CN101900576B - Method for manufacturing fiber bragg grating Fabry-Perot sensor - Google Patents

Method for manufacturing fiber bragg grating Fabry-Perot sensor Download PDF

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CN101900576B
CN101900576B CN2010102211761A CN201010221176A CN101900576B CN 101900576 B CN101900576 B CN 101900576B CN 2010102211761 A CN2010102211761 A CN 2010102211761A CN 201010221176 A CN201010221176 A CN 201010221176A CN 101900576 B CN101900576 B CN 101900576B
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optical fiber
fiber
section
fabry
spectrometer
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CN101900576A (en
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周倩
宁提纲
李晶
胡旭东
张振宇
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Beijing Jiaotong University
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Abstract

The invention relates to a method for manufacturing a fiber bragg grating Fabry-Perot sensor. The method comprises the following steps of: connecting a broadband light source and a first port of a circulator, connecting a second port of the circulator and one end of an optical fiber, and connecting a third port of the circulator and a spectrometer; stripping one section of a coating layer of the optical fiber, attaching the section of optical fiber to a phase mask plate tightly, and arranging and fixing the section of optical fiber on a mobile platform; switching the broadband light source, the spectrometer, a laser and a computer on; controlling the laser and a servo motor by using the computer; converging ultraviolet laser light into linear light spots through a cylindrical lens; irradiating the light spots onto the phase mask plate and the optical fiber after the light spots permeate through slits; controlling the mobile platform to move by using the servo motor; manufacturing a section of fiber bragg grating on the optical fiber; heating the middle of the section of fiber bragg grating by using a heating device; clearing the middle fiber bragg grating; stopping heating when the spectrometer monitors two reflection peaks; and forming the Fabry-Perot sensor by using the remaining two sections of fiber bragg gratings. The method is simple and has high manufacturing efficiency.

Description

A kind of method for making of fiber bragg grating Fabry-Perot sensor
Technical field
The present invention relates to Fabry-Perot sensor, be applicable to technical field of optical fiber sensing based on fiber grating.
Background technology
Fiber grating is one of the most rising, the most representative novel optical fiber passive device at present, advantages such as low consumption transmission, anti-electromagnetic interference (EMI), lightweight, footpath soften because it has, chemical stability and electrical isolation, therefore, fiber grating all has wide application prospect in fields such as optical fiber communication, Fibre Optical Sensor and optical information processing.
In recent years, fiber grating combines the research that forms sensor-based system and has caused people's extensive concern with other optical fibre interferometric sensor, this sensor can be widely used in health detection, compound substance health detection of large scale civil engineering structure etc., with implementation structure and online detection of intellectual material and analysis.
In the static strain measuring system, use optical fibre interferometric sensor can obtain very high resolution, its strain measurement shows the absolute phase variable quantity of interference signal
Figure BSA00000177950000011
(N is the integer striped,
Figure BSA00000177950000012
Be the decimal striped).Yet general optical fiber interference sensor ubiquity fringe count fuzzy problem has very big influence to resolution, the precision of sensor.And adopt Beat-Frequency Interferometer can well calculate the decimal striped, but this system needs two different frequency light sources that very high stability is arranged, and this is difficult to guarantee in actual measurement.The low coherence's of employing interferometer is a kind of highly effective method to the measurement of absolute phase variable quantity, but low coherence's interferometer generally needs phase tracking system, adopts stepper motor and piezoelectric ceramics device usually, makes the speed of measuring system reduce.Use the fiber grating strain sensor system fuzzy problem can not occur, but, limited the raising of Measurement Resolution because there is certain bandwidth in the fiber grating reflection wavelength.
Along with the development of modern surveying technology, optical fiber Fabry one Perot (Fabry-Perot) sensor more and more is subject to people's attention, and is widely used in measuring strain, pressure, vibration, acceleration, refractive index etc.And fiber grating and optical fiber Fabry one Perot sensor combined static strain is measured, not only can be solved the fuzzy problem of fibre optic interferometer striped, and can reach very high resolution.Existing fiber bragg grating Fabry-Perot sensor is produced the formation that is together in series of two fiber gratings on optical fiber, need produce two fiber gratings, makes more loaded down with trivial details comparatively speaking.
Summary of the invention
Technical matters to be solved by this invention provides a kind of method for making of fiber bragg grating Fabry-Perot sensor, simplifies the making of existing fiber bragg grating Fabry-Perot sensor, improves make efficiency.
Technical scheme of the present invention:
A kind of method for making of fiber bragg grating Fabry-Perot sensor, this method for making may further comprise the steps:
Step 1, wideband light source connect first port of circulator, and second port of circulator connects an end of optical fiber, and the 3rd port of circulator connects spectrometer;
Step 2, peeling optical fibre be the coat of 10mm～160mm wherein, the optical fiber that divests this section of coat is close to phase mask plate places and be fixed on the mobile platform;
Step 3 is opened wideband light source, spectrometer, laser instrument and computing machine;
Step 4, control signal control laser instrument that computing machine sends and the servomotor on the mobile platform, pool the wire hot spot behind the Ultra-Violet Laser process post lens, hot spot impinges upon on phase mask plate and the optical fiber after seeing through slit, and mobile platform is moved by servomotor control; On optical fiber, produce the long one section fiber grating of 9mm～140mm that is;
Step 5, heating arrangement places the top of optical fiber and aims at the centre of this section of fiber grating, start heating arrangement to heating in the middle of the fiber grating of this section, remove the middle fiber grating of this section fiber grating, when spectrometer monitors two reflection peaks, stop heating, remaining two sections fiber grating has just constituted a Fabry-Perot sensor.
Beneficial effect of the present invention: the method for making of a kind of fiber bragg grating Fabry-Perot sensor that the present invention proposes is very simple, not needing to produce two fiber gratings is together in series on optical fiber and forms the Fabry-Perot chamber, only need produce a fiber grating gets final product, cost is low, is easy to realize.What the bragg grating Fabry-Perot sensor of arrowband adopted is absolute, jamproof low Coherent Detection, and be not suitable for actual application, method for making of the present invention adopts the phase mask plate of different chirp values, write corresponding control programs, can produce the fiber bragg grating Fabry-Perot sensor of different bandwidth, be more suitable for practical application.
Description of drawings
The producing device synoptic diagram of a kind of fiber bragg grating Fabry-Perot sensor of Fig. 1.
Embodiment
Embodiment one
A kind of method for making of fiber bragg grating Fabry-Perot sensor, this method for making may further comprise the steps:
Step 1, wideband light source 1 connect first port 21 of circulator, and second port 22 of circulator connects an end of optical fiber 5, and the 3rd port 23 of circulator connects spectrometer 3.
Step 2, peeling optical fibre 5 is the coat of 10mm wherein, the optical fiber that divests this section of coat is close to phase mask plate 6 places and be fixed on the mobile platform 4.Optical fiber 5 adopts single-mode fiber.Phase mask plate 6 adopts the phase mask plate of warbling.
Step 3 is opened wideband light source 1, spectrometer 3, laser instrument 8 and computing machine 9;
Step 4, control signal control laser instrument 8 that computing machine 9 sends and the servomotor on the mobile platform 4, pool the wire hot spot behind the Ultra-Violet Laser process post lens 7, hot spot impinges upon on phase mask plate 6 and the optical fiber 5 after seeing through slit, and mobile platform 4 is moved by servomotor control; The length of making fiber grating is 9mm.
Step 5, heating arrangement 10 places the top of optical fiber 5 and to the centre of this section of 9mm fiber grating, start the middle heating of heating arrangement 10 to the fiber grating of this section, remove the fiber grating of the middle 1mm part of this section, when spectrometer 3 monitors two reflection peaks, stop heating, the fiber grating of remaining two sections each 4mm has just constituted a Fabry-Perot sensor.Heating arrangement 10 adopts carbon dioxide laser.
Embodiment two
A kind of method for making of fiber bragg grating Fabry-Perot sensor, and the difference of embodiment one:
Step 2, peeling optical fibre 5 is the coat of 160mm wherein, and optical fiber 5 adopts Active Optical Fiber.
Step 4, the length of making fiber grating on optical fiber 5 is 140mm.
Step 5, heating arrangement 10 places the top of optical fiber 5 and aims at the centre of this section of 140mm fiber grating, start the middle heating of heating arrangement 10 to the fiber grating of this section, remove the fiber grating of the middle 10mm part of this section, when spectrometer 3 monitors two reflection peaks, stop heating, the fiber grating of remaining two sections each 65mm has just constituted a Fabry-Perot sensor.Heating arrangement 10 adopts the arc heated device.
Embodiment three
A kind of method for making of fiber bragg grating Fabry-Perot sensor, and the difference of embodiment one:
Step 2, peeling optical fibre 5 is the coat of 80mm wherein, and optical fiber 5 adopts photonic crystal fiber.Phase mask plate 6 adopts even phase mask plate.
Step 4, the length of making fiber grating on optical fiber 5 is 70mm.
Step 5, heating arrangement 10 places the top of optical fiber 5 and aims at the centre of this section of 70mm fiber grating, start the middle heating of heating arrangement 10 to the fiber grating of this section, remove the fiber grating of the middle 6mm part of this section, when spectrometer 3 monitors two reflection peaks, stop heating, the fiber grating of remaining two sections each 32mm has just constituted a Fabry-Perot sensor.Heating arrangement 10 adopts the electrical spark working thermic devices.
Embodiment four
A kind of method for making of fiber bragg grating Fabry-Perot sensor, and the difference of embodiment one:
Step 2, peeling optical fibre 5 is the coat of 120mm wherein, and optical fiber 5 adopts polarization maintaining optical fibre.Phase mask plate 6 adopts even phase mask plate.
Step 4, the length of making fiber grating on optical fiber 5 is 100mm.
Step 5, heating arrangement 10 places the top of optical fiber 5 and aims at the centre of this section of 100mm fiber grating, start the middle heating of heating arrangement 10 to the fiber grating of this section, remove the fiber grating of the middle 8mm part of this section, when spectrometer 3 monitors two reflection peaks, stop heating, the fiber grating of remaining two sections each 46mm has just constituted a Fabry-Perot sensor.Heating arrangement 10 adopts the oxyhydrogen flame heating arrangement.
Device used in the present invention is commercially available device.

Claims (1)

1. the method for making of a fiber bragg grating Fabry-Perot sensor is characterised in that, this method for making may further comprise the steps:
Step 1, wideband light source (1) connect first port (21) of circulator, and second port (22) of circulator connects an end of optical fiber (5), and the 3rd port (23) of circulator connects spectrometer (3);
Step 2, on the peeling optical fibre (5), the coat of this section of 10mm～160mm optical fiber is close to phase mask plate (6) with this section optical fiber that divests coat and is placed and be fixed on the mobile platform (4);
Step 3 is opened wideband light source (1), spectrometer (3), laser instrument (8) and computing machine (9);
Step 4, control signal control laser instrument (8) that computing machine (9) sends and the servomotor on the mobile platform (4), pool the wire hot spot behind the Ultra-Violet Laser process post lens (7), hot spot impinges upon on phase mask plate (6) and the optical fiber (5) after seeing through slit, and mobile platform (4) is moved by servomotor control; On optical fiber (5), produce the long one section fiber grating of 9mm～140mm that is;
Step 5, heating arrangement (10) places the top of optical fiber (5) and aims at the centre of this section fiber grating, start heating arrangement (10) to heating in the middle of this section fiber grating, remove the fiber grating of the centre of this section fiber grating, when spectrometer (3) monitors two reflection peaks, stop heating, remaining two sections fiber grating has just constituted a Fabry-Perot sensor.
CN2010102211761A 2010-07-08 2010-07-08 Method for manufacturing fiber bragg grating Fabry-Perot sensor Expired - Fee Related CN101900576B (en)

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CN102109635B (en) * 2011-02-14 2012-05-02 南开大学 Method for writing and manufacturing laser pulse of tilt long period and ultra-long period fiber grating
CN102865946B (en) * 2012-09-11 2014-08-27 天津大学 Photonic crystal fiber temperature sensing probe and measuring system thereof
CN105259735B (en) * 2015-11-20 2020-09-29 武汉烽理光电技术有限公司 Online preparation device and method for weak fiber bragg grating Fabry-Perot cavity sensing array
CN106908896A (en) * 2017-03-31 2017-06-30 武汉光谷航天三江激光产业技术研究院有限公司 A kind of method and device for making fiber grating
CN109580036A (en) * 2019-01-22 2019-04-05 北京信息科技大学 FP temperature sensor and preparation method thereof based on photonic crystal fiber FBG
CN109708775A (en) * 2019-01-22 2019-05-03 北京信息科技大学 The temperature of photonic crystal fiber FP-FBG structure, index sensor and preparation method thereof

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