CN103148902A - Doped fiber bragg grating-based optical fiber flow sensor - Google Patents
Doped fiber bragg grating-based optical fiber flow sensor Download PDFInfo
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- CN103148902A CN103148902A CN 201310040905 CN201310040905A CN103148902A CN 103148902 A CN103148902 A CN 103148902A CN 201310040905 CN201310040905 CN 201310040905 CN 201310040905 A CN201310040905 A CN 201310040905A CN 103148902 A CN103148902 A CN 103148902A
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Abstract
The invention discloses a doped fiber bragg grating-based optical fiber flow sensor which comprises a temperature compensation section optical fiber and a flow measurement section optical fiber, wherein the flow measurement section optical fiber is a doped optical fiber, a fiber bragg grating A is written in a fiber core of the flow measurement section optical fiber, the temperature compensation section optical fiber is a common single-mode optical fiber, and a fiber bragg grating B is written in a fiber core of the temperature compensation section optical fiber. The flow measurement section optical fiber is pumped by using a pumping laser, the temperature of the flow measurement section optical fiber and the wavelength of the fiber bragg grating A change with the wind speed, the flow measurement section optical fiber can be used as a broadband light source, and thus the structure of the sensor is simplified. By combining a fiber bragg grating technology and a hot line type flow sensing technology, the doped fiber bragg grating-based optical fiber flow sensor realizes synchronous measurement of temperature and flow, and has the advantages of simplicity in manufacture, small size, high sensitivity, lower cost and the like.
Description
Technical field
The present invention relates to a kind of fiber optic sensing device, be specifically related to a kind of Hot Wire Type Flow Sensor spare based on the doped fiber grating.
Background technology
The measurement of flow velocity, flow in the industrial processes such as oil, chemical industry, medicine, energy measurement, environmental monitoring in occupation of very important status.Therefore, flow velocity, flow sensor are indispensable senser elements in fluid detection and control procedure.Traditional mechanical type flow velocity, the flow sensor measuring error is large, precision is low.For example, adopt the current meter of hyperacoustic Flow speed measurer, electromagnetic current meter or acoustical Doppler effect etc., although measuring accuracy is higher, the high and easy electromagnetic wave interference of its cost.Along with the development of optical fiber technology, a lot of flow velocity of optical, flow sensors based on optical principle have appearred.
In recent years, optic flow sensor enjoys people's extensive concern because of its unique advantage.Optic flow sensor is the principle realization of adopting light transmit the time in optical fiber the characteristic (as intensity, phase place, frequency, wavelength etc.) can be subjected to the modulation of flow and corresponding modulation voltage being demodulated into rate of flow of fluid.Compare with traditional flow sensor, optic flow sensor has following advantage: (1) accuracy, highly sensitive; (2) high pressure resistant, high temperature resistant, anti-electromagnetic interference (EMI), safe and reliable under inflammable, explosive environments; (3) bandwidth, dynamic range are wide; (4) be convenient to telemeasurement and control; (5) volume is little, quality is light.Owing to having anti-electromagnetic interference (EMI), anti-neighbourhood noise, the characteristics such as electric insulating quality and self-security, so optic flow sensor will have huge marketable value.
Traditional flow sensor based on optical fiber mainly contains optical fiber low discharge sensor, optical fiber doppler flowmeter, optical fiber turbine flow transducer, optical fiber vortex flow sensors etc.
The low discharge optic flow sensor is based on Fresnel drageffect measuring flow, has realized the measurement of specific area fluid low discharge.Yet, a little less than fluid flow less makes transducing signal, be unfavorable for the detection of signal, reduced the accuracy of measuring.Now, sensors with auxiliary electrode were only satisfies the needs of oil, well flow measurement, is difficult to be widely used in the measurement of fluid.
The Doppler effect that the optical fiber doppler flowmeter is based on light is determined the flowing velocity of fluid, can realize that the contactless high-precision of speed of moving body is measured.The optical fiber doppler flowmeter can be advantageously applied to places such as solving Large Diameter Pipeline, thick tube wall, cement lining.But in fluid, molecule or bubble are random the existence, thereby have affected its measuring accuracy.
The optical fiber turbine flow transducer is on the basis of conventional turbine flow measurement principle, adopts multimode optical fiber to replace the internal magnetization sensor and the reflection-type optical fiber turbine flow transducer that consists of.The advantages such as it has linearity, good reproducibility, anti-electromagnetic interference capability is strong, the measurement dynamic range is large.But its application is confined to that the scene is not charged, the test of low-viscosity oil gas flow.
The optical fiber vortex flow sensors is a kind of vortex flow sensors of eddy current that produces as non-linear type fluid with optical fiber.Utilize the release frequency of vortex to be directly proportional to flow velocity, obtain fluid flow thereby just can measure frequency.Because optical fiber is in fluid for a long time, so optical fiber may produce the phenomenons such as fracture, wearing and tearing.
At present, Fiber Bragg Grating technology development is very rapid, also emerges in an endless stream based on the sensor of the physical quantitys such as the temperature of fiber grating, pressure, vibration, humidity.Aspect measurement of fluid flow, the target type fiber grating flowmeter combines single or multiple fiber gratings, semi-girder and target formula disk, has improved many reference amounts, security and the accuracy of systematic survey, uses very extensive.The basic functional principle of this class sensor is used on target formula disk for the masterpiece when Fluid Flow in A generation and when transferring on cantilever by transmission rod, the torsional deformation of suspended wall will cause fiber grating deformation, the wave length shift that causes fiber grating, thus the flow value that will measure can be obtained by the variable quantity of measuring wavelength.But this sensor construction is comparatively complicated, and measurement result and semi-girder parameter are closely related, and are difficult to the formulation of the standard that realizes.
In research in sum, existing optic flow sensor respectively has characteristics on performance and method for making, but all has separately shortcoming, embodies a concentrated reflection of the sensing arrangement relative complex, volume is large, serviceable life is partially short, low to reach price high for measuring accuracy.Based on the wide application of optical fibre flowmeter and to the active demand of novel optical fiber flow sensor.
Summary of the invention
For existing fiber flow sensor complex process, serviceable life is short, volume is large, the problem such as expensive, the object of the present invention is to provide a kind of Hot Wire Type Flow Sensor spare based on fiber grating.
The technical solution used in the present invention is:
Comprise temperature compensation section optical fiber and flow measuring section optical fiber; Flow measuring section optical fiber is doped fiber, has write fiber grating A in its fibre core, and temperature compensation section optical fiber is general single mode fiber, its fibre core Fiber Bragg Grating B; Utilize pump laser pumping flow measuring section optical fiber, the wavelength of its temperature and fiber grating A changes with wind speed, and this section optical fiber can be used as wideband light source simultaneously, has so just simplified the structure of sensor.
The beneficial effect that the present invention has is:
The present invention combines Fiber Bragg Grating technology with hot-wire flow sensing technology, realized the real-time measurement of the two parameters of temperature and flow, has and makes the advantages such as simple, that volume is little, highly sensitive, cost is lower, can be used for the measurement of small gas flow.
Description of drawings
Fig. 1 is based on the structural representation of the Hot Wire Type Flow Sensor spare of doped fiber grating.
Fig. 2 is a kind of pick-up unit figure of the Hot Wire Type Flow Sensor spare based on the doped fiber grating.
Fig. 3 is that another kind is based on the pick-up unit figure of the Hot Wire Type Flow Sensor spare of doped fiber grating.
In figure: 1, doped fiber, 2, single-mode fiber, 3, fiber grating A, 4, fiber grating B, 5, the Wavelength demodulation module, 6, wavelength division multiplexer, 7, pump laser, 8, hot-wire flow sensing unit.
Embodiment
The invention will be further described below in conjunction with the drawings and specific embodiments.
As shown in Figure 1, comprise doped fiber (1) and single-mode fiber (2); The fibre core Fiber Bragg Grating A (3) of doped fiber (1) is as the flow measuring section of sensing unit; Single-mode fiber (2) fibre core Fiber Bragg Grating B (4), as the temperature compensation section of sensing unit, doped fiber (1) to the core welding, forms the sensing unit of sensor with single-mode fiber (2).
Basic functional principle based on the novel Hot Wire Type Flow Sensor spare of doped fiber grating: as shown in Figure 1, on the one hand, laser is injected by the free end of flow measuring section optical fiber, absorb the laser of specific wavelength due to doped fiber, absorb the optical fiber of laser energy with releases heat, forced corresponding grating region to form specific temperature field.On the other hand, amplified spont-aneous emission output broadband optical signal occurs in doped fiber under the pumping of the pump light source of specific wavelength, played the effect of wideband light source.The light signal of doped fiber output can form reflectance spectrum when running into fiber grating A, can detect temperature field corresponding to fiber grating by Wavelength demodulation.Therefore, when senser element as for fluid in the time, but utilize Wavelength demodulation technology Real-time Measuring to measure corresponding temperature, thereby further calculate the flow of fluid.Obviously, rate of flow of fluid is larger, and the heat of taking away is just larger, and the temperature of grating region is just lower, and temperature becomes negative linear relationship with fluid flow.Simultaneously, the fiber grating B in temperature compensation section optical fiber is not subjected to the impact of doped fiber release heat, so the Measurement accuracy of current environmental temperature is provided.
As shown in Figure 1, wherein: doped fiber is the optical fiber that is mixed with the high concentration erbium ion, and length is 4cm, and Fiber Bragg Grating A is 1cm, and fiber grating A is from welding end 35mm, and centre wavelength is 1550nm, and reflectivity is 13dB; Single-mode fiber 2 length are 4cm, and Fiber Bragg Grating B is 4mm, and Fiber Bragg Grating B is from welding end 1mm, and centre wavelength is 1560nm, and reflectivity is 25dB; Wavelength demodulation module 5 is AQ8683; Wavelength division multiplexer 6 is 980/1550nm high power wavelength division multiplexer; Laser instrument 7 is the continuous Raman fiber laser, and centre wavelength is 980nm, and power 0-1W is adjustable.
Pick-up unit based on the novel Hot Wire Type Flow Sensor spare of fiber grating has many structures, and the below enumerates two kinds of detection architecture, but is not limited only to this.
As shown in Figure 2, adopt the first structure, laser instrument 7 connects the Com port of wavelength division multiplexer 6 after via flow sensing unit 8, and the 1550nm port of wavelength division multiplexer 6 connects Wavelength demodulation module 5.
As shown in Figure 3, adopt the second structure, flow sensing unit 8 connects the Com end of wavelength division multiplexer 6, and the 980nm port of wavelength division multiplexer 6 and 1550nm port connect respectively laser instrument 7, Wavelength demodulation module 5.
Claims (3)
1. the optic flow sensor based on the doped fiber grating, comprise the doped fiber of having inscribed fiber grating A, the single-mode fiber of having inscribed fiber grating B, Wavelength demodulation module, wavelength division multiplexer and pump laser.It is characterized in that: doped fiber and single-mode fiber are to the core welding, and as the sensing unit of sensor, wavelength division multiplexer is connected with pump laser sensing unit with the Wavelength demodulation module.
2. pump laser as claimed in claim 1, it is characterized in that: its laser center wavelength can be doped optical fiber and absorb on the absorption band of doped fiber.
3. doped fiber as claimed in claim 1, it is characterized in that: can absorb the pumping laser of specific wavelength, the evolution of heat also produces amplified spont-aneous emission light.
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103759776A (en) * | 2014-01-24 | 2014-04-30 | 华南师范大学 | All-optical gas mass flow rate monitoring device and method |
| CN103791957A (en) * | 2014-03-03 | 2014-05-14 | 中国计量学院 | Fiber flow sensor based on metal-film-coated and long-period fiber bragg gratings |
| CN105157769A (en) * | 2015-04-30 | 2015-12-16 | 黑龙江大学 | Thermal flow sensor gas flow metering method based on fiber grating |
| CN105953940A (en) * | 2016-04-21 | 2016-09-21 | 北京卫星环境工程研究所 | Temperature, humidity and wind speed integrated sensing system of fiber grating |
| CN107179421A (en) * | 2017-06-29 | 2017-09-19 | 山东省科学院激光研究所 | Flow sensor is popped one's head in and flow velocity measuring system |
| CN108414036A (en) * | 2018-03-19 | 2018-08-17 | 山东省科学院激光研究所 | A kind of quasi-distributed flow rate monitoring system |
| CN109441434A (en) * | 2018-12-19 | 2019-03-08 | 常州艾控智能仪表有限公司 | Multi-parameter measuring systems under photoelectricity combined shaft |
| CN110579249A (en) * | 2019-09-17 | 2019-12-17 | 西北大学 | Co-doped multimode fiber bragg grating based hot-wire flow sensor and manufacturing method thereof |
| CN111964740A (en) * | 2020-08-14 | 2020-11-20 | 西北大学 | Thermal fiber grating flow sensor for production logging and manufacturing method |
| CN113532536A (en) * | 2021-07-22 | 2021-10-22 | 北京奥特美克科技股份有限公司 | Optical fiber sensor and manufacturing method thereof |
| CN113607219A (en) * | 2021-08-12 | 2021-11-05 | 北京奥特美克科技股份有限公司 | Multi-parameter monitoring system of long-distance pipe network and state prediction method and device thereof |
| CN114414838A (en) * | 2021-12-20 | 2022-04-29 | 山东微感光电子有限公司 | Wind speed measurement system and method based on VCSEL wavelength demodulation and pulse light source heating |
| CN116754104A (en) * | 2023-08-14 | 2023-09-15 | 山东省科学院激光研究所 | Fiber bragg grating laser thermal field sensor and application method thereof |
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2013
- 2013-01-29 CN CN 201310040905 patent/CN103148902A/en active Pending
Cited By (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103759776B (en) * | 2014-01-24 | 2017-02-08 | 华南师范大学 | All-optical gas mass flow rate monitoring device and method |
| CN103759776A (en) * | 2014-01-24 | 2014-04-30 | 华南师范大学 | All-optical gas mass flow rate monitoring device and method |
| CN103791957A (en) * | 2014-03-03 | 2014-05-14 | 中国计量学院 | Fiber flow sensor based on metal-film-coated and long-period fiber bragg gratings |
| CN105157769A (en) * | 2015-04-30 | 2015-12-16 | 黑龙江大学 | Thermal flow sensor gas flow metering method based on fiber grating |
| CN105157769B (en) * | 2015-04-30 | 2018-02-13 | 黑龙江大学 | The gas flow metering method of thermal flow rate sensor based on fiber grating |
| CN105953940B (en) * | 2016-04-21 | 2018-03-30 | 北京卫星环境工程研究所 | Temperature, humidity and the wind speed integration composite sensing system of fiber grating |
| CN105953940A (en) * | 2016-04-21 | 2016-09-21 | 北京卫星环境工程研究所 | Temperature, humidity and wind speed integrated sensing system of fiber grating |
| CN107179421B (en) * | 2017-06-29 | 2019-08-23 | 山东省科学院激光研究所 | Flow sensor probe and flow velocity measuring system |
| CN107179421A (en) * | 2017-06-29 | 2017-09-19 | 山东省科学院激光研究所 | Flow sensor is popped one's head in and flow velocity measuring system |
| CN108414036A (en) * | 2018-03-19 | 2018-08-17 | 山东省科学院激光研究所 | A kind of quasi-distributed flow rate monitoring system |
| CN109441434A (en) * | 2018-12-19 | 2019-03-08 | 常州艾控智能仪表有限公司 | Multi-parameter measuring systems under photoelectricity combined shaft |
| CN110579249A (en) * | 2019-09-17 | 2019-12-17 | 西北大学 | Co-doped multimode fiber bragg grating based hot-wire flow sensor and manufacturing method thereof |
| CN110579249B (en) * | 2019-09-17 | 2021-06-29 | 西北大学 | Hot-wire flow sensor based on cobalt-doped multimode fiber bragg grating and manufacturing method |
| CN111964740A (en) * | 2020-08-14 | 2020-11-20 | 西北大学 | Thermal fiber grating flow sensor for production logging and manufacturing method |
| CN111964740B (en) * | 2020-08-14 | 2023-09-22 | 西北大学 | Thermal fiber bragg grating flow sensor for production logging and manufacturing method |
| CN113532536A (en) * | 2021-07-22 | 2021-10-22 | 北京奥特美克科技股份有限公司 | Optical fiber sensor and manufacturing method thereof |
| CN113607219A (en) * | 2021-08-12 | 2021-11-05 | 北京奥特美克科技股份有限公司 | Multi-parameter monitoring system of long-distance pipe network and state prediction method and device thereof |
| CN114414838A (en) * | 2021-12-20 | 2022-04-29 | 山东微感光电子有限公司 | Wind speed measurement system and method based on VCSEL wavelength demodulation and pulse light source heating |
| CN116754104A (en) * | 2023-08-14 | 2023-09-15 | 山东省科学院激光研究所 | Fiber bragg grating laser thermal field sensor and application method thereof |
| CN116754104B (en) * | 2023-08-14 | 2023-11-03 | 山东省科学院激光研究所 | Fiber bragg grating laser thermal field sensor and application method thereof |
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Application publication date: 20130612 |