CN208536877U - A kind of fiber-optic grating sensor carrying out self diagnosis, system - Google Patents

Abstract

The utility model discloses fiber-optic grating sensor, system that one kind can carry out self diagnosis, the emergency stop mechanisms and resetting-mechanism of the sensor being respectively arranged on the base with for self diagnosis；First fiber grating is connected to the groove on pedestal top by the first optical fiber collimator, and the second fiber grating is connected to the groove on pedestal top by the second optical fiber collimator, and the emergency stop mechanism and resetting-mechanism are each attached on pedestal；Enabling to the fiber-optic grating sensor for detecting the wavelength of the first fiber grating and/or the first fiber grating by emergency stop mechanism, then self diagnosis determines the working condition of the fiber-optic grating sensor, makes the fiber-optic grating sensor be in not operating state by resetting-mechanism.The problems such as sensor-based system of the utility model is detected self by the presence or absence of light, and there are sensing elements there is no ordinary sensors, and sensing element easily damages, the service life is short, unreliable can be realized self diagnosis by the way that scram button is arranged.

Description

A kind of fiber-optic grating sensor carrying out self diagnosis, system

Technical field

The utility model relates to technical field of sensor measurement, and the fiber grating of self diagnosis can be carried out more particularly to one kind Sensor, system.

Background technique

The optical fiber sensing technology of recent decades rapid development, using passive fibre optical sensor as induction element, because its is exclusive Without pyroelectric monitor, long distance transmission, essential safety and the big advantage of power system capacity, combustible and explosive area monitoring and warning, The fields such as Mine Safety in Production, circumference security protection, military and national defense have played great effect.In certain particular fields because of Fibre Optical Sensor skill The particularity of art has played great function, and has the characteristics that Conditional electronic sensor is incomparable.

When cable breakout, optical fiber Transmission causes system detection less than return signal, is for conventional system or sensor System is judged as that Boolean value output sensor acts, and causes system erroneous judgement, brings inconvenience, while influencing production and even resulting in accident.

In addition, fast demodulation instrument can only generally carry out dynamic detection, such as vibration monitoring in monitoring system.To reach Fast demodulation purpose, the limitation in terms of software and hardware, causes the low precision of Wavelength demodulation, can not accurately be demodulated, to precision When demanding sensor demodulates, there are data fluctuations.

Utility model content

In order to solve the deficiencies in the prior art, the utility model provides a kind of optical fiber grating sensing that can carry out self diagnosis Device, in conjunction with Characteristics of Fiber Bragg Gratings, with self-diagnostic function, it can be achieved that the positioning function of optical cable damage.

A kind of fiber-optic grating sensor carrying out self diagnosis, the sensor are respectively arranged on the base with for autodiagnosis Disconnected emergency stop mechanism and resetting-mechanism；

First fiber grating is connected to the groove on pedestal top by the first optical fiber collimator, and the second fiber grating passes through the Two optical fiber collimators are connected to the groove on pedestal top, and the emergency stop mechanism and resetting-mechanism are each attached on pedestal；

By emergency stop mechanism enable to the fiber-optic grating sensor for detect the first fiber grating and/or the first optical fiber Then self diagnosis determines the working condition of the fiber-optic grating sensor to the wavelength of grating, makes the fiber grating by resetting-mechanism Sensor is in not operating state.

Further preferred technical solution, the emergency stop mechanism include the spring guide groove being provided in pedestal and emergency stop by Scram button is arranged in the scram button connecting rod in the guide groove of button connecting rod, and the scram button connecting rod passes through screw thread It is connect with scram button, the scram button connection rod structure is stepped cylinder shape structure.

Further preferred technical solution, the scram button connecting rod major diameter inside are equipped with cylinder shape groove and in major diameter Cylinder periphery is provided with light passing slot, and major diameter cylinder periphery is also symmetrically arranged with for carrying out the convex of locking to scram button connecting rod It rises, which is equipped with o-ring groove；Scram button connecting rod is capped and pedestal is wrapped up and be can be carried out Sliding.

Further preferred technical solution is provided with the first spring in the spring guide groove, is located at below upper cover, and Chassis interior, the lower part of the first spring and the lower contacts in chassis interior spring guide groove, for providing scram button and urgency Stop button connecting rod rebound elastic force.

Further preferred technical solution, the two sides of the pedestal are symmetrically arranged with resetting-mechanism, the resetting-mechanism packet The reset button connecting rod for including reset button and being attached thereto, the reset button connecting rod are fixed on pedestal by fixing seat Side.

Further preferred technical solution, reset button connecting rod and scram button connecting rod spatially vertical distribution.

Further preferred technical solution is provided with second spring between the reset button connecting rod and fixing seat, the Two springs keep reset button connecting rod to have the pressure for compressing scram button connecting rod.

Further preferred technical solution, second fiber grating one end is directly hanging or is encapsulated in enhanced sensitivity platform On.

A kind of working method for the fiber-optic grating sensor carrying out self diagnosis, including

Scram button is by downward pressure, and the first spring is compressed at this time, and scram button connecting rod is to spring-compressed side To movement, the first optical fiber collimator can be blocked in moving process, finally be blocked completely；

The itself to be pressurized after first optical fiber collimator blocks completely, if scram button continues stress, inside fixing seat Two springs can be mobile to the direction for restoring oneself state, while driving reset button connecting rod mobile, and connect from scram button Major diameter slides into path outside bar, carries out locking to scram button connecting rod；

In a latched condition, while outside two reset button are drawn, are played outside the reset button connecting rod of latch functions at this time It moves, compresses second spring, first spring itself is in pressured state, and deformation occurs to itself direction is restored for meeting, and reset button connects Extension bar, which continues outer move, can lose locking effect, and scram button, scram button connecting rod are restored to sensing under the drive of the first spring State when device is not operating.

The purpose of this utility model second is that disclose a kind of fiber Bragg grating sensor system that can carry out self diagnosis, including Several sensor groups, every group of sensor pass through splitter and are connected to fiber Bragg grating (FBG) demodulator, the fiber Bragg grating (FBG) demodulator with PLC controller communicates, and the sensor in every group of sensor is the above-mentioned fiber-optic grating sensor for carrying out self diagnosis；

When sensor is not operating, fiber Bragg grating (FBG) demodulator solution is transferred to the letter of the first fiber grating and the second optic fiber grating wavelength Breath；

When sensor actuation, scram button is mobile to spring-compressed direction by downward pressure scram button connecting rod, The first optical fiber collimator is blocked in moving process, until blocking completely；

Scram button continues stress, and reset button connecting rod is mobile, and slides into from scram button connecting rod outer projection Major diameter carries out locking to scram button connecting rod, is only capable of receiving the wave of the first fiber grating at this time on fiber Bragg grating (FBG) demodulator It is long；

Under sensor lockup state, while two reset button are drawn outside, the reset button for playing latch functions at this time connects It is moved outside extension bar, compresses second spring, first spring itself is in pressured state, and deformation occurs to itself direction is restored for meeting, resets Button connecting rod, which continues outer move, can lose locking effect, and scram button, scram button connecting rod are restored under the drive of the first spring To state of sensor when not operating.

Further preferred technical solution, when sensor is not operating, when fiber Bragg grating (FBG) demodulator internal light source issues broadband After laser, laser reaches transmission cable by optical cable, optical fiber splitter and reaches the first fiber grating, meets the first fiber grating The light of wavelength carry out reflection backtracking to (FBG) demodulator, the light of remaining wavelength continues to be transferred to the first optical fiber collimator and lead to Scram button connecting rod groove is crossed, the second optical fiber collimator, the second fiber grating is reached, meets the wave of the second fiber grating at this time Length can reflect and backtracking is to (FBG) demodulator.

Compared with prior art, the utility model has the beneficial effects that

The sensor-based system of the utility model is detected self by the presence or absence of light, and there is no ordinary sensors there is sensitivity Element, and the problems such as sensing element easily damages, the service life is short, unreliable, it can be realized self diagnosis by the way that scram button is arranged.

The utility model combination Characteristics of Fiber Bragg Gratings proposes a kind of fiber grating multi-parameter sensing system of self-diagnosable System, which can carry out multi-parameter, large capacity, quasi-distributed monitoring characteristics, can in a variety of environment such as oil storage tank, coal mine into Row application.

Detailed description of the invention

The accompanying drawings constituting a part of this application is used to provide further understanding of the present application, and the application's shows Meaning property embodiment and its explanation are not constituted an undue limitation on the present application for explaining the application.

Fig. 1 (a) is the application sensor main view；

Fig. 1 (b) is the application sensor side view；

Fig. 2 (a) is the application sensor top view；

Fig. 2 (b) is the application sensor B to cross-sectional view；

Fig. 2 (c) is the application sensors A to cross-sectional view；

Fig. 3 is the application sensor three dimensional structure diagram；

Fig. 4 (a)-Fig. 4 (c) is the application sensor three-view diagram；

Fig. 5 is the system schematic using the application sensor；

Fig. 6 (a)-Fig. 6 (c) is different conditions side sectional view when the application sensor scram button is pressed；

Fig. 7 (a)-Fig. 7 (c) is different conditions forward direction cross-sectional view when the application sensor scram button is pressed；

Fig. 8 is connecting-piece structure schematic diagram；

Fig. 9 is superstructure schematic diagram；

Figure 10 is scram button connecting rod structural schematic diagram；

Figure 11 (a)-Figure 11 (c) is schematic diagram of base structure；

Figure 12 (a)-Figure 12 (c) is protective cover structure diagram；

Figure 13 (a)-Figure 13 (c) is reset button connecting rod structural schematic diagram；

Figure 14 (a)-Figure 14 (c) is fixed seat structure schematic diagram；

Working state figure when Figure 15 arranges two sensors；

In figure, 1 transmission fiber, 2 optical cables (be free of optical fiber), 3 optical cable anchor tips, 4 connectors, 5 upper covers, 6 scram buttons, 7 scram button connecting rods, 8 pedestals, 9 protective cases, 10 cushion rubber bumpers, 11 plain cushions, 12 installation fixing bolts, 13 reset button, 14 Reset button connecting rod, 15 fixing seats, 16 cage bolts, 17 first springs, 18 first sealing rings, 19 second springs, 20 The fixed spiral shell of one fiber grating, 21 first optical fiber collimators, 22 second sealing rings, 23 second optical fiber collimators, 24 enhanced sensitivity platforms Bolt, 25 second fiber gratings, 26 enhanced sensitivity platforms.

Specific embodiment

It is noted that described further below be all exemplary, it is intended to provide further instruction to the application.Unless another It indicates, all technical and scientific terms used herein has usual with the application person of an ordinary skill in the technical field The identical meanings of understanding.

It should be noted that term used herein above is merely to describe specific embodiment, and be not intended to restricted root According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singular Also it is intended to include plural form, additionally, it should be understood that, when in the present specification using term "comprising" and/or " packet Include " when, indicate existing characteristics, step, operation, device, component and/or their combination.

In a kind of typical embodiment of the application, which discloses a kind of optical fiber light that can carry out self diagnosis Gate sensor, as shown in Fig. 1 (a)-Fig. 1 (b), which includes that transmission fiber 1, optical cable (without optical fiber) 2, optical cable fixation connect First 3, connector 4, upper cover 5, scram button 6, scram button connecting rod 7, pedestal 8, protective case 9, cushion rubber bumper 10, plain cushion 11, Install fixing bolt 12, reset button 13, reset button connecting rod 14, fixing seat 15, cage bolt 16, the first spring 17, First sealing ring 18, second spring 19, as shown in Fig. 2 (a)-Fig. 2 (c), further includes: the first fiber grating 20, the first optical fiber are quasi- Straight device 21, the second sealing ring 22, the second optical fiber collimator 23, enhanced sensitivity platform fixing bolt 24, the second fiber grating 25, enhanced sensitivity are flat Platform 26.

Overall three-dimensional view is as shown in figure 3, shown in whole three-view diagram such as Fig. 4 (a)-Fig. 4 (c).

Transmission fiber 1 is single mode optical fiber, and 1 one end of transmission fiber connects (FBG) demodulator, and the other end is equipped with the first fiber grating 20, The other end of first fiber grating 20 is soldered to the first optical fiber collimator 21.First optical fiber collimator 21 and the second optical fiber collimator 23 are arranged in the groove of pedestal 8.

Optical cable 2 is one, for protecting transmission fiber 1；Optical cable anchor tip 3 is one, has locking optical cable and connects To connector 4.

As shown in figure 8, connector 4 is two, each one of left and right, top is equipped with screw thread, for fixing optical cable anchor tip 3, the lower part hole Kai Liang is fixed by bolt and pedestal 8.

It is one as shown in figure 9, upper cover 5, if interstitial hole is used to across scram button connecting rod 7 there are two types of hole, another 4 Aperture is fixed by installation fixing bolt 12 and pedestal 8.

Scram button 6 is one, is connect by screw thread with 7 scram button connecting rods.Sensor actuation can be made by pressing.

As shown in Figure 10, scram button connecting rod 7 is one, and scram button connecting rod is the class multi-diameter shaft that diameter does not wait, Two axis are concentric, and major diameter cylindrical inside is equipped with cylinder shape groove and the periphery of the cylinder in major diameter is provided with light passing slot, constitute guiding knot Structure, the outside of major diameter cylinder are also symmetrically arranged with the protrusion that locking effect is played when moving down to the scram button connecting rod.

The top of the cylinder of major diameter is provided with o-ring groove, and o-ring groove is used to place the second sealing ring 22, be used to The sliding contact surface of scram button connecting rod 7 and pedestal 8 is sealed, the cylinder of major diameter is capped 5 pedestals 8 package and carries out sliding and rubs It wipes.

As shown in figure 11, pedestal 8 are one, and inside is equipped with spring guide groove, for accommodating and stablizing the first spring 17, The pedestal is additionally provided with guide groove matched with 7 scram button connecting rod guide frames.

As shown in Figure 12 (a)-Figure 12 (c), protective case 9 is one, connect by screw thread with connector 4, internal equipped with the Two fiber gratings 25, enhanced sensitivity platform 26.

Cushion rubber bumper 10, be two, cover installation fixing bolt 12 on, material can be rubber or other padded coamings, Realize buffering simultaneously, elasticity itself makes installation fixing bolt 12 be provided with anti-avulsion function.Plain cushion 11, two.

Fixing bolt 12 is installed, is 6, to be installed for fixing cushion rubber bumper and being fixed on entire sensor On component；Connector 4 and pedestal 8 are fixed simultaneously.

Reset button 13 is two, is connect by screw thread with reset button connecting rod 14, needed when restoring sensor states It is outer simultaneously to draw two reset button；It is vertical relation between reset button connecting rod and scram button connecting rod.

As shown in Figure 13 (a)-Figure 13 (c), reset button connecting rod 14 is two, and reset button connecting rod passes through fixation Seat 15 is fixed on the base, and second spring 19 is equipped between fixing seat 15 and reset button connecting rod 14.

As shown in Figure 14 (a)-Figure 14 (c), fixing seat 15 is two, is located at 8 two sides of pedestal, passes through cage bolt 16 It is fixed on 8 two sides of pedestal；Cage bolt 16 is 8, for fixing fixing seat 15.

First spring 17 is 2, is located at below 5 upper covers that inside pedestal 8, lower part is at 8 chassis interior spring guide groove bottoms Portion, top are contacted with 7 bottom of scram button connecting rod.First spring 17 provides 6 scram buttons and 7 scram button connecting rods are sprung back Elastic force；

First sealing ring 18 is 2, slides between reset button connecting rod 14 and fixing seat 15, for being sealed；

Second spring 19 is 2, is located inside reset button connecting rod 14 and fixing seat 15, keeps reset button connection Bar 14 has the pressure for compressing scram button connecting rod 7；

First fiber grating 20 is 1, is located at transmission fiber 1；First optical fiber collimator 21, be one, and with transmission light Fibre 1 is welded；Second sealing ring 22 is one, covers in 7 scram button connecting rod lower exterior faces, in scram button connecting rod 7 It is sealed when being slided with upper cover 5, good seal can guarantee that dust cannot be introduced into sensor internal, avoid pollution the first optical fiber The mirror surface of collimator 21 and the second optical fiber collimator 23.

Second optical fiber collimator 23 is 1, and the other end welds the second fiber grating 25；Second fiber grating 25, installation side There are two types of formulas, directly hanging or be encapsulated on 26 enhanced sensitivity platforms, if being encapsulated on 26 enhanced sensitivity platforms, needs 24 enhanced sensitivity platforms solid Determine bolt to be fixed.

In a kind of typical embodiment of the application, which discloses a kind of optical fiber light that can carry out self diagnosis Grid sensor-based system, as shown in figure 5, by groups such as fiber Bragg grating (FBG) demodulator, sensor, transmission cable, communication cable, optical fiber splitters At.

It is connected between sensor and splitter by optical cable.More sensors collect at splitter, and by optical cable with Fiber Bragg grating (FBG) demodulator connection.Fiber Bragg grating (FBG) demodulator is communicated by connection and PLC.

Functions:

Information is simultaneously changed into the information, optical fiber light such as the on-off of optic fiber grating wavelength variation and light by sensor perception information Sensor states are detected and are carried out discriminatory analysis by grid (FBG) demodulator, and monitoring information can be carried out to display simultaneous transmission to PLC Control system, and then the functions such as control for realizing equipment.

System features: the characteristics of utilizing optical fiber sensing technology and fiber grating wavelength-division multiplex, using wideband light source plus optical fiber The structure of grating compares electronic sensor, substantially increases the measurement capacity of monitoring system；Each channel is from (FBG) demodulator to branch It is only needed between device with 1 core optical cable, needs at least 2 core power supplys or signal wire relative to each sensor of electronic sensor, this is System has saved a large amount of communication cable；Sensor is not charged, is passive sensor, is suitble in combustible and explosive area application；System By reasonable disposition, with self-diagnostic function, it can be achieved that the positioning function of optical cable damage.

Above system working principle:

When sensor is not operating, such as Fig. 6 (a) and as shown in Fig. 7 (a):

According to Characteristics of Fiber Bragg Gratings.The light of self-characteristic wavelength is reflected, other wavelength lights continue to propagate.Work as optical fiber After grating demodulation instrument internal light source issues broad band laser, laser reaches transmission fiber 1 by optical cable, optical fiber splitter and reaches the One fiber grating 20, the light for meeting the wavelength of the first fiber grating 20 carry out reflection backtracking to (FBG) demodulator, remaining wavelength Light continues to be transferred to the first optical fiber collimator 21 and passes through 7 groove of scram button connecting rod, is arrived by the second optical fiber collimator 23 Up to the second fiber grating 25, the wavelength for meeting the second fiber grating 25 at this time can reflect and backtracking is to (FBG) demodulator.This is shape State one.At this point, (FBG) demodulator can solution be transferred to the information of 25 wavelength of the first fiber grating 20 and the second fiber grating.

In sensor actuation, such as Fig. 6 (b) and as shown in Fig. 7 (b):

Scram button 6 is by downward pressure, and the first spring 17 is compressed at this time, and scram button connecting rod 7 is to spring pressure Contracting direction is mobile, can block to the first optical fiber collimator 21 in moving process, finally block completely.Connect from scram button 7 stress of extension bar, which is moved to, to be carried out complete occlusion state the first optical fiber collimator 21 and is denoted as state two.

Sensor locking, such as Fig. 6 (c) and as shown in Fig. 7 (c):

If the stress of the continuation of scram button 6 at this time, the second spring 19 itself being pressurized inside fixing seat 15 can be to recovery certainly The direction of body state is mobile, while driving reset button connecting rod 14 mobile, and slide from 7 outer projection of scram button connecting rod To major diameter, locking is carried out to scram button connecting rod 7, is denoted as state three at this time.It is got at this time from the first optical fiber collimator 21 Light can not reach the second optical fiber collimator 23.Reflect on (FBG) demodulator and is only capable of receiving the wavelength of the first fiber grating 20 at this time.

Sensor restores

In a latched condition, while outside two reset button 13 are drawn, play the reset button connecting rod of latch functions at this time 14 move outside, compress second spring 19, and the first spring 17 itself is in pressured state, and to itself direction is restored, deformation occurs for meeting, multiple Position button connecting rod 14, which continues outer shifting, can lose locking effect, scram button 6, scram button connection under the drive of the first spring 17 Bar 7 be restored to sensor it is not operating when state.

In the typical embodiment of the another kind of the application, in practical applications, multi-parameter sensor realizes that switch measures Amount and temperature measurement:

System algorithm design:

1, software design sensor type, such as 01,02,03 ..., every kind of sensor type corresponds to respective sensor Algorithm, example 01 are multi-parameter sensor.

The design of multi-parameter sensor algorithm:

Sensor internal fiber grating one is that state judges grating；Fiber grating two is switching value monitoring grating, while real The monitoring of existing temperature.Because its own in addition to being affected by temperature not by external interference, temperature monitoring grating can be also served as；

When sensor is in not operating state, system monitoring is denoted as working condition to two optic fiber grating wavelengths at this time It is 1；When sensor actuation, since the first optical fiber collimator is blocked by scram button connecting rod 7, system is only capable of detecting first Fiber grating 20, definition are in working condition 2.

When two fiber gratings can't detect, working condition 3.

When being designed due to sensor itself, sensor grating and collimator element are protected by shell, and lower part is equipped with shockproof The cushion rubber bumper 10 of structure, in normal use, except actively blocking, fiber grating will not reliably be damaged at the second collimator.

Therefore when the systems are operating normally, device sensor is normally to switch between state 1 and state 2.

When optical cable damage, (FBG) demodulator can't detect grating signal, working condition 3, then can determine whether optical cable damage or There is loss problems of too in optical cable.

Example:

For 40nm wideband laser, wavelength-division multiplex function can be utilized by setting different wave length optical fiber grating, realized every Channel can connect more sensors, realize that multiple spot measures on a large scale.

Example fiber grating local environment range of temperature is 100 degrees Celsius, and optic fiber grating wavelength variation range is 1nm, every sensor configure two gratings, each lead to and can be connected to few 19 sensors, come according to 16 channel demodulation equipment It calculates, an equipment can carry 304 sensors, realize 304 switching value monitorings, while realizing the temperature detection of 304 points.

When being monitored, sensor wavelength is numbered, traveling wave of going forward side by side is long to be limited, such as working sensor range To work in -20 to 80 degree Celsius ranges, at 30 degrees Celsius, in a certain channel inner sensor number A1B1 fiber grating one The a length of 1529nm fiber grating two of cardiac wave is 1530nm, is defined the wavelength 1528.5 to 1529.5nm when software is arranged It is number A001 between wavelength；1529.5 are defined on to arrive between 1530.5nm wavelength as number B001；Similarly passed at 30 degrees Celsius It is 1532nm that one central wavelength of sensor number A2B2 fiber grating, which is 1531nm fiber grating two, when software is arranged to the wavelength into Row is defined on 1530.5 and arrives between 1531.5nm wavelength as number A002；1531.5 are defined on to arrive between 1532.5nm wavelength as volume Number B002；... it in 30 degrees Celsius of one central wavelengths of sensor number A19B19 fiber grating is that 1565nm fiber grating two is 1566nm is defined between 1564.5 to 1565.5nm wavelength as number A019 the wavelength when software is arranged；It is defined on 1565.5 arrive between 1566.5nm wavelength as number B019；

Channel number is that 01 to 16,01A1B1 represents first passage A1B1 sensor, and 16A1B1 represents the 16th channel A1B1 biography Sensor.

In sensor installation, to A1B1A2B2 ..., arrange in pairs or groups parallel with installation site by totally 19 sensors by A19B19, It shows addition detection position information in the sensor information column, realizes corresponding relationship.When system operational monitoring, sensor A10B10, whether display switch quantity sensor acts and temperature by corresponding position relationship can obtain corresponding detection position Corresponding informance.

Example:

Separately optical cable longer for length can be marked in whole optical fiber imprinting grating in place's spaced apart, answer It can detecte specific a certain position optical cable in fracture occurs or is lost excessive, wavelength-division multiplex feature utilized to realize optical cable damage The positioning function at position；

Algorithm is as follows: the first fiber grating, the second fiber grating ... fiber grating n, and being defined to wavelength shows 1528.5~1529nm of example is the first fiber grating, and 1529~1529.5nm is the second fiber grating, 1528.5~1529nm the It is spaced 100 meters between one fiber grating and the second fiber grating, always fiber grating 77,78*100=7800 meters of distance, realizes Positioning, remaining optical fiber are used to realize 1558.5~1559nm of switching value, 1559~1560.5nm, 1560.5~1561 ... 1567.5

When system only detect the first fiber grating, the second fiber grating ... when 18 fiber grating, then judge 18 fiber gratings and optical cable at the 19th fiber grating are problematic, and respective distances are that optical cable is problematic at 1900 to 2000 meters.

Example three

Collocation high speed (FBG) demodulator can realize high-frequency switching value and temperature function, and collocation low-speed highly precise (FBG) demodulator can be real Existing low frequency switch amount and temperature detecting function.

Due to (FBG) demodulator self character, high speed (FBG) demodulator demodulation accuracy is poor, and generally there are itself fluctuations of 10pm or more Error causes temperature sensor precision relatively low when realizing to temperature demodulation, for the precision for improving temperature sensor under the mode, Enhanced sensitivity can be carried out to optical fiber temperature grating two, naked grating changes about 10pm/ DEG C.The mode needs for fiber grating two to be encapsulated in On 26 enhanced sensitivity platforms.

Example:

According to sensor application range, sensor (meets in 100 degrees Celsius of working range at -20 to 80 degrees Celsius Use in most of environment), A grating wavelength in the same channel of enhanced sensitivity fiber grating.

5.5 × 10-7/ DEG C of the thermal expansion coefficient of fiber grating；18.9 × 10-7/ DEG C of thermal expansion coefficient of metal brass, by light Fine grating is fixed on the material that substrate is brass, realizes the function of enhanced sensitivity.

18.9/5.5 3.44 ≈, susceptibility increase by 3.44 times.That is in the second fiber grating under vacant state, often Degree Celsius variation 10pm, every degree Celsius of variation 34.4pm after enhanced sensitivity.When itself fluctuation is 10pm, sensor temperature detection error It is 1 degree Celsius, the grating after enhanced sensitivity, error is 0.29 degree of 10/34.4 ≈, and sensor accuracy improves 3.44 times, corresponding every channel Number of sensors is reduced.According to 40nm bandwidth, can be calculated single channel can realize the access of 9 sensors, therefore should It designs under the requirement of high-speed switch amount, the function of high-precision temperature sensor.

It in a kind of examples of implementation, is illustrated in fig. 15 shown below, arranges 2 sensors, for needing to distinguish in same monitoring point In the environment of control can apply this kind of structure, the structure no matter that sensor actuation, can all play on-off action, subtract simultaneously The characteristics of lacking fiber grating number, advantageously ensuring that each channel large capacity.

The foregoing is merely preferred embodiment of the present application, are not intended to limit this application, for the skill of this field For art personnel, various changes and changes are possible in this application.Within the spirit and principles of this application, made any to repair Change, equivalent replacement, improvement etc., should be included within the scope of protection of this application.

Claims (9)

1. the fiber-optic grating sensor that one kind can carry out self diagnosis, characterized in that the sensor is respectively arranged on the base with Emergency stop mechanism and resetting-mechanism for self diagnosis；

First fiber grating is connected to the groove on pedestal top by the first optical fiber collimator, and the second fiber grating passes through the second light Fine collimator is connected to the groove on pedestal top, and the emergency stop mechanism and resetting-mechanism are each attached on pedestal；

By emergency stop mechanism enable to the fiber-optic grating sensor for detect the first fiber grating and/or the first fiber grating Wavelength then self diagnosis determines the working condition of the fiber-optic grating sensor, which is made by resetting-mechanism Device is in not operating state.

2. the fiber-optic grating sensor that one kind as described in claim 1 can carry out self diagnosis, characterized in that the emergency stop mechanism Guide groove including the spring guide groove and scram button connecting rod that are provided in pedestal is arranged in the scram button connecting rod Scram button connecting rod, the scram button connecting rod are connected to scram button, and the scram button connection rod structure is ladder Shape cylindrical structure.

3. the fiber-optic grating sensor that one kind as claimed in claim 2 can carry out self diagnosis, characterized in that the scram button Connecting rod major diameter cylindrical inside is equipped with cylinder shape groove and is provided with light passing slot in major diameter cylinder periphery, and major diameter cylinder periphery is also symmetrical It is provided with the protrusion for carrying out locking to scram button connecting rod, which is equipped with o-ring groove； Scram button connecting rod is capped and pedestal wraps up and can be carried out sliding.

4. the fiber-optic grating sensor that one kind as claimed in claim 2 can carry out self diagnosis, characterized in that the spring guiding It is provided with the first spring in slot, is located at below upper cover, and in chassis interior, the lower part of the first spring is led in chassis interior spring To the lower contacts of slot, elastic force is sprung back for providing scram button and scram button connecting rod.

5. the fiber-optic grating sensor that one kind as claimed in claim 2 can carry out self diagnosis, characterized in that the two of the pedestal Side is symmetrically arranged with resetting-mechanism, and the resetting-mechanism includes reset button and the reset button connecting rod being attached thereto, described Reset button connecting rod is fixed on the side of pedestal by fixing seat.

6. the fiber-optic grating sensor that one kind as claimed in claim 5 can carry out self diagnosis, characterized in that reset button connection Bar and scram button connecting rod spatially vertical distribution.

7. the fiber-optic grating sensor that one kind as claimed in claim 6 can carry out self diagnosis, characterized in that the reset button Second spring is provided between connecting rod and fixing seat, second spring keeps reset button connecting rod to have and compresses scram button company The pressure of extension bar.

8. the fiber-optic grating sensor that one kind as described in claim 1 can carry out self diagnosis, characterized in that second optical fiber Grating one end is directly hanging or is encapsulated on enhanced sensitivity platform.

9. the fiber Bragg grating sensor system that one kind can carry out self diagnosis, characterized in that including several sensor groups, every group of sensing Device passes through splitter and is connected to fiber Bragg grating (FBG) demodulator, and the fiber Bragg grating (FBG) demodulator and PLC controller communicate；Every group of sensing Sensor is the fiber-optic grating sensor that can carry out self diagnosis in device；Sensor in every group of sensor is claim 1-8 Any described one kind can carry out the fiber-optic grating sensor of self diagnosis.