CN2539146Y - Optical fibre raster temp voltage sensor - Google Patents

Optical fibre raster temp voltage sensor Download PDF

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Publication number
CN2539146Y
CN2539146Y CN 02219856 CN02219856U CN2539146Y CN 2539146 Y CN2539146 Y CN 2539146Y CN 02219856 CN02219856 CN 02219856 CN 02219856 U CN02219856 U CN 02219856U CN 2539146 Y CN2539146 Y CN 2539146Y
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CN
China
Prior art keywords
sensing
temperature
voltage
fiber grating
piezoelectric ceramic
Prior art date
Application number
CN 02219856
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Chinese (zh)
Inventor
胡浩
Original Assignee
胡浩
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Application filed by 胡浩 filed Critical 胡浩
Priority to CN 02219856 priority Critical patent/CN2539146Y/en
Application granted granted Critical
Publication of CN2539146Y publication Critical patent/CN2539146Y/en

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Abstract

The utility model discloses a fibre barrier temperature and voltage sensor, belonging to the technical field of fiber barrier sensing device. The technical problem that the utility model needs to solve is to provide a temperature and voltage sensor of fibre barrier that can simultaneously measure the change of temperature and voltage. The utility model comprises a broadband light source (1), a spectrum analyzer (2), a coupler (3) and a sensing element (4). The sensing element is composed of a fibre barrier (4-1) and a piezoelectric ceramic piece (4-2). Partial fibre barrier (4-1) is attached to the piezoelectric ceramic piece (4-2), which makes the fibre barrier (4-1) has two reflection peaks. The two reflection peaks have different responses to the temperature, so that the utility model can simultaneously measure the change of temperature and voltage. The utility model is suitable for the power network, the relevant devices of the power network and kinds of electromechanical devices. The sensing element of the utility model can be combined with the transformer or composite materials of lathes by using the method of bury and attachment in order to produce a sensing system with sensitive material, structure and reflection.

Description

The optical fiber grating temperature voltage sensor

Technical field: the utility model belongs to a kind of fiber bragg grating sensing device.

Background technology: at present, appearance along with fiber grating, people also are devoted to be applied to the sensing of various physical quantitys when using it for optical communication, as temperature, strain, voltage, pressure, electric current, little vibration, ultrasound wave etc., therefore cause great research interest at sensory field.As the fiber bragg grating sensing device and the application in the 3S system thereof of information pickup, promptly superb Fiber Bragg Grating technology, optical fiber neural network, optical fiber are activated instrument and organically combines together, once cause the very big concern of scientific circles and become the research focus.The method that utilization is buried or attached is compound to them and makes modern carrier (as aircraft, the naval vessel, tank etc.) or various building body (as bridge, dam, in the compound substance of framework building etc.) and load spare exterior skin, make sensitive material, the intelligent sensing system of sensitive structure and sensitive reflection, make it as of multiple parameter such as the strain of human nerve network to measured body, temperature, stress, various physical quantitys such as fission are carried out the large tracts of land real time comprehensive and are measured, diagnosis and control, and by measuring and data handling system is carried out state analysis, simultaneously various out-of-limit behaviors are in time alarmed, taken emergency measures in case of necessity.

But, because the sensitive structure of present this sensing device is when the optical measurement that realizes non-optical amount, especially to the detection of two parameter signals, as temperature and voltage, because of fiber grating responsive simultaneously to temperature and voltage, so can't reflect the wavelength variations that temperature and voltage cause separately simultaneously by the mobile of detection fiber optical grating reflection wavelength, therefore, can't measure simultaneously temperature and voltage, this is a great problem that 3S series runs into.So someone adopts grating that optical fiber combination makes or fiber Bragg grating F-P chamber to realize that two parameter signals measure simultaneously, the sensing element that adopts the combination of a plurality of gratings to make brings also that the fiber grating demand is big, the demodulating system number is many, is unfavorable for shortcoming such as sensing head miniaturization.Also have the people to write grating in different optical fiber junctions, as two-parameter sensing element, but this fiber grating is easy to bad section, can not be applied in the actual detection field.

Summary of the invention: technical problem to be solved in the utility model is: a kind of variation, the dependable performance that can measure temperature and voltage simultaneously is provided, has actual application value, simple optical fiber grating temperature voltage sensor.Its technical scheme is: a kind of optical fiber grating temperature voltage sensor, comprise wideband light source, spectroanalysis instrument, coupling apparatus and sensing element, it is characterized in that: described sensing element is made of fiber grating and piezoelectric ceramic piece, overlays the fiber grating of some on the piezoelectric ceramic piece.Its technique effect is: because the part of fiber grating is overlayed on piezoelectric ceramic piece, so there is strain in the part fiber grating that overlays on piezoelectric ceramic piece, its grid cycle changes, and causes the reflection wavelength of this part fiber grating to change; And fiber grating does not overlay the another part on piezoelectric ceramic piece, its foveal reflex wavelength is then constant, therefore, whole fiber grating has two reflection peaks, these two reflection peaks have different temperature-responsives, and the part fiber grating that only overlays on piezoelectric ceramic piece has excellent linear response to voltage, and another part fiber grating that does not overlay on piezoelectric ceramic piece then has excellent linear response to temperature.Therefore, this sensor can be measured the variation of temperature and voltage simultaneously, and has excellent linear response for temperature and change in voltage, simultaneously, because fiber grating has that volume is little, in light weight, intensity is high and characteristics such as good bending property, it can make sensing element be easy to miniaturization with making sensing element by withstand voltage piezoelectric ceramic piece, be suitable under various environment monitor temperature in real time and on a large scale in the change in voltage situation, and simple in structure, making is easy.This sensor is applicable on power transmission network and relevant device and the various electromechanical equipment, its sensing element also can utilize the method for burying or attaching that it is compound in the compound substance of making transformer or various lathes, makes the sensor-based system of sensitive material, sensitive structure and sensitive reflection.

The drawing explanation:

Fig. 1 is the utility model structure connection diagram;

Fig. 2 is the sensing element structural representation.

Embodiment;

As shown in Figure 1, this sensor is made up of a 3db coupling apparatus 3, wideband light source 1, spectroanalysis instrument 2 and sensing element 4.Sensing element 4 (see figure 2)s are made of fiber grating 4-1 and piezoelectric ceramic piece 4-2, employing is given strain gauge technique half of a fiber grating 4-1 is overlayed on piezoelectric ceramic piece 4-2, discharge stress then, second half fiber grating deformation that does not overlay on piezoelectric ceramic piece 4-2 is recovered, this a part of fiber grating that deformation recovers, its foveal reflex ripple is constant, and overlay the part fiber grating on piezoelectric ceramic piece owing to there is strain, its grid cycle changes, cause the reflection wavelength of this part optical fiber to change, therefore whole fiber grating has two reflection peaks, these two reflection peaks have different temperature-responsives, and the part fiber grating that only overlays on electroceramics sheet 4-2 has excellent linear response to voltage.3db coupling apparatus 3 has four ports, its port 3-1 and sensing element 4 weldings, and port 3-2 is wound in the circle of straight warp less than 6mm, makes the reflected light loss of this port, port 3-3 and wideband light source 1 welding, port 3-4 is connected with spectroanalysis instrument 2.

Its course of work is as follows: the light that wideband light source 1 sends enters fiber grating 4-1 through 3db coupling apparatus 3, is passed through 3db coupling apparatus input spectrum analyser 2 again after the fiber grating reflection.When the temperature of sensing element 4 or the voltage surveyed change, will cause that two reflection peaks of fiber grating move, and reflect, thereby measure when realizing temperature and voltage by spectroanalysis instrument 2.

Claims (2)

1, a kind of optical fiber grating temperature voltage sensor, comprise wideband light source (1), spectroanalysis instrument (2), coupling apparatus (3) and sensing element (4), it is characterized in that: described sensing element (4) is made of fiber grating (4-1) and piezoelectric ceramic piece (4-2), overlays the fiber grating (4-1) of part on the piezoelectric ceramic piece (4-2).
2, as weighing 1 described a kind of sensor, it is characterized in that: the port (3-2) of described coupling apparatus (3) is wound in the circle of straight warp less than 6mm.
CN 02219856 2002-04-08 2002-04-08 Optical fibre raster temp voltage sensor CN2539146Y (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 02219856 CN2539146Y (en) 2002-04-08 2002-04-08 Optical fibre raster temp voltage sensor

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Application Number Priority Date Filing Date Title
CN 02219856 CN2539146Y (en) 2002-04-08 2002-04-08 Optical fibre raster temp voltage sensor

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101832794A (en) * 2010-03-30 2010-09-15 浙江大学 Fiber Bragg grating and fiber Raman composite sensing network and realizing method thereof
CN101949744A (en) * 2010-09-06 2011-01-19 国网电力科学研究院武汉南瑞有限责任公司 Fiber grating-based transformer internal temperature detection system
CN103323056A (en) * 2013-06-26 2013-09-25 国家电网公司 Direct current, temperature and pressure monitoring device for electrical equipment
CN103439561A (en) * 2013-08-26 2013-12-11 石家庄经济学院 High-sensitivity fiber grating voltage sensor

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101832794A (en) * 2010-03-30 2010-09-15 浙江大学 Fiber Bragg grating and fiber Raman composite sensing network and realizing method thereof
CN101949744A (en) * 2010-09-06 2011-01-19 国网电力科学研究院武汉南瑞有限责任公司 Fiber grating-based transformer internal temperature detection system
CN101949744B (en) * 2010-09-06 2012-08-08 国网电力科学研究院武汉南瑞有限责任公司 Fiber grating-based transformer internal temperature detection system
CN103323056A (en) * 2013-06-26 2013-09-25 国家电网公司 Direct current, temperature and pressure monitoring device for electrical equipment
CN103323056B (en) * 2013-06-26 2016-06-15 国家电网公司 A kind of power equipment DC current temperature, pressure monitoring device
CN103439561A (en) * 2013-08-26 2013-12-11 石家庄经济学院 High-sensitivity fiber grating voltage sensor
CN103439561B (en) * 2013-08-26 2015-11-18 石家庄经济学院 A kind of high-sensitive fiber grating voltage sensor

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Effective date of registration: 20080912

Address after: No. 529 Wangjiang West Road, Hefei, Zhengyang Hefei photoelectric science and Technology Co., Ltd., postcode: 230088, Anhui

Patentee after: Hefei Zhengyang Photoelectric Technology Co.,Ltd.

Address before: No. 669, West Changjiang Road, Hefei, Zhengyang Hefei photoelectric science and Technology Co., Ltd., postcode: 230088, Anhui

Patentee before: Hu Hao

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