CN101344478A - Metallic material corrosion optical fiber grating sensing head - Google Patents
Metallic material corrosion optical fiber grating sensing head Download PDFInfo
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- CN101344478A CN101344478A CNA2008100417512A CN200810041751A CN101344478A CN 101344478 A CN101344478 A CN 101344478A CN A2008100417512 A CNA2008100417512 A CN A2008100417512A CN 200810041751 A CN200810041751 A CN 200810041751A CN 101344478 A CN101344478 A CN 101344478A
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Abstract
The invention discloses a fiber grating sensing head of the corrosion of metal materials, which is characterized in that the fiber grating sensing head comprises a cylindrical shell, a plunger ring fixes a round plate of the metal materials to be detected for the corrosion at one end of the cylindrical shell, thus forming a built-in round plate structure; inner screw threads are arranged at the other end of the cylindrical shell and used for embedding a matched supporting plate with outer screw threads, a through hole is arranged in the circle center of the supporting plate, a fiber grating fixing holder is fixed outside the supporting plate and coaxial with the cylindrical shell, a pressure spring is fixed between the supporting plate and the round plate, a kicker fixedly connected with the pressure spring presses on the circle center of the round plate under the thrust force of the pressure spring, one end of a sensing fiber grating runs through the through hole of the supporting plate and the pressure spring and is fixed on the kicker, and the other end of the sensing fiber grating is fixed on the fiber grating fixing holder through an adjusting screw, extends outside the fiber grating fixing holder, and is connected with a monitoring instrument of the peak wavelength of the fiber grating reflection spectrum.
Description
Technical field
The present invention relates to fiber-optic grating sensor, particularly a kind of optical fiber grating sensing head that is used for the structural metallic materials corrosion monitoring, be mainly used in the structural steel that buildingss such as bridge, boats and ships, construction work use, the monitoring of corrosion situation takes place in ocean, river and ambient atmosphere.
Background technology
The corrosion of Corrosion of Metallic Materials, particularly steel structure material with causing the damage of buildingss such as the bridge that made up by metal material, boats and ships, construction work, brings enormous economic loss and serious social influence.To the monitoring of structural metallic materials corrosion, be to build pressing for of boundary and industry member at present.
Boats and ships, bridge etc. are in ocean, the fluvial-environment for a long time, corrode very seriously, and factor such as contained microorganism all has extremely close relation in the flowing velocity of corrosion speed and water, bubble, temperature, impact and the water.The corrosion of metal material in water mainly contains galvanic corrosion, the biological corrosion of mechanical effect burn into and chemical corrosion etc.The method that detects with a kind of galvanochemistry or biological corrosion is difficult to obtain complete extent of corrosion and corrosion speed merely.
For the aging problem of corrosion that solves structured material, speed and the degree of technology to alleviate corrosion such as people take to paint, plating, galvanochemistry.But these measures can not prevent the generation of corrosion fully.Therefore people must understand, monitor the situation that these materials are corroded at any time in antirust, so that in time take the precautionary measures.The corrosion state of metal materials such as on-line monitoring steel is grasped corrosion speed and Changing Pattern thereof, for the safe operation of guaranteeing building structure, has crucial meaning and economic worth.
In order to monitor the corrosion situation of structural metallic materials, people have proposed some technical schemes.One of technology formerly: Rutherford P, Ikegami R.Shrader J et al..Novel NDE fiber opticcorrosion sensor[C] .SPIE, 1996,2718:229～237, problem at aluminium corrosion monitoring on the aircraft, the aluminium film deposited to form clad on the optical fiber, utilize the variation of the energy trace of the output beam that detects under the light incident of different angles to understand the situation of aluminium erosion.There is the shortcoming that is difficult to Quantitative Monitoring in this technology, and complex manufacturing technology, cost height.
Formerly two of technology: Fang Zujie, fibre-optical raster sensing device for monitoring metal rust, Chinese patent 200510024173.8 (2005.8.24 is open), and ZL200520039917.9 (2006.6.21 mandate), the be corroded variation of back elasticity coefficient of the spring that utilizes fiber grating perception steel to make comes the situation of monitoring of structures steel corrosion.Document [positive Sha: Chinese laser] has been reported the experiment test result who adopts this method.But this method need adopt the form of spring for structural steel, has limited the ubiquity of using.And the structure of this sensor is not suitable for using in ocean and river.
Formerly three of technology: Fang Zujie, the fibre-optical sensing device of monitoring metal rust, Chinese patent 200510024176.1 (2005.8.24 is open), and ZL200520039916.4 (2006.6.21 mandate) utilize the birefringence effect of fiber optic loop to come the cylindrical steel of perception by the state of corrosion.The scope of this method monitoring is smaller.Birefringent variation will be insensitive after steel were corroded to a certain degree.
Summary of the invention
The present invention is in order to overcome the shortcoming of above-mentioned technology formerly, satisfy the actual demand of corrosion of metal condition monitoring better, propose a kind of metallic material corrosion optical fiber grating sensing head, that this sensing head should have is simple in structure, make characteristics such as easy, with low cost and applied widely.
Ultimate principle of the present invention is as follows:
With thickness is on the metal material thin plate to be measured of the h cylinder end face that to be fixed on an internal diameter be R, constitutes one and props up the plectane structure admittedly, as shown in Figure 1.When the thin plate middle part is subjected to top power F, plectane deformation, the amount of deflection w of mid point is relevant with the mechanical characteristic of light sheet material and thickness, satisfies following expression:
In the formula:
Be the bending strength of sheet material, wherein E and μ are the Young modulus and the Poisson ratio of material.As seen the amount of deflection w of plectane is the function of circle plate thickness, and thickness reduced after plectane was corroded, and ultimate principle of the present invention is to utilize the amount of deflection of propping up plectane admittedly to represent the corrosion condition of circular metal plate, and the variation of amount of deflection is measured with the strain of fiber grating.
According to above ultimate principle, technical solution of the present invention has following several:
One, a kind of metallic material corrosion optical fiber grating sensing head, characteristics are that its formation comprises a cylindrical tube, by trim ring the plectane of the metal material of corrosion condition to be monitored being fixed on this cylindrical tube one end forms one and props up the plectane structure admittedly, the other end of this cylindrical tube is provided with internal thread, have externally threaded back up pad and be embedded for matching, there is a through hole in the center of circle of this back up pad, the outside and described cylindrical tube in described back up pad are fixed a fiber grating holder coaxially, between this back up pad and described plectane, fix a stage clip, the head part of fixedlying connected with this stage clip relies on the center of circle of the described plectane of thrust pushing tow of stage clip, through hole and stage clip that one end of sensor fibre grating passes described back up pad are fixed on the described head part, the other end of this sensor fibre grating is fixed on the described fiber grating holder by the adjustment screw and extends outside it, for linking to each other with the monitor of fiber grating reflectance spectrum peak wavelength.
Two, a kind of metallic material corrosion optical fiber grating sensing head, characteristics are that its formation comprises a cylindrical tube, by trim ring the plectane of the metal material of corrosion condition to be monitored being fixed on this cylindrical tube one end forms one and props up the plectane structure admittedly, the other end of this cylindrical tube is provided with internal thread, have externally threaded back up pad and be embedded for matching, there is a through hole in the center of circle of this back up pad, the outside and described cylindrical tube in described back up pad are fixed a fiber grating holder coaxially, between this back up pad and described plectane, fix an extension spring, this extension spring links to each other with the center of circle of described plectane by web member, through hole and extension spring that one end of sensor fibre grating passes described back up pad are fixed on the described web member, the other end of this sensor fibre grating is fixed on the described fiber grating holder by the adjustment screw and extends outside it, for linking to each other with the monitor of fiber grating reflectance spectrum peak wavelength.
Three, a kind of metallic material corrosion optical fiber grating sensing head, characteristics are that its formation comprises a cylindrical tube, by trim ring the plectane of the metal material of corrosion condition to be monitored being fixed on this cylindrical tube one end forms one and props up the plectane structure admittedly, the other end of this cylindrical tube is provided with internal thread, have externally threaded back up pad and be embedded for matching, there is a through hole in the center of circle of this back up pad, the outside and described cylindrical tube in described back up pad are fixed a fiber grating holder coaxially, between this back up pad and described plectane, fix a stage clip, the head part of fixedlying connected with this stage clip relies on the center of circle of the described plectane of thrust pushing tow of stage clip, the sensor fibre grating is that side direction sticks on of described plectane and leaves on the circular arc of center of circle certain distance, one end of this sensor fibre grating is fixed on the described fiber grating holder by the adjustment screw and extends outside it, for linking to each other with the monitor of fiber grating reflectance spectrum peak wavelength.
Four, a kind of metallic material corrosion optical fiber grating sensing head, characteristics are that its formation comprises a cylindrical tube, by trim ring the plectane of the metal material of corrosion condition to be monitored being fixed on this cylindrical tube one end forms one and props up the plectane structure admittedly, the other end of this cylindrical tube is provided with internal thread, sacrificial vessel has and with matchingly has externally threaded back up pad and be embedded, there is a through hole in the center of circle of this back up pad, the outside and described cylindrical tube in described back up pad are fixed a fiber grating holder coaxially, between this back up pad and described plectane, fix an extension spring, this extension spring links to each other with the center of circle of described plectane by web member, the sensor fibre grating is that side direction sticks on of described plectane and leaves on the circular arc of center of circle certain distance, one end of this sensor fibre grating is fixed on the described fiber grating holder by the adjustment screw and extends outside it, for linking to each other with the monitor of fiber grating reflectance spectrum peak wavelength.
Described sensor fibre grating is sealed, is hedged off from the outer world.
Also set up a reference optical fiber grating, an end is fixed on the described fiber grating holder, and with the parallel placement of sensor fibre grating, but the other end suspends.
Characteristics of the present invention and advantage are:
(1) sensing head of the present invention is simple in structure, makes easily, and is with low cost.
(2) the present invention is applied widely.General structured material all has the sheet material kind, can the corresponding sensing head of structure fabrication according to the present invention.
(3) can be according to the corrosion scope of practical matter needs monitoring, the parameters such as length of the elasticity coefficient of design alternative spring, length, decrement (elongation) and sensor fibre grating obtain high corrosion monitoring sensitivity, or big corrosion monitoring scope.Go for the monitoring of structured material corrosion under the varying environments such as ocean, river, atmosphere.
(4) the present invention can adopt some optic fibre light paths to realize the distributed monitoring system of multiple observation points.
(5) optical fiber grating sensing head of the present invention has inherent wavelength information, has memory function, the influence of external interference and uncertain smaller.
Description of drawings
The schematic diagram of Fig. 1 metallic material corrosion optical fiber grating sensing head of the present invention;
The structural representation of Fig. 2 embodiment of the invention 1;
The structural representation of Fig. 3 embodiment of the invention 2;
The sensor fibre grating of Fig. 4 embodiment of the invention 3 and embodiment 4 is pasted synoptic diagram;
One of operational version of Fig. 5 metallic material corrosion optical fiber grating sensing head of the present invention;
Two of the operational version of Fig. 6 metallic material corrosion optical fiber grating sensing head of the present invention;
Three of the operational version of Fig. 7 metallic material corrosion optical fiber grating sensing head of the present invention.
Embodiment
The invention will be further described below in conjunction with embodiment and accompanying drawing, but should not limit protection scope of the present invention with this.
See also Fig. 2 earlier, the structural representation of Fig. 2 embodiment of the invention 1, as seen from the figure, metallic material corrosion optical fiber grating sensing head of the present invention, constitute and comprise a cylindrical tube 1, by trim ring 2 plectane 1 of the metal material of corrosion condition to be monitored being fixed on these cylindrical tube 1 one ends forms and props up the plectane structure admittedly, the other end of this cylindrical tube 1 is provided with internal thread, have externally threaded back up pad 6 and be embedded for matching, there is a through hole in the center of circle of this back up pad 6, at the outside of described back up pad 6 and described cylindrical tube 1 fixed fiber grating holder 8 coaxially, between this back up pad 6 and described plectane 1, fix a stage clip 4, the head part 5 of fixedlying connected with this stage clip 4 relies on the center of circle of the described plectane 1 of thrust pushing tow of stage clip 4, through hole and stage clip 4 that one end of sensor fibre grating 7 passes described back up pad 6 are fixed on the described head part 5, the other end of this sensor fibre grating 7 is fixed on the described fiber grating holder 8 by adjustment screw 81 and extends outside it, for linking to each other with the monitor 9 of fiber grating reflectance spectrum peak wavelength.
The course of work of apparatus of the present invention is as follows: when stage clip 4 supported plates 6 compress, produce elastic force F, make plectane 1 that deformation takes place simultaneously, produce amount of deflection w.The bounce of length of spring compressed is proportional to the decrease Δ L of spring length L, is shown below:
F＝kΔL/L (2)
K is the elasticity coefficient of spring in the formula.According to equilibrium of forces, the amount of deflection of plectane 1 center should satisfy following formula:
When plectane was corroded, its thickness h reduced.Decrease is expressed as δ h.To increase by visible its amount of deflection of following formula thereupon.Recruitment is δ w.Under the situation that the head part 5 of plectane 1 and stage clip 4 keeps contacting with each other, the increase of amount of deflection makes the decrement of stage clip 4 reduce simultaneously, satisfies to concern δ L=-δ w.According to formula (3) and this relation, can obtain the relational expression that amount of deflection w changes with circle plate thickness h.
For this variation of plectane amount of deflection, the present invention utilizes the sensor fibre grating to survey.As everyone knows, the peak wavelength λ of sensor fibre grating is the function of the suffered strain stress of optical fiber, and the λ of relation=λ is arranged between the two
0+ (1-γ) ε.γ is effective elasto-optical coefficient in the formula, for silica fibre γ=0.22 is arranged.Sensor fibre grating exceptionally straight (or tearing strain slightly) is installed in the device of the present invention, as shown in Figure 2, the note fixedly fiber lengths between sensor fibre grating two ends (head part 5 and holder 8 among the figure) is l, and after the plectane amount of deflection changed, the variable quantity of the axial strain of optical fiber was: δ ε=δ w/l.Like this, moving of fiber grating reflectance spectrum peak wavelength arranged, variation that just can perception circle plate thickness to be monitored.
Referring to Fig. 3, the structural representation of Fig. 3 embodiment of the invention 2.As seen from the figure, the present embodiment metallic material corrosion optical fiber grating sensing head, its formation comprises a cylindrical tube 1, by trim ring 2 plectane 1 of the metal material of corrosion condition to be monitored being fixed on these cylindrical tube 1 one ends forms and props up the plectane structure admittedly, the other end of this cylindrical tube 1 is provided with internal thread, have externally threaded back up pad 6 and be embedded for matching, there is a through hole in the center of circle of this back up pad 6, at the outside of described back up pad 6 and described cylindrical tube 1 fixed fiber grating holder 8 coaxially, between this back up pad 6 and described plectane 1, fix an extension spring 41, this extension spring 41 links to each other with the center of circle of described plectane 1 by web member 51, through hole and extension spring 41 that one end of sensor fibre grating 7 passes described back up pad 6 are fixed on the described web member 51, the other end of this sensor fibre grating 7 is fixed on the described fiber grating holder 8 by adjustment screw 81 and extends outside it, for linking to each other with the monitor 9 of fiber grating reflectance spectrum peak wavelength.
Present embodiment and embodiment 1 main difference are wherein to apply the spring of external force, with extension spring 41 replacement stage clips 4.Extension spring 41 is connected by the mid point of web member 51 with plectane 1.Plectane 1 is in the state of indent under the effect of extension spring 41 at the beginning of installing.Along with the increase of extent of corrosion, circle plate thickness reduces, under the effect of extension spring, and the aggravation of the depression of plectane, promptly amount of deflection increases.When adopting fiber grating monitoring plectane amount of deflection to change, the sensor fibre grating needs to adjust to the state that is in stretching prestrain with adjusting screw 81 at the beginning of installing.Along with the increase of plectane amount of deflection, the strain of sensor fibre grating reduces, and its reflection peak wavelength is also with correspondingly displacement.
The sensor fibre grating of Fig. 4 embodiment of the invention 3 and embodiment 4 is pasted synoptic diagram, the difference of this structure and Fig. 2 and structure shown in Figure 3 is that sensor fibre grating 7 is that side direction sticks on of plectane 1 to be measured and leaves on the circular arc of center certain distance, rather than vertically installs from the plectane centre.The illustration on Fig. 4 top has shown the position that the sensor fibre grating is pasted on plectane.Plectane to be monitored produces initial deformation with spring, and is same with embodiment 1 and embodiment 2.Clear among Fig. 4 in order to express, do not have the stage clip of plectane generation initial deformation or extension spring mechanism will be drawn one by one.The corrosion of plectane similarly causes the variation of its amount of deflection.According to principle of elasticity, admittedly when propping up plectane and take place going up prominent or recessed deformation, material also strain will take place on the plate level being parallel to.The size of this dependent variable and the distance dependent that leaves the plectane center.In the centre with near edge, this dependent variable trends towards zero.Maximum strain occurs in
The place, this place's dependent variable is
Therefore, this strain also is the function of plectane amount of deflection.Monitor this strain with the sensor fibre grating that sticks on this position, similarly can perception the variation of the plectane amount of deflection that causes of corrosion.
Because it is a variety of that the demodulation method of sensor fibre grating sensing signal has, so embodiment can be according to the actual conditions adjustment.
Can take following three kinds of schemes
Operational version one:
One of operational version of Fig. 5 metallic material corrosion optical fiber grating sensing head of the present invention, 101 is light source, can adopt the LED wideband light source of 1550nm wave band; 111 is the demodulating equipment of optic fiber grating wavelength signal, can adopt spectrometer or other wavelength signals demodulating equipment; 121 is coupling mechanism, can adopt 2 * 2 three-dB coupler of 1550nm wave band; 131 are aforesaid metal erosion sensing head, and the metal erosion sensing head places the actual detected environment, as in ocean, river or ambient atmosphere or the like.Connect with general single mode fiber between the various piece, when drift takes place in the centre wavelength that makes fiber grating reflect when the influence of being corroded, the optic fiber grating wavelength demodulating equipment that the coupling mechanism port inserts, can demodulate the centre wavelength of fiber grating reflection this moment, so just wavelength change be can detect, thereby the degree and the speed of metal erosion analyzed.
Operational version two:
Two of the operational version of Fig. 6 metallic material corrosion optical fiber grating sensing head of the present invention, among the figure: 14 is light source, adopts the tunable laser source of 1550nm wave band; 15 is near infrared photon detector, as gallium arsenide photoelectric cell or other; 16 are the data acquisition and processing (DAP) end, receive PC but Usage data collection links, the light intensity signal of the wavelength information of synchronous acquisition light source 14 and detector 15; 122 is coupling mechanism, can adopt 2 * 2 three-dB coupler of 1550nm wave band; 132 are aforesaid metallic material corrosion optical fiber grating sensing head of the present invention, place the actual detected environment, as in ocean, river or ambient atmosphere or the like.Connect with general single mode fiber between the various piece, data acquisition and processing (DAP) end 16 collects wavelength and power spectral line, prominent local corresponding the reflection kernel wavelength of metal erosion sensing head 132 in the spectral line.When drift takes place in the centre wavelength that makes fiber grating reflect when the influence of being corroded, data acquisition and processing (DAP) end 16 collects wavelength and the power spectral line also can be moved, at this time by reading prominent place in the spectral line, centre wavelength after can learning that the metal erosion sensing head is corroded and influencing, so just wavelength change be can detect, thereby the degree and the speed of metal erosion analyzed.
The present invention is mainly based on the strain tuning characteristic of fiber grating.Because fiber grating has similar susceptibility for the variation of environment temperature with STRESS VARIATION, so these two kinds of susceptibility must be distinguished.In structure, all adopt the temperature of a reference optical fiber grating perception corrosion sensing head, so that provide correction for this reason.
On the basis of embodiment 1, among Fig. 2, set up a reference optical fiber grating and form new embodiment, one end is fixed on the stand 8, and with the 7 parallel placements of sensor fibre grating, but the other end suspends, be not fixed on the head part 5, the reference optical fiber grating is not subjected to the stress of any stretching or compression like this.The foveal reflex wavelength and the bandwidth of reference optical fiber grating and sensor fibre grating are consistent substantially.
On the basis of embodiment 2, among Fig. 3, the install processing method of reference optical fiber grating and the foregoing description 1 the same installation.
In Fig. 4, the tail optical fiber side direction of reference optical fiber grating sticks on of plectane 1 to be measured and leaves on the circular arc of center certain distance, and the reference optical fiber grating is not subjected to the influence of plectane stress deformation like this.
During the actual use of sensor, the peak wavelength of witness mark fiber grating and sensor fibre grating.The peak wavelength of sensor fibre grating reflects the stress that it is suffered and the temperature of place environment, the temperature of the peak wavelength reflection place environment of reference optical fiber grating.When sensor fibre grating peak wavelength under the effect of temperature and stress has moved Δ λ
1, reference optical fiber grating peak wavelength under the effect of temperature has moved Δ λ
2, just the amount of movement of sensor fibre grating peak wavelength under stress is Δ λ as can be known
1-Δ λ
2Can obtain the STRESS VARIATION information that peak wavelength reflected of sensor fibre grating thus.
In actual applications, also can build distributed metal erosion monitoring system, operational version three as shown in Figure 7,102 is light source, can adopt the LED wideband light source of 1550nm wave band; 112 is the demodulating equipment of optic fiber grating wavelength signal, can adopt spectrometer or other wavelength signals demodulating equipment; 123 is coupling mechanism, can adopt 2 * 2 coupling mechanism of 1550nm wave band; 17 open the light for n road light, and the light way of opening the light can reach 16 the tunnel even 32 the tunnel; 131,132 ... 13n is aforesaid metal erosion sensing head, utilizes light to open the light, each passage of gating, and needs are measured the spectral characteristic of which sensing head, just corresponding passage are connected.According to this scheme, every road sensing head is placed on different measured zone, can realize the distributed sensing monitoring like this.
Claims (6)
1, a kind of metallic material corrosion optical fiber grating sensing head, be characterised in that its formation comprises a cylindrical tube (1), by trim ring (2) plectane (1) of the metal material of corrosion condition to be monitored being fixed on this cylindrical tube (1) one end forms and props up the plectane structure admittedly, the other end of this cylindrical tube (1) is provided with internal thread, have externally threaded back up pad (6) and be embedded for matching, there is a through hole in the center of circle of this back up pad (6), at the outside of described back up pad (6) and described cylindrical tube (1) fixed fiber grating holder (8) coaxially, between this back up pad (6) and described plectane (1), fix a stage clip (4), the head part (5) of fixedlying connected with this stage clip (4) relies on the center of circle of the described plectane of thrust pushing tow (1) of stage clip (4), through hole and stage clip (4) that one end of sensor fibre grating (7) passes described back up pad (6) are fixed on the described head part (5), the other end of this sensor fibre grating (7) is fixed on the described fiber grating holder (8) by adjustment screw (81) and extends outside it, for linking to each other with the monitor (9) of fiber grating reflectance spectrum peak wavelength.
2, a kind of metallic material corrosion optical fiber grating sensing head, be characterised in that its formation comprises a cylindrical tube (1), by trim ring (2) plectane (1) of the metal material of corrosion condition to be monitored being fixed on this cylindrical tube (1) one end forms and props up the plectane structure admittedly, the other end of this cylindrical tube (1) is provided with internal thread, have externally threaded back up pad (6) and be embedded for matching, there is a through hole in the center of circle of this back up pad (6), at the outside of described back up pad (6) and described cylindrical tube (1) fixed fiber grating holder (8) coaxially, between this back up pad (6) and described plectane (1), fix an extension spring (41), this extension spring (41) links to each other with the center of circle of described plectane (1) by web member (51), through hole and extension spring (41) that one end of sensor fibre grating (7) passes described back up pad (6) are fixed on the described web member (51), the other end of this sensor fibre grating (7) is fixed on the described fiber grating holder (8) by adjustment screw (81) and extends outside it, for linking to each other with the monitor (9) of fiber grating reflectance spectrum peak wavelength.
3, a kind of metallic material corrosion optical fiber grating sensing head, be characterised in that its formation comprises a cylindrical tube (1), by trim ring (2) plectane (1) of the metal material of corrosion condition to be monitored being fixed on this cylindrical tube (1) one end forms and props up the plectane structure admittedly, the other end of this cylindrical tube (1) is provided with internal thread, have externally threaded back up pad (6) and be embedded for matching, there is a through hole in the center of circle of this back up pad (6), at the outside of described back up pad (6) and described cylindrical tube (1) fixed fiber grating holder (8) coaxially, between this back up pad (6) and described plectane (1), fix a stage clip (4), the head part (5) of fixedlying connected with this stage clip (4) relies on the center of circle of the described plectane of thrust pushing tow (1) of stage clip (4), sensor fibre grating (7) is that side direction sticks on of described plectane (1) and leaves on the circular arc of center of circle certain distance, one end of this sensor fibre grating (7) is fixed on the described fiber grating holder (8) by adjustment screw (81) and extends outside it, for linking to each other with the monitor (9) of fiber grating reflectance spectrum peak wavelength.
4, a kind of metallic material corrosion optical fiber grating sensing head, be characterised in that its formation comprises a cylindrical tube (1), by trim ring (2) plectane (1) of the metal material of corrosion condition to be monitored being fixed on this cylindrical tube (1) one end forms and props up the plectane structure admittedly, the other end of this cylindrical tube (1) is provided with internal thread, have externally threaded back up pad (6) and be embedded for matching, there is a through hole in the center of circle of this back up pad (6), at the outside of described back up pad (6) and described cylindrical tube (1) fixed fiber grating holder (8) coaxially, between this back up pad (6) and described plectane (1), fix an extension spring (41), this extension spring (41) links to each other with the center of circle of described plectane (1) by web member (51), sensor fibre grating (7) is that side direction sticks on of described plectane (1) and leaves on the circular arc of center of circle certain distance, one end of this sensor fibre grating (7) is fixed on the described fiber grating holder (8) by adjustment screw (81) and extends outside it, for linking to each other with the monitor (9) of fiber grating reflectance spectrum peak wavelength.
5, according to each described metallic material corrosion optical fiber grating sensing head of claim 1 to 4, it is characterized in that described sensor fibre grating (7) is sealed, isolated with external environment.
6, according to each described metallic material corrosion optical fiber grating sensing head of claim 1 to 4, it is characterized in that also setting up a reference optical fiber grating, one end is fixed on the described fiber grating holder (8), and with the parallel placement of sensor fibre grating (7), but the other end suspends.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101832761A (en) * | 2010-04-30 | 2010-09-15 | 中国计量学院 | Micro-strain optical fibre sensing on-line monitoring device of high temperature pressure pipeline |
| CN115370033A (en) * | 2022-09-23 | 2022-11-22 | 北京固力同创工程科技有限公司 | Friction damper with integrated earthquake damage monitoring and friction damper monitoring system |
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2008
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101832761A (en) * | 2010-04-30 | 2010-09-15 | 中国计量学院 | Micro-strain optical fibre sensing on-line monitoring device of high temperature pressure pipeline |
| CN101832761B (en) * | 2010-04-30 | 2013-03-06 | 中国计量学院 | Micro-strain optical fibre sensing on-line monitoring device of high temperature pressure pipeline |
| CN115370033A (en) * | 2022-09-23 | 2022-11-22 | 北京固力同创工程科技有限公司 | Friction damper with integrated earthquake damage monitoring and friction damper monitoring system |
| CN115370033B (en) * | 2022-09-23 | 2024-03-29 | 北京固力同创工程科技有限公司 | Friction damper with integrated vibration damage monitoring function and friction damper monitoring system |
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