CN109631964A - A kind of single mode optical fiber sensing probe of the two-parameter multiple groups measuring section of no gelatinization - Google Patents

A kind of single mode optical fiber sensing probe of the two-parameter multiple groups measuring section of no gelatinization Download PDF

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Publication number
CN109631964A
CN109631964A CN201910063042.2A CN201910063042A CN109631964A CN 109631964 A CN109631964 A CN 109631964A CN 201910063042 A CN201910063042 A CN 201910063042A CN 109631964 A CN109631964 A CN 109631964A
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CN
China
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optical fiber
single mode
mode optical
ceramic tube
multiple groups
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Pending
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CN201910063042.2A
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Chinese (zh)
Inventor
马天兵
訾保威
郭永存
黄友锐
凌六
凌六一
贾晓芬
杜菲
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Anhui University of Science and Technology
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Anhui University of Science and Technology
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Priority to CN201910063042.2A priority Critical patent/CN109631964A/en
Publication of CN109631964A publication Critical patent/CN109631964A/en
Pending legal-status Critical Current

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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01DMEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/26Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infra-red, visible, or ultra-violet light
    • G01D5/32Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infra-red, visible, or ultra-violet light with attenuation or whole or partial obturation of beams of light
    • G01D5/34Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infra-red, visible, or ultra-violet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
    • G01D5/353Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infra-red, visible, or ultra-violet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre
    • G01D5/3537Optical fibre sensor using a particular arrangement of the optical fibre itself
    • G01D5/35374Particular layout of the fiber
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01DMEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/26Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infra-red, visible, or ultra-violet light
    • G01D5/32Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infra-red, visible, or ultra-violet light with attenuation or whole or partial obturation of beams of light
    • G01D5/34Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infra-red, visible, or ultra-violet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
    • G01D5/353Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infra-red, visible, or ultra-violet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre
    • G01D5/3537Optical fibre sensor using a particular arrangement of the optical fibre itself
    • G01D5/3538Optical fibre sensor using a particular arrangement of the optical fibre itself using a particular type of fiber, e.g. fibre with several cores, PANDA fiber, fiber with an elliptic core or the like

Abstract

The present invention relates to a kind of single mode optical fiber sensing probes based on probe beam deflation without the double parameter multiple groups measurements of gelatinization, it is characterized by: leading to single mode optical fiber naked core in alumina ceramic tube, optical fiber is welded and fixed in the indentation, there of alumina ceramic tube two-port and processing respectively using low-temperature sealing melting point glass solder, notch welding position is that temperature strain senses section, and unwelded position is temperature sensing section.The cooperation alumina ceramic tube use of low-temperature sealing melting point glass can generate very strong cohesive force, be not in aging creep, durability is good, strong robustness;Unique processing of alumina ceramic tube package casing realizes the conduction of strain, the protection of optical fiber and simple optical fiber multiple groups sensing section two parameter measurement, realizes the decoupling of simple optical fiber temperature strain cross sensitivity, spatial resolution is high, is able to carry out and detects over long distances.

Description

A kind of single mode optical fiber sensing probe of the two-parameter multiple groups measuring section of no gelatinization
Technical field
The present invention relates to Fibre Optical Sensor instrumentation techniques fields, and in particular to one kind is double without gelatinization based on probe beam deflation The single mode optical fiber sensing probe of parameter multiple groups measuring section.
Background technique
As economy continues the development of high speed, demand of the China to the energy is increasing, in order to guarantee the exploitation peace of coal mine Entirely, it is necessary to which coal mine shaft lining is detected.Coal mine shaft lining monitoring at present is using laser plummet, photography detection technique, optical fiber light Phenomena such as grid stress mornitoring etc., the above two detection systems are complicated, and disturbing factor is numerous, deform mainly for the borehole wall, slight crack, can not Detect its internal strain;
The latter, which is detected or concatenated using adhesive type surface strain, is embedded to the borehole wall into transmission main cable, deposits in practical applications In following problems:
1, surface strain detection can not detect borehole wall internal strain, and fixed the used epoxy resin of optical fiber is in long-term stress The lower creep properties of effect eventually lead to bonded structure and lose original form and loss of function, especially in the hot wet of underground coal mine Creep is more obvious in environment;
2, concatenate into transmission main cable embedment the borehole wall can due to cable material and internal optical fiber protection structure buffer function, Lead to not accurately conduct borehole wall stress variation.If do not concatenate into main cable can due to bare fibre diameter itself small (125 μm), matter Crisp, shear resistance is excessively poor, and it is extremely low to lead to directly apply to survival rate in engineering survey;
3, when carrying out long range measurements using single mode optical fiber, one section of sensing section, one section of reference field is one group, and single group measures meeting Reference field is caused to cannot achieve accurate compensation, spatial resolution is low.
Summary of the invention
It is an object of the invention to overcome the deficiencies of the prior art and provide one kind based on probe beam deflation without the double parameters of gelatinization The single mode optical fiber sensing probe of multiple groups measuring section.
The present invention realizes that goal of the invention adopts the following technical scheme that
A kind of single mode optical fiber sensing probe based on probe beam deflation without the double parameter multiple groups measuring sections of gelatinization, including left pyrocondensation It is casing, right heat-shrinkable T bush, optical fiber, alumina ceramic tube, low-temperature sealing melting point glass (I), low-temperature sealing melting point glass (II), low Intermediate temperature sealing melting point glass (III) and low-temperature sealing melting point glass (IV).Single mode optical fiber naked core passes through alumina ceramic tube, aluminium oxide Optical fiber and alumina ceramic tube are welded and fixed with low-temperature sealing melting point glass (I), (II) for ceramic tube both ends;It is processed in ceramic tube Indentation, there with low-temperature sealing melting point glass (III), single mode optical fiber is weldingly fixed in inner holes of ceramic tubes by (IV);By heat-shrink tube It covers at ceramic tube both ends.
Preferably, a kind of single-mode optics based on probe beam deflation without the double parameter multiple groups measuring sections of gelatinization provided by the invention Fine sensing probe, on alumina ceramic tube process one section of notch, leave one section and do not process, repeated with this, number of repetition according to Depending on required measurement length.
Preferably, a kind of single-mode optics based on probe beam deflation without the double parameter multiple groups measuring sections of gelatinization provided by the invention Fine sensing probe inside leads to single single mode optical fiber, and gauge head is directly embedded to the vertical two sides borehole wall, is connected by bottom single mode optical fiber.
Preferably, the single-mode optics provided by the invention based on a kind of double parameter multiple groups measuring sections of no gelatinization of probe beam deflation Fine sensing probe, using low-temperature sealing melting point glass as binder, alumina ceramic tube is as package casing.
Preferably, a kind of single-mode optics based on probe beam deflation without the double parameter multiple groups measuring sections of gelatinization provided by the invention Fine sensing probe uses shrinkable sleeve at alumina ceramic tube both ends, prevents stress from concentrating, and protection single mode optical fiber and ceramic tube weld Socket part position.
Preferably, a kind of single-mode optics based on probe beam deflation without the double parameter multiple groups measuring sections of gelatinization provided by the invention Fine sensing probe can obtain cross-correlation peak amount of movement Δ λ by optical fiber reference field temperature strain decoupling deviceT, Δ λ ε.
The utility model has the advantages that
A kind of sensed based on probe beam deflation without the single mode optical fiber of the double parameter multiple groups measuring sections of gelatinization provided by the invention is surveyed Compared with prior art, its advantages are embodied in head:
1, binder used is not in aging creep, and durability is good;
2, it is preferably light that the cooperation alumina ceramic tube use of low-temperature sealing melting point glass, which can generate very strong cohesive force, Fibre transmitting strain, strong robustness;
3, heat-shrink tube prevents stress from concentrating, protection optical fiber and ceramic tube welding position, stable structure.
4, it is transmitted without using main cable, also avoids directly being embedded to the low situation of single mode optical fiber survival rate, using oxidation Aluminium ceramic tube is packaged, and effectively realizes the conduction of stress and the protection of optical fiber.
5, the processing of alumina ceramic tube package casing realizes simple optical fiber multiple groups sensing section two parameter measurement, avoids making Temperature-compensating is carried out with double optical fiber, realizes that the reception, transmission and temperature strain of simple optical fiber stress and thermal perturbation signal intersect Sensitive decoupling simplifies detection system structure, and spatial resolution is high, is able to carry out and detects over long distances.
6, optical fiber reference field temperature strain decoupling device obtains cross-correlation peak amount of movement and fiber optic temperature and coefficient of strain αT1, αT2, α ε 1, αε2Temperature corresponding with laser sending light and stress sensitivity βT1, βT2, βε1, βε2Between establish connection can obtain Shaft wall strain and temperature value and change location out.
Detailed description of the invention
Fig. 1 is combination assumption diagram of the invention;
Fig. 2 is detonation configuration figure of the invention;
Fig. 3 is the structure chart of alumina ceramic tube in the present invention;
Fig. 4 is the structure chart of optical fiber in the present invention;
Fig. 5 is structure chart of the low-temperature sealing melting point glass after gap position welding in the present invention;
Fig. 6 is structure chart of the low-temperature sealing melting point glass after port position welding in the present invention;
Fig. 7 is the structure chart of shrinkable sleeve in the present invention;
Fig. 8 is sensing probe pit shaft distribution schematic diagram in the present invention;
In constitutional diagram, parts list represented by the reference numerals are as follows:
1- temperature sensing section, 2- temperature strain sense section simultaneously, 3- low-temperature sealing melting point glass (I), the left shrinkable sleeve of 4-, 5- alumina ceramic tube, 6- low-temperature sealing melting point glass (III), 7- low-temperature sealing melting point glass (IV), the right shrinkable sleeve of 8-, 9- Low-temperature sealing melting point glass (II), 10- single mode optical fiber, 11- single mode optical fiber sensing probe, 12- shaft of vertical well, 13- fiber optic protection Pipe.
Specific embodiment
Explanation is further explained to the present invention below by way of specific embodiment.
The present invention provides a kind of single mode optical fiber sensing probe based on probe beam deflation without the double parameter multiple groups measuring sections of gelatinization, As shown in Figure 1, figure is the Fibre Optical Sensor gauge head of only two groups of measuring sections for the sake of convenient.It includes 5 sets of alumina ceramic tube in single mode On optical fiber naked core 10, in 5 both ends of alumina ceramic tube low-temperature sealing melting point glass (I) 3, low-temperature sealing melting point glass (II) 9 Single mode optical fiber 10 and alumina ceramic tube 5 are welded and fixed;With low-temperature sealing fusing point glass at 5 open gaps of alumina ceramic tube Single mode optical fiber 10 is weldingly fixed in 5 inner hole of alumina ceramic tube by glass (III) 6, low-temperature sealing melting point glass (IV) 7, constitutes temperature Degree, which strains, while measuring section 2 is by left heat-shrink tube 4 and 8 sets of right heat-shrink tube in 5 left and right ends of alumina ceramic tube prevents stress collection Middle damage optical fiber, will be in wherein one end incoming fiber optic reference field temperature strain decoupling device of single mode optical fiber 10.Temperature sensing section 1 Section 2 is sensed simultaneously with temperature strain in the wavelength domain of the reference signal before by temperature and stress disturbance and the measuring signal after disturbance Signal is respectively S1,S2,S3,S4
S1,S2Computing cross-correlation obtains the amount of movement Δ λ only under temperature actionT
S3,S4Computing cross-correlation obtains the amount of movement Δ λ at temperature and stressε,T
Then only by straining caused cross-correlation peak amount of movement are as follows:
Δλε=Δ λ-Δ λT (1)
Fiber optic temperature strain sensitivity measuring device measures the corresponding temperature of light of laser sending and stress sensitivity is βT1, βT2, βε1, βε2
Show that tunable laser issues strain and the temperature variation of respective wavelength light perception by above formula.
Fiber optic temperature coefficient of strain caliberating device calibrates fiber optic temperature and coefficient of strain αT1, αT2, αε1, αε2
The strain and temperature of the shaft wall of optical fiber measurement are obtained by above formula.Optical frequency domain information used in computing cross-correlation is logical The wavelength domain beat signal for crossing reference signal and measuring signal is transformed into distance domain, reference signal and measurement by Fourier transform Signal all utilizes Moving Window to choose temperature strain sensor fibre domain information at a distance from the reference optical fiber of temperature measuring section, right respectively Distance domain use of information complex Fourier inverse transformation reconvert is obtained to optical frequency domain, and Moving Window width Delta x is key parameters, It is exactly local Rayleigh Scattering Spectra signal width, which determine the spatial resolutions of Rayleigh Scattering Spectra moving distributing sensing.
Δ z is the spatial resolution of each data point, i.e.,
Δ z=c/2n Δ F (4)
Δ F is laser tuning range.Then the spatial resolution Δ x of Rayleigh Scattering Spectra moving distributing sensing is (mobile Window width) be
Δ x=N Δ z (5)
The position for surveying strain and temperature change can be obtained by spatial resolution Δ x.Pass through above (1), (2), (3), (4) And (5) formula can obtain the surveyed coal mine shaft lining of single mode optical fiber sensing probe based on probe beam deflation without the double parameter multiple groups measurements of gelatinization The strain of pit shaft and temperature value and measured position.
It is obvious to a person skilled in the art that invention is not limited to the details of the above exemplary embodiments, Er Qie In the case where without departing substantially from spirit or essential attributes of the invention, the present invention can be realized in other specific forms.Therefore, no matter From the point of view of which point, the present embodiments are to be considered as illustrative and not restrictive, and the scope of the present invention is by appended power Benefit requires rather than above description limits, it is intended that all by what is fallen within the meaning and scope of the equivalent elements of the claims Variation is included within the present invention.Any reference signs in the claims should not be construed as limiting the involved claims.
In addition, it should be understood that although this specification is described in terms of embodiments, but not each embodiment is only wrapped Containing an independent technical solution, this description of the specification is merely for the sake of clarity, and those skilled in the art should It considers the specification as a whole, the technical solutions in the various embodiments may also be suitably combined, forms those skilled in the art The other embodiments being understood that.

Claims (6)

1. a kind of single mode optical fiber sensing probe based on probe beam deflation without the double parameter multiple groups measurements of gelatinization, it is characterised in that: oxygen Change and lead to single mode optical fiber naked core in aluminium ceramic tube, both ends low-temperature sealing melting point glass solder I, II by optical fiber and alumina ceramic tube Two-port is welded and fixed, by shrinkable sleeve at ceramic tube both ends, with low-temperature sealing melting point glass III at ceramic tube institute open gap, IV is weldingly fixed on single mode optical fiber in inner holes of ceramic tubes, which is that temperature strain senses section, and unwelded position is temperature Degree sensing section, single mode optical fiber incoming fiber optic reference field temperature strain decoupling device.
2. a kind of single mode optical fiber sensing based on probe beam deflation without the double parameter multiple groups measurements of gelatinization according to claim 1 Gauge head, it is characterised in that: process one section of notch on alumina ceramic tube, leave one section and do not process, repeated with this, number of repetition Depending on required measurement length.
3. a kind of single mode optical fiber sensing based on probe beam deflation without the double parameter multiple groups measurements of gelatinization according to claim 1 Gauge head, it is characterised in that: inside lead to single single mode optical fiber, gauge head is directly embedded to the vertical two sides borehole wall.
4. a kind of single mode optical fiber sensing based on probe beam deflation without the double parameter multiple groups measurements of gelatinization according to claim 1 Gauge head, it is characterised in that: using low-temperature sealing melting point glass as binder, alumina ceramic tube is as package casing.
5. a kind of single mode optical fiber sensing based on probe beam deflation without the double parameter multiple groups measurements of gelatinization according to claim 1 Gauge head, it is characterised in that: shrinkable sleeve is used at alumina ceramic tube both ends, prevents stress from concentrating, protection single mode optical fiber and pottery Porcelain tube welding position.
6. a kind of single mode optical fiber sensing based on probe beam deflation without the double parameter multiple groups measurements of gelatinization according to claim 1 Gauge head, it is characterised in that: cross-correlation peak amount of movement Δ λ can be obtained by optical fiber reference field temperature strain decoupling deviceT, Δ λε
CN201910063042.2A 2019-01-23 2019-01-23 A kind of single mode optical fiber sensing probe of the two-parameter multiple groups measuring section of no gelatinization Pending CN109631964A (en)

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CN110579287A (en) * 2019-09-16 2019-12-17 西北大学 Optical fiber sensor packaged based on single capillary glass tube and testing method

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CN110579287A (en) * 2019-09-16 2019-12-17 西北大学 Optical fiber sensor packaged based on single capillary glass tube and testing method
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