CN107907239B - Temperature sensing device based on chalcogenide glass material and construction method thereof - Google Patents
Temperature sensing device based on chalcogenide glass material and construction method thereof Download PDFInfo
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- CN107907239B CN107907239B CN201710982872.6A CN201710982872A CN107907239B CN 107907239 B CN107907239 B CN 107907239B CN 201710982872 A CN201710982872 A CN 201710982872A CN 107907239 B CN107907239 B CN 107907239B
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- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/32—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres
- G01K11/3206—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres at discrete locations in the fibre, e.g. using Bragg scattering
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Abstract
The invention discloses a temperature sensing device based on a chalcogenide glass material and a construction method thereof. The temperature sensitivity of the temperature sensing device based on the chalcogenide glass material can reach 2.97186 nm/DEG C, is obviously higher than the temperature sensitivity of 0.04-0.1 nm/DEG C of the traditional quartz long-period fiber grating sensor, is more suitable for high-sensitivity temperature sensing measurement, and has wide application prospect in the high-sensitivity sensing field.
Description
Technical Field
The invention relates to a sensing device, in particular to a temperature sensing device based on a chalcogenide glass material and a construction method thereof.
Background
Because the fiber core mold of forward transmission is coupled with the cladding mold of same-direction transmission, the long-period fiber grating can couple light of a certain frequency band in the guided wave into the cladding and is lost, and the period of the long-period fiber grating is between dozens of micrometers and hundreds of micrometers. The transmission characteristics of the long-period fiber grating can be changed due to the influence of factors such as external stress, environmental temperature and the like, and the sensing information can be obtained by tuning the resonant wavelength. The fiber grating sensor has the advantages of strong electromagnetic interference resistance, small volume, capability of being embedded in materials, easiness in connection with optical fibers and the like. Long period fiber gratings are more sensitive to environmental changes than bragg fiber gratings and are therefore often used in sensing applications. High sensitivity fiber grating temperature sensors are an important direction in the development of modern sensors. Most commonly, long period fiber grating based temperature sensing of quartz materials. The transmission range of the quartz material is generally not more than 2 μm, i.e. it cannot be applied to the mid-infrared band above 2 μm. The mid-infrared band is an extremely important atmospheric window, contains a plurality of molecular fingerprint areas, can be used for laser ranging, laser radars and atmospheric communication, and is also the working band of most military detectors. In addition, the temperature sensitivity of the quartz long-period fiber grating is generally 0.04-0.1 nm/DEG C, and the quartz long-period fiber grating cannot be applied to high-sensitivity sensing detection.
disclosure of Invention
The invention aims to provide a chalcogenide glass material-based temperature sensing device with high temperature sensitivity and good temperature stability and a building method thereof.
The technical scheme adopted by the invention for solving the technical problems is as follows: the temperature sensing device based on the chalcogenide glass material comprises a broadband light source, a first spectrum analyzer and a long-period fiber grating made of the chalcogenide glass material, wherein two ends of the long-period fiber grating are respectively connected with the broadband light source and the first spectrum analyzer, and the long-period fiber grating is obtained by melting and tapering a single-mode chalcogenide glass material optical fiber into a tapered chalcogenide optical fiber and writing the tapered chalcogenide optical fiber into the long-period optical grating through femtosecond laser pulses.
the chalcogenide glass material has the advantages of wide infrared transmission range, high nonlinear coefficient, low phonon energy and the like, and the thermo-optic coefficient of the chalcogenide glass material is larger than that of a quartz material; compared with the common optical fiber, the tapered chalcogenide optical fiber has a mixing effect, so that the spatial distribution of light energy is more uniform, and high-energy focusing can be realized. The invention combines the excellent characteristics of the tapered chalcogenide fiber and the long-period fiber grating, utilizes the femtosecond laser pulse to write the long-period fiber grating on the tapered chalcogenide fiber, realizes higher sensitivity and better temperature stability of the temperature sensing device, and the long-period fiber grating is not easy to erase at high temperature.
When the temperature changes, the wavelength of the long-period fiber grating in the temperature sensing device based on the chalcogenide glass material changes, the temperature sensing device obtains temperature information to be detected by measuring the position change of the resonance wavelength caused by the temperature change, and the temperature information can be accurately detected. The temperature sensitivity of the temperature sensing device based on the chalcogenide glass material can reach 2.97186 nm/DEG C, is obviously higher than the temperature sensitivity of 0.04-0.1 nm/DEG C of the traditional quartz long-period fiber grating sensor, is more suitable for high-sensitivity temperature sensing measurement, and has wide application prospect in the high-sensitivity sensing field.
Preferably, the transmission center wavelength of the long-period fiber grating is 1510-1590 nm, and the band gap depth is greater than 8 dB.
Preferably, the wavelength range of the broadband light source is 800-2000 nm, and the measurement range of the first spectrum analyzer is 500-2500 nm.
Preferably, the femtosecond laser pulse has a wavelength of 800nm and a repetition frequency of 1 kHz.
Preferably, the chalcogenide glass material is a Ge-As-Se chalcogenide glass material, a Ge-Sb-Se chalcogenide glass material, an As-Se chalcogenide glass material or an As-S chalcogenide glass material.
Preferably, the exit end of the broadband light source is connected with the entrance end of the long-period fiber grating through a first single-mode fiber jumper, a first flange plate and a first bare fiber adapter in sequence, and the exit end of the long-period fiber grating is connected with the entrance end of the first spectrum analyzer through a second bare fiber adapter, a second flange plate and a second single-mode fiber jumper in sequence.
The building method of the temperature sensing device based on the chalcogenide glass material comprises the following steps:
(1) Drawing of tapered chalcogenide optical fibers
Heating the single-mode chalcogenide glass material optical fiber by adopting a melting tapering method, wherein the heating temperature is 30-80 ℃ above the softening temperature of the chalcogenide glass material, and drawing the single-mode chalcogenide glass material optical fiber into a tapered chalcogenide optical fiber;
(2) inscribing of long period grating
The femtosecond laser direct writing system is built, the femtosecond laser direct writing system comprises a femtosecond laser, a half-wave plate, a Glan prism, an attenuation plate, an electronic shutter, a power meter, a first beam splitter, a CCD, a lens, a dichroic mirror, a CCD lighting source, a second beam splitter, a focusing objective lens, a precise moving platform, a halogen tungsten lamp, a second spectrum analyzer and a computer, the femtosecond laser, the half-wave plate, the Glan prism, the attenuation plate, the electronic shutter, the first beam splitter, the dichroic mirror, the second beam splitter, the focusing objective lens and the precise moving platform are built on an optical platform in sequence, an optical fiber clamp is placed on the precise moving platform, the computer is respectively connected with the electronic shutter and the precise moving platform, the movement of the precise moving platform is controlled by the computer, and the power meter is connected with the first beam splitter, connecting the dichroic mirror with the lens and the CCD in sequence, connecting the second beam splitter with the CCD illumination light source, fixing the tapered chalcogenide optical fiber obtained by drawing in the step (1) on the optical fiber clamp, connecting one end of the tapered chalcogenide optical fiber with the tungsten halogen lamp through a third bare fiber adapter and a third flange disc in sequence, and connecting the other end of the tapered chalcogenide optical fiber with the second spectrum analyzer through a fourth bare fiber adapter and a fourth flange disc in sequence;
after the femtosecond laser direct writing system is built, the femtosecond laser is started, the femtosecond laser pulse emitted by the femtosecond laser is exposed by the electronic shutter after the intensity of the femtosecond laser pulse is adjusted by the half-wave plate, the Glan prism and the attenuation plate, and then reaches the dichroic mirror after passing through the first beam splitter to be reflected, the reflected laser pulse enters the focusing objective lens after passing through the second beam splitter and is focused on the tapered chalcogenide optical fiber, the fiber grating is exposed and inscribed on the conical chalcogenide fiber, and the precise moving platform is controlled by the computer to slowly translate when inscribing, and a halogen tungsten lamp and a second spectrum analyzer are used as an online real-time monitoring system to observe the change condition of the transmission spectrum of the inscribed fiber grating, adjusting laser parameters of the femtosecond laser and the exposure time of the electronic shutter in time according to the transmission spectrum recorded by the second spectrum analyzer, and finally writing to obtain the long-period fiber bragg grating made of the chalcogenide glass material;
(3) establishment of temperature characteristic curve of long period optical fiber grating
Measuring the change of the transmission spectrum of the long-period fiber grating at different temperatures, and establishing a wavelength-transmission spectrum curve;
measuring the resonant wavelength of the long-period fiber grating at different temperatures, and establishing a temperature-resonant wavelength curve of the long-period fiber grating;
(4) Construction of temperature sensing device
one end of the long-period fiber grating obtained by writing is connected with the broadband light source, the other end of the long-period fiber grating is connected with the first spectrum analyzer, and then the temperature sensing device based on the chalcogenide glass material is built.
Compared with the prior art, the invention has the advantages that: the chalcogenide glass material-based temperature sensing device disclosed by the invention combines the excellent characteristics of the tapered chalcogenide optical fiber and the long-period optical fiber grating, and the femtosecond laser pulse is used for writing the long-period optical fiber grating on the tapered chalcogenide optical fiber, so that the higher sensitivity and the better temperature stability of the temperature sensing device are realized, and the long-period optical fiber grating is not easy to erase at high temperature. When the temperature changes, the wavelength of the long-period fiber grating in the temperature sensing device changes, the temperature information to be detected is obtained by measuring the position change of the resonance wavelength caused by the temperature change, and the temperature information can be accurately detected. The temperature sensitivity of the temperature sensing device based on the chalcogenide glass material can reach 2.97186 nm/DEG C, is obviously higher than the temperature sensitivity of 0.04-0.1 nm/DEG C of the traditional quartz long-period fiber grating sensor, is more suitable for high-sensitivity temperature sensing measurement, and has wide application prospect in the high-sensitivity sensing field.
Drawings
FIG. 1 is a schematic diagram showing the structural connection of a chalcogenide glass material-based temperature sensing device according to an embodiment;
FIG. 2 is a schematic view of a tapered chalcogenide fiber drawn from a single-mode Ge-As-Se chalcogenide glass material fiber in example 1;
FIG. 3 is a schematic structural connection diagram of a femtosecond laser direct writing system built in the embodiment;
FIG. 4 is a wavelength-transmission spectrum plot of a long-period fiber grating written in example 1;
FIG. 5 is a temperature-resonance wavelength curve of a long-period fiber grating written in example 1;
FIG. 6 is a plot of the outside diameter of the taper region versus the temperature sensitivity of a long-period fiber grating made of Ge-As-Se chalcogenide glass material.
Detailed Description
the following examples further describe the invention in detail with reference to the accompanying drawings.
the temperature sensing device based on the chalcogenide glass material in embodiment 1, As shown in fig. 1, includes a broadband light source a, a first spectrum analyzer B, and a long-period fiber grating C made of Ge-As-Se chalcogenide glass material, an exit end of the broadband light source a is connected to an incident end of the long-period fiber grating C through a first single-mode fiber jumper D, a first flange E, and a first bare fiber adapter F in sequence, an exit end of the long-period fiber grating C is connected to an incident end of the first spectrum analyzer B through a second bare fiber adapter G, a second flange H, and a second single-mode fiber jumper I in sequence, and the long-period fiber grating C is obtained by melting and tapering a single-mode chalcogenide glass material fiber into a tapered chalcogenide fiber and writing the tapered chalcogenide fiber into the long-period grating through femtosecond laser pulses.
the method for building the temperature sensing device based on the Ge-As-Se chalcogenide glass material in the embodiment 1 comprises the following steps:
(1) Drawing of tapered chalcogenide optical fibers
the single-mode Ge-As-Se chalcogenide glass material optical fiber (the diameter of the fiber core is 40 mu m, the diameter of the cladding is 200 mu m, and the numerical aperture NA is 0.29) is heated by adopting a fused biconical taper method, the heating temperature is 290 ℃, the single-mode Ge-As-Se chalcogenide glass material optical fiber is drawn into a tapered chalcogenide optical fiber (the structural schematic diagram is shown in figure 2), and the outer diameter of the tapered region (namely the outer diameter of the taper waist) is 10 mu m. The specific drawing method can refer to 'a preparation method of Ge-Sb-Se chalcogenide tapered optical fiber with different taper waists' (application No. 201610240404.7);
(2) inscribing of long period grating
a femtosecond laser direct writing system is built, as shown in fig. 3, the femtosecond laser direct writing system comprises a femtosecond laser 1, a half-wave plate 2, a Glan prism 3, an attenuation plate 4, an electronic shutter 5, a power meter 6, a first beam splitter 71, a CCD8, a lens 9, a dichroic mirror 10, a CCD lighting source 11, a second beam splitter 72, a focusing objective lens 12, a precise moving platform 13, a halogen tungsten lamp 17, a second spectrum analyzer 20 and a computer 14, the femtosecond laser 1, the half-wave plate 2, the Glan prism 3, the attenuation plate 4, the electronic shutter 5, the first beam splitter 71, the dichroic mirror 10, the second beam splitter 72, the focusing objective lens 12 and the precise moving platform 13 are built on an optical platform in sequence, an optical fiber clamp is placed on the precise moving platform 13, the computer 14 is respectively connected with the electronic shutter 5 and the precise moving platform 13, the movement of the precise moving platform 13 is controlled by the computer 14, simultaneously, connecting a power meter 6 with a first beam splitter 71, sequentially connecting a dichroic mirror 10 with a lens 9 and a CCD8, connecting a second beam splitter 72 with a CCD illumination light source 11, fixing the tapered chalcogenide optical fiber 21 obtained by drawing in the step (1) on an optical fiber clamp (not shown in the figure), then connecting one end of the tapered chalcogenide optical fiber 21 with a halogen tungsten lamp 17 through a third bare fiber adapter 15 and a third flange plate 16 in sequence, and connecting the other end of the tapered chalcogenide optical fiber 21 with a second spectrum analyzer 20 through a fourth bare fiber adapter 18 and a fourth flange plate 19 in sequence;
After the femtosecond laser direct writing system is built, the femtosecond laser 1 is started, the femtosecond laser 1 emits laser pulses with the wavelength of 800nm and the repetition frequency of 1kHz, the laser pulses are subjected to intensity adjustment through the half-wave plate 2, the Glan prism 3 and the attenuation plate 4 (the laser power is 40mW), are exposed for 10s through the electronic shutter 5, reach the dichroic mirror 10 through the first beam splitter 71 and are reflected, the reflected laser pulses enter the focusing objective 12(40 x, NA is 0.6) through the second beam splitter 72 and are focused on the tapered chalcogenide optical fiber 21, the fiber grating is exposed and written on the tapered chalcogenide optical fiber 21, the precise moving platform 13 is controlled through the computer 14 during writing, the precise moving platform 13 is slowly translated, the halogen tungsten lamp 17 and the second spectrum analyzer 20 are used as an online real-time monitoring system, the change condition of the transmission spectrum of the written fiber grating is observed, adjusting the laser parameters of the femtosecond laser 1 and the exposure time of the electronic shutter 5 in time according to the transmission spectrum recorded by the second spectrum analyzer 20, and finally writing to obtain a long-period fiber grating made of chalcogenide glass material, wherein the center wavelength of the long-period fiber grating is 1534nm, the period is 380 μm, the period number N is 50, and the outer diameter is 10 μm;
(3) Establishment of temperature characteristic curve of long period optical fiber grating
When the external temperature is measured to change from 25 ℃ to 85 ℃ at intervals of 20 ℃, the change graph of the transmission spectrum of the inscribed long-period fiber grating is shown, and specifically, the wavelength-transmission spectrum curve is shown in fig. 4. Fig. 5 is a temperature-resonance wavelength curve of the long-period fiber grating, which is the resonance wavelength of the long-period fiber grating at different temperatures, where the curve shown in fig. 5 is a straight line, the slope of the straight line is the temperature sensitivity of the long-period fiber grating C made of Ge-As-Se chalcogenide glass material, the temperature sensitivity is 2.97186 nm/deg.c, and the linearity is R2-0.9998.
(4) Construction of temperature sensing device
One end of a long-period fiber grating C obtained by writing is connected with a broadband light source with the wavelength range of 800-2000 nm, the other end of the long-period fiber grating C is connected with a first spectrum analyzer B with the measurement range of 500-2500 nm, and then the temperature sensing device based on the chalcogenide glass material is set up, when the temperature sensing device is used for detecting the environment temperature, the temperature change of a temperature area J to be detected is converted into the change of the resonance center wavelength of the long-period fiber grating C, and the size of the environment temperature can be detected by comparing a wavelength-transmittance spectrum curve and a temperature-resonance wavelength curve.
The femtosecond laser 1 used in the embodiment 1 can adopt a Mira 900D titanium gem tunable femtosecond laser provided by the American coherent company, and combines with a Legend Elite + Opera Solo femtosecond laser optical parametric amplification system (laser working wavelength tuning range is 0.5-20 μm); the broadband light source A can be a VENUS series F-P type semiconductor laser light source provided by Shanghai Kentitt company, and the spectral width is 0.4-2.4 μm.
the outer diameter of the taper region of the long period fiber grating made of the Ge-As-Se chalcogenide glass material in example 1 was 10 μm, and the temperature sensitivity was 2.97186 nm/deg.C. The outside diameters of the conical regions are different, and the temperature sensitivity of the long-period fiber grating is different. FIG. 6 is a plot of the outside diameter of the taper region versus the temperature sensitivity of a long-period fiber grating made of Ge-As-Se chalcogenide glass material.
Example 2: the temperature sensing device is basically the same as the temperature sensing device in the embodiment 1 in structure and construction method, except that in the embodiment 2, the adopted chalcogenide glass material is Ge-Sb-Se, and the temperature sensitivity is 2.76541 nm/DEG C.
example 3: the temperature sensing device of the embodiment 1 is basically the same in composition and construction method, except that in the embodiment 3, As-Se is used As the chalcogenide glass material, and the temperature sensitivity is 1.52049 nm/DEG C.
Example 4: the temperature sensing device is basically the same As the temperature sensing device in the embodiment 1 in structure and construction method, except that in the embodiment 4, the adopted chalcogenide glass material is As-S, and the temperature sensitivity is 0.7428 nm/DEG C.
Claims (6)
1. The temperature sensing device based on the chalcogenide glass material is characterized by comprising a broadband light source, a first spectrum analyzer and a long-period fiber grating made of the chalcogenide glass material, wherein two ends of the long-period fiber grating are respectively connected with the broadband light source and the first spectrum analyzer, the long-period fiber grating is obtained by melting and tapering a single-mode chalcogenide glass material optical fiber into a tapered chalcogenide optical fiber and writing the tapered chalcogenide optical fiber into the long-period fiber grating through femtosecond laser pulses, and the construction method of the temperature sensing device comprises the following steps:
(1) Drawing of tapered chalcogenide optical fibers
Heating the single-mode chalcogenide glass material optical fiber by adopting a melting tapering method, wherein the heating temperature is 30-80 ℃ above the softening temperature of the chalcogenide glass material, and drawing the single-mode chalcogenide glass material optical fiber into a tapered chalcogenide optical fiber;
(2) inscribing of long period grating
The femtosecond laser direct writing system is built, the femtosecond laser direct writing system comprises a femtosecond laser, a half-wave plate, a Glan prism, an attenuation plate, an electronic shutter, a power meter, a first beam splitter, a CCD, a lens, a dichroic mirror, a CCD lighting source, a second beam splitter, a focusing objective lens, a precise moving platform, a halogen tungsten lamp, a second spectrum analyzer and a computer, the femtosecond laser, the half-wave plate, the Glan prism, the attenuation plate, the electronic shutter, the first beam splitter, the dichroic mirror, the second beam splitter, the focusing objective lens and the precise moving platform are built on an optical platform in sequence, an optical fiber clamp is placed on the precise moving platform, the computer is respectively connected with the electronic shutter and the precise moving platform, the movement of the precise moving platform is controlled by the computer, and the power meter is connected with the first beam splitter, connecting the dichroic mirror with the lens and the CCD in sequence, connecting the second beam splitter with the CCD illumination light source, fixing the tapered chalcogenide optical fiber obtained by drawing in the step (1) on the optical fiber clamp, connecting one end of the tapered chalcogenide optical fiber with the tungsten halogen lamp through a third bare fiber adapter and a third flange disc in sequence, and connecting the other end of the tapered chalcogenide optical fiber with the second spectrum analyzer through a fourth bare fiber adapter and a fourth flange disc in sequence;
after the femtosecond laser direct writing system is built, the femtosecond laser is started, the femtosecond laser pulse emitted by the femtosecond laser is exposed by the electronic shutter after the intensity of the femtosecond laser pulse is adjusted by the half-wave plate, the Glan prism and the attenuation plate, and then reaches the dichroic mirror after passing through the first beam splitter to be reflected, the reflected laser pulse enters the focusing objective lens after passing through the second beam splitter and is focused on the tapered chalcogenide optical fiber, the fiber grating is exposed and inscribed on the conical chalcogenide fiber, and the precise moving platform is controlled by the computer to slowly translate when inscribing, and a halogen tungsten lamp and a second spectrum analyzer are used as an online real-time monitoring system to observe the change condition of the transmission spectrum of the inscribed fiber grating, adjusting laser parameters of the femtosecond laser and the exposure time of the electronic shutter in time according to the transmission spectrum recorded by the second spectrum analyzer, and finally writing to obtain the long-period fiber bragg grating made of the chalcogenide glass material;
(3) Establishment of temperature characteristic curve of long period optical fiber grating
measuring the change of the transmission spectrum of the long-period fiber grating at different temperatures, and establishing a wavelength-transmission spectrum curve;
Measuring the resonant wavelength of the long-period fiber grating at different temperatures, and establishing a temperature-resonant wavelength curve of the long-period fiber grating;
(4) Construction of temperature sensing device
one end of the long-period fiber grating obtained by writing is connected with the broadband light source, the other end of the long-period fiber grating is connected with the first spectrum analyzer, and then the temperature sensing device based on the chalcogenide glass material is built.
2. The chalcogenide glass material-based temperature sensing device according to claim 1, wherein the transmission center wavelength of the long period fiber grating is 1510-1590 nm, and the band gap depth is greater than 8 dB.
3. the chalcogenide glass material-based temperature sensing device as claimed in claim 1, wherein the broadband light source has a wavelength range of 800-2000 nm, and the first spectrum analyzer has a measurement range of 500-2500 nm.
4. the chalcogenide glass material-based temperature sensing device according to claim 1, wherein the femtosecond laser pulse has a wavelength of 800nm and a repetition frequency of 1 kHz.
5. The chalcogenide glass material-based temperature sensing device according to claim 1, wherein the chalcogenide glass material is a Ge-As-Se chalcogenide glass material, a Ge-Sb-Se chalcogenide glass material, an As-Se chalcogenide glass material, or an As-S chalcogenide glass material.
6. The chalcogenide glass material-based temperature sensing device according to claim 1, wherein an exit end of the broadband light source is connected with an entrance end of the long-period fiber grating through a first single-mode fiber jumper, a first flange plate and a first bare fiber adapter in sequence, and an exit end of the long-period fiber grating is connected with an entrance end of the first spectrum analyzer through a second bare fiber adapter, a second flange plate and a second single-mode fiber jumper in sequence.
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| CN109406439A (en) * | 2018-11-20 | 2019-03-01 | 宁波大学 | Gas sensor, the preparation method of gas sensor and gas-detecting device |
| CN109406440B (en) * | 2018-11-20 | 2021-05-14 | 宁波大学 | Gas detection method based on chalcogenide glass suspension core optical fiber |
| CN109407205B (en) * | 2018-12-19 | 2020-12-29 | 宁波大学 | Manufacturing device and manufacturing method of chalcogenide glass fiber end face diffraction grating |
| CN110879437B (en) * | 2019-11-29 | 2021-05-28 | 江苏师范大学 | Preparation device and preparation method of chalcogenide glass fiber Bragg grating |
| CN111302616B (en) * | 2020-03-27 | 2022-03-04 | 宁波大学 | Laser direct-writing preparation method of chalcogenide glass optical fiber |
| CN111999796B (en) * | 2020-08-17 | 2023-06-02 | 南昌大学 | Method for rapidly manufacturing chalcogenide glass optical fiber Bragg grating with high reflectivity |
| CN113029383B (en) * | 2021-03-16 | 2023-11-21 | 长江师范学院 | Double-parameter measurement method based on spiral long-period fiber grating |
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| CN1472552A (en) * | 2003-06-24 | 2004-02-04 | 重庆大学 | Singe lnog period optical fiber gratings based simultaneous temperature and load measuring method and sensor |
| CN101571614B (en) * | 2009-05-31 | 2011-05-11 | 北京航空航天大学 | Optical fiber beam converter |
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