CN101943614A - Device and method for improving sensitivity of optical fiber grating temperature sensor - Google Patents

Device and method for improving sensitivity of optical fiber grating temperature sensor Download PDF

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Publication number
CN101943614A
CN101943614A CN 201010266897 CN201010266897A CN101943614A CN 101943614 A CN101943614 A CN 101943614A CN 201010266897 CN201010266897 CN 201010266897 CN 201010266897 A CN201010266897 A CN 201010266897A CN 101943614 A CN101943614 A CN 101943614A
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CN
China
Prior art keywords
substrate
fiber
temperature sensor
optical grating
grating temperature
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Pending
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CN 201010266897
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Chinese (zh)
Inventor
谢志杨
金向朝
李林发
区伟潮
黄松波
彭云峰
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Foshan Power Supply Bureau of Guangdong Power Grid Corp
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Foshan Power Supply Bureau of Guangdong Power Grid Corp
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Priority to CN 201010266897 priority Critical patent/CN101943614A/en
Publication of CN101943614A publication Critical patent/CN101943614A/en
Pending legal-status Critical Current

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Abstract

The invention discloses a method and a device for improving the sensitivity of an optical fiber grating temperature sensor, which relates to a method for sensitizing an optical fiber grating temperature sensor structure. In the invention, a laser source is connected with an optical coupling system, a modulation/demodulation system and an optical fiber grating temperature sensor through optical fibers so as to realize temperature measurement, wherein the optical fiber grating temperature sensor is in close contact with a measured object. The optical fiber grating is fixed on a sensitizing substrate so as to sensitize the optical fiber grating by using the special structure and relatively high thermal expansion coefficient of the sensitizing substrate. The invention improves the temperature sensitivity of the optical fiber grating temperature sensor while maintaining high linearity and precision, which is applicable to the occasions with non-obvious temperature change of the measured object but relatively high requirements on the temperature measurement precision and sensitivity, and has broad application prospect.

Description

Improve the device and method of fiber-optical grating temperature sensor sensitivity
[technical field]
The present invention relates to a kind of temperature sensor, relate in particular to a kind of fiber-optical grating temperature sensor of structure enhanced sensitivity.
[background technology]
At present, well-known thermometric mode has temperature indicating wax disk(-sc), infrared measurement of temperature, thermal resistance, thermopair, optical fiber temperature-measurement and optical fiber grating temperature-measuring.The temperature indicating wax disk(-sc) can be judged the contact position the degree of heat roughly, yet this method accuracy is low, and reliability is also poor, can not be used as quantitative measurment; Temperature element does not need to contact with measured medium during infrared measurement of temperature, temperature-measuring range is wide, be not subjected to the restriction of the thermometric upper limit, also can not destroy the temperature field of testee, reaction velocity is generally also than comparatively fast, but be subjected to the influence of the extraneous factors such as emissivity, measuring distance, flue dust and aqueous vapor of object, its measuring error is bigger; Thermal resistance, thermopair price are higher, can not satisfy the needs that Distributed Multi is measured, and need the plain conductor transmission signals, and for the environment of strong electromagnetic radiation, measuring stability is relatively poor; Optical fiber temperature-measurement does not produce electromagnetic interference (EMI), is not subjected to electromagnetic interference (EMI) yet, and volume is little, and radioresistance and corrosion resistance are good, can carry out distributed measurement, but the optical fiber temperature-measurement precision is lower; Fiber grating can be realized quasi-distributed measurement, temperature measurement accuracy is than the optical fiber height, but for temperature control and the higher occasion of accuracy requirement, must carry out the enhanced sensitivity encapsulation to grating, present photosensitivity-enhancing method mainly comprises employing metal enhanced sensitivity and polymkeric substance enhanced sensitivity, and the Metal Packaging structure is single and sensitivity is lower, and polymer encapsulated is highly sensitive, but hesitation is bigger, poor stability.
Therefore, provide the device and method of a kind of highly sensitive, good stability, hesitation is little, temperature measurement accuracy is high raising fiber-optical grating temperature sensor sensitivity real for necessary.
[summary of the invention]
The object of the invention is: low in order to overcome most existing temperature sensor precision, sensitivity is not high, sluggishness is excessive and the shortcoming of poor repeatability, the invention provides a kind of device and method that improves fiber-optical grating temperature sensor sensitivity, the present invention not only can realize quasi-distributed measurement, be not subjected to electromagnetic interference (EMI), and temperature measurement accuracy and sensitivity is higher, hesitation is little, stability is high.
A kind of device that improves fiber-optical grating temperature sensor sensitivity of the present invention, this fiber-optical grating temperature sensor is and wideband light source, optical coupling system and modulation demodulation system connect by optical fiber, fiber-optical grating temperature sensor closely contacts with measurand, fiber-optical grating temperature sensor is made up of substrate and fiber grating, the substrate of fiber-optical grating temperature sensor is made up of first substrate and second substrate of different heat expansion coefficient, one end of first substrate and second substrate is fixed, fiber grating is fixed in the substrate, improves fiber-optical grating temperature sensor sensitivity by this structure.
The bigger material of thermal expansivity is adopted in this first substrate, the relative materials with smaller of thermal expansivity is adopted in this second substrate, for example: first substrate is the bigger aluminium matter substrate of thermal expansivity, and this second substrate is the less relatively tempered glass substrate of thermal expansivity.First substrate and second substrate can also be adopted other the relative discrepant suitable base material of thermal expansivity., as: the aluminium of titanium steel, low thermal expansion etc.
Preferable, described first substrate is " L " shape, have bossing, described second substrate is a rectangular parallelepiped, second substrate places the surface of first substrate, and the bossing upper surface of first substrate is identical with the second upper surface of substrate height, is in same level height to guarantee the fiber grating two ends, one end of first substrate and second substrate is fixed together, and leaves the slit between the other end.As preferred version, leave the 1mm slit between the other end of described first substrate and second substrate.This slit is to leave the space that relatively moves between first substrate and second substrate for.
This fiber grating is fixed on the top of substrate, the parallel axes of the direction and first substrate and second substrate, and an end is fixed on the low order end of first substrate, and the other end is fixed in second substrate.When the temperature of measurand rose, the elongation of first substrate was greater than the elongation of second substrate, and the difference between two elongations acts on the effect that reaches enhanced sensitivity on the length of fiber grating.Under the contrast, when the homogenous material identical with first substrate adopted in substrate, the elongation of substrate acted on the fiber grating with the substrate equal length.The identical variable quantity of substrate acts on the fiber grating of different length, and obviously, the effect of enhanced sensitivity of preceding a kind of structural design is obvious.
The left justify of described first substrate and second substrate is also used fixed screw application of adhesive secure fixation.Fixed screw can adopt the microgroove screw, behind the application of adhesive, is vertically fixed on the high order end of substrate.
Preferably, this first substrate is provided with inverted trapezoidal groove, this second substrate lower surface is provided with the trapezoidal projection that the shape size cooperates with it, this first substrate and second substrate are by this textural association together, only vertically to relatively move, prevent from laterally to reach between first substrate and second substrate relatively moving of vertical direction each other.The structure that matches that other shapes can also be set between first substrate and second substrate realize the relatively moving qualification of direction.
The present invention also provides a kind of raising fiber-optical grating temperature sensor sensitivity of method, this fiber-optical grating temperature sensor is to be connected by optical fiber with wideband light source, optical coupling system and modulation demodulation system, and fiber-optical grating temperature sensor closely contacts with measurand.
The measurand variation of temperature causes the variation of fiber grating centre wavelength, light wave after centre wavelength changes enters modulation demodulation system by optical coupling system and handles, the magnitude of voltage that different wavelength variable quantity is corresponding different, draw the temperature of measurand by sampling to voltage signal, the measurand variation of temperature causes the change of fiber-optical grating temperature sensor base material stroke, as mentioned above, the substrate of this fiber-optical grating temperature sensor is made up of the material of two kinds of different heat expansion coefficients, by this structure the variation of fiber-optical grating temperature sensor substrate stroke farthest is applied to the two ends of fiber grating, thereby has improved fiber-optical grating temperature sensor sensitivity.
The beneficial effect that the present invention is compared with the prior art is:
The device and method of raising fiber-optical grating temperature sensor provided by the present invention sensitivity, it is low to have overcome most existing temperature sensor precision, sensitivity is not high, sluggishness is excessive and the shortcoming of poor repeatability, makes this sensor not only can realize quasi-distributed measurement, is not subjected to electromagnetic interference (EMI); And temperature measurement accuracy and sensitivity is higher, the linearity is good, hesitation is little, stability is high; Also have base material to obtain conveniently in addition, the processing of substrate is simple relatively, and the sensor construction exquisiteness is small and exquisite, good looking appearance.
Description of drawings
Fig. 1 is temperature-measurement principle figure of the present invention;
Fig. 2 is the underlying structure synoptic diagram of fiber-optical grating temperature sensor;
Fig. 3 is the structural representation of fiber-optical grating temperature sensor;
Fig. 4 is the vertical view of fiber-optical grating temperature sensor;
Fig. 5 is the side view of fiber-optical grating temperature sensor.
Embodiment
In Fig. 1, wideband light source 10 is connected with optical coupling system 30, modulation demodulation system 40 and fiber-optical grating temperature sensor 50 by optical fiber 20 realizes temperature survey.
In Fig. 2, the substrate 2 of fiber-optical grating temperature sensor is made of thermal expansivity big first substrate 21 and the second little substrate 22 of thermal expansivity, first substrate 21 is the bigger aluminium matter substrates of thermal expansivity, and this second substrate 22 is the less relatively tempered glass substrate of thermal expansivity.As preferred embodiment, described first substrate 21 is " L " shape, has bossing 23, described second substrate 22 is a rectangular parallelepiped, the upper surface of the bossing 23 of first substrate is identical with second substrate, 22 upper level, to guarantee that the fiber grating two ends are in same level height, first substrate 21 and second substrate 22 all require to have lower hesitation and good repeatability.
Please in conjunction with consulting Fig. 3~5, preferably, this first substrate 21 is provided with inverted trapezoidal groove, these second substrate, 22 lower surfaces be provided with that the shape size cooperates with it trapezoidal protruding 24, second substrate 22 is embedded in first substrate 21 by this structure, each other only with vertical (the i.e. axis direction of first substrate 21 and second substrate 22, left and right directions among Fig. 3) relatively moves, prevent between first substrate 21 and second substrate 22 laterally relatively moving of (direction of vertical paper among Fig. 3) and vertical direction (above-below direction of paper among Fig. 3).
Fiber-optical grating temperature sensor 50 is made of fixed screw 1, substrate 2 and fiber grating 3.Fixed screw 1 is positioned at the high order end of substrate 2 and perpendicular to substrate 2 first substrate 21 and second substrate 22 is fixed together, and the left end of this determining positions first substrate 21 and second substrate 22 does not have relative displacement, and its height is identical with the height of substrate 2; Second substrate 22 is embedded in the substrate 21 by dovetail groove, thereby relative displacement changes and only occurs in horizontal direction when guaranteeing temperature variation, the two left justify, and right-hand member is used for staying extendable room between the two at a distance of 1mm; The two ends of fiber grating 3 are separately fixed at the low order end of first substrate 21 and second substrate 22 by strong adhesive.
The present invention improves the fiber-optical grating temperature sensor sensitivity of method: the measurand variation of temperature causes the variation of fiber grating centre wavelength, light wave after centre wavelength changes enters modulation demodulation system by optical coupling system and handles, the magnitude of voltage that different wavelength variable quantity is corresponding different, draw the temperature of measurand by sampling to voltage signal, the measurand variation of temperature causes the change of fiber-optical grating temperature sensor base material stroke, when the temperature of measurand rises, the elongation Δ L of first substrate 21 1Elongation Δ L greater than second substrate 22 2, the difference DELTA L between two elongations 12Act on the length L of fiber grating 3 3On reach the effect of enhanced sensitivity.The variation of fiber-optical grating temperature sensor substrate 2 strokes farthest is applied to the two ends of fiber grating 3, thereby has improved fiber-optical grating temperature sensor sensitivity.
Under the contrast, when the homogenous material identical with first substrate 21 adopted in substrate, the elongation Δ L of substrate 1Act on the fiber grating with the substrate equal length strain Δ L of fiber grating under two kinds of situations 12/ L 3Greater than Δ L 1/ L 1So the former effect of enhanced sensitivity is obvious.
The above is preferred embodiment of the present invention only, and protection scope of the present invention is not limited thereto, and anyly all belongs within the protection domain of the present invention based on the equivalent transformation on the technical solution of the present invention.

Claims (9)

1. device that improves fiber-optical grating temperature sensor sensitivity, this fiber-optical grating temperature sensor is and wideband light source (10), optical coupling system (30) and modulation demodulation system (40) connect by optical fiber (20), fiber-optical grating temperature sensor (50) closely contacts with measurand, it is characterized in that: fiber-optical grating temperature sensor (50) is made up of substrate (2) and fiber grating (3), this substrate (2) is made up of first substrate (21) and second substrate (22) of different heat expansion coefficient, one end of first substrate (21) and second substrate (22) is fixed, fiber grating (3) is fixed in the substrate (2), improves fiber-optical grating temperature sensor sensitivity by this structure.
2. the device of raising fiber-optical grating temperature sensor according to claim 1 sensitivity, it is characterized in that: this substrate (2) comprises first substrate (21) and less relatively second substrate (22) of thermal expansivity that thermal expansivity is bigger, described first substrate (21) is " L " shape, have bossing, described second substrate (22) is a rectangular parallelepiped, second substrate (22) places the surface of first substrate (21), the bossing upper surface of first substrate (21) is identical with second substrate (22) upper level, one end of first substrate (21) and second substrate (22) is fixed together, and leaves the slit between the other end.
3. the fiber-optical grating temperature sensor of structure enhanced sensitivity according to claim 2, it is characterized in that: this fiber grating (3) is fixed on the top of substrate (2), the parallel axes of direction and first substrate (21) and second substrate (22), one end is fixed on the low order end of first substrate (21), and the other end is fixed in second substrate (22).
4. the fiber-optical grating temperature sensor of structure enhanced sensitivity according to claim 3 is characterized in that: the left justify of described first substrate (21) and second substrate (22) is also fixing with fixed screw (1).
5. the fiber-optical grating temperature sensor of structure enhanced sensitivity according to claim 4 is characterized in that: this fixed screw (1) adopts the microgroove screw, behind the application of adhesive, is vertically fixed on the high order end of substrate (2).
6. the fiber-optical grating temperature sensor of structure enhanced sensitivity according to claim 2 is characterized in that: leave the 1mm slit between the other end of described first substrate (21) and second substrate (22).
7. the fiber-optical grating temperature sensor of structure enhanced sensitivity according to claim 1 and 2, it is characterized in that: the bigger aluminium matter substrate of thermal expansivity is adopted in this first substrate (21), and this second substrate (22) is the less relatively tempered glass substrate of thermal expansivity.
8. the fiber-optical grating temperature sensor of structure enhanced sensitivity according to claim 1 and 2, it is characterized in that: this first substrate (21) is provided with inverted trapezoidal groove, this second substrate (22) lower surface is provided with the trapezoidal projection that the shape size cooperates with it, this first substrate (21) is passed through this textural association together with second substrate (22), each other only vertically to relatively move.
9. one kind is improved the fiber-optical grating temperature sensor sensitivity of method, it is characterized in that: this fiber-optical grating temperature sensor is to be connected by optical fiber (20) with wideband light source (10), optical coupling system (30) and modulation demodulation system (40), fiber-optical grating temperature sensor (50) closely contacts with measurand, it is characterized in that:
This fiber-optical grating temperature sensor (50) adopts as each described structure in the claim 1~8, the measurand variation of temperature causes the variation of fiber grating centre wavelength, light wave after centre wavelength changes enters modulation demodulation system by optical coupling system and handles, the magnitude of voltage that different wavelength variable quantity is corresponding different, draw the temperature of measurand by sampling to voltage signal, the measurand variation of temperature causes the change of fiber-optical grating temperature sensor substrate (2) material stroke, substrate is made up of the material of two kinds of different heat expansion coefficients, by the variation of fiber-optical grating temperature sensor substrate (2) stroke farthest being applied to the two ends of fiber grating (3), thereby improved fiber-optical grating temperature sensor sensitivity as each described structure in the claim 1~8.
CN 201010266897 2010-08-27 2010-08-27 Device and method for improving sensitivity of optical fiber grating temperature sensor Pending CN101943614A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102169028A (en) * 2011-01-20 2011-08-31 中国电力科学研究院 System for measuring temperature in thyristor in real time
CN102699843A (en) * 2012-04-19 2012-10-03 西安飞机工业(集团)有限责任公司 Aircraft assembly fixture made of materials with different expansion coefficients
CN102798484A (en) * 2012-08-14 2012-11-28 广东电网公司佛山供电局 Low-hysteresis fiber bragg grating temperature sensor

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2572422Y (en) * 2002-10-11 2003-09-10 东南大学 Optical fibre raster single end temp compensation package device
CN2679702Y (en) * 2003-12-18 2005-02-16 南开大学 Optical fiber raster temp sensing booster having double shoulder beams
CN101046412A (en) * 2007-03-16 2007-10-03 东华大学 High temperature fiber grating sensing system
CN101298999A (en) * 2008-05-05 2008-11-05 中国地震局地壳应力研究所 Method for making high-sensitivity optical fiber grating temperature sensor working in high and low temperature
CN201819752U (en) * 2010-08-27 2011-05-04 广东电网公司佛山供电局 Structure-sensitized fiber grating temperature sensor

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2572422Y (en) * 2002-10-11 2003-09-10 东南大学 Optical fibre raster single end temp compensation package device
CN2679702Y (en) * 2003-12-18 2005-02-16 南开大学 Optical fiber raster temp sensing booster having double shoulder beams
CN101046412A (en) * 2007-03-16 2007-10-03 东华大学 High temperature fiber grating sensing system
CN101298999A (en) * 2008-05-05 2008-11-05 中国地震局地壳应力研究所 Method for making high-sensitivity optical fiber grating temperature sensor working in high and low temperature
CN201819752U (en) * 2010-08-27 2011-05-04 广东电网公司佛山供电局 Structure-sensitized fiber grating temperature sensor

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102169028A (en) * 2011-01-20 2011-08-31 中国电力科学研究院 System for measuring temperature in thyristor in real time
CN102169028B (en) * 2011-01-20 2014-09-10 中国电力科学研究院 System for measuring temperature in thyristor in real time
CN102699843A (en) * 2012-04-19 2012-10-03 西安飞机工业(集团)有限责任公司 Aircraft assembly fixture made of materials with different expansion coefficients
CN102798484A (en) * 2012-08-14 2012-11-28 广东电网公司佛山供电局 Low-hysteresis fiber bragg grating temperature sensor
CN102798484B (en) * 2012-08-14 2014-06-25 广东电网公司佛山供电局 Low-hysteresis fiber bragg grating temperature sensor

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