CN202720047U - Suspension-type fiber bragg grating vibration sensor - Google Patents
Suspension-type fiber bragg grating vibration sensor Download PDFInfo
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- CN202720047U CN202720047U CN 201220408464 CN201220408464U CN202720047U CN 202720047 U CN202720047 U CN 202720047U CN 201220408464 CN201220408464 CN 201220408464 CN 201220408464 U CN201220408464 U CN 201220408464U CN 202720047 U CN202720047 U CN 202720047U
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- fiber grating
- bragg grating
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Abstract
The utility model discloses a suspension-type fiber bragg grating vibration sensor. The sensor comprises a shell, a signal transmission fiber, a protection casing pipe, a fiber bragg grating and an oscillator. The shell is formed by a hollow screw and a cylindrical protection shell. The signal transmission fiber and the protection casing pipe which wraps the signal transmission fiber are sticked on a hollow top of the hollow screw. The fiber bragg grating is arranged on a lower end of the signal transmission fiber. The fiber bragg grating is coated with a layer of elastic polymer material. The lower end of the fiber bragg grating is connected with the oscillator through the spring. The oscillator is suspended in the sensor through the spring and is coaxial with the fiber bragg grating. An internal space of the sensor shell is filled with silicone oil. According to the utility model, a suspension type structure is adopted; the sensor is not limited by an inherent frequency of the mechanical structure where the fiber bragg grating is attached so that a measurement frequency of the sensor is greatly increased. A damping fluid is in the sensor and is used to increase measurement stability. By using the sensor of the utility model, based on an all-optical signal design, the stability is good; an anti-electromagnetic interference characteristic is possessed; waterproof performance is good; and the sensor is convenient for realizing quasi distributed multipoint real-time monitoring.
Description
Technical field
The utility model relates to a kind of suspension type optical fiber grating vibration sensor, is applicable to the health monitoring of the large scale structures such as bridge.
Background technology
Vibration is the ubiquitous phenomenon of nature, all needs vibration signal is detected in fields such as Structural Engineering, plant equipment, aviation and mining.At present, usually adopt electric class vibration transducer, but they are subject to the impact of extraneous factor, especially measurand is under some rugged surroundings such as strong electromagnetic, high temperature humidity, high-voltage large current, large noise, traditional vibration transducer is difficult to effective measurement, even can't work.
The optical fiber Bragg fiber grating has been emerging a kind of basic optical fibre device in the world since the nineties in 20th century, be used for sensory field have good endurance, anti-electromagnetic interference (EMI), little, the accurate distribution measuring of volume, moisture resistant, with many advantages such as strength information is irrelevant, can be widely used in the abominable occasion of environment.At present, based on the cantilever beam structure design, chirp phenomenon easily occurs to optical fiber raster vibration sensor in fiber grating, and transducer sensitivity is lower mostly.In order further to improve the performance of optical fiber raster vibration sensor, the someone has developed the optical fiber raster vibration sensor based on the L beam, but the free vibration decay is slow during working sensor, affects the serviceability of sensor.
The utility model content
The utility model purpose is: a kind of highly sensitive, wide frequency range, optical fiber raster vibration sensor that antijamming capability is strong are provided.
The technical solution of the utility model is: a kind of suspension type optical fiber grating vibration sensor; it comprises housing; signal transmission fiber; protective casing; fiber grating; oscillator; it is characterized in that: described housing is made of hollow screw and cylindric protecting sheathing; described housing is made of hollow screw and cylindric protecting sheathing; described cylindric protecting sheathing upper end is connected with hollow screw; lower end closed; the inside of cylindric protecting sheathing is stretched in described hollow screw lower end, and the protective casing of described signal transmission fiber and its outer wrap adopts colloid to be bonded in the hollow top of hollow screw, and fiber grating is placed in described signal transmission fiber lower end; the outside one deck elastic polymer material that applies of described fiber grating, the bottom of fiber grating links to each other with oscillator by spring.
Preferably, described elastic polymer material is column structure, places hollow screw inner, and the hollow middle hypomere size of size and hollow screw is suitable, but the two is also contactless.
Preferably, described oscillator hangs on sensor internal by spring, and coaxial with fiber grating.
Preferably, described hollow screw profile is umbrella-shaped structure, and described cylindric protecting sheathing bottom seals, and there is screw thread at the upper port place, can be connected with hollow screw by this screw thread.
Preferably, described sensor housing inner space is full of silicone oil.
Concrete operation principles of the present utility model is as follows:
At first suspension type optical fiber grating vibration sensor is fixed on the tested point place, the vibration of tested point will drive sensor outer housing and fiber grating produces vibration, and then make oscillator produce vibration by spring, and the relative fiber grating of the motion of oscillator has certain hysteresis quality, the two will produce relative motion, make the spring that connects fiber grating and oscillator produce stretching motion, can draw the suffered pulling force of fiber grating according to Hooke's law also constantly changes, and then cause the variation of fiber bragg grating center wavelength, and the variable quantity of fiber bragg grating center wavelength is directly proportional with the acceleration of oscillator, therefore just can monitor the amplitude of tested point by the situation of change of Real-Time Monitoring fiber bragg grating center wavelength, frequency and acceleration.The spring that connects fiber grating and oscillator is not only load transfer device, and the effect that increases damping is also arranged simultaneously.The silicone oil that is full of in the sensor is then as damping fluid.The utility model can be measured Oscillation Amplitude, frequency and acceleration in real time.
The utility model has the advantages that:
1. the utility model has adopted suspended structure, is not subjected to fiber grating to adhere to the restriction of physical construction natural frequency, has greatly improved the survey frequency of sensor.
2. the spring and the damping fluid silicone oil that connect fiber grating and oscillator in the utility model have all played the effect of increase damping, thereby have improved the stability of measuring, and make the further broadening in sensor amplitude versus frequency characte flat region.
3. the utility model is based on full optical signal design, good stability, and anti-electromagnetic interference (EMI), water resistance is good, is convenient to realize quasi-distributed multiple spot Real-Time Monitoring.
Description of drawings
Below in conjunction with drawings and Examples the utility model is further described:
Fig. 1 is the elevation cross-sectional view of the utility model suspension type optical fiber grating vibration sensor;
Fig. 2 is the utility model suspension type optical fiber grating vibration sensor LF-response curve map;
Fig. 3 is the utility model suspension type optical fiber grating vibration sensor high frequency response curve map.
Wherein: 1. signal transmission fiber, 2. protective casing, 3. hollow screw, 4. cylindric protecting sheathing, 5. fiber grating, 6. elastic polymer material, 7. oscillator, 8. silicone oil, 9. spring, 10. colloid.
Embodiment
Embodiment: as shown in Figure 1; the utility model comprises housing; signal transmission fiber 1, protective casing 2, fiber grating 5; oscillator 7; described housing is made of hollow screw 3 and cylindric protecting sheathing 4, and described hollow screw 3 profiles are umbrella-shaped structure, and described cylindric protecting sheathing 4 bottoms seal; there is screw thread at the upper port place, can be connected with hollow screw 3 by this screw thread.The protective casing 2 of described signal transmission fiber 1 and its outer wrap adopts colloids 10 to be bonded in the hollow top of hollow screw 3; fiber grating 5 is placed in described signal transmission fiber 1 lower end; the described fiber grating 5 outside one deck elastic polymer material 6 that apply, the bottom of fiber grating 5 links to each other with oscillator 7 by spring 9.
Elastic polymer material described in the present embodiment 6 is column structure, places hollow screw 3 inside, and the hollow middle hypomere size of size and hollow screw 3 is suitable, but the two and contactless.Elastic polymer material 6 mainly plays the effect of protection to fiber grating 5, prevent that fiber grating 5 from fractureing.
Oscillator described in the present embodiment 7 hangs on sensor internal by spring 9, and coaxial with fiber grating 5, thereby prevents that oscillator 7 from tilting.Preferably, oscillator 7 is the open column shape structure, and material is bronze; Spring 9 materials are piano wire.Described spring 9 connects fiber grating 5 and oscillator 7, can increase the Oscillation Amplitude of oscillator 7, can increase vibration damping simultaneously.
The inner space of sensor housing described in the present embodiment is full of silicone oil 8, can increase the sensor damping, widens the working sensor frequency range.
The concrete manufacturing process of present embodiment is as follows:
At first; with fiber grating 5 outer even coating one deck elastic polymer material 6, will put on protective casing 2 outside the signal transmission fiber 1 simultaneously, and carry out the two bonding; again fiber grating 5 is inserted hollow screw 3 hollow in, with colloid 10 protective casing 2 and hollow screw 3 are bonded together.Then, spring 9 one ends are connected with elastic polymer material 6, the other end is connected with oscillator 7.At last, will be full of silicone oil 8 in the cylindric protecting sheathing 4, and oscillator 7 is inserted in the silicone oil 8, cylindric protecting sheathing 4 and hollow screw 3 are tightened by screw thread, and sensor is carried out encapsulation process, prevent that silicone oil 8 from revealing.
To the performance test results of the present utility model respectively such as Fig. 2, shown in Figure 3, when detecting at the scene, at first suspension type optical fiber grating vibration sensor is fixed on the testee surface, use fiber grating dynamic demodulation instrument that the centre wavelength drift situation of fiber grating 5 is carried out Real-Time Monitoring, the Oscillation Amplitude of center wavelength variation amplitude respective sensor, the vibration frequency of the change frequency respective sensor of centre wavelength, but the acceleration measurement of while calculating sensor.
Certainly above-described embodiment only is explanation technical conceive of the present utility model and characteristics, and its purpose is to allow the people who is familiar with technique can understand content of the present utility model and according to this enforcement, can not limit protection domain of the present utility model with this.All modifications of doing according to the Spirit Essence of the utility model main technical schemes all should be encompassed within the protection domain of the present utility model.
Claims (5)
1. suspension type optical fiber grating vibration sensor; it comprises housing; signal transmission fiber (1); protective casing (2); fiber grating (5); oscillator (7); it is characterized in that: described housing is made of hollow screw (3) and cylindric protecting sheathing (4); described cylindric protecting sheathing (4) upper end is connected with hollow screw (3); base seal; the inside of cylindric protecting sheathing (4) is stretched in described hollow screw (3) lower end; described signal transmission fiber (1) adopts colloid (10) to be bonded in the hollow top of hollow screw (3) with the protective casing (2) of its outer wrap; fiber grating (5) is placed in described signal transmission fiber (1) lower end, the outside one deck elastic polymer material (6) that applies of described fiber grating (5), and the bottom of fiber grating (5) links to each other with oscillator (7) by spring (9).
2. suspension type optical fiber grating vibration sensor according to claim 1, it is characterized in that: described elastic polymer material (6) is column structure, place hollow screw (3) inside, the hollow middle hypomere size of size and hollow screw (3) is suitable, but the two and contactless.
3. suspension type optical fiber grating vibration sensor according to claim 1, it is characterized in that: described oscillator (7) hangs on sensor internal by spring (9), and coaxial with fiber grating (5).
4. suspension type optical fiber grating vibration sensor according to claim 1; it is characterized in that: described hollow screw (3) profile is umbrella-shaped structure; described cylindric protecting sheathing (4) bottom seals, and there is screw thread at the upper port place, can be connected with hollow screw (3) by this screw thread.
5. suspension type optical fiber grating vibration sensor according to claim 1, it is characterized in that: described sensor housing inner space is full of silicone oil (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220408464 CN202720047U (en) | 2012-08-17 | 2012-08-17 | Suspension-type fiber bragg grating vibration sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220408464 CN202720047U (en) | 2012-08-17 | 2012-08-17 | Suspension-type fiber bragg grating vibration sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202720047U true CN202720047U (en) | 2013-02-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220408464 Withdrawn - After Issue CN202720047U (en) | 2012-08-17 | 2012-08-17 | Suspension-type fiber bragg grating vibration sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202720047U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102829854A (en) * | 2012-08-17 | 2012-12-19 | 苏州南智传感科技有限公司 | Suspended type fiber grating vibration sensor |
| CN105974154A (en) * | 2016-06-14 | 2016-09-28 | 昆明理工大学 | High-frequency FBG acceleration sensor with stainless steel capillary and polymer sensitized structure and use method thereof |
-
2012
- 2012-08-17 CN CN 201220408464 patent/CN202720047U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102829854A (en) * | 2012-08-17 | 2012-12-19 | 苏州南智传感科技有限公司 | Suspended type fiber grating vibration sensor |
| CN105974154A (en) * | 2016-06-14 | 2016-09-28 | 昆明理工大学 | High-frequency FBG acceleration sensor with stainless steel capillary and polymer sensitized structure and use method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20130206 Effective date of abandoning: 20130918 |
|
| RGAV | Abandon patent right to avoid regrant |