CN109374027A - A kind of bis- parameter fibre optical sensors of Sagnac based on high birefringence micro-nano fiber - Google Patents
A kind of bis- parameter fibre optical sensors of Sagnac based on high birefringence micro-nano fiber Download PDFInfo
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- CN109374027A CN109374027A CN201811449118.7A CN201811449118A CN109374027A CN 109374027 A CN109374027 A CN 109374027A CN 201811449118 A CN201811449118 A CN 201811449118A CN 109374027 A CN109374027 A CN 109374027A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
- G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
- G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
- G01D5/353—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre
- G01D5/35306—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre using an interferometer arrangement
- G01D5/35322—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre using an interferometer arrangement using interferometer with one loop with several directions of circulation of the light, e.g. Sagnac interferometer
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Abstract
The invention discloses a kind of bis- parameter fibre optical sensors of Sagnac based on high birefringence micro-nano fiber, the Saganc sensing unit including wideband light source and built-in high birefringence micro-nano fiber；The Saganc sensing unit input terminal receives wideband light source, output spectrum interference signal, refractive index, temperature have different sensitivity respectively for the mode-interference as existing for Sagnac sensing unit inner light beam and Sagnac interference, therefore, Wavelength demodulation is carried out to the interference signal of output spectrum, it can be achieved that the double parameters of refractive index, temperature sensing.Fibre optical sensor provided by the invention not only has the characteristics that all -fiber, compact-sized, inexpensive, production is simple, low-loss, but also realizes the sensing of refractive index and the double parameters of temperature.
Description
Technical field
The invention belongs to fibre optical sensor field, more particularly, to a kind of based on high birefringence micro-nano fiber
The bis- parameter fibre optical sensors of Sagnac.
Background technique
Fibre optical sensor realizes the transmission and perception of measured signal using light wave as carrier, by medium of optical fiber, and traditional
Sensor is compared, and fibre optical sensor shows electromagnetism interference, light-weight, high sensitivity, advantages of simple structure and simple；With change
The increase of the application fields demand such as, biology, medicine, researchers start to be dedicated to the research of many reference amounts optical fiber sensing technology,
Middle realization temperature, refractive index dual sampling needs solve the problems, such as that the two cross sensitivity has also received extensive attention.
Be currently used in temperature, refractive index two parameter measurement fibre optical sensor usually by bragg grating, long period
The structural levels such as fiber grating are coupled to another sensor and are made, relatively high to fiber grating inscription technical requirements, temperature sensitive
Degree is relatively low, and this kind of fibre optical sensor, and light incident side and exit end are all located at greatly heteropleural, is unfavorable for the two and is integrated,
Be not particularly suitable for slit, it is remote when sensing；Refractive index, the temperature of existing cascade mode interferometer and Sagnac interferometer
Dual sampling device is spent, light incidence and outgoing may be implemented positioned at ipsilateral, but sensing unit consists of two parts, structure is not tight
It gathers.
Therefore, study it is a kind of it is at low cost, production is simple, high sensitivity, it is compact-sized, repeatable it is high, application environment is rich
Rich refractive index, temperature dual sampling device are in research still with higher and application value at present.
Summary of the invention
In view of the drawbacks of the prior art, the purpose of the present invention is to provide a kind of based on high birefringence micro-nano fiber
The bis- parameter fibre optical sensors of Sagnac, it is intended to solve temperature sensitivity existing for existing two parameter measurement sensor is low, structure not
The compact problem for causing integrated level lower.
To achieve the above object, the present invention provides a kind of bis- parameter optical fiber of Sagnac based on high birefringence micro-nano fiber
Sensor, the Saganc sensing unit including wideband light source and built-in high birefringence micro-nano fiber；
The input terminal of the Saganc sensing unit is connected with wideband light source fused fiber splice, and output end and spectroanalysis instrument are molten
It connects connected；
The Saganc sensing unit is classified as the opposite two-way light beam of transmission direction for receiving wideband light source,
Optical transmission mode is excited and screened, and then two-way light beam generates mode-interference and Sagnac interference, passes through Wavelength demodulation realization pair
The detection of external environment refractive index, temperature change；
The wideband light source is used to provide light source for Saganc sensing unit；
The Saganc sensing unit includes three-dB coupler and high birefringence micro-nano fiber；
High birefringence micro-nano fiber first port of switch-in coupler second side and by way of fused fiber splice
Between Two-port netwerk, the Sagnac ring of closure is formed in second side of three-dB coupler 21；
The two sides of the three-dB coupler are respectively provided with there are two port, and the first port in the first side of three-dB coupler is provided with
Optical path incidence end P1 is for receiving wideband light source；Second port in the first side of three-dB coupler is provided with optical path exit end P2 use
In output interference spectrum；The first port of three-dB coupler second side is provided with the end P3, transmits the obtained from three-dB coupler
One light beam, the first light beam is along Sagnac ring clockwise transmission to the end P4；The second port of three-dB coupler second side is provided with P4
The second light beam obtained from three-dB coupler is transmitted at end, and the second light beam is along Sagnac ring counterclockwise transmission to the end P3, final two light
Beam mutually converges at three-dB coupler, exports from the end exit end P2；
The high birefringence micro-nano fiber is made of high-birefringence polarisation-maintaining optical fiber fused biconical taper, leads to optical fiber taper transition region
Diameter opposing waist region be relatively large in diameter, the pyramidal structure for being about 2.5 μm in lumbar region diameter can excite different optical modes and be sieved
Choosing；The high birefringence micro-nano fiber includes silica-base material region and stressed zone simultaneously, and inside has non-circular symmetrical refraction rate point
Cloth characteristic, and birefringent parameter B is greater than the birefringent parameter 10 of Standard single-mode fiber-6~10-5, as generate Sagnac must
Condition is wanted, it can be achieved that sensor monitoring to temperature；
The three-dB coupler realizes Sagnac interference for receiving wideband light source and light splitting coupling；
The high birefringence micro-nano fiber is excited along Sagnac ring clockwise and anticlockwise using nonadiabatic conical gradual change area
The two-beam of transmission generates multiple optical modes with different effective refractive indexs, and as birefringent micro-nano fiber is along waist direction
Diameter becomes smaller, and more and more high-order optical modes are ended, finally only HE11Mould, TE01Mould and TM01Mould passes through uniform lumbar region；
The optical mode TE of output01Mould and TM01Sensitive, temperature-insensitive characteristic the mould with refractive index can be formed between mould
Formula interference spectrum；
TE01Mould and TM01The normalized output luminous intensity T of mould can be indicated are as follows:
WhereinIt is TE01And TM01Between phase difference, λ is wavelength, Δ L=l (n1-n2) it is TE01With
TM01Between optical path difference, by the effective refractive index n of the two1And n2And the length l of polarization maintaining optical fibre cone waist is determined；Two-mode has
Imitate refringence n1-n2It is closely related with external environment variations in refractive index, therefore the mode-interference changes extraneous ambient refractive index
It is sensitive.
It is described to generate phase after high birefringence micro-nano fiber along the first light beam of Sagnac ring transmission and the second light beam
DifferenceIt meets at three-dB coupler and there is the Sagnac of high temperature sensitivity to interfere, Sagnac interference spectrum
It may be expressed as:
Wherein B indicates the birefringent of high birefringence micro-nano fiber, L and λ be respectively high birefringence micro-nano fiber length and
Operative wavelength.The birefringent B of high birefringence micro-nano fiber is sensitive to extraneous temperature change, and when being used for temperature sensing, Sagnac is dry
The wavelength shift for relating to the variation of dip wavelength with temperature is represented byWherein T is temperature.
Contemplated above technical scheme through the invention, compared with prior art, can obtain it is following the utility model has the advantages that
(1) present invention prepares high birefringence micro-nano fiber using high-birefringence polarisation-maintaining optical fiber fused biconical taper, have it is small in size,
The advantages of low, high refractive index sensitivity is lost, has established the basis of the two-parameter measurement of refractive index and temperature.
(2) structure is simple in Sagnac sensing unit ring of the invention, is only melted by one section of high birefringence micro-nano fiber both ends
Standard single-mode fiber composition is connect, is cascaded without more structures, and all devices are all made of all -fiber coupled modes, it is compact-sized steady
It is fixed, anti-interference ability is stronger, environmental monitoring, biochemical sensitive and in terms of application value with higher.
(3) high birefringence micro-nano fiber provided by the invention is placed in two of the side coupler D2 by way of fused fiber splice
Port, being formed, there is the Sagnac of high temperature sensitivity to interfere, and it is high to make simple, at low cost and repeatability.
Detailed description of the invention
Fig. 1 is the composed structure schematic diagram of the bis- parameter fibre optical sensors of Sagnac of the present invention；
Fig. 2 is the Saganc sensing unit structures schematic diagram of high birefringence micro-nano fiber built in the present invention；
Fig. 3 is the schematic cross-section of high birefringence micro-nano fiber in the present invention；
Fig. 4 is the main view of high birefringence micro-nano fiber in the present invention；
Fig. 5 is the relational graph of Sagnac interference and mode-interference and temperature of the present invention.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
The present invention has shown a kind of bis- parameter fibre optical sensors of the Sagnac based on high birefringence micro-nano fiber, as shown in Figure 1,
Saganc sensing unit 2 including wideband light source 1 and built-in high birefringence micro-nano fiber；
The input terminal of the Saganc sensing unit 2 connects wideband light source 1, and output end connects spectrometer 3；The broadband light
Source 1, Saganc sensing unit 2 and spectrometer 3 are connected with each other by way of fused fiber splice；
The Saganc sensing unit 2 is classified as the opposite two-way light beam of transmission direction for receiving wideband light source,
Optical transmission mode is excited and screened, and then obtains mode-interference and the Sagnac interference of the generation of two-way light beam, passes through Wavelength demodulation
Realize the detection to extraneous ambient refractive index, temperature change；
The wideband light source 1 is used to provide light source for Saganc sensing unit 2；
As shown in Fig. 2, the Saganc sensing unit 2 includes a three-dB coupler 21 and one section of high birefringence micro-nano light
Fibre 22；
The first end of described second side of switch-in coupler 21 by way of fused fiber splice of high birefringence micro-nano fiber 22
Between mouth and second port, the Sagnac ring 23 of closure is formed in second side of coupler 21；
The two sides of the three-dB coupler 21 are respectively provided with there are two port, the first port in the first side of three-dB coupler 21
Light beam incidence end P1 is provided with for receiving wideband light source 1；Second port in 21 first side of three-dB coupler is provided with light beam and goes out
Penetrate end P2 output interference spectrum；The first port of second side of three-dB coupler 21 is provided with the end P3, transmits from three-dB coupler
21 the first obtained light beams, the first light beam is along 23 clockwise transmission of Sagnac ring to the end P4；In second side of three-dB coupler 21
Second port is provided with the end P4, transmits the second light beam obtained from three-dB coupler 21, and the second light beam is counterclockwise along Sagnac ring 23
It is transmitted to the end P3, final two light beam mutually converges at three-dB coupler 21, exports from the end exit end P2.
As shown in figure 3, the high birefringence micro-nano fiber 22 is made of high-birefringence polarisation-maintaining optical fiber fused biconical taper, such as Fig. 4
It is shown, lead to being relatively large in diameter for the diameter opposed optical fibers waist location in optical fiber both ends conical gradual change area, tapered structure, fibre core is straight
Diameter due to drawing cone to become very little, therefore stressed zone is only described in Fig. 3 and without fibre core, and the order of magnitude of cladding diameter be micron or
Nanometer, less than 250 μm of diameter of ordinary optic fibre, can excite different optical modes and be screened；The high birefringence micro-nano simultaneously
Optical fiber includes silica-base material region and stressed zone, and inside has non-circular symmetrical refraction rate distribution character, and birefringent parameter B is greater than
The birefringent parameter 10 of Standard single-mode fiber-6~10-5, the necessary condition as generation Sagnac interference is, it can be achieved that temperature
Sensor monitoring；
The three-dB coupler 21 realizes Sagnac interference for receiving wideband light source and light splitting coupling；
The conical gradual change area of the high birefringence micro-nano fiber 22 and air constitute the biggish multimode waveguide knot of refringence
Structure is used to the two-beam transmitted clockwise and anticlockwise along Sagnac ring 23 exciting multiple light with different effective refractive indexs
Mode, with becoming smaller for 22 lumbar region diameter of taper high birefringence micro-nano fiber, more and more higher order modes are ended, final to only have
HE11Mould, TE01Mould and TM01Mould passes through uniform lumbar region；
The optical mode TE of output01Mould and TM01Mode-interference and Sagnac interference are existed simultaneously between mould, it is dry using two kinds
The characteristic that refractive index, temperature respectively have different sensitivity is related to, spectrometer can demodulate refractive index, temperature by wavelength simultaneously
Parameter；
The TE01Mould and TM01After carrying out mode-interference between mould, normalized output luminous intensity T can be indicated are as follows:
WhereinIt is TE01And TM01Between phase difference, λ is wavelength, Δ L=l (n1-n2) it is TE01With
TM01Between optical path difference, by the effective refractive index n of the two1And n2And the length l of polarization maintaining optical fibre cone waist is determined；Two-mode has
Imitate refringence n1-n2It is closely related with external environment variations in refractive index, therefore the mode-interference changes extraneous ambient refractive index
It is sensitive；
It is described to generate phase after high birefringence micro-nano fiber 22 along the first light beam of Sagnac ring transmission and the second light beam
Potential differenceIt meets at three-dB coupler 21 and there is the Sagnac of high temperature sensitivity to interfere, Sagnac is dry
Relating to spectrum may be expressed as:
Wherein B indicates the birefringent of high birefringence micro-nano fiber 22, and L and λ are respectively the length of high birefringence micro-nano fiber 22
Degree and operative wavelength.The birefringent B of high birefringence micro-nano fiber 22 is sensitive to extraneous temperature change, when being used for temperature sensing,
The wavelength shift of Sagnac interference dip wavelength with temperature variation is represented byWherein T is temperature.
Fig. 5 is that the spectrum that the bis- parameter fibre optical sensor tests of Sagnac obtain is increased with temperature, Sagnac interference wave long hair
The constant experimental result picture of raw drift, mode-interference envelope, wherein abscissa is wavelength, and ordinate is transmitted optical power, from Fig. 4
As can be seen that being superimposed the mode-interference envelope in high birefringence micro-nano fiber, mode-interference on the basis of Sagnac interference
The envelope of formation does not drift about as the temperature increases, illustrates that mode-interference has insensitive characteristic to temperature, from theory
Mode-interference has refractive index sensitivity characteristic known to upper analysis.But as the temperature increases, the spectrum of Sagnac interference occurs
Blue shift, and having temperature sensitivity is -1.58nm/ DEG C, has sensitivity characteristic to temperature.In conclusion two kinds of interference birefringences
Rate, the susceptibility of temperature are different, therefore, can be according to the drift demodulation refractive index and temperature of sensitive matrix and two kinds of interference medium wavelengths
Spend parameter.
On the one hand, the present invention prepares high birefringence micro-nano fiber 22 using high-birefringence polarisation-maintaining optical fiber fused biconical taper, has
The advantages of small in size, loss low, high refractive index sensitivity, the basis of the two-parameter measurement of refractive index and temperature is established；Together
When high birefringence micro-nano fiber be placed in be formed between second side two-port of three-dB coupler 21 by way of fused fiber splice and have
The Sagnac of high temperature sensitivity interferes, and makes simple, at low cost, repeated height；On the other hand, in Sagnac sensing unit ring
Structure is simple, is only made of one section of high birefringence micro-nano fiber both ends welding standard single-mode fiber, cascades without more structures, and institute
Some devices are all made of all -fiber coupled modes, and compact-sized stabilization, anti-electromagnetic interference capability are stronger, in environmental monitoring, power grid
Maintenance, biochemical sensitive etc. application value all with higher.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, not to
The limitation present invention, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should all include
Within protection scope of the present invention.
Claims (9)
1. a kind of bis- parameter fibre optical sensors of Sagnac based on high birefringence micro-nano fiber, which is characterized in that including broadband light
Source (1) and Saganc sensing unit (2)；
The input terminal of the Saganc sensing unit (2) receives wideband light source (1), the interference signal of output end output spectrum；
The wideband light source (1) is that Saganc sensing unit (2) provide light source；
The Saganc sensing unit (2) is classified as the opposite two-way light of transmission direction for receiving wideband light source (1)
Beam excites and screens optical transmission mode, and then obtains mode-interference and the Sagnac interference of the generation of two-way light beam, realizes to the external world
The monitoring of ambient refractive index, temperature change.
2. the bis- parameter fibre optical sensors of Sagnac as described in claim 1, which is characterized in that the Saganc sensing is single
First (2) include three-dB coupler (21) and high birefringence micro-nano fiber (22)；
The tapered structure of the high birefringence micro-nano fiber (22), the diameter at optical fiber both ends is bigger than the diameter of optical fiber waist location,
The order of magnitude of diameter is micron or nanometer, is connected between the first port and second port of second side of coupler (21),
Second side of coupler (21) forms the Sagnac ring (23) of closure；
The three-dB coupler (21) realizes Sagnac interference for receiving wideband light source and light splitting coupling；
The high birefringence micro-nano fiber (22) is excited clockwise and inverse along Sagnac ring (23) using nonadiabatic conical gradual change area
The two-beam of hour hands transmission generates multiple optical modes with different effective refractive indexs, and with high birefringence micro-nano fiber (22)
Along becoming smaller for waist orient diameter, high-order optical mode is ended, and obtains final optical transmission mode.
3. the bis- parameter fibre optical sensors of Sagnac as claimed in claim 2, which is characterized in that the three-dB coupler (21)
Two sides are respectively provided with there are two port, and the first port in the first side of three-dB coupler (21) is provided with light beam incidence end P1 and is used for
It receives wideband light source (1)；Second port in (21) first side of three-dB coupler is provided with beam exit end P2 output interference light
Spectrum；The first port of second side of three-dB coupler (21) is provided with the end P3, transmits first obtained from three-dB coupler (21)
Light beam, the first light beam is along Sagnac ring (23) clockwise transmission to the end P4；In the second port of second side of three-dB coupler (21)
It is provided with the end P4, transmits the second light beam obtained from three-dB coupler (21), the second light beam is along Sagnac ring (23) counterclockwise transmission
To the end P3, final two light beam mutually converges at three-dB coupler (21), exports from the end exit end P2.
4. the bis- parameter fibre optical sensors of Sagnac as claimed in claim 3, which is characterized in that the high birefringence micro-nano fiber
(22) it is made of high-birefringence polarisation-maintaining optical fiber fused biconical taper, inside has non-circular symmetrical refraction rate distribution character, and birefringent ginseng
Number B is greater than the birefringent parameter of most of single mode optical fiber, provides support to generate Sagnac interference.
5. the bis- parameter fibre optical sensors of Sagnac as claimed in claim 2 or 4, which is characterized in that the light filtered out passes
Defeated mode is HE11Mould, TE01Mould and TM01Mould.
6. the bis- parameter fibre optical sensors of Sagnac as claimed in claim 5, which is characterized in that the TE01Mould and TM01Between mould
Sagnac interference is generated there are mode-interference, between first light beam and the second light beam；
The mode-interference changes sensitivity to extraneous ambient refractive index, does not have sensibility to temperature；
The Sagnac interference has sensibility to temperature.
7. the bis- parameter fibre optical sensors of Sagnac as claimed in claim 6, which is characterized in that the TE01Mould and TM01Between mould
After carrying out mode-interference, normalized output luminous intensity T is indicated are as follows:
WhereinIt is TE01And TM01Between phase difference, λ is wavelength, Δ L=l (n1-n2) it is TE01And TM01It
Between optical path difference, by effective refractive index n1And n2And the length l of polarization maintaining optical fibre cone waist is determined.
8. the bis- parameter fibre optical sensors of Sagnac as claimed in claim 6, which is characterized in that first light beam and the second light
Beam generates Sagnac interference at three-dB coupler (21), and Sagnac interference spectrum indicates are as follows:
Wherein B indicates the birefringent of high birefringence micro-nano fiber (22), and L and λ are respectively the length of high birefringence micro-nano fiber (22)
Degree and operative wavelength.
9. the bis- parameter fibre optical sensors of Sagnac as described in claim 1, which is characterized in that the Saganc sensing unit
(2) output end connects spectrometer, and the spectrometer carries out Wavelength demodulation to the interference signal that Saganc sensing unit (2) transmits.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110687077A (en) * | 2019-11-20 | 2020-01-14 | 广东省海洋工程装备技术研究所 | Optical fiber probe and device for measuring sea ice thickness |
| CN110887525A (en) * | 2019-12-02 | 2020-03-17 | 中国人民解放军国防科技大学 | CTD sensing array based on micro-nano optical fiber coupler SAGNAC ring |
| CN112113588A (en) * | 2020-08-25 | 2020-12-22 | 山东科技大学 | Method for realizing high stability of output of Sagnac loop of micro-nano optical fiber by mode control of filter |
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| CN110687077A (en) * | 2019-11-20 | 2020-01-14 | 广东省海洋工程装备技术研究所 | Optical fiber probe and device for measuring sea ice thickness |
| CN110687077B (en) * | 2019-11-20 | 2022-07-29 | 广东省海洋工程装备技术研究所 | Optical fiber probe and device for measuring sea ice thickness |
| CN110887525A (en) * | 2019-12-02 | 2020-03-17 | 中国人民解放军国防科技大学 | CTD sensing array based on micro-nano optical fiber coupler SAGNAC ring |
| CN110887525B (en) * | 2019-12-02 | 2021-06-04 | 中国人民解放军国防科技大学 | CTD sensing array based on micro-nano optical fiber coupler SAGNAC ring |
| CN112113588A (en) * | 2020-08-25 | 2020-12-22 | 山东科技大学 | Method for realizing high stability of output of Sagnac loop of micro-nano optical fiber by mode control of filter |
| WO2022041970A1 (en) * | 2020-08-25 | 2022-03-03 | 山东科技大学 | Method for realizing high stability of micro-nano optical fiber sagnac loop output by means of filter mode control |
| US11624635B1 (en) | 2020-08-25 | 2023-04-11 | Shandong University Of Science And Technology | Method for realizing high stability of micro-nano optical fiber Sagnac loop output by means of filter mode control |
| CN113758600A (en) * | 2021-09-08 | 2021-12-07 | 燕山大学 | Sagnac temperature sensor based on nematic liquid crystal |
| CN113758600B (en) * | 2021-09-08 | 2022-06-10 | 燕山大学 | Sagnac temperature sensor based on nematic liquid crystal |
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