CN103267566A - Piston type fiber bragg grating vibrating sensor - Google Patents
Piston type fiber bragg grating vibrating sensor Download PDFInfo
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- CN103267566A CN103267566A CN2013101587687A CN201310158768A CN103267566A CN 103267566 A CN103267566 A CN 103267566A CN 2013101587687 A CN2013101587687 A CN 2013101587687A CN 201310158768 A CN201310158768 A CN 201310158768A CN 103267566 A CN103267566 A CN 103267566A
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Abstract
The invention discloses a piston type fiber bragg grating vibrating sensor. The piston type fiber bragg grating vibrating sensor comprises a vibrating body head, a vibrating body middle portion, a measurement grating, a vibrating body inner portion and a vibrator; a through hole and a groove are formed in one end of the vibrating body middle portion, and one end of the groove is connected with the vibrating body head; the vibrating body inner portion comprises a connecting rod and a simply supported beam, the measurement grating is connected with the simply supported beam, the simply supported beam is located in the groove formed in the vibrating middle portion and is connected with the vibrating body middle portion, the connecting rod penetrates through the through hole of the vibrating body middle portion, one end of the connecting rod is connected with the simply supported beam, and the other end of the connecting rod is connected with the vibrator. The piston type fiber bragg grating vibrating sensor is suitable for measurement of low-frequency vibration signals of huge buildings and water conservancy facilities, waterproof, moisture-proof, strong in electromagnet resisting ability, convenient to assemble, flexible in operation, adjustable in measuring frequency range, capable of reducing measurement errors and being manufactured easily, overall reliable, good in shock resistance and falling prevention performance, high in low-frequency signal restoration degree, and long in service life.
Description
Technical field
The present invention relates to a kind of vibration transducer, a kind of piston type optical fibre grating vibration transducer of specific design.
Background technology
Electrical sensor is used in the measurement of normal signal, though it is full-fledged, usable range is wide, but electric sensor can't overcome the short slab that outer signals such as being subject to electromagnetism is disturbed, poor stability, especially under humidity, electromagnetic interference (EMI) serious situation, electric sensor lost efficacy at short notice easily, life-span is short, can not meet the need of market.
The fiber grating measuring technique is subjected to the innate advantage of signal interference such as electromagnetism hardly with its unique optics perception principle, progresses into main flow sensing market.Significantly vibration may cause structural construction to damage even cave in, the vibration signal testing environment is poor under this situation, just require sensor antidetonation shatter-resistant performance good, stable high, especially generally be lower than the low frequency signal of 20hz, vibration amplitude is little, duration is short, very easily covered by other signals, and it is general poor to the low frequency signal reduction degree based on the vibration transducer of grating, can not accurately measure low frequency signal, so a kind of dependable performance of market in urgent need, accommodative ability of environment is strong, and low frequency signal is measured responsive vibration transducer.
Summary of the invention
Purpose of the present invention is exactly in order to address the above problem, and provides a kind of antidetonation shatter-resistant performance good, low frequency signal reduction degree height, the piston type optical fibre grating vibration transducer of long service life.
To achieve these goals, the present invention adopts following technical scheme:
A kind of piston type optical fibre grating vibration transducer, comprise the body head that shakes, the body middle part of shaking, measure grating, body inside, oscillator shake;
Described body middle part one end that shakes is opened hole and groove, and the end of slotting connects the body head that shakes;
The described body inside that shakes comprises connecting rod, free beam, measure grating and connect free beam, free beam be in the body middle part that shakes slot in the body that shakes in the middle part of be connected, through hole one end was connected in free beam in the middle part of connecting rod passed the body that shakes, other end connection oscillator.
The described body head that shakes is simultaneously opened tapped through hole, and tapped through hole is opened in oscillator one side centre, and free beam is opened three at same line thread through hole in one side.
The described body middle part that shakes comprises the body skirt section that shakes, spacing skirt body; The hole is opened in the one side center in the body skirt section that shakes, and fluting is opened threaded hole around the through hole in the groove, groove external-open threaded hole, and threaded hole is opened on the opposite of the body skirt section fluting face that shakes; Spacing skirt body is opened the hole, through hole external-open tapped through hole.
The described groove external thread hole, body skirt section that shakes is connected by straight angle screw with the body head threads through hole that shakes, and the threaded hole that open on the opposite of the body skirt section fluting face that shakes is connected by straight angle screw with spacing skirt body tapped through hole.
Described connecting rod is that two different-diameter right cylinder centers of circle coincidences are formed by fixedly connecting, and connecting rod two ends circle centre position is opened threaded hole.
Described connecting rod is in the body middle part through hole that shakes, and the threaded hole of the thick head end of connecting rod is connected by straight angle screw with the threaded hole of free beam centre, and the threaded hole of thin head end is connected by straight angle screw with the oscillator tapped through hole.
The tapped through hole on described free beam both sides is connected by straight angle screw with the body skirt section groove internal thread hole that shakes.
The through hole of described spacing skirt body is less than the through hole in the body skirt section that shakes.
Principle of work of the present invention is:
Oscillator is fixed on the object under test place, drivening rod moves reciprocatingly in the body middle part through hole that shakes during the object under test vibration, free beam vibrates thereupon under the drive of connecting rod, this vibration causes free beam to produce the dilatation of certain frequency, regular distortion causes measures the flexible of grating, thereby cause measuring the drift of grating centre wavelength, drift information and object under test vibration information have certain relation, by detecting the drift information of grating centre wavelength, can measure amplitude, frequency and the acceleration of object under test.
Beneficial effect of the present invention:
The present invention is applicable to the vibration monitoring of heavy construction and water conservancy projects, uses fiber grating as sensitive element, uses optical fiber as sensing element, waterproof and dampproof, anti-electromagnetic capability is strong, copies the piston motion structure, builds vibration transducer, make the to-and-fro movement on its maintenance vertical direction, easy to assembly, flexible operation is changed by oscillator, the frequency measurement scope of adjustable sensor reduces measuring error.
For the low frequency weak signal, with the method for the direct contact measurement object of oscillator, reduced the possibility of dropout; By different oscillators and free beam proportioning, can improve transducer sensitivity, promote the perception to low frequency signal; Whole adopt the assembly type design, use flat thumb screw to connect, reduce the dependence to glue, change oscillator fast, prolong sensor serviceable life.
The present invention uses full light path design, has reduced making sensor difficulty, has improved global reliability, and oscillator perception low frequency signal performance is strong, therefore for low frequency weak signal measurement excellent.
Description of drawings
Fig. 1 is the overall schematic of the embodiment of the invention;
Fig. 2 is the body skirt section vertical view that shakes of the embodiment of the invention;
Fig. 3 is the body skirt section front view that shakes of the embodiment of the invention.
Wherein 1 is the body head that shakes, and 2 are the body skirt section that shakes, and 3 is spacing skirt body, and 4 is free beam, and 5 for measuring grating, and 6 is connecting rod, and 7 is oscillator, and 8 is flat thumb screw.
Embodiment
The invention will be further described below in conjunction with accompanying drawing and embodiment.
A kind of piston type optical fibre grating vibration transducer comprises the body head 1 that shakes, the body middle part of shaking, measures grating 5, the body inside that shakes, oscillator 7.
The described body head 1 that shakes is right cylinder, opens two tapped through holes at the cylinder disc.
The described body middle part that shakes comprises shake body skirt section 2 and spacing skirt body 3; The shake cylinder of opened round through hole centered by the body skirt section 2, the cylinder annular end face is opened two grooves, and two groove line of symmetries are crossed the center of circle, respectively open a threaded hole in two grooves, two threaded holes of groove external-open, four threaded holes distribute with the circumference equal angles, and body skirt section 2 another annular end discs that shake are opened two threaded holes; Spacing skirt body 3 is the right cylinder of opened round through hole, and the cylinder annular end face is opened two tapped through holes, and spacing colony 3 through holes are less than body skirt section 2 through holes that shake.
The described body inside that shakes comprises connecting rod 6, free beam 4, connecting rod 6 is that two different-diameter right cylinder centers of circle coincidences are formed by fixedly connecting, threaded hole is all opened at circle centre position in two ends in connecting rod 6 circular face, free beam 4 is opened with three equidistant tapped through holes of straight line in a side, and neutral threaded hole is opened in the middle of free beam 4.
A period of time 7 is right cylinder, and circle centre position is opened tapped through hole.
Annexation of the present invention is:
All cylinder component axis coincidings connect, to measure grating 5 with epoxide-resin glue etc. and be fixed in free beam 4 perforates one side, measurement grating 5 is avoided free beam 4 tapped through holes and is fixed, both connect by flat thumb screw 8 free beam 4 in slotting in the body skirt section 2 that shakes, draw and measure grating 5, connecting rod 6 passes in body skirt section 2 through holes that shake, connecting rod 6 thick first ends are connected in the middle of the free beam 4 by straight angle screw 8, the body head 1 that shakes is connected in 2 tops, body skirt section that shake by straight angle screw 8, spacing skirt body 3 connects 2 belows, body skirt section that shake, select oscillator 7 as required, oscillator 7 usefulness straight angle screws 8 are connected in connecting rod 6 thin first ends.
Principle of work of the present invention is:
4 three screwhole positions of free beam are divided equally, middle screw stationary links 6, and the both sides screw body skirt section 2 that fixedly shakes, free beam 4 width and thickness can be selected according to actual signal, improve the specific aim of sensor.
The groove that body skirt section 2 one ends that shake design embeds free beam 4, protection sensor sensing element.
Though above-mentionedly by reference to the accompanying drawings the specific embodiment of the present invention is described; but be not limiting the scope of the invention; one of ordinary skill in the art should be understood that; on the basis of technical scheme of the present invention, those skilled in the art do not need to pay various modifications that creative work can make or distortion still in protection scope of the present invention.
Claims (8)
1. piston type optical fibre grating vibration transducer, comprise the body head that shakes, the body middle part that shakes, measure grating, body inside, oscillator shake;
It is characterized in that described body middle part one end that shakes is opened hole and groove, the end of slotting connects the body head that shakes;
The described body inside that shakes comprises connecting rod, free beam, measure grating and connect free beam, free beam be in the body middle part that shakes slot in the body that shakes in the middle part of be connected, through hole one end was connected in free beam in the middle part of connecting rod passed the body that shakes, other end connection oscillator.
2. a kind of piston type optical fibre grating vibration transducer as claimed in claim 1 is characterized in that, the described body head that shakes is simultaneously opened tapped through hole, and tapped through hole is opened in oscillator one side centre, and free beam is opened three at same line thread through hole in one side.
3. a kind of piston type optical fibre grating vibration transducer as claimed in claim 2 is characterized in that, the described body middle part that shakes comprises the body skirt section that shakes, spacing skirt body; The hole is opened in the one side center in the body skirt section that shakes, and fluting is opened threaded hole around the through hole in the groove, groove external-open threaded hole, and threaded hole is opened on the opposite of the body skirt section fluting face that shakes; Spacing skirt body is opened the hole, through hole external-open tapped through hole.
4. a kind of piston type optical fibre grating vibration transducer as claimed in claim 3, it is characterized in that, the described groove external thread hole, body skirt section that shakes is connected by straight angle screw with the body head threads through hole that shakes, and the threaded hole that open on the opposite of the body skirt section fluting face that shakes is connected by straight angle screw with spacing skirt body tapped through hole.
5. a kind of piston type optical fibre grating vibration transducer as claimed in claim 2 is characterized in that, described connecting rod is that two different-diameter right cylinder centers of circle coincidences are formed by fixedly connecting, and connecting rod two ends circle centre position is opened threaded hole.
6. a kind of piston type optical fibre grating vibration transducer as claimed in claim 5, it is characterized in that, described connecting rod is in the body middle part through hole that shakes, the threaded hole of the thick head end of connecting rod is connected by straight angle screw with the threaded hole of free beam centre, and the threaded hole of thin head end is connected by straight angle screw with the oscillator tapped through hole.
7. a kind of piston type optical fibre grating vibration transducer as claimed in claim 3 is characterized in that, the tapped through hole on described free beam both sides is connected by straight angle screw with the body skirt section groove internal thread hole that shakes.
8. a kind of piston type optical fibre grating vibration transducer as claimed in claim 3 is characterized in that, the through hole of described spacing skirt body is less than the through hole in the body skirt section that shakes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310158768.7A CN103267566B (en) | 2013-05-02 | 2013-05-02 | A kind of piston type optical fibre grating vibration transducer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310158768.7A CN103267566B (en) | 2013-05-02 | 2013-05-02 | A kind of piston type optical fibre grating vibration transducer |
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| Publication Number | Publication Date |
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| CN103267566A true CN103267566A (en) | 2013-08-28 |
| CN103267566B CN103267566B (en) | 2015-10-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310158768.7A Expired - Fee Related CN103267566B (en) | 2013-05-02 | 2013-05-02 | A kind of piston type optical fibre grating vibration transducer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105258782A (en) * | 2015-11-06 | 2016-01-20 | 山东省科学院激光研究所 | Fiber grating micro vibration sensor |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5317929A (en) * | 1991-02-07 | 1994-06-07 | Brown David A | Fiber optic flexural disk accelerometer |
| CN102147422A (en) * | 2011-01-04 | 2011-08-10 | 中国地质大学（武汉） | Servo-type fiber bragg grating (FBG) acceleration sensor |
| CN102576035A (en) * | 2009-10-23 | 2012-07-11 | 美国地震系统有限公司 | Fiber optic transducers, fiber optic accelerometers and fiber optic sensing systems |
| CN202693118U (en) * | 2012-07-26 | 2013-01-23 | 中铁二院工程集团有限责任公司 | FBG (Fiber Bragg Grating) two-dimensional vibration sensor |
| CN302576035S (en) * | 2013-04-09 | 2013-09-18 | 王群 | Wardrobe door (Chinese knot sd-033) |
| CN203310508U (en) * | 2013-05-02 | 2013-11-27 | 山东大学 | Piston type fiber grating vibration sensor |
-
2013
- 2013-05-02 CN CN201310158768.7A patent/CN103267566B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5317929A (en) * | 1991-02-07 | 1994-06-07 | Brown David A | Fiber optic flexural disk accelerometer |
| CN102576035A (en) * | 2009-10-23 | 2012-07-11 | 美国地震系统有限公司 | Fiber optic transducers, fiber optic accelerometers and fiber optic sensing systems |
| CN102147422A (en) * | 2011-01-04 | 2011-08-10 | 中国地质大学（武汉） | Servo-type fiber bragg grating (FBG) acceleration sensor |
| CN202693118U (en) * | 2012-07-26 | 2013-01-23 | 中铁二院工程集团有限责任公司 | FBG (Fiber Bragg Grating) two-dimensional vibration sensor |
| CN302576035S (en) * | 2013-04-09 | 2013-09-18 | 王群 | Wardrobe door (Chinese knot sd-033) |
| CN203310508U (en) * | 2013-05-02 | 2013-11-27 | 山东大学 | Piston type fiber grating vibration sensor |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105258782A (en) * | 2015-11-06 | 2016-01-20 | 山东省科学院激光研究所 | Fiber grating micro vibration sensor |
| CN105258782B (en) * | 2015-11-06 | 2018-04-20 | 山东省科学院激光研究所 | Optical fiber grating micro-oscillation sensing device |
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| CN103267566B (en) | 2015-10-28 |
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Granted publication date: 20151028 Termination date: 20160502 |