CN104330101A - Optical fiber sensor capable of measuring temperatures and micrometric displacement simultaneously - Google Patents
Optical fiber sensor capable of measuring temperatures and micrometric displacement simultaneously Download PDFInfo
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- CN104330101A CN104330101A CN201410581300.3A CN201410581300A CN104330101A CN 104330101 A CN104330101 A CN 104330101A CN 201410581300 A CN201410581300 A CN 201410581300A CN 104330101 A CN104330101 A CN 104330101A
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Abstract
The invention discloses an optical fiber sensor capable of measuring temperatures and micrometric displacement simultaneously. The optical fiber sensor is composed of a fiber Bragg grating, a peanut cone structure a and a peanut cone structure b, all of which are welded in series with each other; the incident end of the fiber Bragg grating is connected with a broadband light source by use of a single-mode optical fiber; the diameter of the fiber core of the single-mode optical fiber is 8.3 microns and the diameter of the wrapping layer of the single-mode optical fiber is 125 microns; the central wavelength of the fiber Bragg grating under the condition of a room temperature is 1549.71nm; the length of the single-mode optical fiber between the peanut cone structure a and the peanut cone structure b is 3.5cm; the output end of an eccentric core structure is connected with a spectrum analyzer by use of the single-mode optical fiber. The optical fiber sensor capable of measuring the temperatures and the micrometric displacement simultaneously is simple in structure and easy to manufacture, and the output signal of the sensor comprises interference peaks and the transmission peaks of the FBG, and according to the sensitivity difference between the interference peaks and the transmission peaks of the FBG to the temperatures and the micrometric displacement, the simultaneous measurement of the temperatures and the micrometric displacement can be realized; the sensor is low in cost, stable in structure and high in measurement accuracy, and has potential application value in the aspects of security and protection, buildings and energy sources.
Description
Technical field
The invention belongs to technical field of optical fiber sensing, particularly relate to a kind of can the Fibre Optical Sensor of simultaneously measuring tempeature and micrometric displacement.
Background technology
Fiber optic sensor technology is a kind of brand-new sensing technology occurred along with light transmitting fiber and optical fiber communication technology development.Practical along with Fibre Optical Communication Technology, Fibre Optical Sensor has had and has developed rapidly, and has the features such as volume is little, lightweight, resolution is high, highly sensitive, anti-electromagnetic interference capability is strong, corrosion resistivity is strong, is obviously better than traditional sensors.Various types of sensor is widely used in every field already, as commercial production, health care, defence engineering etc.
In recent years, various types of sensor has the development of advancing by leaps and bounds.Wherein interferometric sensor with its make simple, sensitivity high development ground is particularly rapid, occurred many new constructions as core shift, draw cone, and fiber grating cascade etc.Utilize the characteristic of interference and fiber grating between different mode different to the sensitivity of measuring amount, the sensitive problem of intersection in sensing measurement can be eliminated, thus the even many reference amounts measurement of two parameter can be accomplished.
Summary of the invention
The object of the invention is for above-mentioned technical Analysis, there is provided a kind of can the Fibre Optical Sensor of simultaneously measuring tempeature and micrometric displacement, optical fiber Bragg (FBG) transmission peaks and interference peaks is there is in this Fibre Optical Sensor output signal, according to its different susceptibility to temperature and micrometric displacement, temperature and the two parameter of micrometric displacement can be realized and to measure and to eliminate intersection sensitive simultaneously.
Technical scheme of the present invention:
A kind of can the Fibre Optical Sensor of simultaneously measuring tempeature and micrometric displacement, be made up of Fiber Bragg Grating FBG, peanut wimble structure a and peanut wimble structure b series welding, the incidence end of Fiber Bragg Grating FBG (FBG) is connected with wideband light source by single-mode fiber, single-mode fiber core diameter is 8.3 μm, cladding diameter is 125 μm, Fiber Bragg Grating FBG (FBG) writes system on single-mode fiber, and Fiber Bragg Grating FBG (FBG) centre wavelength is at ambient temperature 1549.71nm; Between peanut wimble structure a and peanut wimble structure b, the length of single-mode fiber is 3.5cm; The output terminal of core shift structure is connected with spectroanalysis instrument by single-mode fiber.
A kind of described can the application of the Fibre Optical Sensor of measuring tempeature and micrometric displacement simultaneously, measure while the Fibre Optical Sensor using Mach to increase Dare (MZ) interference structure cascaded optical fiber Bragg grating carries out temperature and micrometric displacement, optic path when this Fibre Optical Sensor carries out sensing to temperature and micrometric displacement is at the same time: the light of wideband light source is incident from single-mode fiber, the light reflection of Bragg condition is met, remaining Transmission light when Fiber Bragg Grating FBG (FBG); Formed through two peanut wimble structure emergence pattern couplings successively afterwards and interfere, these patterns transfer in spectroanalysis instrument by single-mode fiber, the change of monitoring of environmental temperature and micrometric displacement, and step is as follows:
1) the output signal spectrogram of Fibre Optical Sensor is drawn, as the transmission peaks dip of interference peaks dip1 and Fiber Bragg Grating FBG
fBGwhen there is wave length shift, obtain the changed wavelength of dip1 respectively
and dip
fBGchanged wavelength
;
2) by following formulae discovery variation of ambient temperature amount
with the variable quantity of refractive index
:
In formula,
,
be respectively the sensitivity coefficient of dip1 for temperature and micrometric displacement,
with
dip
fBGfor the sensitivity coefficient of temperature and micrometric displacement;
.
Advantage of the present invention and beneficial effect are:
This optical fibre sensor structure simply and easily make, the Fiber Bragg Grating FBG only needing common single-mode fiber and be scribed in single-mode fiber, in this sensor, output signal comprises the transmission peaks of interference peaks and FBG, according to its different susceptibility to temperature and micrometric displacement, can realize measuring while temperature and micrometric displacement; This sensor, cost is low, Stability Analysis of Structures, measuring accuracy are high, in security protection, building, the energy, have potential using value.
Accompanying drawing explanation
Fig. 1 is this optical fibre sensor structure schematic diagram.
In figure: 1. wideband light source, 2. Fiber Bragg Grating FBG, 3. peanut wimble structure a, 4. peanut wimble structure b, 5. spectroanalysis instrument.
Fig. 2 is the output signal spectrogram of this Fibre Optical Sensor.
Fig. 3 is micro-displacement sensing experimental provision structural representation.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail.
embodiment:
A kind of can the Fibre Optical Sensor of simultaneously measuring tempeature and micrometric displacement, as shown in Figure 1, be made up of Fiber Bragg Grating FBG 2, peanut wimble structure a3 and peanut wimble structure b4 series welding, the incidence end of Fiber Bragg Grating FBG (FBG) 2 is connected with wideband light source 1 by single-mode fiber, single-mode fiber core diameter is 8.3 μm, cladding diameter is 125 μm, Fiber Bragg Grating FBG (FBG) 2 writes system on single-mode fiber, and Fiber Bragg Grating FBG (FBG) 2 centre wavelength is at ambient temperature 1549.71nm; Between peanut wimble structure a3 and peanut wimble structure b4, the length of single-mode fiber is 3.5cm; The output terminal of peanut wimble structure b4 is connected with spectroanalysis instrument 5 by single-mode fiber.
A kind of described can the application of the Fibre Optical Sensor of measuring tempeature and micrometric displacement simultaneously, measure while the Fibre Optical Sensor using Mach to increase Dare (MZ) interference structure cascaded optical fiber Bragg grating carries out temperature and micrometric displacement, optic path when this Fibre Optical Sensor carries out sensing to temperature and micrometric displacement is at the same time: the light of wideband light source is incident from single-mode fiber, the light reflection of Bragg condition is met, remaining Transmission light when Fiber Bragg Grating FBG (FBG); Formed through two peanut wimble structure emergence pattern couplings successively afterwards and interfere, these patterns transfer in spectroanalysis instrument by single-mode fiber, the change of monitoring of environmental temperature and micrometric displacement, and step is as follows:
1) the output signal spectrogram of Fibre Optical Sensor is drawn, as the transmission peaks dip of interference peaks dip1 and Fiber Bragg Grating FBG
fBGwhen there is wave length shift, obtain the changed wavelength of dip1 respectively
and dip
fBGchanged wavelength
;
2) by following formulae discovery variation of ambient temperature amount
with the variable quantity of refractive index
:
In formula,
,
be respectively the sensitivity coefficient of dip1 for temperature and micrometric displacement,
with
dip
fBGfor the sensitivity coefficient of temperature and micrometric displacement;
.
Measuring process is specially:
1) first measure by described sensor for temperature, be fixed on temperature-constant plate by the sensor made, arranging temperature-constant plate range of temperature is 20 DEG C-75 DEG C, every 5 DEG C of record one secondary data, obtains
it is 0.0909 He
be 0.0121.
2) micro-displacement sensing experimental provision (commercially available prod) is then utilized to measure micrometric displacement:
Micro-displacement measuring device is metal material, and fixed arm and moveable arm are two identical sheet metals of shape, and rotating shaft is equivalent to balance pivot, and common composition " scissors " shape measures structure, as shown in Figure 3.Sensing arrangement two ends epoxy resin is pasted on long-armed two ends up and down, and keeps its straight condition; Micrometer caliper is fixed on the two ends up and down of galianconism, and observation transmission spectrum, the output signal spectrogram of this Fibre Optical Sensor is as shown in Fig. 2.By adjustable screw mircrometer gauge, change the distance between galianconism thus micrometric displacement is measured, obtaining
for-0.0233 and
be 0.0122.
Sensitive matrix is obtained according to above measurement.
In actual applications, the change by using sensitive matrix and measured wavelength variations can obtain temperature and micrometric displacement:
Wherein
=0.00139.
Can obtain after bringing surveyed data into
。
Claims (2)
1. one kind can the Fibre Optical Sensor of simultaneously measuring tempeature and micrometric displacement, it is characterized in that: be made up of Fiber Bragg Grating FBG, peanut wimble structure a and peanut wimble structure b series welding, the incidence end of Fiber Bragg Grating FBG (FBG) is connected with wideband light source by single-mode fiber, single-mode fiber core diameter is 8.3 μm, cladding diameter is 125 μm, Fiber Bragg Grating FBG (FBG) writes system on single-mode fiber, and Fiber Bragg Grating FBG (FBG) centre wavelength is at ambient temperature 1549.71nm; Between peanut wimble structure a and peanut wimble structure b, the length of single-mode fiber is 3.5cm; The output terminal of core shift structure is connected with spectroanalysis instrument by single-mode fiber.
2. one kind as claimed in claim 1 can the Fibre Optical Sensor of simultaneously measuring tempeature and micrometric displacement, it is characterized in that: described can the application of the simultaneously Fibre Optical Sensor of measuring tempeature and micrometric displacement, measure while the Fibre Optical Sensor using Mach to increase Dare (MZ) interference structure cascaded optical fiber Bragg grating carries out temperature and micrometric displacement, optic path when this Fibre Optical Sensor carries out sensing to temperature and micrometric displacement is at the same time: the light of wideband light source is incident from single-mode fiber, the light reflection of Bragg condition is met when Fiber Bragg Grating FBG (FBG), remaining Transmission light, formed through two peanut wimble structure emergence pattern couplings successively afterwards and interfere, these patterns transfer in spectroanalysis instrument by single-mode fiber, the change of monitoring of environmental temperature and micrometric displacement, and step is as follows:
1) the output signal spectrogram of Fibre Optical Sensor is drawn, as the transmission peaks dip of interference peaks dip1 and Fiber Bragg Grating FBG
fBGwhen there is wave length shift, obtain the changed wavelength of dip1 respectively
and dip
fBGchanged wavelength
;
2) by following formulae discovery variation of ambient temperature amount
with the variable quantity of refractive index
:
In formula,
,
be respectively the sensitivity coefficient of dip1 for temperature and micrometric displacement,
with
dip
fBGfor the sensitivity coefficient of temperature and micrometric displacement;
.
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| CN201410581300.3A CN104330101A (en) | 2014-10-28 | 2014-10-28 | Optical fiber sensor capable of measuring temperatures and micrometric displacement simultaneously |
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| CN106197548A (en) * | 2016-08-04 | 2016-12-07 | 天津理工大学 | A kind of based on wimble structure with the fibre optic magnetic field sensor of Semen arachidis hypogaeae wimble structure cascaded optical fiber Bragg grating |
| CN107063499A (en) * | 2017-04-19 | 2017-08-18 | 天津理工大学 | A kind of double parameter fibre optical sensors and preparation method based on less fundamental mode optical fibre wimble structure |
| CN107621447A (en) * | 2017-11-06 | 2018-01-23 | 中国计量大学 | A kind of optical fiber hypersensor of measurable liquid quality and humidity |
| CN107748018A (en) * | 2017-09-27 | 2018-03-02 | 西北大学 | Fiber Bragg Grating temperature bend sensor based on Mach Zehnder interferometry |
| CN108195485A (en) * | 2017-12-29 | 2018-06-22 | 北京信息科技大学 | Temperature and the biparameter sensor of strain and preparation method thereof are measured based on LPFG and MZ cascades |
| CN109099947A (en) * | 2018-06-25 | 2018-12-28 | 武汉理工大学 | A kind of sensitizing type fiber grating micro-displacement sensor and method for sensing |
| CN109211302A (en) * | 2018-09-29 | 2019-01-15 | 北京菲斯罗克光电技术有限公司 | Calibration device, calibration system and the scaling method of naked FBG strain transducer |
| RU187697U1 (en) * | 2018-12-14 | 2019-03-14 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Санкт-Петербургский государственный университет" (СПбГУ) | Polariton device for measuring the temperature gradient |
| CN109781300A (en) * | 2018-12-30 | 2019-05-21 | 北京信息科技大学 | It is a kind of based on optical fiber while measure temperature and curvature device and method |
| CN110501091A (en) * | 2019-08-12 | 2019-11-26 | 北京航空航天大学 | A kind of temperature sensor based on graphene film modification biconial micro-nano fiber coupler |
| CN112050966A (en) * | 2019-06-06 | 2020-12-08 | 武汉工程大学 | Optical fiber sensor based on hybrid cascade structure and preparation method |
| CN113156573A (en) * | 2021-03-29 | 2021-07-23 | 江苏大学 | Orthogonal long-period fiber grating and application thereof in sensing bending |
| CN113156572A (en) * | 2021-03-29 | 2021-07-23 | 江苏大学 | Double-sided W-shaped long-period fiber grating and application thereof in sensing strain and temperature |
| CN117367512A (en) * | 2023-11-10 | 2024-01-09 | 南京信息工程大学 | Novel temperature and pressure optical fiber sensor based on MZ interference and F-P interference, preparation method thereof and sensitivity measurement method |
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2014
- 2014-10-28 CN CN201410581300.3A patent/CN104330101A/en active Pending
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| CN106197548A (en) * | 2016-08-04 | 2016-12-07 | 天津理工大学 | A kind of based on wimble structure with the fibre optic magnetic field sensor of Semen arachidis hypogaeae wimble structure cascaded optical fiber Bragg grating |
| CN107063499A (en) * | 2017-04-19 | 2017-08-18 | 天津理工大学 | A kind of double parameter fibre optical sensors and preparation method based on less fundamental mode optical fibre wimble structure |
| CN107748018A (en) * | 2017-09-27 | 2018-03-02 | 西北大学 | Fiber Bragg Grating temperature bend sensor based on Mach Zehnder interferometry |
| CN107621447A (en) * | 2017-11-06 | 2018-01-23 | 中国计量大学 | A kind of optical fiber hypersensor of measurable liquid quality and humidity |
| CN107621447B (en) * | 2017-11-06 | 2023-10-13 | 中国计量大学 | Optical fiber ultrasensitive sensor capable of measuring liquid quality and humidity |
| CN108195485A (en) * | 2017-12-29 | 2018-06-22 | 北京信息科技大学 | Temperature and the biparameter sensor of strain and preparation method thereof are measured based on LPFG and MZ cascades |
| CN109099947B (en) * | 2018-06-25 | 2020-12-22 | 武汉理工大学 | Sensitization type fiber bragg grating micro-displacement sensor and sensing method |
| CN109099947A (en) * | 2018-06-25 | 2018-12-28 | 武汉理工大学 | A kind of sensitizing type fiber grating micro-displacement sensor and method for sensing |
| CN109211302A (en) * | 2018-09-29 | 2019-01-15 | 北京菲斯罗克光电技术有限公司 | Calibration device, calibration system and the scaling method of naked FBG strain transducer |
| CN109211302B (en) * | 2018-09-29 | 2024-03-19 | 株洲菲斯罗克光电科技股份有限公司 | Calibration method of calibration system of bare FBG strain sensor |
| RU187697U1 (en) * | 2018-12-14 | 2019-03-14 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Санкт-Петербургский государственный университет" (СПбГУ) | Polariton device for measuring the temperature gradient |
| CN109781300A (en) * | 2018-12-30 | 2019-05-21 | 北京信息科技大学 | It is a kind of based on optical fiber while measure temperature and curvature device and method |
| CN112050966A (en) * | 2019-06-06 | 2020-12-08 | 武汉工程大学 | Optical fiber sensor based on hybrid cascade structure and preparation method |
| CN110501091B (en) * | 2019-08-12 | 2021-01-05 | 北京航空航天大学 | Temperature sensor based on graphene film modified biconical micro-nano optical fiber coupler |
| CN110501091A (en) * | 2019-08-12 | 2019-11-26 | 北京航空航天大学 | A kind of temperature sensor based on graphene film modification biconial micro-nano fiber coupler |
| CN113156573A (en) * | 2021-03-29 | 2021-07-23 | 江苏大学 | Orthogonal long-period fiber grating and application thereof in sensing bending |
| CN113156572A (en) * | 2021-03-29 | 2021-07-23 | 江苏大学 | Double-sided W-shaped long-period fiber grating and application thereof in sensing strain and temperature |
| CN117367512A (en) * | 2023-11-10 | 2024-01-09 | 南京信息工程大学 | Novel temperature and pressure optical fiber sensor based on MZ interference and F-P interference, preparation method thereof and sensitivity measurement method |
| CN117367512B (en) * | 2023-11-10 | 2024-05-14 | 南京信息工程大学 | Sensitivity measuring method of temperature and pressure optical fiber sensor |
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