CN102080986B - Fiber bragg grating vibration sensing component, fiber bragg grating vibration sensing device, vibration measuring system and method - Google Patents
Fiber bragg grating vibration sensing component, fiber bragg grating vibration sensing device, vibration measuring system and method Download PDFInfo
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- CN102080986B CN102080986B CN2009102386814A CN200910238681A CN102080986B CN 102080986 B CN102080986 B CN 102080986B CN 2009102386814 A CN2009102386814 A CN 2009102386814A CN 200910238681 A CN200910238681 A CN 200910238681A CN 102080986 B CN102080986 B CN 102080986B
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Abstract
The invention discloses a fiber bragg grating vibration sensing component, which comprises a base part, an end part, a cantilever beam and a fiber bragg grating strain gauge, wherein the end part constitutes a vibration mass block; the cantilever beam is connected between the base part and the end part; the cantilever beam constitutes a vibration amplification arm; two ends of the fiber bragg grating strain gauge are fixed on the base part and the end part respectively; and the fiber bragg grating strain gauge is used for detecting the strain of the cantilever beam. The invention also relates to a fiber bragg grating vibration sensing device, a vibration measuring system and method.
Description
Technical field
The present invention relates to optical fiber grating vibration sensor parts, optical fiber grating vibration sensor device, vibration measuring system and method.
Background technology
In the prior art; The sensor of measuring vibrations commonly used comprises acceleration transducer, speed pickup and displacement transducer; Wherein acceleration transducer adopts piezoelectric crystal degree of will speed up signal transition to become charge signal; Speed pickup adopts electromagnetic induction principle that rate signal is transformed into voltage signal, and displacement transducer utilizes eddy effect that displacement signal is transformed into electric signal.But the sensor is all based on the principle that mechanical energy is converted to electric energy.When utilizing the vibration of the sensor sensing rail or sleeper, owing to there is the high-voltage power supply that forms interference source near the rail, therefore, there is the not high problem of measuring accuracy in above-mentioned electric transducer under the environment of highfield, high electric field.
And fiber-optic grating sensor has anti-electromagnetic interference (EMI), size little (the standard bare fibre is 125um), lightweight advantage.
Summary of the invention
Based on the problems referred to above the present invention is proposed.
According to an aspect of the present invention, a kind of optical fiber grating vibration sensor parts comprise: base portion; The end, said end constitutes the oscillating mass piece; The fiber grating strain sheet, the two ends of said fiber grating strain sheet are separately fixed on base portion and the end, are used to detect the strain of semi-girder; And semi-girder, said semi-girder is connected between base portion and the end, and said semi-girder constitutes vibration and amplifies arm.
Advantageously, said vibration amplification arm can be the equal strength strain beam.Further, the arm part that can form as one is amplified in said base portion, said end and said vibration.
Advantageously, the upper surface of said base portion and/or the upper surface of said end exceed the upper surface that arm is amplified in said vibration, and the two ends of said fiber grating strain sheet are separately fixed on the upper surface of upper surface and end of base portion.Particularly, the longitudinal cross-section of said integral piece has the opening that is
shape; Perhaps the longitudinal cross-section of said integral piece has rectangular aperture.
Said base portion can be fixed on the rail directly or indirectly.
Advantageously, on said end, be attached with additional mass, be used for the gross mass of adjustment end.
Optical fiber grating vibration sensor modular construction according to the present invention is simple; Dynamic response is good; Sensitivity is good, and resolution is strong, energy measurement 0.01um even micro displacement more; But, under the environment of high voltage, high-intensity magnetic field, can guarantee the undistorted and ability normal transmission of signal owing to itself possess the fiber grating characteristic.
According to a further aspect in the invention, proposed a kind of optical fiber grating vibration sensor device, it comprises: above-mentioned optical fiber grating vibration sensor parts; With the fiber Bragg grating (FBG) demodulator device, said fiber Bragg grating (FBG) demodulator device comprises light source and optical cable, and the photoconduction that wherein said optical cable sends said light source is guided to the fiber grating of said optical fiber grating vibration sensor parts; And said fiber Bragg grating (FBG) demodulator device receives from the light of fiber grating reflected back and is suitable for exporting the light of this reflected back of reflection because the electric signal of the wavelength change that said strain causes.
In accordance with a further aspect of the present invention, proposed a kind of vibration measuring system, it comprises: above-mentioned optical fiber grating vibration sensor parts; The fiber Bragg grating (FBG) demodulator device; Said fiber Bragg grating (FBG) demodulator device comprises light source and optical cable; The photoconduction that wherein said optical cable sends said light source is guided to the fiber grating of said optical fiber grating vibration sensor parts, and said fiber Bragg grating (FBG) demodulator device receives the electric signal of also exporting the variation of the light wavelength that reflects this reflected back from the light of fiber grating reflected back; And analytical equipment, said analytical equipment is confirmed the vibration amplitude and/or the vibration frequency of optical fiber grating vibration sensor parts base portion or end based on this electric signal.
Advantageously, said vibration measuring system also comprises prior-warning device, and when the vibration amplitude of optical fiber grating vibration sensor parts base portion or end surpassed predetermined amplitude and/or vibration frequency and is in outside the scheduled frequency range, this prior-warning device gave the alarm.
Advantageously; Said optical fiber grating vibration sensor parts are a plurality of; Said light source is a wideband light source; Thereby the photoconduction that optical cable sends said wideband light source is guided to the fiber grating cascaded fiber grating of each optical fiber grating vibration sensor parts, and wherein each fiber grating can reflect the light of corresponding wavelength scope in this light, and said corresponding wavelength scope does not overlap each other; Said fiber Bragg grating (FBG) demodulator device receives from the electric signal of the variation of the light wavelength of the light of each fiber grating reflected back and this reflected back of output reflection; And said analytical equipment is confirmed the vibration amplitude and/or the vibration frequency of each optical fiber grating vibration sensor parts base portion or end based on this electric signal.
Perhaps; Said optical fiber grating vibration sensor parts are a plurality of and are divided into many groups; Said light source is a wideband light source; And said optical cable is many; Thereby each root optical cable photoconduction that said wideband light source is sent fiber grating of guiding to each the optical fiber grating vibration sensor parts in corresponding optical fiber grating vibration sensor parts group fiber grating in this group of connecting wherein, wherein each fiber grating can reflect the light of corresponding wavelength scope in this light, and said corresponding wavelength scope does not overlap each other; Said fiber Bragg grating (FBG) demodulator device receives from the electric signal of the variation of the light wavelength of the light of each fiber grating reflected back and this reflected back of output reflection; And said analytical equipment is confirmed the vibration amplitude and/or the vibration frequency of each optical fiber grating vibration sensor parts base portion or end based on this electric signal.Advantageously, said many group optical fiber grating vibration sensor parts are arranged spaced apart successively.
The invention allows for a kind of rail and use Vibration-Measuring System, this system comprises: signal capture module, signal analyse block and accident alarming module, wherein, said signal capture module comprises above-mentioned optical fiber grating vibration sensor parts.
According to another aspect of the invention, proposed a kind of vibration measuring method, this method is utilized above-mentioned optical fiber grating vibration sensor parts, and said vibration measuring method may further comprise the steps: base portion is rigidly connected on the determinand; The fiber Bragg grating (FBG) demodulator device is provided, and said fiber Bragg grating (FBG) demodulator device comprises light source and optical cable; Utilize optical cable to offer fiber grating from the light of light source; The fiber Bragg grating (FBG) demodulator device receives from the light of fiber grating reflected back and exports the light of this reflected back of reflection because the electric signal of the wavelength change that said strain causes; And vibration amplitude and/or the vibration frequency of confirming this optical fiber grating vibration sensor parts base portion or end based on this electric signal.
Further, based on the vibration amplitude and/or the vibration frequency of this optical fiber grating vibration sensor parts base portion or end, can confirm the vibration amplitude and/or the vibration frequency of determinand corresponding position.
Utilize vibration measuring system of the present invention and vibration measuring method, can accurately detect vibration signal.
Description of drawings
Fig. 1 is the synoptic diagram of the vibrational structure of optical fiber grating vibration sensor parts according to an embodiment of the invention;
Fig. 2 demonstration is fixed to the synoptic diagram on the vibrational structure shown in Figure 1 with the fiber grating strain sheet;
Fig. 3 shows optical fiber grating vibration sensor parts shown in Figure 2 is installed to the for example synoptic diagram on the rail of determinand;
Fig. 4 is the synoptic diagram of modification of the vibrational structure of optical fiber grating vibration sensor parts of the present invention; With
Fig. 5 is the synoptic diagram of another modification of the vibrational structure of optical fiber grating vibration sensor parts of the present invention.
Embodiment
Pass through embodiment below, and combine accompanying drawing, do further bright specifically technical scheme of the present invention.In instructions, same or analogous drawing reference numeral is indicated same or analogous parts.Following explanation to embodiment of the present invention is intended to present general inventive concept of the present invention is made an explanation with reference to accompanying drawing, and is not to be understood that to a kind of restriction of the present invention.
Fig. 1, Fig. 2 and Fig. 3 show optical fiber grating vibration sensor parts 10 of the present invention.Particularly, Fig. 1 is the synoptic diagram of the vibrational structure of optical fiber grating vibration sensor parts of the present invention; Fig. 2 demonstration is fixed to the synoptic diagram on the vibrational structure shown in Figure 1 with the fiber grating strain sheet; Fig. 3 shows optical fiber grating vibration sensor parts shown in Figure 2 is installed to the synoptic diagram on the rail.
As depicted in figs. 1 and 2, optical fiber grating vibration sensor parts 10 comprise: base portion 1; End 2, said end constitutes the oscillating mass piece; Semi-girder 3, said semi-girder 3 are connected between base portion 1 and the end 2, and said semi-girder 3 constitutes vibration and amplifies arm; Fiber grating strain sheet 4, the two ends 4a of said fiber grating strain sheet 4,4b are separately fixed on base portion 1 and the end 2, are used to detect the strain of semi-girder.
Fiber grating strain sheet 4 can be fixed on base portion 1 and the end 2 through modes such as electric welding, adhesions.
One end 4a of fiber grating strain sheet 4 is fixed on the upper surface 1a of base portion 1, and other end 4b is fixed on the upper surface 2a of end 2, and is as shown in Figure 2, and fiber grating strain sheet 4 and semi-girder 3 upper and lower extensions abreast are so that detect the strain of semi-girder 3.
Be based on fiber grating strain sheet 4 though it is pointed out that the description of this paper,, also go for fiber grating.
Here, base portion 1 is rigidly connected on the determinand 5, and is suitable for vibrating with the vibration of determinand 5.It should be noted that being rigidly connected and both can representing directly fixingly also can represent indirect securement here, thereby as long as base portion 1 end 2 is suitable for vibrating with the vibration of determinand 5.As shown in Figure 3, in the present embodiment, base portion 1 directly is rigidly fixed in determinand 5, is used to detect the vibration of determinand 5.But, need to prove that base portion 1 also can be fixed on the determinand 5 through other intermediate indirectly.
For the ease of explanation; As shown in Figure 1; Might as well define the horizontal direction that directions X is optical fiber grating vibration sensor parts 10 (or being called Width); The Y direction is the longitudinal direction (or being called length direction) of optical fiber grating vibration sensor parts 10, and the Z direction is the short transverse (or being called thickness direction) of optical fiber grating vibration sensor parts.
In order to amplify the vibration of end 2; The upper surface 1a of base portion 1 and/or the upper surface 2a of said end 2 exceed the upper surface 3a that arm 3 is amplified in vibration; And the two ends 4a of fiber grating strain sheet 4,4b are fixing respectively or be attached on the upper surface 2a of upper surface 1a and end 2 of base portion 1, and be as shown in Figure 2.Like this, based on the amplification of end 2 vibrations, the reaction of fiber grating strain sheet 4 will be sensitive more.
In this enforcement; End 2 can offer notch 2c inwardly; Thereby the longitudinal cross-section that makes base portion 1, end 2 and vibration amplify the integral piece of arm 3 formation has the opening that is
shape; Certainly, the longitudinal cross-section of this integral piece also can have the opening that is
shape.
This integral piece also can have different forms.As shown in Figure 4, end 2 is designed to solid mass, and does not have notch 2c inwardly.Thereby the longitudinal cross-section that makes base portion 1, end 2 and vibration amplify the integral piece of arm 3 formation has rectangular aperture.
Below among Fig. 1-3 to be the principle of work of example explanation according to optical fiber grating vibration sensor parts of the present invention: when determinand 5 vibrations, base portion 1 vibration, end 2 is vibration thereupon also; Vibration is amplified arm 3 under the effect as the end 2 of mass, produces forced vibration, and vibration is amplified; Can produce a bigger reciprocal tension and compression action to fiber grating strain sheet 4 thereby vibrate amplification arm 3, thereby fiber grating produces strain, this feasible light wavelength through fiber grating changes; Pass through optical cable; With this wavelength change reflected back optical fiber grating demodulation instrument, change into electric signal, can analyze based on this electric signal.
Based on above-mentioned principle, the present invention proposes a kind of optical fiber grating vibration sensor device, it comprises: above-mentioned any optical fiber grating vibration sensor parts of mentioning; With the fiber Bragg grating (FBG) demodulator device, the fiber Bragg grating (FBG) demodulator device comprises light source and optical cable, and wherein optical cable photoconduction that light source is sent is guided to the fiber grating of optical fiber grating vibration sensor parts 10; And the fiber Bragg grating (FBG) demodulator device receives from the light of fiber grating reflected back and exports the light of this reflected back of reflection because the electric signal of the wavelength change that said strain causes.
Based on above-mentioned principle, the invention allows for a kind of vibration measuring system, comprising: above-mentioned optical fiber grating vibration sensor parts; The fiber Bragg grating (FBG) demodulator device; The fiber Bragg grating (FBG) demodulator device comprises light source and optical cable; Wherein optical cable photoconduction that light source is sent is guided to the fiber grating of optical fiber grating vibration sensor parts, and the fiber Bragg grating (FBG) demodulator device receives from the electric signal of the variation of the light wavelength of the light of fiber grating reflected back and this reflected back of output reflection; And analytical equipment, analytical equipment is confirmed the vibration amplitude and/or the vibration frequency of optical fiber grating vibration sensor parts base portion 1 or end 2 based on this electric signal.In actual conditions; The vibration amplitude of base portion 1 or end 2 with have corresponding relationship from the light wavelength changing value of fiber grating reflected back, and also there is corresponding relationship in the vibration frequency of base portion 1 or end 2 with light wavelength rate of change from the fiber grating reflected back.
Vibration measuring system also can comprise prior-warning device, and when the vibration amplitude of optical fiber grating vibration sensor parts base portion 1 or end 2 surpassed predetermined amplitude and/or vibration frequency and is in outside the scheduled frequency range, this prior-warning device gave the alarm.
Further; Optical fiber grating vibration sensor parts 10 are a plurality of; For example 20, light source is a wideband light source, thereby the photoconduction that optical cable sends wideband light source is guided to the fiber grating cascaded fiber grating of each optical fiber grating vibration sensor parts; Wherein each fiber grating can reflect the light of corresponding wavelength scope in this light, and said corresponding wavelength scope does not overlap each other; The fiber Bragg grating (FBG) demodulator device receives from the electric signal of the variation of the light wavelength of the light of each fiber grating reflected back and this reflected back of output reflection; And analytical equipment is confirmed the vibration amplitude and/or the vibration frequency of each optical fiber grating vibration sensor parts base portion 1 or end 2 based on this electric signal.
Alternatively, the optical fiber grating vibration sensor parts are a plurality of, for example 60, and be divided into many groups; For example 3 groups, 20 every group, light source is a wideband light source; And optical cable is many, for example 3, it should be noted that the number of optical fiber grating vibration sensor parts and packet count are not limited thereto.Thereby each root optical cable photoconduction that wideband light source is sent fiber grating of guiding to each the optical fiber grating vibration sensor parts in corresponding optical fiber grating vibration sensor parts group fiber grating in this group of connecting wherein; Wherein each fiber grating can reflect the light of corresponding wavelength scope in this light, and said corresponding wavelength scope does not overlap each other; The fiber Bragg grating (FBG) demodulator device receives from the electric signal of the variation of the light wavelength of the light of each fiber grating reflected back and this reflected back of output reflection; And analytical equipment is confirmed the vibration amplitude and/or the vibration frequency of each optical fiber grating vibration sensor parts base portion 1 or end 2 based on this electric signal.Advantageously, to organize the optical fiber grating vibration sensor parts arranged spaced apart successively more.
The invention still further relates to a kind of rail and use Vibration-Measuring System, comprising: signal capture module, signal analyse block and accident alarming module, wherein, said signal capture module comprises above-mentioned optical fiber grating vibration sensor parts.
The invention still further relates to a kind of vibration measuring method, it utilizes above-mentioned optical fiber grating vibration sensor parts, and said vibration measuring method may further comprise the steps:
The fiber Bragg grating (FBG) demodulator device is provided, and the fiber Bragg grating (FBG) demodulator device comprises light source and optical cable;
Utilize optical cable to offer fiber grating from the light of light source;
The fiber Bragg grating (FBG) demodulator device receives from the light of fiber grating reflected back and obtains the electric signal of the variation of the light wavelength that reflects this reflected back; And
Confirm the vibration amplitude and/or the vibration frequency of this optical fiber grating vibration sensor parts base portion 1 or end 2 based on this electric signal.Further, based on the vibration amplitude and/or the vibration frequency of this optical fiber grating vibration sensor parts base portion 1 or end 2, can confirm the vibration amplitude and/or the vibration frequency of determinand 5 corresponding positions.
In vibration measuring system of the present invention and vibration measuring method; The optical fiber grating vibration sensor parts can be connected in series; The quantity of optical fiber grating vibration sensor parts that can series connection depends on scanning wavelength scope, number of channels, and the intensity of tested vibration signal of fiber Bragg grating (FBG) demodulator device; A general passage 20 the optical fiber grating vibration sensor parts of connecting, i.e. an optical cable 20 optical fiber grating vibration sensor parts of just can connecting.And the sensor of traditional electrical just needs corresponding 20 cables.And, in vibration measuring system of the present invention and the vibration measuring method, optical cable or Optical Fiber Transmission distance (the optical fiber grating vibration sensor parts can reach several kilometers to the fiber Bragg grating (FBG) demodulator device).Like this, in material cost, vibration measuring method of the present invention and vibration measuring system all have remarkable advantages compared to prior art in the engineering construction.
In addition, the optical fiber grating vibration sensor parts have high sensitivity.For example, traditional electric transducer can measure 10 basically adding under the situation of amplifier
-6The order of magnitude of power, and the most basic wavelength change of optical fiber grating sensing parts is 10
-9Power is 1000 times of sensitivity of traditional electric transducer.
The optical fiber grating vibration sensor parts can be applied under the working environment of highfield electric field, and this is that electric transducer can not be compared.In addition, optical fiber grating vibration sensor parts temperature tolerance good (the working temperature upper limit can reach 400 ℃-600 ℃), multiplexing capacity are strong.
Although illustrated and described embodiments of the invention; For those of ordinary skill in the art; Be appreciated that under the situation that does not break away from principle of the present invention and spirit and can change that scope of the present invention is limited accompanying claims and equivalent thereof to these embodiment.
Claims (15)
1. optical fiber grating vibration sensor parts comprise:
Base portion;
The end, said end constitutes the oscillating mass piece;
Semi-girder, said semi-girder are connected between base portion and the end, and said semi-girder constitutes vibration and amplifies arm; With
The fiber grating strain sheet, the two ends of said fiber grating strain sheet are separately fixed on base portion and the end, are used to detect the strain of semi-girder,
It is characterized in that:
The upper surface of said base portion and/or the upper surface of said end exceed the upper surface that arm is amplified in said vibration, and the two ends of said fiber grating strain sheet are separately fixed on the upper surface of upper surface and end of base portion;
The arm part that forms as one is amplified in said base portion, said end and said vibration.
2. optical fiber grating vibration sensor parts according to claim 1 is characterized in that, it is the equal strength strain beam that arm is amplified in said vibration.
3. optical fiber grating vibration sensor parts according to claim 1 is characterized in that,
The longitudinal cross-section of said integral piece has the upper right corner of a rectangle by the shaped aperture that cuts out a little rectangle and form.
4. optical fiber grating vibration sensor parts according to claim 1 is characterized in that,
The longitudinal cross-section of said integral piece has rectangular aperture.
5. optical fiber grating vibration sensor parts according to claim 1 is characterized in that,
Said base portion is fixed on the rail directly or indirectly.
6. optical fiber grating vibration sensor parts according to claim 1 is characterized in that,
On said end, be attached with additional mass, be used for the gross mass of adjustment end.
7. optical fiber grating vibration sensor device comprises:
According to each described optical fiber grating vibration sensor parts among the claim 1-6; With
The fiber Bragg grating (FBG) demodulator device, said fiber Bragg grating (FBG) demodulator device comprises light source and optical cable,
The photoconduction that wherein said optical cable sends said light source is guided to the fiber grating of said optical fiber grating vibration sensor parts; And said fiber Bragg grating (FBG) demodulator device receives from the light of fiber grating reflected back and exports the light of this reflected back of reflection because the electric signal of the wavelength change that said strain causes.
8. vibration measuring system comprises:
According to each described optical fiber grating vibration sensor parts among the claim 1-6;
The fiber Bragg grating (FBG) demodulator device; Said fiber Bragg grating (FBG) demodulator device comprises light source and optical cable; The photoconduction that wherein said optical cable sends said light source is guided to the fiber grating of said optical fiber grating vibration sensor parts, and said fiber Bragg grating (FBG) demodulator device receives the electric signal of also exporting the variation of the light wavelength that reflects this reflected back from the light of fiber grating reflected back; With
Analytical equipment, said analytical equipment are confirmed the vibration amplitude and/or the vibration frequency of optical fiber grating vibration sensor parts place's base portion or end based on this electric signal.
9. vibration measuring system according to claim 8 is characterized in that,
Said vibration measuring system also comprises prior-warning device, and when the vibration amplitude of optical fiber grating vibration sensor parts base portion or end surpassed predetermined amplitude and/or vibration frequency and is in outside the scheduled frequency range, this prior-warning device gave the alarm.
10. vibration measuring system according to claim 8 is characterized in that,
Said optical fiber grating vibration sensor parts are a plurality of, and said light source is a wideband light source,
Thereby the photoconduction that optical cable sends said wideband light source is guided to the fiber grating cascaded fiber grating of each optical fiber grating vibration sensor parts; Wherein each fiber grating can reflect the light of corresponding wavelength scope in this light, and said corresponding wavelength scope does not overlap each other;
Said fiber Bragg grating (FBG) demodulator device receives from the electric signal of the variation of the light wavelength of the light of each fiber grating reflected back and this reflected back of output reflection; And
Said analytical equipment is confirmed the vibration amplitude and/or the vibration frequency of each optical fiber grating vibration sensor parts base portion or end based on this electric signal.
11. vibration measuring system according to claim 8 is characterized in that,
Said optical fiber grating vibration sensor parts are a plurality of and are divided into many groups, and said light source is a wideband light source, and said optical cable is many,
Thereby each root optical cable photoconduction that said wideband light source is sent fiber grating of guiding to each the optical fiber grating vibration sensor parts in corresponding optical fiber grating vibration sensor parts group fiber grating in this group of connecting wherein; Wherein each fiber grating can reflect the light of corresponding wavelength scope in this light, and said corresponding wavelength scope does not overlap each other;
Said fiber Bragg grating (FBG) demodulator device receives from the electric signal of the variation of the light wavelength of the light of each fiber grating reflected back and this reflected back of output reflection; And
Said analytical equipment is confirmed the vibration amplitude and/or the vibration frequency of each optical fiber grating vibration sensor parts base portion or end based on this electric signal.
12. vibration measuring system according to claim 11 is characterized in that,
Said many group optical fiber grating vibration sensor parts are arranged spaced apart successively.
13. a rail is used Vibration-Measuring System, comprising: signal capture module, signal analyse block and accident alarming module is characterized in that said signal capture module comprises each described optical fiber grating vibration sensor parts in the claim 1 to 6.
14. a vibration measuring method, it utilizes each described optical fiber grating vibration sensor parts among the claim 1-6, and said vibration measuring method may further comprise the steps:
Base portion is rigidly connected on the determinand;
The fiber Bragg grating (FBG) demodulator device is provided, and said fiber Bragg grating (FBG) demodulator device comprises light source and optical cable;
Utilize optical cable to offer fiber grating from the light of light source;
The fiber Bragg grating (FBG) demodulator device receives from the light of fiber grating reflected back and exports the light of this reflected back of reflection because the electric signal of the wavelength change that said strain causes; And
Confirm the vibration amplitude and/or the vibration frequency of this optical fiber grating vibration sensor parts base portion or end based on this electric signal.
15. vibration measuring method according to claim 14 is further comprising the steps of:
Based on the vibration amplitude and/or the vibration frequency of this optical fiber grating vibration sensor parts base portion or end, confirm the vibration amplitude and/or the vibration frequency of determinand corresponding position.
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