and the input end of the 3dB coupler is connected with the output end of the pumping source. The output ends of the two photoelectric detectors are connected with the signal acquisition and processing end.
The two paths of active optical fibers with the DFB grating are identical in grating pitch, grating region length and the type and concentration of doped ions, the central frequency of the two paths of active optical fibers is determined according to detection requirements, the preferred diameter of the two paths of active optical fibers is 125um, and the central wavelength of output light is 1550 nm; the central wavelength of pump output light in the pump source is determined according to the requirement of the optical wavelength of the detection signal, and if the optical wavelength of the signal is 1550nm, the corresponding optical wavelength of the pump can be 980 nm;
the method for realizing low-frequency detection by adopting the invention comprises the following steps: the pumping light is output from a pumping source, enters a 3dB coupler and then is divided into two paths with equal light intensity, the two paths of the pumping light enter active optical fibers engraved with DFB gratings through ports a and b of a wavelength division multiplexer, reverse signal light is respectively generated in the active optical fibers under the excitation of the pumping light and the frequency selection action of the gratings, then the signal light returns from the two paths of the active optical fibers and is output through a port c of the two wavelength division multiplexers and enters a photoelectric detector, and the condition of external low-frequency vibration is judged through the frequency change trend and the size of the signal light detected by a signal acquisition and processing end, and the specific judgment method comprises the following steps:
when the metal base is fixed and does not vibrate, the output light frequency of the two signal lights is the same.
When the outside generates vibration, the cantilever beam formed by the two DFB gratings vibrates and generates strain when the cantilever beam is vibrated by the outside, and further the output light frequency of the signal light changes. From the change in strain to the output light frequency, the rationale is expressed as the following equation:
wherein, Deltaupsilon represents frequency variation, the positive and negative of the frequency variation are the same as those of strain, the upsilon represents original light frequency, the kappa represents the coupling coefficient of the grating, and the Deltaepsilon (x, t) represents t at xStrain of etching, x1And x2Respectively the grating start point and the end point.
When the vibration direction is in the center connecting line direction of the two DFBs, the positive and negative of the strain is opposite because the two DFBs are respectively arranged at the two sides of the neutral plane, so that the grating pitch of the grating engraved on the two DFBs is increased, the other grating pitch is decreased, the output light frequency of the laser with the increased grating pitch is decreased, the output light frequency of the laser with the decreased grating pitch is increased, the strain is measured through the difference value of the two output light frequencies, and the detection sensitivity of the cantilever beam vibration sensor is maximum at the moment; when the vibration direction is in the direction perpendicular to the central connection line of the two DFBs, because the two DFBs are on the central plane, the strain of the two DFBs is the same, the grid pitch variation trend is also the same, the output light frequency variation trend is the same, the difference result approaches to 0, the difference result is the same as that when no vibration exists outside, and the detection sensitivity of the cantilever beam vibration sensor is the lowest at the moment; when the vibration direction is at a certain included angle (0-90 degrees) with the central connecting line of the two DFBs, the vibration can be decomposed to the direction perpendicular to and parallel to the central connecting line of the two DFBs, the perpendicular direction is analyzed in the same way, frequency difference is not caused, the frequency difference is caused in the parallel direction, but the strain in the direction is the component of the total strain and is necessarily smaller than the total strain, so the detection sensitivity is lower than the condition that the vibration direction is on the central connecting line of the two DFBs. It is thereby obtained that the sensor has excellent directivity.
The beneficial technical effects of the invention are as follows:
1. the invention uses two paths of same DFBs fixed in parallel, thus greatly improving the directionality of the cylindrical cantilever beam vibration velocity hydrophone.
2. Because two DFBs are fixed in parallel, compared with the core-offset optical fiber, the structure of the fiber-core-offset optical fiber is simpler, the distance between the fiber core and a neutral surface is increased, the sensitivity of strain detection is improved, and the sensitivity enhancement effect is good.
3. According to the invention, the frequency of the output light of the two DFBs is used for making a difference, and for the frequency change caused by the same strain, the difference result is twice of the frequency change value of each DFB, and compared with the sensor with a single DFB structure, the sensitivity is improved to two times.
4. The three-dimensional vibration sensor has good structural symmetry, improves the directivity of cantilever beam detection, and can realize three-dimensional vibration sensing only by adding two identical cantilever beams and three cantilever beams which are vertical to each other on the metal base in an extending way to form three axes.
In a word, the detection directivity of the cylindrical cantilever beam is greatly improved by the adhesive use of the two DFB lasers, and a foundation is provided for the subsequent formation of three-dimensional detection. Meanwhile, due to the structure similar to push-pull and the differential demodulation mode, the sensitivity is doubled. And compared with the core-offset optical fiber, the two DFB adhesion paths are further improved in the distance between the fiber core and the neutral surface and the sensitivity.
Drawings
FIG. 1 is a block diagram of the overall architecture of the present invention;
FIG. 2 is a three-dimensional view of an assembly of the sensing portion of the present invention;
FIG. 3 is a three-dimensional view of a metal base;
FIG. 4 is a three-dimensional view of a metal clamping block;
wherein: the optical fiber coupler comprises a metal base 1, a metal base 2, a metal base front large hole 3, a metal base back small hole 4, a metal base back small hole 5, two active optical fibers with DFB gratings, a pumping source 6, two wavelength division multiplexers 7, 8, three ports a, b, c, a 3dB coupler 9, two metal clamping blocks 10, 11, grooves 12, 13, fixing holes 14a, 14b, 14c, 14d, photoelectric detectors 15, 16 and a signal acquisition and processing end 17.
Detailed Description
The present invention is further described in conjunction with the above-mentioned figures, the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.
Fig. 1 is a schematic structural view of the present invention. The invention comprises a metal base 1, two active optical fibers 4 and 5 engraved with DFB gratings, a pumping source 6, two wavelength division multiplexers 7 and 8, a 3dB coupler 9, two metal clamping blocks 10 and 11, two photoelectric detectors 15 and 16 and a signal acquisition and processing end 17.
Each wavelength division multiplexer is provided with three ports, namely a port a, a port b and a port c, wherein the port a is a pumping input end, the input bandwidth of the port a covers 980nm, the port b is used for pumping light output and signal light input, the port c is a signal light output end, the bandwidth of the signal output light covers 1550nm, the central wavelength of the output light of the pumping source 6 is 980nm, and the central wavelength of the signal light is 1550 nm;
the metal base 1 is a combined cube formed by two cubes, the front side of the metal base is provided with a large hole 2, the back side of the metal base is provided with a small hole 3, the centers of the large hole and the small hole are coaxial, and the bottom of the metal base 1 is provided with four fixing holes 14a, 14b, 14c and 14 d; the parameters of the metal base are that the base is 70mm multiplied by 8mm, and the cube on the base is 40mm multiplied by 70mm multiplied by 40 mm; the diameter of the big hole 2 is 20mm, and the depth is 50 mm; the diameter of the small hole 3 is 5mm, and the depth is 20 mm.
The metal clamping blocks 10 and 11 are semi-cylinders, the diameter of the metal clamping blocks is matched with the diameter of the large hole 2, grooves 12 and 13 are formed in the two metal clamping blocks 10 and 11, and the diameters of the grooves 12 and 13 are matched with the diameter of the active optical fiber with the DFB. The structural parameters are as follows, the diameters of the clamping blocks 10 and 11 are 20mm, the height is 70mm, and the diameters of the grooves 12 and 13 are 125 um. (ii) a
The grating distance of the two active optical fibers 4 and 5 carved with the DFB grating is 51nm, the length of the grating area is 50mm, the type of doped ions is bait ions, the concentration of the doped ions can be 300ppm, the diameter is 125um, and the central wavelength of output light is 1550 nm;
two active optical fibers 4 and 5 carved with DFB gratings are adhered together in parallel, one end of the two active optical fibers carved with DFB gratings is clamped by two metal clamping blocks 10 and 11 through grooves 12 and 13, and only the part carved with the gratings is exposed to form a cantilever beam as a strain sensing part. Two metal clamping blocks 10, 11 are inserted into the large hole 2. The tail fibers of the two active optical fibers 4 and 5 engraved with the DFB grating are led out through the back small hole 3 on the metal base 1 and are respectively connected with the ports b of the two wavelength division multiplexers 7 and 8. The ports c of the two wavelength division multiplexers 7 and 8 are respectively connected with the photoelectric detectors 15 and 16, the ports a of the two wavelength division multiplexers 7 and 8 are connected with the two output ends of the 3dB coupler 9, and the input end of the 3dB coupler 9 is connected with the output end of the pumping source 1. The output ends of the two photodetectors 15, 16 are connected to a signal acquisition and processing end 17.
When external vibration is transmitted to the device, the cantilever beam formed by the 4 and 5 generates strain, if the vibration direction is in the direction of the central connecting line of the 4 and 5, the strain generated by the two DFBs is the same in magnitude theoretically, but one DFB is compressed and the other DFB is stretched, so that the output light frequency of the two DFBs is increased and decreased. The output light is led out through the tail fiber to carry out demodulation and difference of optical frequency, so that strain information of the cantilever beam can be obtained, and further vibration information can be obtained.
The above description is only for the preferred embodiment of the present invention and is not intended to limit the scope of the present invention, and all equivalent structural changes made by using the contents of the present specification and the drawings, or any other related technical fields, are included in the scope of the present invention. The invention is intended to cover modifications within the spirit and scope of the appended claims.
Claims (7)
1. A cylindrical cantilever beam vibration sensor based on a double-channel DFB fiber laser is characterized by comprising a metal base (1), two active fibers (4) and (5) with DFB gratings, a pumping source (6), two wavelength division multiplexers (7) and (8), a 3dB coupler (9), two metal clamping blocks (10) and (11), two photoelectric detectors (15) and (16) and a signal acquisition and processing end (17);
each wavelength division multiplexer (7) and (8) is provided with three ports a, b and c, wherein the port a is a pumping input end, the input bandwidth of the port a covers the output light wavelength range of the pumping source (6), the port b is used for pumping light output and signal light input, the port c is a signal light output end, and the output bandwidth of the port c covers the signal light wavelength range returned by the active optical fibers (4) and (5) engraved with DFB gratings;
the metal base (1) is a cube, the front surface of the metal base is provided with a large hole (2), the back surface of the metal base is provided with a small hole (3), the centers of the large hole and the small hole are coaxial, and the bottom of the metal base (1) is provided with four fixing holes (14a), (14b), (14c) and (14 d);
the metal clamping blocks (10) and (11) are semi-cylinders, the diameters of the metal clamping blocks are matched with the large holes (2), grooves (12) and (13) are formed in the two metal clamping blocks (10) and (11), and the diameters of the grooves (12) and (13) are matched with the diameters of active optical fibers (4) and (5) carved with DFB gratings;
the grating pitch, the length, the doping ion species and the concentration of two active optical fibers (4) and (5) carved with DFB gratings are the same, the central frequency is determined according to the detection requirement, and the central wavelength of the light output by the pumping source (6) is determined according to the optical wavelength requirement of the detection signal;
two active optical fibers (4) and (5) carved with DFB gratings are fixed together in parallel, one end of the two active optical fibers (4) and (5) carved with DFB gratings is clamped by two metal clamping blocks (10) and (11) through grooves (12) and (13), only the part carved with the gratings is exposed, the two metal clamping blocks (10) and (11) are inserted into the large hole (2), the tail fibers of the two active optical fibers (4) and (5) carved with the DFB grating are led out through the small holes (3) on the back of the metal base (1), and are respectively connected with the b ports of the two wavelength division multiplexers (7) and (8), the c ports of the two wavelength division multiplexers (7) and (8) are respectively connected with the two photoelectric detectors (15) and (16), the a ports of the two wavelength division multiplexers (7) and (8) are respectively connected with the two output ends of the 3dB coupler (9), and the input end of the 3dB coupler (9) is connected with the output end of the pumping source (6). The output ends of the two photoelectric detectors (15) and (16) are connected with a signal acquisition and processing end (17).
2. The cylindrical cantilever beam vibration sensor based on the two-way DFB fiber laser as in claim 1, wherein the two DFB grating-engraved active fibers (4) and (5) are adhered in parallel.
3. The cylindrical cantilever beam vibration sensor based on the two-way DFB fiber laser as claimed in claim 1, wherein the two DFB grating-engraved active optical fibers (4) and (5) are packaged in parallel by a sleeve.
4. The cylindrical cantilever beam vibration sensor based on two-way DFB fiber laser as claimed in claim 1, wherein the diameter of the DFB grating-engraved active fibers (4) and (5) is 125 um.
5. The cylindrical cantilever beam vibration sensor based on the two-way DFB fiber laser as claimed in claim 1, wherein the center wavelength of the output light of the DFB grating-engraved active optical fibers (4) and (5) is 1550 nm.
6. The cylindrical cantilever beam vibration sensor based on the two-way DFB fiber laser as in claim 5, wherein the pump source (6) outputs light with a center wavelength of 980 nm.
7. The cylindrical cantilever beam vibration sensor based on the two-way DFB fiber laser as claimed in claim 1, wherein the DFB grating engraved active fibers (4) and (5) are doped with erbium ions with a doping concentration of 300 ppm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911040539.9A CN110608797A (en) | 2019-10-29 | 2019-10-29 | Cylindrical cantilever beam vibration sensor based on double-path DFB fiber laser |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911040539.9A CN110608797A (en) | 2019-10-29 | 2019-10-29 | Cylindrical cantilever beam vibration sensor based on double-path DFB fiber laser |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110608797A true CN110608797A (en) | 2019-12-24 |
Family
ID=68895580
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911040539.9A Pending CN110608797A (en) | 2019-10-29 | 2019-10-29 | Cylindrical cantilever beam vibration sensor based on double-path DFB fiber laser |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110608797A (en) |
Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1605835A (en) * | 2004-11-26 | 2005-04-13 | 清华大学 | Optical fiber grating multi-parameter comprehensive sensing experimental apparatus |
| CN101368978A (en) * | 2008-10-07 | 2009-02-18 | 哈尔滨工程大学 | Double-core optical fiber integration type accelerometer and measuring method |
| CN101398440A (en) * | 2008-10-22 | 2009-04-01 | 中国科学院半导体研究所 | Optical fiber laser acceleration sensor |
| CN101852815A (en) * | 2010-05-13 | 2010-10-06 | 北京交通大学 | Temperature self-compensating cantilever beam type fiber grating accelerometer |
| CN101852643A (en) * | 2010-05-25 | 2010-10-06 | 中国人民解放军国防科学技术大学 | Temperature self-compensating double grating symmetrical push-pull type fiber grating vibrating sensor |
| CN101893455A (en) * | 2010-07-09 | 2010-11-24 | 哈尔滨工程大学 | Optical fiber composite chamber laser feedback effect sensor and special demodulating method thereof |
| CN102374895A (en) * | 2011-09-26 | 2012-03-14 | 中国人民解放军国防科技大学 | Large dynamic optical fiber vibration sensor |
| CN103644991A (en) * | 2013-12-27 | 2014-03-19 | 哈尔滨理工大学 | Dual-FBG (fiber bragg grating) stress sensor based on DFB (Distributed Feed Back) laser demodulation and stress measuring method |
| WO2016029814A1 (en) * | 2014-08-25 | 2016-03-03 | 同方威视技术股份有限公司 | Fibre bragg grating vibration sensor and vibration measurement element thereof |
| CN105571619A (en) * | 2015-12-17 | 2016-05-11 | 安徽中科智泰光电测控科技有限公司 | FBG sensor sensitivity improving method based on cantilever structure |
| CN106680535A (en) * | 2016-12-30 | 2017-05-17 | 北京航空航天大学 | Differential motion type optical acceleration meter for achieving laser beat frequency based on fiber bragg optical grating reflection spectrum features |
| CN106872015A (en) * | 2017-02-22 | 2017-06-20 | 重庆邮电大学 | A kind of optical-fiber type vibrating sensing measuring system |
| CN210741667U (en) * | 2019-10-29 | 2020-06-12 | 中国人民解放军国防科技大学 | Cylindrical cantilever beam vibration sensor based on double-path DFB fiber laser |
-
2019
- 2019-10-29 CN CN201911040539.9A patent/CN110608797A/en active Pending
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1605835A (en) * | 2004-11-26 | 2005-04-13 | 清华大学 | Optical fiber grating multi-parameter comprehensive sensing experimental apparatus |
| CN101368978A (en) * | 2008-10-07 | 2009-02-18 | 哈尔滨工程大学 | Double-core optical fiber integration type accelerometer and measuring method |
| CN101398440A (en) * | 2008-10-22 | 2009-04-01 | 中国科学院半导体研究所 | Optical fiber laser acceleration sensor |
| CN101852815A (en) * | 2010-05-13 | 2010-10-06 | 北京交通大学 | Temperature self-compensating cantilever beam type fiber grating accelerometer |
| CN101852643A (en) * | 2010-05-25 | 2010-10-06 | 中国人民解放军国防科学技术大学 | Temperature self-compensating double grating symmetrical push-pull type fiber grating vibrating sensor |
| CN101893455A (en) * | 2010-07-09 | 2010-11-24 | 哈尔滨工程大学 | Optical fiber composite chamber laser feedback effect sensor and special demodulating method thereof |
| CN102374895A (en) * | 2011-09-26 | 2012-03-14 | 中国人民解放军国防科技大学 | Large dynamic optical fiber vibration sensor |
| CN103644991A (en) * | 2013-12-27 | 2014-03-19 | 哈尔滨理工大学 | Dual-FBG (fiber bragg grating) stress sensor based on DFB (Distributed Feed Back) laser demodulation and stress measuring method |
| WO2016029814A1 (en) * | 2014-08-25 | 2016-03-03 | 同方威视技术股份有限公司 | Fibre bragg grating vibration sensor and vibration measurement element thereof |
| CN105571619A (en) * | 2015-12-17 | 2016-05-11 | 安徽中科智泰光电测控科技有限公司 | FBG sensor sensitivity improving method based on cantilever structure |
| CN106680535A (en) * | 2016-12-30 | 2017-05-17 | 北京航空航天大学 | Differential motion type optical acceleration meter for achieving laser beat frequency based on fiber bragg optical grating reflection spectrum features |
| CN106872015A (en) * | 2017-02-22 | 2017-06-20 | 重庆邮电大学 | A kind of optical-fiber type vibrating sensing measuring system |
| CN210741667U (en) * | 2019-10-29 | 2020-06-12 | 中国人民解放军国防科技大学 | Cylindrical cantilever beam vibration sensor based on double-path DFB fiber laser |
Non-Patent Citations (3)
| Title |
|---|
| 于洋等: "对称推挽式光纤光栅振动传感器设计研究", 半导体光电, no. 01, 15 February 2011 (2011-02-15), pages 121 - 125 * |
| 成振龙等: "一种基于光纤光栅法布里-珀罗腔的低频振动传感器", 光子学报, no. 01, 15 January 2010 (2010-01-15), pages 53 - 58 * |
| 罗裴等: "双光纤光栅高频加速度传感器的研究", 光电工程, no. 06, 15 June 2012 (2012-06-15), pages 57 - 60 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101726354B (en) | Optical fiber laser vector hydrophone | |
| EP3004829B1 (en) | All-optical pressure sensor | |
| CN108731789B (en) | Underwater sound detection device based on photoelectric oscillator | |
| US7697797B2 (en) | Aligned embossed diaphragm based fiber optic sensor | |
| CN103134581B (en) | Push-pull type fiber laser vector hydrophone | |
| CN111103051A (en) | Optical fiber interference type hydrophone detection system and method | |
| CN105092016B (en) | A kind of MOEMS vector hydrophones | |
| CN112924013B (en) | Acceleration-resistant optical fiber hydrophone probe device | |
| CN107911782B (en) | Optical fiber microphone probe and optical fiber microphone system | |
| CN111399034A (en) | Enhanced hydrophone detection device and method based on low-bending-loss chirped grating array optical fiber | |
| CN110261892B (en) | Single-component and three-component fiber grating vibration sensor and sensing array | |
| CN111829645B (en) | Acoustic/vibration monitoring system based on optical fiber sensor | |
| CN112113653B (en) | Folded beam type optical fiber laser hydrophone | |
| CN111256807B (en) | Small-size interference type high-frequency optical fiber hydrophone based on folding air cavity | |
| CN210741667U (en) | Cylindrical cantilever beam vibration sensor based on double-path DFB fiber laser | |
| CN104697624B (en) | A kind of acoustic detector based on Michelson's interferometer | |
| CN110608797A (en) | Cylindrical cantilever beam vibration sensor based on double-path DFB fiber laser | |
| CN116359844A (en) | Optical fiber Fabry-Perot sound positioning sensor of hub coupling type vibrating diaphragm | |
| CN110849464A (en) | Optical fiber Fabry-Perot sound sensor based on hub-shaped vibrating diaphragm | |
| CN109060105A (en) | A kind of fermat spiral optical fiber ring structured novel hydrophone probe | |
| CN109655149B (en) | Optical fiber laser vector hydrophone | |
| CN210802682U (en) | Optical fiber interference type hydrophone detection system | |
| CN208458873U (en) | A kind of fermat spiral optical fiber ring structured novel hydrophone probe | |
| CN215677267U (en) | Optical fiber sensor | |
| CN111024211A (en) | High-sensitivity differential optical fiber F-P micro-vibration sensor and demodulation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |