CN111220262A - Wavelength-adjustable acceleration sensor based on fiber laser - Google Patents
Wavelength-adjustable acceleration sensor based on fiber laser Download PDFInfo
- Publication number
- CN111220262A CN111220262A CN202010242915.9A CN202010242915A CN111220262A CN 111220262 A CN111220262 A CN 111220262A CN 202010242915 A CN202010242915 A CN 202010242915A CN 111220262 A CN111220262 A CN 111220262A
- Authority
- CN
- China
- Prior art keywords
- temperature compensation
- acceleration sensor
- fiber laser
- laser
- shell
- 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
Images
Classifications
-
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P15/00—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration
- G01P15/02—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses
- G01P15/03—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses by using non-electrical means
Abstract
The invention relates to an acceleration sensor, and particularly discloses a wavelength-adjustable acceleration sensor based on a fiber laser. This acceleration sensor with adjustable wavelength, including installing the body structure of bottom in the shell, its characterized in that: the body structure comprises a base connected with the bottom of the shell, hinges are symmetrically arranged on two sides of the base, symmetrical mass blocks are connected to the two hinges, transverse grooves are formed in the mass blocks, set screws penetrating through the transverse grooves are installed on the mass blocks, and vertical extension rods are arranged at the top ends of the mass blocks; the top end of the extension rod is provided with a temperature compensation body, the two sides of the shell are symmetrically provided with supporting tubes extending into the shell, the fiber laser penetrates through the temperature compensation body, and tail fibers at the two ends of the fiber laser penetrate out of the supporting tubes. The invention has reasonable structural design, high sensitivity and wide frequency band, effectively improves the frequency response characteristic of the sensor, realizes the functions of ground cross sensitivity, adjustable wavelength and temperature compensation, and is suitable for wide popularization and application.
Description
(I) technical field
The invention relates to an acceleration sensor, in particular to a wavelength-adjustable acceleration sensor based on a fiber laser.
(II) background of the invention
The optical fiber acceleration sensor takes an optical fiber as a sensing and signal transmission medium, and utilizes the modulation of signals such as measured vibration and the like on the optical fiber to restore the acceleration measurement of the vibration. Compared with the traditional electronic sensor, the sensor has the advantages of high sensitivity, electromagnetic interference resistance, water resistance, long signal transmission, high reliability and the like. Especially, the optical fiber acceleration sensor based on the optical fiber laser also has the advantages of high resolution, easy multiplexing into an array, simple structure, small volume and the like, and has important application in the fields of equipment vibration monitoring, seismic detection, military security and the like.
The existing acceleration sensor based on the optical fiber laser mainly detects the acceleration signal of microseism through an inertia sensitive structure formed by a mass block elastic structure. The invention discloses an optical fiber laser acceleration sensor for a submarine, a manufacturing method and a working method thereof, and the like, wherein a mass block and a capillary structure are adopted, so that the working frequency band of the optical fiber laser acceleration sensor is widened, the frequency response characteristic of the optical fiber laser acceleration sensor is improved, the consistency of the packaging process of the optical fiber laser acceleration sensor is improved, and the cross sensitivity is not effectively limited; zhang waves, et al invented a fiber laser detector for land and underwater use, which adopts a cylindrical structure of mass block and double diaphragms, although the volume is small and exquisite, the sensitivity is low. In addition, the above solutions all have the problems of low sensitivity, difficult control of the wavelength of the fiber laser during packaging and manufacturing, additional tension to the fiber laser caused by thermal expansion of the housing, limited temperature range, and the like.
Disclosure of the invention
The invention provides the wavelength adjustable acceleration sensor based on the fiber laser, which has high sensitivity, wide frequency band and low cross sensitivity, and is used for making up the defects of the prior art.
The invention is realized by the following technical scheme:
the utility model provides an acceleration sensor with adjustable wavelength based on fiber laser, is including installing the body structure of bottom in the shell, its characterized in that: the body structure comprises a base connected with the bottom of the shell, hinges are symmetrically arranged on two sides of the base, symmetrical mass blocks are connected to the two hinges, transverse grooves are formed in the mass blocks, set screws penetrating through the transverse grooves are installed on the mass blocks, and vertical extension rods are arranged at the top ends of the mass blocks; the top end of the extension rod is provided with a temperature compensation body, the two sides of the shell are symmetrically provided with supporting tubes extending into the shell, the fiber laser penetrates through the temperature compensation body, and tail fibers at the two ends of the fiber laser penetrate out of the supporting tubes.
In the invention, the shell is used for protecting an internal structure, the base is connected with the shell, the hinges at two sides of the base can generate torsional deformation around the center, two symmetrical mass blocks drive the hinges to generate deformation under the action of acceleration, and the extension rod can generate offset relative to the mass blocks by adjusting the set screws; the temperature compensation body is used for compensating deformation generated by thermal expansion of the body structure, the optical fiber laser is used for measuring acceleration through wavelength change, and the supporting tube is used for protecting a tail fiber of the optical fiber laser and reducing the self-vibration effect of the tail fiber.
The more preferable technical scheme of the invention is as follows:
the temperature compensation body and the supporting tube are arranged on the same horizontal line, so that the horizontal installation of the optical fiber laser is realized.
The shell and the body are made of low-expansion-coefficient alloy materials, preferably invar alloy materials; the temperature compensation body is made of alloy material with high expansion coefficient relative to the body structure, and preferably stainless steel material.
The temperature compensation body and the extension rod are in contact with each other on the outer side surface relative to the body structure and form a coupling surface, and the coupling mode of the temperature compensation body and the extension rod is welding or threaded connection; the coupling point of the fiber laser and the temperature compensation body is at the inner side position of the temperature compensation body relative to the body structure, and the coupling mode of the fiber laser and the temperature compensation body is epoxy glue bonding or welding.
The temperature compensation body is provided with a central through hole, and the optical fiber laser penetrates through the central through hole
The optical fiber laser has a pretightening force which is 0.1-0.5N; the pretightening force of the fiber laser can be adjusted by adjusting the set screw, so that the central wavelength of the fiber laser can be adjusted.
The body structure is formed by alloy material warp cutting or laser cutting, and the consistency of the body structure is effectively improved.
The optical fiber laser is provided with a capillary quartz tube sheath to limit the influence of the external environment on the laser, limit the influence of transverse vibration and reduce the transverse sensitivity.
The sensitivity of the sensor is improved through the hinge lever amplification structure; the working frequency band of the sensor is widened and the frequency response characteristic of the sensor is improved through the structure that the mass block is combined with the hinge and the tail fiber supporting structure; the cross sensitivity is reduced by the combination of structural symmetry and a capillary structure; the wavelength is adjusted by adjusting the prestress of the fiber laser by adding an adjusting structure on the mass block; by matching the temperature compensation structure, the additional tension of the fiber laser caused by the thermal expansion of the structure is eliminated, and the working temperature range is expanded.
The invention has reasonable structural design, high sensitivity and wide frequency band, effectively improves the frequency response characteristic of the sensor, realizes the functions of ground cross sensitivity, adjustable wavelength and temperature compensation, and is suitable for wide popularization and application.
(IV) description of the drawings
The invention will be further described with reference to the accompanying drawings.
FIG. 1 is a schematic structural view of the present invention;
fig. 2 is a partial structural schematic diagram of the present invention.
In the figure, a shell 01, a body 02 structure, a base 201, a hinge 202, a mass 203, a transverse groove 204, a set screw 205, an extension rod 206, a temperature compensation body 03, a coupling point 301, a coupling surface 302, a central through hole 303, a fiber laser 04 and a support tube 05 are arranged.
(V) detailed description of the preferred embodiments
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to specific embodiments and the accompanying drawings.
Referring to fig. 1, an overall structure diagram of a wavelength-tunable acceleration sensor based on a fiber laser provided by the present invention includes: the fiber laser comprises a shell 01, a body structure 02, a base 201, a hinge 202, a mass block 203, a transverse groove 204, a set screw 205, an extension rod 206, a temperature compensation body 03, a fiber laser 04 and a support tube 05.
Referring to fig. 2, a partial structure diagram of a wavelength tunable acceleration sensor based on a fiber laser according to the present invention includes: extension rod 206, temperature compensation body 03, coupling point 301 of temperature compensation body 03 and fiber laser 04, coupling surface 302 of temperature compensation body 03 and extension rod 206, and central through hole 303 of temperature compensation body 03.
As shown in fig. 1, in the wavelength tunable acceleration sensor based on the fiber laser, a housing 01 is a square groove-shaped metal structure and is provided with a metal cover for protecting an internal structure.
The body structure 02 mounted at the bottom of the interior of the housing is preferably machined from an Invar alloy having a very low coefficient of thermal expansion, typically by wire cutting or laser cutting of alloy sheet material to ensure process consistency; comprises a base 201, which is connected with a shell 01 and is arranged at the bottom of the inner side of the shell 01 in a welding or threaded manner; the hinges 202 which are symmetrical on two sides of the base 201 are formed by wire cutting or laser cutting processing and can generate torsional deformation around the center; the symmetrical mass 203 connected with the hinge 202 drives the hinge 202 to deform under the action of acceleration.
The mass block 203 is provided with a transverse slot 204, which is generally obtained by wire cutting or laser cutting, and is divided into an upper part and a lower part which are connected, wherein the edge of the upper part is provided with a threaded hole, and a set screw 205 is arranged to penetrate through the transverse slot 204 and contact with the lower part of the mass block; the mass has an extension rod 206, and adjustment of the set screw 205 causes the extension rod 206 to deflect relative to the mass 204.
The extension rod is provided with a through hole or a threaded hole, passes through the through hole and is installed on the temperature compensation body 03 at the top end of the extension rod, and is used for compensating deformation generated by thermal expansion of the body structure 02; the temperature compensation body 03 is provided with a central through hole, the temperature compensation body 03 and the extension rod 206 are in contact with and coupled with the outer side surface of the body structure 02 relatively, and preferably, the coupling mode is welding or threaded connection; the temperature compensation body 03 is made of an alloy material with a higher expansion coefficient than the body structure 02, such as stainless steel.
The optical fiber laser 04 penetrates through a central through hole of the temperature compensation body 03, and a coupling point of the optical fiber laser 04 and the compensation body 03 is arranged at the inner side position of the temperature compensation body relative to the body structure 02, preferably, the coupling mode is epoxy glue bonding or welding; the fiber laser 04 is used to measure acceleration by wavelength change.
And the supporting tubes 05 are arranged on two sides of the shell, the middle of the supporting tubes is provided with the fiber laser 04 tail fiber penetrating out, the tail fiber is protected, and the self-vibration effect of the tail fiber is reduced.
After the fiber laser 04 is installed, the wavelength can be adjusted as follows: the pre-tightening force of the fiber laser 04 can be adjusted by adjusting the set screw 205, so that the central wavelength of the fiber laser 04 can be adjusted; tightening the set screw 205 can cause the extension rod 206 to shift inward relative to the mass block 204, thereby reducing the pre-tightening force of the fiber laser 04 and reducing the wavelength; conversely, loosening the set screw 205 can cause the extension rod 206 to shift outward relative to the mass 204, thereby increasing the pre-tension of the fiber laser 04 and increasing the wavelength; the fiber laser 04 has a certain pre-tightening force, preferably, the pre-tightening force is 0.1N to 0.5N.
The working principle of the wavelength-adjustable acceleration sensor based on the optical fiber laser 04 provided by the invention is as follows: the shell 01 is coupled with a measured object, the coupling mode is threaded connection, high-strength glue bonding, fixation through a clamp and the like, and the coupling effect is rigid coupling. When a vibration signal in the vertical direction exists, the mass block 203 vibrates relative to the body structure 02 under the action of inertia force, the relative displacement of the vibration is converted into the stretching of the fiber laser 04 through the hinge 202 and the extension rod 206, the stretching directions of the two symmetrical ends are opposite, the axial strain of the fiber laser 04 is amplified to cause the change of the laser wavelength, and the change of the wavelength is detected through the wavelength demodulation equipment of the fiber laser 04, so that a microseismic signal can be obtained; here, the inertia force is proportional to the vibration acceleration amplitude, and therefore, the wavelength change of the fiber laser 04 is proportional to the vibration acceleration amplitude.
If the vibration direction is transverse, the mass center of the mass block 203, the rotation center of the hinge 202 and the vibration direction are on the same axis, the hinge 202 is not easy to twist, and the extension rod 206 is symmetrically caused to have the same stretching direction of the fiber laser 04 and cancel each other out, so that the axial strain of the fiber laser 04 is small and the fiber laser 04 is not sensitive to transverse vibration; if the vibration direction is perpendicular to the direction shown in fig. 1, the hinge 202 is not easily twisted, and the extension rod 206 symmetrically extends in the same direction as the fiber laser, so that the two directions cancel each other out, and the axial strain of the fiber laser 04 is small and is not sensitive to vibration.
Referring to fig. 1 and 2, the wavelength tunable acceleration sensor based on the fiber laser provided by the invention eliminates the additional tension on the fiber laser caused by the thermal expansion of the structure in the following manner, and expands the working temperature range: the extension rod 206 is provided with a through hole, the temperature compensation body 03 passes through the through hole and is arranged at the top end of the extension rod 206, and the temperature compensation body 03 and the extension rod 206 are contacted and coupled relative to the outer side surface of the body structure 02, preferably, the coupling mode is welding or threaded connection; the temperature compensation body 03 is provided with a central through hole, the optical fiber laser 04 penetrates through the central through hole 303, and the coupling point 301 of the optical fiber laser 04 and the compensation body 03 is arranged at the inner side position of the temperature compensation body 03 relative to the body structure 02, preferably, the coupling mode is epoxy glue bonding or welding; the temperature compensation body 03 is made of an alloy material with a higher expansion coefficient than the body structure 02, preferably, the body structure 02 is made of Invar alloy with a low expansion coefficient, and the temperature compensation body 03 is made of stainless steel material with a higher expansion coefficient. In this way, the optical fiber laser 04 is made of quartz material, the expansion coefficient is lower than that of the body structure 02, the expansion coefficient of the temperature compensation body 03 is higher than that of the body structure 02, and therefore, a proper length proportion is inevitably existed, so that the sum of the thermal expansion of the temperature compensation body 03 and the thermal expansion of the optical fiber laser 04 is equal to that of the body structure 02, thereby achieving expansion matching and eliminating the additional tension of the optical fiber laser 04 caused by the structural thermal expansion.
Further, the optical fiber laser 04 has a capillary quartz tube sheath to limit the influence of the external environment on the laser, and to limit the influence of lateral vibration, reducing lateral sensitivity.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. The utility model provides an acceleration sensor with adjustable wavelength based on fiber laser, is including installing body structure (02) of bottom in shell (01), its characterized in that: the body structure (02) comprises a base (201) connected with the bottom of the shell (01), hinges (202) are symmetrically arranged on two sides of the base (201), symmetrical mass blocks (203) are connected to the two hinges (202), transverse grooves (204) are formed in the mass blocks (203), set screws (205) penetrating through the transverse grooves (204) are installed on the mass blocks (203), and vertical extension rods (206) are arranged at the top ends of the mass blocks (203); a temperature compensation body (03) is installed at the top end of the extension rod (206), supporting pipes (05) extending into the shell (01) are symmetrically installed on two sides of the shell, the optical fiber laser (04) penetrates through the temperature compensation body (03) and tail fibers at two ends of the optical fiber laser penetrate through the supporting pipes (05).
2. The fiber-laser based wavelength tunable acceleration sensor according to claim 1, characterized in that: the temperature compensation body (03) and the support tube (05) are arranged on the same horizontal level.
3. The fiber-laser based wavelength tunable acceleration sensor according to claim 1, characterized in that: the shell (01) and the body structure (02) are made of alloy materials with low expansion coefficients, and the temperature compensation body (03) is made of alloy materials with high expansion coefficients relative to the body structure.
4. The fiber-laser based wavelength tunable acceleration sensor according to claim 1, characterized in that: the temperature compensation body (03) and the extension rod (206) are in contact with each other on the outer side surface relative to the body structure (02) to form a coupling surface (302), and the coupling point (301) of the optical fiber laser (04) and the temperature compensation body (03) is at the inner side position of the temperature compensation body (03) relative to the body structure (02).
5. The fiber-laser based wavelength tunable acceleration sensor according to claim 1, characterized in that: the temperature compensation body (03) is provided with a central through hole (303), and the optical fiber laser (04) penetrates through the central through hole (303).
6. The fiber-laser based wavelength tunable acceleration sensor according to claim 1, characterized in that: the optical fiber laser (04) has a pretightening force which is 0.1-0.5N.
7. The fiber-laser based wavelength tunable acceleration sensor according to claim 1, characterized in that: the body structure (02) is formed by performing warp cutting or laser cutting on an alloy material.
8. The fiber-laser based wavelength tunable acceleration sensor according to claim 1, characterized in that: and a capillary quartz tube sheath is arranged on the optical fiber laser (04).
9. The fiber-laser based wavelength tunable acceleration sensor according to claim 3, characterized in that: the shell (01) and the body structure (02) are made of invar alloy materials, and the temperature compensation body (03) is made of stainless steel materials.
10. The fiber-laser based wavelength tunable acceleration sensor according to claim 4, characterized in that: the temperature compensation body (03) and the extension rod (206) are coupled in a welding or threaded manner; the coupling mode of the optical fiber laser (04) and the temperature compensation body (03) is epoxy glue bonding or welding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010242915.9A CN111220262A (en) | 2020-03-31 | 2020-03-31 | Wavelength-adjustable acceleration sensor based on fiber laser |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010242915.9A CN111220262A (en) | 2020-03-31 | 2020-03-31 | Wavelength-adjustable acceleration sensor based on fiber laser |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111220262A true CN111220262A (en) | 2020-06-02 |
Family
ID=70826410
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010242915.9A Pending CN111220262A (en) | 2020-03-31 | 2020-03-31 | Wavelength-adjustable acceleration sensor based on fiber laser |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111220262A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114217092A (en) * | 2021-12-15 | 2022-03-22 | 武汉理工大学 | FBG acceleration sensor based on diaphragm and elliptical hinge |
| CN115268010A (en) * | 2022-10-08 | 2022-11-01 | 中国科学院西安光学精密机械研究所 | Reflective laser beam expanding device suitable for high and low temperature environment |
-
2020
- 2020-03-31 CN CN202010242915.9A patent/CN111220262A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114217092A (en) * | 2021-12-15 | 2022-03-22 | 武汉理工大学 | FBG acceleration sensor based on diaphragm and elliptical hinge |
| CN115268010A (en) * | 2022-10-08 | 2022-11-01 | 中国科学院西安光学精密机械研究所 | Reflective laser beam expanding device suitable for high and low temperature environment |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102128952B (en) | Optical fiber grating acceleration sensor and test method thereof | |
| CN111220262A (en) | Wavelength-adjustable acceleration sensor based on fiber laser | |
| GB2450952A (en) | Piezoelectric quartz accelerometer with axial shock absorbing buffer unit | |
| US20030145654A1 (en) | Highly sensitive accelerometer | |
| CN112924013B (en) | Acceleration-resistant optical fiber hydrophone probe device | |
| US20080317401A1 (en) | Optic fiber bragg grating sensor | |
| CN110567572B (en) | Optical fiber laser microseismic detector with combined structure | |
| CN103278845B (en) | Based on the optical fiber grating earthquake acceleration detector of combination cantilever girder construction | |
| US7612886B2 (en) | Fiber-optic seismic sensor | |
| CN110702280A (en) | High-sensitivity fiber grating pressure sensor based on square diaphragm | |
| CN109556702A (en) | Optical fibre grating acceleration sensor based on diaphragm type equi intensity cantilever structure | |
| CN112097968A (en) | Optical fiber pressure and acceleration sensor and installation and calibration method thereof | |
| CN211401409U (en) | Wavelength-adjustable acceleration sensor based on fiber laser | |
| CN111505340A (en) | Fiber grating two-dimensional acceleration sensor with small structure | |
| US5528935A (en) | Stress and velocity gauge | |
| CN201226029Y (en) | Optical fiber and grating seismic detector | |
| US7584665B2 (en) | Combustion transducer apparatus employing pressure restriction means | |
| CN211401408U (en) | Vibrating wire type wide-frequency fiber laser vibration sensor | |
| JPH07174651A (en) | Pressure sensor | |
| CN112697059B (en) | Optical fiber ground deformation sensor for underwater soft medium | |
| CN110146053B (en) | Fiber bragg grating sensor for measuring ship bow movement and application | |
| CN112945438A (en) | Optical fiber type soil pressure sensor | |
| US5048344A (en) | Borehole strain monitor for soft rock | |
| RU2018648C1 (en) | Device for measuring well inclination angle | |
| CN216816727U (en) | Low-frequency FBG acceleration sensor based on cross reed |
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 |