CN102607691B - Using method of intrinsic fiber Fabry-Perot vibration sensor for liquid media - Google Patents
Using method of intrinsic fiber Fabry-Perot vibration sensor for liquid media Download PDFInfo
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- CN102607691B CN102607691B CN201210078547.4A CN201210078547A CN102607691B CN 102607691 B CN102607691 B CN 102607691B CN 201210078547 A CN201210078547 A CN 201210078547A CN 102607691 B CN102607691 B CN 102607691B
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Abstract
The invention relates to a using method of an intrinsic fiber Fabry-Perot vibration sensor for liquid media, which relate to the field of fiber vibration sensors and are designed for solving the problem that an extrinsic fiber Fabry-Perot vibration sensor requiring directionality of detection signals is limited in an application environment for multi-directional simultaneous detection. The intrinsic fiber Fabry-Perot vibration sensor for liquid media comprises an intrinsic fiber Fabry-Perot cavity and a cylindrical vibrator made of rigid polyvinyl chloride. The overall intrinsic fiber Fabry-Perot cavity is attached lengthwise to the outer peripheral surface of the cylindrical vibrator. The using method includes: firstly, searching a quiescent operation point; secondly, keeping the sensor to operate at the quiescent operation point, using the cylindrical vibrator to couple properties of vibration signals from all directions, and obtaining output signal synchronously changing with external dynamic vibration signal. The intrinsic fiber Fabry-Perot vibration sensor for liquid media is used for multi-directional vibration signals in liquid medium.
Description
Technical field
The present invention is for the using method of the Intrinsical Fabry-perot optical fiber vibration transducer of liquid medium, relates to optical fibre vibration sensor field.
Background technology
Applied dynamics parameter is carried out the fault of valuator device a situation arises is a kind of means of often using in monitoring field, has the meaning of positive important for the duty of real-time watch device.The power transformer of picture in electrical network is exactly a kind of effective monitoring means for the measurement of its coil Vibration Parameter.Conventional vibration survey mode mainly adopts acceleration transducer, displacement transducer and piezoelectric sensor etc. at present.Though these sensors are ripe technically, but sensor internal and all need the direct or indirect interlock circuit that is aided with around, the existence of auxiliary circuit can be subject to the interference of installation electromagnetical environment, the measurement accuracy that affects sensor even makes it cisco unity malfunction, and the sensor of traditional dependence electric signal transmission cannot be for liquid medium inside.
In recent years, utilized fiber optics technology to carry out vibration signal detection method by extensive concern.In report, main concern is Mach-Zehnder type interferometer vibration transducer, Sagnac type interferometer vibration transducer and extrinsic Fabry-perot optical fiber vibration transducer.Mach-Zehnder type interferometer vibration transducer and Sagnac type interferometer vibration transducer all need to have a reference arm to introduce, and have increased the difficulty of installation of sensors, are easily subject to the impact of surrounding environment.Extrinsic Fabry-perot optical fiber vibration transducer is to rely on the diaphragm coupling in a direction to carry out sensing, to the directive requirement of detection signal, at the multi-direction applied environment detecting simultaneously, is restricted.
Summary of the invention
The present invention seeks in order to solve in the serious environment of electromagnetic interference (EMI), overcoming Mach-Zehnder interferometer, Sagnac interferometer structure complicacy and extrinsic Fabry-perot optical fiber vibration transducer relies on the diaphragm coupling in a direction to carry out sensing, to the directive requirement of detection signal, the using method that is designed for the Intrinsical Fabry-perot optical fiber vibration transducer of liquid medium in the multi-direction simultaneously problem that the applied environment of detection is restricted, technical scheme of the present invention is:
Intrinsical Fabry-perot optical fiber vibration transducer for liquid medium comprises the cylinder oscillator that Intrinsical Fabry-perot optical fiber chamber, rigid polyvinyl chloride are made, Intrinsical Fabry-perot optical fiber chamber is that a section single-mould fiber is fused in the middle of the Fiber Bragg Grating FBG that two segment length are equal, and Intrinsical Fabry-perot optical fiber chamber is pasted on cylinder oscillator outside along cylinder oscillator length direction integral body.
The using method that is used for the Intrinsical Fabry-perot optical fiber vibration transducer of liquid medium, comprises the following steps:
Step 1: utilize DFB(distributed Feedback) laser instrument is as light source, by regulating Distributed Feedback Laser control system to make Distributed Feedback Laser output wavelength continually varying narrow band light, this group narrow band light incides the Intrinsical Fabry-perot optical fiber chamber for the Intrinsical Fabry-perot optical fiber vibration transducer of liquid medium through light path coupler, the reflected light in Intrinsical Fabry-perot optical fiber chamber incides through light path coupler the reflectance spectrum that photo amplifier obtains this group narrow band light, radius-of-curvature maximum point on bands of a spectrum between reflectance spectrum upward peak and adjacent minimum is defined as to quiescent point, control voltage corresponding to quiescent point is quiescent operation point control voltage,
Step 2: regulate and control voltage to quiescent operation point control voltage, make Intrinsical Fabry-perot optical fiber vibration transducer be operated in quiescent point, Intrinsical Fabry-perot optical fiber vibration transducer is placed in to testing liquid environment, when extraneous dynamic vibration occurs, the extraneous dynamic vibration signal of cylinder coupling all directions, chamber, Intrinsical Fabry-perot optical fiber chamber length is that single-mode optical fiber length changes generating period, cause the reflected light light intensity in Intrinsical Fabry-perot optical fiber chamber to form cyclical variation, reflected light incides photo amplifier output with the synchronous output signal changing of extraneous dynamic vibration signal through light path coupler, output signal is transferred to computing machine after gathering into digital quantity by data collecting card, computing machine departs from quiescent point to Intrinsical Fabry-perot optical fiber vibration transducer real work point simultaneously and proofreaies and correct.
The invention has the beneficial effects as follows by the Intrinsical Fabry-perot optical fiber vibration transducer for liquid medium is directly positioned over to testing liquid medium, simple installation, utilize cylinder oscillator can be coupled from the vibration signal of different directions simultaneously, the output signal that generation changes with vibration signal synchronous, realized the sensing measurement to additional excited vibration signal in liquid medium, can detect the vibration signal from sensor different directions, and in whole process, quiescent point is realized automatically and being regulated by control.
Accompanying drawing explanation
Fig. 1 is the structural drawing for the Intrinsical Fabry-perot optical fiber vibration transducer of liquid medium; Fig. 2 is that Intrinsical Fabry-perot optical fiber chamber is along the cut-open view of axis direction; Fig. 3 is the use principle figure for the Intrinsical Fabry-perot optical fiber vibration transducer of liquid medium; Fig. 4 applies from equidistant different directions the output signal schematic diagram that same frequency exciting obtains in embodiment three; Fig. 5 is Distributed Feedback Laser control system structural representation; Fig. 6 is the process flow diagram that computing machine is corrected quiescent point; Fig. 7 is the reflected light spectrogram in embodiment six; Fig. 8 is Fa-Po cavity chamber length and reflection output intensity corresponding relation curve synoptic diagram in embodiment seven.
Embodiment
Below in conjunction with Fig. 1 to Fig. 8, the specific embodiment of the present invention is described:
Embodiment one
As depicted in figs. 1 and 2, Intrinsical Fabry-perot optical fiber vibration transducer 1 for liquid medium comprises the cylinder oscillator 3 that Intrinsical Fabry-perot optical fiber chamber 2, rigid polyvinyl chloride are made, Intrinsical Fabry-perot optical fiber chamber 2 is that a section single-mould fiber 4 is fused in the middle of the Fiber Bragg Grating FBG 5 that two segment length are equal, and Intrinsical Fabry-perot optical fiber chamber 2 is pasted on the external peripheral surface of cylinder oscillator 3 along cylinder oscillator 3 length directions.As can be seen from Figure 2 single-mode fiber 4 is fused together with core segment and the clad section of Fiber Bragg Grating FBG 5.
As shown in Figure 3, the using method for the Intrinsical Fabry-perot optical fiber vibration transducer of liquid medium, comprises the following steps:
Step 1: utilize Distributed Feedback Laser as light source, by regulating Distributed Feedback Laser control system to make Distributed Feedback Laser output wavelength continually varying narrow band light, this group narrow band light incides the Intrinsical Fabry-perot optical fiber chamber for the Intrinsical Fabry-perot optical fiber vibration transducer of liquid medium through light path coupler, the reflected light in Intrinsical Fabry-perot optical fiber chamber incides through light path coupler the reflectance spectrum that photo amplifier obtains this group narrow band light, radius-of-curvature maximum point on bands of a spectrum between reflectance spectrum upward peak and adjacent minimum is defined as to quiescent point, control voltage corresponding to quiescent point is quiescent operation point control voltage,
Step 2: regulate and control voltage to quiescent operation point control voltage, make Intrinsical Fabry-perot optical fiber vibration transducer be operated in quiescent point, Intrinsical Fabry-perot optical fiber vibration transducer is placed in to testing liquid environment, when extraneous dynamic vibration occurs, the extraneous dynamic vibration signal of cylinder coupling all directions, now chamber, Intrinsical Fabry-perot optical fiber chamber length is that single-mode optical fiber length changes generating period, cause the reflected light light intensity in Intrinsical Fabry-perot optical fiber chamber to form cyclical variation, reflected light incides photo amplifier output with the synchronous output signal changing of extraneous dynamic vibration signal through light path coupler, output signal is transferred to computing machine after gathering into digital quantity by data collecting card, computing machine utilizes the DAP that VC++ writes to analyze the intensity of output signal and frequency, computing machine departs from quiescent point to Intrinsical Fabry-perot optical fiber vibration transducer real work point simultaneously and proofreaies and correct.
Embodiment two
Intrinsical Fabry-perot optical fiber vibration transducer primary cavity length for liquid medium is that single-mode fiber 4 length are 20mm, cylinder oscillator 3 is coupled apparatuses of tested vibration signal and light, its natural frequency directly has influence on the Frequency Response of sensor itself, the frequency range of the vibration signal that sensor can be tested.Cylinder vibrator material is chosen as rigid polyvinyl chloride, the frequency range 0Hz of target detection is to 5KHz, utilize finite element analysis software ANSYS to carry out the structural design of cylinder oscillator, the size of determining cylinder oscillator is long 55.3mm, internal diameter 5.3mm, external diameter 5.6mm, is pasted on cylinder oscillator 3 outsides by Intrinsical Fabry-perot optical fiber chamber 2 use acrylate.
Embodiment three
The Intrinsical Fabry-perot optical fiber vibration transducer for liquid medium that uses embodiment two to record, adopt Distributed Feedback Laser as light source, Intrinsical Fabry-perot optical fiber vibration transducer for liquid medium is placed in to the iron case that takes up liquid, utilize vibrator to apply excitation taking up liquid iron box outer wall, realize the sensing measurement to additional excited vibration signal in liquid medium.In the situation that external environment is constant, changes vibrator reference frequency output 0Hz-5KHz and can obtain sensor response output.Intrinsical Fabry-perot optical fiber vibration transducer for liquid medium can detect the vibration signal from sensor different directions, do not change in sensing station and vibrator vibration frequency situation, mobile vibrator is to four positions all around of iron box outer wall, the relative distance that guarantees each sensor and vibrator is consistent, apply exciting force, from photoelectricity, amplify output terminal and recorded identical output signal, as shown in Figure 4.
Embodiment four:
The Distributed Feedback Laser control system that the present invention uses, as shown in Figure 5, temperature or Injection Current change and can cause Distributed Feedback Laser output center wavelength to change its block diagram.Native system be take LTC1923 as core is aided with peripheral circuit, utilizes semiconductor cooler and the thermistor of Distributed Feedback Laser inside, forms temperature negative feedback closed loop control system in order to stabilized lasers actuator temperature.Can realize the linear regulation to Distributed Feedback Laser centre wavelength by controlling temperature control circuit reference voltage, temperature control system utilizes LTC1658 to receive regulation voltage as digital to analog converter, makes system can receive the input of digital voltage amount.By 80C51 single-chip microcomputer, provide digital voltage amount and send into temperature control circuit, can realize I identification regulation voltage is that 0.0002V regulates accurately, and corresponding Distributed Feedback Laser output center wavelength degree of regulation is 1pm.
Embodiment five:
Utilize computing machine to depart from quiescent point to Intrinsical Fabry-perot optical fiber vibration transducer real work point and proofread and correct, its flow process as shown in Figure 6:
Steps A: computer control Distributed Feedback Laser control system is found Intrinsical Fabry-perot optical fiber vibration transducer quiescent point, and acquisition is quiescent operation point control voltage V
q;
Step B: image data is also carried out analyzing and processing to data, to remove the real work voltage V after with the restituted signal of periodic vibration with tested vibration signal by second order digital filtering algorithm;
Step C: by V and V
qcompare, when | V-V
q| during >0.01, turn back to steps A, when | V-V
q|, turn back to step B at≤0.01 o'clock.
Embodiment six:
Distributed Feedback Laser is the extraordinary light source of monochromaticity, and by regulating the temperature of Distributed Feedback Laser inside to realize the change of laser output wavelength.The temperature control chip LTC1923 of take sets up temperature control system as core, utilizes C8051 single-chip microcomputer to write scan round driven by program temperature control system scan round Distributed Feedback Laser, makes laser output wavelength continually varying narrow band light.The Intrinsical Fa-Po cavity that this group continually varying light is incided to the Intrinsical Fabry-perot optical fiber vibration transducer for liquid medium that embodiment two records, is amplified and can be obtained this structure reflectance spectrum by photoelectricity.Intrinsical Fa-Po cavity reflectance spectrum as shown in Figure 7.Scan round obtains after reflectance spectrum, continue to regulate the output wavelength of DFB, when DFB Output of laser wavelength is through Fa-Po cavity reflective light intensity during the point of the Q in radius-of-curvature maximum place, near Q point, the linearity and depth of modulation are best, Q point is quiescent point, and the control voltage that Q point is corresponding is quiescent operation point control voltage.
Embodiment seven:
At lambda1-wavelength, stablize constant in the situation that, the reflected light light intensity of Intrinsical Fa-Po cavity can form cyclical variation along with the long variation in chamber, Fig. 8 be take the fiber grating of centre wavelength 1548.5nm in primary cavity length during as 20mm, analogous diagram when left and right changes 10um in Matlab software.When extraneous dynamic vibration signal causes that Fa-Po cavity chamber long periodicity changes, when vibration signal does not exceed modulation range, can think within the scope of this it is linear output, the output of amplifying by photoelectricity just can obtain the output signal changing with vibration signal synchronous.
Claims (3)
1. for the using method of the Intrinsical Fabry-perot optical fiber vibration transducer of liquid medium, the described Intrinsical Fabry-perot optical fiber vibration transducer (1) for liquid medium comprises Intrinsical Fabry-perot optical fiber chamber (2), the cylinder oscillator (3) that rigid polyvinyl chloride is made, Intrinsical Fabry-perot optical fiber chamber (2) is that a section single-mould fiber (4) is fused in the middle of the Fiber Bragg Grating FBG that two segment length are equal (5), Intrinsical Fabry-perot optical fiber chamber (2) is pasted on the external peripheral surface of cylinder oscillator (3) along cylinder oscillator (3) length direction integral body, the using method that is used for the Intrinsical Fabry-perot optical fiber vibration transducer of liquid medium utilizes Distributed Feedback Laser as light source, by regulating Distributed Feedback Laser control system to make Distributed Feedback Laser export one group of wavelength continually varying narrow band light, this group narrow band light incides the Intrinsical Fabry-perot optical fiber chamber for the Intrinsical Fabry-perot optical fiber vibration transducer of liquid medium through light path coupler, it is characterized in that: the using method for the Intrinsical Fabry-perot optical fiber vibration transducer of liquid medium comprises the following steps:
Step 1: the reflected light in Intrinsical Fabry-perot optical fiber chamber incides through light path coupler the reflectance spectrum that photo amplifier obtains this group narrow band light, radius-of-curvature maximum point on bands of a spectrum between reflectance spectrum upward peak and adjacent minimum is defined as to quiescent point, and control voltage corresponding to quiescent point is quiescent operation point control voltage;
Step 2: regulate and control voltage to quiescent operation point control voltage, make Intrinsical Fabry-perot optical fiber vibration transducer be operated in quiescent point, Intrinsical Fabry-perot optical fiber vibration transducer is placed in to testing liquid environment, the extraneous dynamic vibration signal of cylinder coupling all directions, chamber, Intrinsical Fabry-perot optical fiber chamber length is that single-mode optical fiber length generating period changes, the reflected light light intensity in Intrinsical Fabry-perot optical fiber chamber forms cyclical variation, reflected light incides photo amplifier output with the synchronous output signal changing of extraneous dynamic vibration signal through light path coupler, output signal is transferred to computing machine after gathering into digital quantity by data collecting card, computing machine departs from quiescent point to Intrinsical Fabry-perot optical fiber vibration transducer real work point simultaneously and proofreaies and correct.
2. using method as claimed in claim 1, it is characterized in that regulating Distributed Feedback Laser control system to make the method for Distributed Feedback Laser output wavelength continually varying narrow band light be in step 1: computer control single-chip microcomputer circulation output is controlled voltage signal to Temperature Controlling Chip LTC1923, Temperature Controlling Chip LTC1923 receives the control voltage signal of single-chip microcomputer as digital to analog converter, Temperature Controlling Chip LTC1923 controls semiconductor cooler and the thermistor of Distributed Feedback Laser inside, change the arrowband light wavelength of Distributed Feedback Laser output, make Distributed Feedback Laser output wavelength continually varying narrow band light.
3. using method as claimed in claim 1, is characterized in that step 2 Computer departs to Intrinsical Fabry-perot optical fiber vibration transducer real work point the step that quiescent point proofreaies and correct simultaneously and is:
Steps A: computer control Distributed Feedback Laser control system is found Intrinsical Fabry-perot optical fiber vibration transducer quiescent point, and acquisition is quiescent operation point control voltage V
q;
Step B: image data is also carried out analyzing and processing to data, to remove the real work voltage V after with the restituted signal of periodic vibration with tested vibration signal by second order digital filtering algorithm;
Step C: by V and V
qcompare, when | V-V
q| during >0.01, turn back to steps A, when | V-V
q|, turn back to step B at≤0.01 o'clock.
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| CN1752729A (en) * | 2005-11-03 | 2006-03-29 | 武汉理工大学 | Optical fiber raster vibration sensor of tunable matching filtering demodulation |
| CN101620003A (en) * | 2009-08-07 | 2010-01-06 | 西北工业大学 | Fiber grating Fabry-Perot cavity vibration sensor and vibration measurement system thereof |
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| US20090007652A1 (en) * | 2007-07-03 | 2009-01-08 | Baker Hughes Incorporated | Optical sensor for measuring downhole ingress of debris |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1752729A (en) * | 2005-11-03 | 2006-03-29 | 武汉理工大学 | Optical fiber raster vibration sensor of tunable matching filtering demodulation |
| CN101620003A (en) * | 2009-08-07 | 2010-01-06 | 西北工业大学 | Fiber grating Fabry-Perot cavity vibration sensor and vibration measurement system thereof |
Non-Patent Citations (4)
| Title |
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| 一种基于光纤光栅法布里-珀罗腔的低频振动传感器;成振龙等;《光子学报》;20100131;第39卷(第1期);第1.1 理论基础部分、图1、图3 * |
| 基于光纤光栅法布里-珀罗腔锁频原理的高灵敏度光纤振动传感器;张乐等;《光学学报》;20110430;第31卷(第4期);全文 * |
| 张乐等.基于光纤光栅法布里-珀罗腔锁频原理的高灵敏度光纤振动传感器.《光学学报》.2011,第31卷(第4期),全文. |
| 成振龙等.一种基于光纤光栅法布里-珀罗腔的低频振动传感器.《光子学报》.2010,第39卷(第1期),第1.1 理论基础部分、图1、图3. |
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Inventor after: Zhao Hong Inventor after: Zhang Weichao Inventor after: Liu Jie Inventor after: Wang Peng Inventor after: Song Fangchao Inventor after: Wang Song Inventor after: Liu Tong Inventor after: Li Ruihai Inventor before: Zhao Hong Inventor before: Zhang Weichao Inventor before: Liu Jie Inventor before: Wang Peng Inventor before: Song Fangchao |
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