CN109764975B - Clamping type optical fiber Bragg grating temperature sensor and using method thereof - Google Patents
Clamping type optical fiber Bragg grating temperature sensor and using method thereof Download PDFInfo
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- CN109764975B CN109764975B CN201910029738.3A CN201910029738A CN109764975B CN 109764975 B CN109764975 B CN 109764975B CN 201910029738 A CN201910029738 A CN 201910029738A CN 109764975 B CN109764975 B CN 109764975B
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Abstract
The invention relates to a clamping type optical fiber Bragg grating temperature sensor and a using method thereof, belonging to the technical field of photoelectron measurement. The device comprises an adjusting rotating rod, a screw rod, a fixing block, a bottom plate, a control block, clamping arms, a gasket, a polytetrafluoroethylene plate, an optical fiber Bragg grating and a lead-out optical fiber;the fixed block is fixed on the bottom plate, the upper ends of the clamping arms are connected with the bottom plate, the upper end of the screw rod is provided with an adjusting rotating rod, the lower end of the screw rod is connected with the control block, the screw rod penetrates through the fixed block, the control block is connected with the left clamping arm and the right clamping arm, a compression-resistant and high-temperature-resistant gasket is arranged on one side of each clamping arm, the other side of each clamping arm is a polytetrafluoroethylene plate, the optical fiber Bragg. According to the relation between the shift value of the central wavelength of the optical fiber Bragg grating and the temperature of the measured objectB＝KTThe temperature of the measured object is calculated by Delta T. The invention is suitable for measuring the temperature of a clamping object, has simple structure, convenient installation and disassembly and strong anti-interference capability.
Description
Technical Field
The invention relates to a clamping type optical fiber Bragg grating temperature sensor and a using method thereof, belonging to the technical field of photoelectron measurement.
Background
In recent years, optical fiber sensors have been widely used in the field of measurement technology due to their advantages of high accuracy, low cost, and high interference rejection. The temperature is a common measurement project, the conventional temperature measuring tool has mercury thermometers, thermocouples, infrared temperature sensors, optical fiber sensors and the like, and the optical fiber temperature sensors have obvious comprehensive advantages in the aspects of measuring range, accuracy, anti-interference capability, electrical insulation, corrosion resistance and the like, particularly when the optical fiber temperature sensors are used in measuring environments such as strong electromagnetism, flammability, explosiveness and the like, the optical fiber Bragg grating temperature sensors are made of optical fiber materials, optical signals are used in signal transmission and sensing, on-site electroless measurement is realized, and an intrinsically safe online temperature measuring mode is provided. The optical fiber Bragg grating temperature sensor is often used for measuring temperature by adopting mounting methods such as embedded type, sticking type, screw fixation, manual fixation and the like, and the methods have low practicability for measured objects such as wall-shaped, tubular, convex, small-volume, temporary measurement and the like.
Disclosure of Invention
The invention aims to provide a clamping type optical fiber Bragg grating temperature sensor capable of being clamped on a measured object and a using method thereof, and provides a more convenient and faster temperature measuring method for temperature measurement of the measured object or environment with wall shape, tubular shape, convex shape, small volume and the like.
The technical scheme adopted by the invention is as follows: a clamping type optical fiber Bragg grating temperature sensor comprises an adjusting rotating rod 1, a screw rod 2, a fixing block 3, a bottom plate 4, a control block 5, a clamping arm 6, a gasket 7, a polytetrafluoroethylene plate 8, an optical fiber Bragg grating 9 and a lead-out optical fiber 10; wherein the fixed block 3 is fixed on the bottom plate 4, the upper end of the clamping arm 6 is connected with the bottom plate 4, the upper end of the screw rod 2 is connected with the adjusting rotating rod 1, the lower end of the screw rod passes through the fixed block 3 and the bottom plate 4 from top to bottom and then is connected with the top end of the control block 5, the two ends of the control block 5 are provided with oblique upward bosses, the middle part of the clamping arm 6 is provided with an insertion hole, the two bosses of the control block 5 can be inserted, and one side of the clamping arm 6 is provided with a boss, one inner side surface of the bottom plate 4 is provided with a groove, the boss of the clamping arm 6 can be slidably arranged in the groove of the bottom plate 4, the left clamping arm 6 and the right clamping arm 6 slide up and down along the bottom plate 4 while moving up and down along with the control block 5, a pressure-resistant and high-temperature-resistant gasket 7 is arranged on the inner side surface of the lower end of the left clamping arm 6, a polytetrafluoroethylene plate 8 is arranged on the inner side surface of the lower end of the right clamping arm 6, the optical fiber Bragg grating 9 is packaged in the polytetrafluoroethylene plate 8, and a lead-out optical fiber 10 is led out of the optical fiber Bragg grating 9 along the upper side.
Specifically, the inner side surface of the bottom plate 4 is in an inverted W shape, when the control block 5 is located at the topmost end, the two bosses of the control block 5 are inserted into the deepest positions of the insertion holes of the left clamping arm 6 and the right clamping arm 6, the upper ends of the left clamping arm 6 and the right clamping arm 6 are respectively in close contact with the bending part of the inner side wall of the bottom plate 4, the control block 5 moves upwards, the left clamping arm 6 and the right clamping arm 6 are folded upwards, the control block 5 moves downwards, and the left clamping arm.
Furthermore, threaded holes matched with the screw rods 2 are formed in the middle of the fixing block 3 and the bottom plate 4.
A use method of the clamping type optical fiber Bragg grating temperature sensor comprises the following specific steps:
step1, rotating the adjusting rotating rod 1, adjusting the distance between the clamping arms 6 by moving the control block 5 up and down to enable the object to be measured to be positioned inside the clamping arms 6, and rotating the adjusting rotating rod 1 to enable the clamping arms 6 to clamp the object to be measured;
step2, accessing the lead-out optical fiber 10 into a fiber bragg grating demodulator through a jumper wire for monitoring;
step3, the shift value Δ λ according to the central wavelength of the fiber Bragg grating 9BTemperature dependence of the measured objectB＝KTCalculating the temperature change of the measured object by delta T; in the formula: kTThe temperature coefficient of the sensor is used, and the delta T is the temperature variation of the measured object;
and Step4, after the measurement is finished, disconnecting the jumper wire, rotating the adjusting rotating rod 1 to open the clamping arm 6, and taking down the sensor.
The invention has the beneficial effects that:
1. the sensor adopts a clamping structure, and has measurement advantages for measured objects or environments with wall shapes, tubular shapes, convex shapes, small volumes and the like.
2. The optical fiber Bragg grating adopted by the sensor has strong corrosion resistance and electromagnetic interference resistance (EMI).
3. The sensor does not carry any electric signal, and can be suitable for temperature measurement in high-risk environments such as strong electromagnetism, inflammability, explosiveness and the like.
4. Simple structure, convenient installation and dismantlement.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of an expanded configuration of the present invention;
fig. 3 is a sectional view a-a in fig. 2.
The reference numbers in the figures: the device comprises a rotating rod 1, a screw rod 2, a fixed block 3, a bottom plate 4, a control block 5, a clamping arm 6, a gasket 7, a polytetrafluoroethylene plate 8, a fiber Bragg grating 9 and a lead-out fiber 10.
Detailed Description
The invention is further described with reference to the following figures and specific examples.
Example 1: as shown in fig. 1-3, a clamping type fiber Bragg grating temperature sensor includes an adjusting rotating rod 1, a screw 2, a fixed block 3, a bottom plate 4, a control block 5, a clamping arm 6, a gasket 7, a polytetrafluoroethylene plate 8, a fiber Bragg grating 9, and a lead-out fiber 10; wherein the fixed block 3 is fixed on the bottom plate 4, the upper end of the clamping arm 6 is connected with the bottom plate 4, the upper end of the screw rod 2 is connected with the adjusting rotating rod 1, the lower end of the screw rod passes through the fixed block 3 and the bottom plate 4 from top to bottom and then is connected with the top end of the control block 5, the two ends of the control block 5 are provided with oblique upward bosses, the middle part of the clamping arm 6 is provided with an insertion hole, the two bosses of the control block 5 can be inserted, and one side of the clamping arm 6 is provided with a boss, one inner side surface of the bottom plate 4 is provided with a groove, the boss of the clamping arm 6 can be slidably arranged in the groove of the bottom plate 4, the left clamping arm 6 and the right clamping arm 6 slide up and down along the bottom plate 4 while moving up and down along with the control block 5, a pressure-resistant and high-temperature-resistant gasket 7 is arranged on the inner side surface of the lower end of the left clamping arm 6, a polytetrafluoroethylene plate 8 is arranged on the inner side surface of the lower end of the right clamping arm 6, the optical fiber Bragg grating 9 is packaged in the polytetrafluoroethylene plate 8, and a lead-out optical fiber 10 is led out of the optical fiber Bragg grating 9 along the upper side.
Further, the inboard of bottom plate 4 is personally submitted the shape of falling W, and when control block 5 was located the top, two bosss of control block 5 inserted the deepest of two arm lock 6 jacks about, about the upper end of arm lock 6 respectively with the portion in close contact with of bending of the inside wall of bottom plate 4, control block 5 moved up, about two arm lock 6 will upwards draw in, control block 5 moves down, about two arm lock 6 will expand downwards, from this about realizing the installation two arm lock 6 press from both sides tight testees, about when dismantling two arm lock 6 open with the testees separation.
Furthermore, threaded holes matched with the screw rods 2 are formed in the middle of the fixing block 3 and the bottom plate 4.
A use method of the clamping type optical fiber Bragg grating temperature sensor comprises the following specific steps:
step1, rotating the adjusting rotating rod 1, adjusting the distance between the clamping arms 6 by moving the control block 5 up and down to enable the object to be measured to be positioned inside the clamping arms 6, and rotating the adjusting rotating rod 1 to enable the clamping arms 6 to clamp the object to be measured;
step2, accessing the lead-out optical fiber 10 into a fiber bragg grating demodulator through a jumper wire for monitoring;
step3, the shift value Δ λ according to the central wavelength of the fiber Bragg grating 9BTemperature dependence of the measured objectB＝KTCalculating the temperature change of the measured object by delta T; in the formula: kTThe temperature coefficient of the sensor is used, and the delta T is the temperature variation of the measured object;
and Step4, after the measurement is finished, disconnecting the jumper wire, rotating the adjusting rotating rod 1 to open the clamping arm 6, and taking down the sensor.
The working principle of the invention is as follows:
referring to fig. 1, since the fiber Bragg grating is encapsulated in a hollow teflon plate, the fiber Bragg grating is sensitive only to temperature and is insensitive to applied stress strain. Thus, the center wavelength λ of the fiber Bragg gratingBThe displacement is only related to temperature changes.
The fiber grating sensing characteristics are as follows:
λB＝2neffΛ (1)
bragg wavelength of optical fiber Bragg grating with effective refractive index neffAnd the grating period a, so that the Bragg wavelength is extremely sensitive to external stress strains, thermal loads, etc.
The change delta lambda of the period of the fiber Bragg grating caused by the thermal expansion effect when no external stress is applied and only the temperature is changed delta TBComprises the following steps:
ΔλB＝α·λB·ΔT (2)
wherein α is a thermal expansion coefficient of the optical fiber material.
Change of effective refractive index Δ n caused by thermo-optic effecteffComprises the following steps:
Δneff＝ξ·neff·ΔT (3)
where ξ is the thermo-optic coefficient of the fiber and represents the rate of change of the refractive index with temperature.
The change Delta lambda of the period of the fiber Bragg grating caused by the thermo-optic effect is obtained by the formula (1)BComprises the following steps:
where ξ is the thermo-optic coefficient of the optical fiber and represents the rate of change of the refractive index with temperature
According to the formula (2) and the formula (4), under the action of eliminating the external stress strain, the relation between the Bragg wavelength of the optical fiber Bragg grating temperature sensor and the temperature change is as follows:
for fused silica fibers, α is typically 0.55 × 10-6/℃，ξ＝6.67×10-6/℃。
ΔλB＝(α+ξ)·λB·ΔT＝KT·ΔT (6)
In the formula, KTThe temperature coefficient of the fiber Bragg grating is the actual value of the temperature coefficient based on temperature calibration.
The above formula shows that the Bragg wavelength shift of the fiber grating is in a linear relationship with the temperature change after the external stress strain action is eliminated. Thereby enabling the measurement of the temperature.
The concrete parameters are as follows:
1. the technical parameters of the fiber Bragg grating 9 are: center wavelength λB＝1550nm；
2. Configuring the experiment according to the attached figure 2;
3. obtaining the shift value Delta lambda of the central wavelength of the fiber Bragg grating 9 by a fiber grating demodulatorB；
4. The shift value DeltaLambda according to the center wavelength of the fiber Bragg grating 9BTemperature dependence of the measured objectB＝KTCalculating the temperature change of the measured object by delta T; in the formula: kTThe temperature coefficient of the sensor is delta T, and the delta T is the temperature change of the measured environment.
5. Theoretical calculation results show that when the initial Bragg wavelength of the optical fiber Bragg grating is 1550nm, the sensitivity of the clamping type optical fiber Bragg grating temperature sensor system is KT＝10.74pm/℃；
6. When the wavelength resolution of the fiber Bragg grating demodulator is 1pm (referred to as Δ λ)BPer 1pm change), the temperature resolution of the sensor is: 0.093 ℃, temperature measurement range: -20 ℃ to 120 ℃.
The sensor has simple structure, convenient installation and disassembly, low cost and small volume, and is suitable for temperature measurement of wall-shaped, tubular, convex, small-volume and other objects or environments which can be clamped, and the temperature measurement range is-20 ℃ to 120 ℃.
While the present invention has been described in detail with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.
Claims (4)
1. The utility model provides a centre gripping formula optic fibre Bragg grating temperature sensor which characterized in that: the device comprises an adjusting rotating rod (1), a screw (2), a fixing block (3), a bottom plate (4), a control block (5), a clamping arm (6), a gasket (7), a polytetrafluoroethylene plate (8), an optical fiber Bragg grating (9) and a lead-out optical fiber (10); wherein the fixed block (3) is fixed on the bottom plate (4), the upper end of the clamping arm (6) is connected with the bottom plate (4), the upper end of the screw rod (2) is connected with the adjusting rotating rod (1), the lower end of the screw rod penetrates through the fixed block (3) from top to bottom and then is connected with the top end of the control block (5), the two ends of the control block (5) are provided with oblique upward bosses, the middle part of the clamping arm (6) is provided with a jack, the two bosses of the control block (5) can be inserted into the jacks of the left clamping arm and the right clamping arm (6) in a sliding way, one side of the clamping arm (6) is provided with a boss, one inner side surface of the bottom plate (4) is provided with a groove, the boss of the clamping arm (6) can be arranged in the groove of the bottom plate (4) in a sliding way, the left clamping arm and the, the polytetrafluoroethylene plate (8) is arranged on the inner side face of the lower end of the right clamping arm (6), the optical fiber Bragg grating (9) is packaged in the polytetrafluoroethylene plate (8), and the optical fiber (10) is led out from the optical fiber Bragg grating (9) along the upper side.
2. The clamped fiber Bragg grating temperature sensor of claim 1, wherein: the inboard of bottom plate (4) is personally submitted the shape of falling W, and when control block (5) were located the top, two bosss of control block (5) inserted the deepest of controlling two arm lock (6) jacks, controlled the upper end of arm lock (6) respectively with the portion in close contact with of bending of the inside wall of bottom plate (4), control block (5) rebound, about two arm lock (6) will upwards draw in, control block (5) lapse, about two arm lock (6) will expand downwards.
3. The clamped fiber Bragg grating temperature sensor of claim 1, wherein: and threaded holes matched with the screw rods (2) are formed in the middle parts of the fixing block (3) and the bottom plate (4).
4. A method of using the clamped fiber Bragg grating temperature sensor of any one of claims 1 to 3, wherein: the method comprises the following specific steps:
step1, rotating the adjusting rotating rod (1), adjusting the distance between the clamping arms (6) by moving the control block (5) up and down to enable the object to be measured to be positioned at the inner sides of the clamping arms (6), and rotating the adjusting rotating rod (1) to enable the clamping arms (6) to clamp the object to be measured;
step2, accessing the lead-out optical fiber (10) into a fiber bragg grating demodulator through a jumper wire for monitoring;
step3, shift value Delta lambda according to the central wavelength of the fiber Bragg grating (9)BTemperature dependence of the measured objectB＝KTCalculating the temperature change of the measured object by delta T; in the formula: kTThe temperature coefficient of the sensor is used, and the delta T is the temperature variation of the measured object;
and Step4, after the measurement is finished, disconnecting the jumper wire, rotating the adjusting rotating rod (1) to open the clamping arm (6), and taking down the sensor.
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| CS195385B1 (en) * | 1974-06-18 | 1980-01-31 | Milos Vecera | Device for supplying fibre strands such as slivers to fibre separating mechanisms |
| US10006944B2 (en) * | 2012-07-19 | 2018-06-26 | Gridview Optical Solutions, Llc. | Electro-optic current sensor with high dynamic range and accuracy |
| CN203811295U (en) * | 2014-05-21 | 2014-09-03 | 三峡大学 | Optical fiber temperature alarm threshold value actuator based on shape memory alloy |
| CN206724980U (en) * | 2016-11-23 | 2017-12-08 | 国家电网公司 | The adjustable clamping of boiler pipe detection sensor and multi-faceted regulation fixing apparatus |
| CN106940463B (en) * | 2017-05-16 | 2018-07-24 | 苏州专创光电科技有限公司 | A kind of optical fiber connector rotating and clamping device |
| CN209828236U (en) * | 2019-04-17 | 2019-12-24 | 广东高乐股份有限公司 | Stay cord formula clamping jaw |
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