CN207556708U - A kind of optical-fiber type temperature-sensing system and temperature sensing optical fiber - Google Patents
A kind of optical-fiber type temperature-sensing system and temperature sensing optical fiber Download PDFInfo
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- CN207556708U CN207556708U CN201720793929.3U CN201720793929U CN207556708U CN 207556708 U CN207556708 U CN 207556708U CN 201720793929 U CN201720793929 U CN 201720793929U CN 207556708 U CN207556708 U CN 207556708U
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Abstract
The utility model discloses a kind of optical-fiber type temperature-sensing system and temperature sensing optical fibers.The system comprises laser light source, wavelength division multiplexer, avalanche diode, data acquisition device, host computer and the temperature sensing optical fibers.The optical fiber includes sandwich layer, covering and coating successively from inside to outside；The core radius is 23.75~26.25 μm, and core refractive rate section is gradation type index distribution, and profile exponent α is 1.80~1.89, and sandwich layer relative index of refraction difference △ 1% is 0.9%~1.15%, and splice loss, splice attenuation is less than or equal to 0.08dB.Fiber temperature sensing system provided by the utility model, simple in structure, signal-to-noise ratio is high, as a result accurately.Temperature sensing optical fiber thermometric spatial resolution provided by the utility model is strong, temperature measurement accuracy is high, distance.
Description
Technical field
The utility model belongs to thermometric multimode fibre field, more particularly, to a kind of optical-fiber type temperature-sensing system and
Temperature sensing optical fiber.
Background technology
The measurement and control of temperature all occupy extremely important status in fields such as space flight, material, the energy, metallurgy.Distribution
Formula optical fiber temperature-measurement is emerging contact temperature-measuring technology at present, uses sensing and signal transmission of the optical fiber as temperature information
Carrier, have continuous temperature measurement, distributed temperature measuring, real time temperature measurement, electromagnetism interference, intrinsic safety, remote monitoring, high sensitivity,
The features such as simple installation, long-life, is widely used in the industries such as pipeline, tunnel, cable, petroleum and petrochemical industry, coal mine.
Optical-fiber type temperature-sensing system takes Raman scattering principle and optical time domain reflection technology set by acquiring in optical fiber
Anti-Stokes light in backward spontaneous Raman scattering with temperature information is as signal path, while the stokes light acquired
Or Rayleigh scattering light channel as a comparison, the temperature along optical fiber is restored by data processing after opto-electronic conversion and analog-to-digital conversion
Field distribution.The critical performance parameters of distributed optical fiber temperature sensing system include temperature resolution, and spatial resolution, thermometric is long
Degree, single measurement time etc..Spatial resolution is an important indicator in distributed optical fiber temperature sensing system, it refers to light
The minimum temperature-sensitive length of fine temperature-sensing system optical fiber, can specifically be expressed as：Become when a certain section of temperature-measuring optical fiber is in temperature jump
During change, the temperature response curve of temperature-measuring optical fiber response distance corresponding when rising to 90% by 10%.
Existing optical-fiber type temperature-sensing system, sensor fibre generally use is communication multimode fibre.Multimode light
Fibre has big mode field area and high Raman gain coefficienct, and the temperature for being easy to obtain by spontaneous Raman scattering along optical fiber is believed
Breath.But the disadvantage of communication multimode fibre is that the loss of optical fiber is larger, to obtain higher spatial resolution, often uses
It selects conductibility more preferably operation wavelength and parameter optimization, such as Chinese patent text is carried out to multimode fibre for the operation wavelength
Offer the sensor fibre mentioned in CN102539015A.
However, it is often more important that due to the arteries and veins for the laser light source that multimode fibre intermode dispersion (mode differential group delay) introduces
Punching broadening leads to the spatial resolution deficiency of more long-distance sensing, this is in the case where needing the temperature survey scene of higher spatial resolution
The distance sensing of optical fiber is actually limited, leads to thermometric curtailment.
Utility model content
For the disadvantages described above or Improvement requirement of the prior art, the utility model provides a kind of optical-fiber type temperature sensing system
System and temperature sensing optical fiber, its object is to by realizing that service band, anti-Stokes Raman dissipate to the selection of optical fiber parameter
It penetrates light (1450nm) and Stokes Raman scattering light (1660nm) light decay is substantially reduced, thus solve prior art optical-fiber type
The technical issues of temperature-sensing system distance sensing is limited, thermometric curtailment.
To achieve the above object, according to a scheme of the utility model, a kind of optical-fiber type temperature-sensing system is provided,
Including laser light source, wavelength division multiplexer, avalanche diode, data acquisition device, host computer and temperature sensing optical fiber；
The laser that the laser light source is sent out is connected by wavelength division multiplexer with the temperature sensing optical fiber；
The wavelength division multiplexer connect for receiving the temperature sensing optical fiber signal with avalanche diode；
The avalanche diode connect for converting optical signal into current signal with data acquisition device；
The data acquisition device is connected with host computer；
The host computer receives the data of data acquisition device acquisition；
The temperature sensing optical fiber is multimode fibre, includes sandwich layer, covering and coating successively from inside to outside；The sandwich layer half
Diameter is 23.75~26.25 μm, and core refractive rate section is gradation type index distribution, profile exponent α for 1.80~
1.89, sandwich layer relative index of refraction difference △ 1% are 0.9%~1.15%.
Preferably, the optical-fiber type temperature-sensing system, temperature sensing optical fiber its numerical aperture for 0.190~
0.205。
Preferably, the optical-fiber type temperature-sensing system, the splice loss, splice attenuation of temperature sensing optical fiber fusion point are less than
0.08dB。
Preferably, the optical-fiber type temperature-sensing system, laser light source use 1550nm light-pulse generators.
Preferably, the optical-fiber type temperature-sensing system, wavelength division multiplexer are used for transmission with the avalanche diode
The optical signal of 1450nm and 1660nm.
A kind of temperature sensing optical fiber is provided according to another scheme of the utility model, includes core successively from inside to outside
Layer, covering and coating；The core radius is 23.75~26.25 μm, and core refractive rate section is gradation type index distribution,
Profile exponent α is 1.80~1.89, and sandwich layer relative index of refraction difference △ 1% is preferably 1.0%~1.15%, welding
Loss is less than or equal to 0.08dB.
Preferably, the temperature sensing optical fiber, numerical aperture are 0.190~0.205.
Preferably, the temperature sensing optical fiber, sandwich layer material are co-doped with the SiO of system for germanium/fluorine2Quartz glass；It is described
Covering material is pure quartz glass.
Preferably, the temperature sensing optical fiber, 62.0~63.0 μm of cladding radius.
Preferably, the temperature sensing optical fiber, core radius are 24.5~25.5 μm, and profile exponent α is
1.84~1.86, the temperature sensing optical fiber numerical aperture is 0.195~0.200.
The longest temperature measuring distance of temperature sensing optical fiber can reach 27km, be less than in the splice loss, splice attenuation of fusion point
0.08dB, it is possible to reduce because of Temperature jump caused by fusion point, avoid fiber temperature sensing system false alarm.
In general, it can obtain down the above technical solutions conceived by the present invention are compared with the prior art,
Row advantageous effect：
(1) fiber temperature sensing system provided by the utility model, it is simple in structure, since fiber optic splicing loss is small, bandwidth
Height, therefore noise is small, signal-to-noise ratio is high, temperature-measuring results are accurate, and temperature measuring distance reaches 10km to 27km.
(2) temperature sensing optical fiber provided by the utility model is compared with general communication multimode fibre while optimizes 1550nm
Bandwidth and 1450nm loss, enhance the spatial resolution of fiber temperature sensing system, improve temperature measurement accuracy and thermometric away from
From so that multimode fibre provided by the utility model can apply to the fiber temperature sensing system of middle and long distance, and temperature measuring distance reaches
To 10km to 27km.
Preferred embodiment optimizes core radius and numerical aperture, and the splice loss, splice attenuation for making optical fiber is lower, ensures that long range light passes
Defeated effect.
Description of the drawings
Fig. 1 is fiber temperature sensing system structure diagram provided by the utility model；
Fig. 2 is temperature sensing optical fiber structure diagram provided by the utility model；
Fig. 3 is temperature sensing optical fiber refractive index profile schematic diagram provided by the utility model；
Fig. 4 is the optical fiber attenuation spectrum of temperature sensing optical fiber provided by the utility model；
Fig. 5 is the fiber temperature sensing system spatial resolution test result figure that the utility model embodiment 8 provides.
Specific embodiment
In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, below in conjunction with attached drawing and implementation
Example, the present invention is further described in detail.It should be appreciated that specific embodiment described herein is only used to explain
The utility model is not used to limit the utility model.In addition, institute in the various embodiments of the present invention described below
The technical characteristic being related to can be combined with each other as long as they do not conflict with each other.
Fiber temperature sensing system provided by the utility model, as shown in Figure 1, including laser light source, wavelength division multiplexer
(WDM), avalanche diode (APD), data acquisition device, host computer and temperature sensing optical fiber provided by the utility model；
The laser that the laser light source is sent out is connected by wavelength division multiplexer (WDM) with the temperature sensing optical fiber；It is described
Laser light source uses 1550nm light-pulse generators；
The host computer receives the data of data acquisition device acquisition.The wavelength division multiplexer (WDM) is for receiving
Temperature sensing optical fiber signal is stated, is connect with avalanche diode (APD), transmits the optical signal of 1450nm and 1660nm；
The avalanche diode (APD) connect for converting optical signal into current signal with data acquisition device, transmission
The optical signal of 1450nm and 1660nm；
The data acquisition device is connected with host computer；
The host computer receives the data of data acquisition device acquisition.
The longest temperature measuring distance of temperature sensing optical fiber can reach 27km, be less than in the splice loss, splice attenuation of fusion point
0.08dB, it is possible to reduce because of Temperature jump caused by fusion point, avoid fiber temperature sensing system false alarm.
The temperature sensing optical fiber, as shown in Fig. 2, including sandwich layer, the covering being coated on outside it and coated in covering table
The high molecular material in face；
The core radius is being 23.75~26.25 μm, preferably 24.5~25.5 μm；Core refractive rate section is gradual change
Type index distribution, profile exponent α are 1.80~1.89, preferably 1.84~1.86；Sandwich layer relative index of refraction difference
△ 1% is 1.0%~1.15%, as shown in figure 3, its splice loss, splice attenuation is less than or equal to 0.08dB；The sandwich layer material is preferably
Germanium/fluorine is co-doped with the SiO of system2Quartz glass.
62.0~63.0 μm of the cladding radius, preferably 62.1~62.7 μm, the preferred pure quartz glass of material.
The high molecular material is preferably acrylic resin or heat safe polyimide paint；When the high molecular material
During for acrylic resin, the temperature sensing optical fiber outer diameter is 245 ± 10 μm；When the high molecular material is heat safe polyamides
During imines coating, the temperature sensing optical fiber outer diameter is 160 ± 10 μm.
Its numerical aperture of the multimode fibre is 0.190~0.205, preferably 0.195~0.200；Its splice loss, splice attenuation is small
In or equal to 0.08dB, it is possible to reduce because of Temperature jump caused by fusion point, avoid fiber temperature sensing system false alarm, especially
It is in long distance transmission, and splice loss, splice attenuation is larger for thermometric influential effect.
Effective model bandwidth of the temperature sensing optical fiber provided by the utility model in 1550nm reaches more than 500MHz*km,
Optimum bandwidth is up to more than 1000MHz*km；It is less than 0.5dB/km in the attenuation of 1450nm
Multimode fibre has big mode field area and high Raman gain coefficienct, is easy to obtain optical fiber by spontaneous Raman scattering
Temperature information along the line.Typical fiber temperature sensing system exciting light using 1550nm light sources, this light source it is corresponding it is anti-this
Lentor Raman diffused light (1450nm) is joined as temperature measurement signal channel, Stokes Raman scattering light (1660nm) as thermometric
Examine channel.The utility model breaks through the thinking for carrying out fiber design for exploring laser light in the past, for fiber temperature sensing system
Optimization is made in the transmission that light and anti-Stokes Raman scattering light are scattered to Stokes Raman, by many experiments, obtains institute
The sandwich layer parameter for stating multimode fibre carries out various combination experiments, finally obtains multimode temperature measuring optical provided by the utility model
Fibre scatters wave band near light and Stokes Raman scattering optical band in Stokes Raman and unexpected light decay drop occurs
Low phenomenon.As shown in Figure 4：Communication multimode fibre known in this field will appear light decay in 1385nm wave bands and increase peak value, can cause
Anti-Stokes Raman scatters the light decay increase of light and Stokes Raman scattering light, and optical fiber provided by the utility model exists
1385nm wave band attenuation curve smoothing fluctuations, light and Stokes Raman scattering optical band are scattered on anti-Stokes Raman to be influenced
Can almost it ignore.
Meanwhile optical fiber provided by the utility model also has outstanding representation in terms of splice loss, splice attenuation, uses this in general
The temperature sensing optical fiber that utility model provides can apply to the fiber temperature sensing system of middle and long distance, the spatial resolution of system
Reach 5m, temperature resolution is less than 2 DEG C, and temperature measuring distance reaches 27km, breaks through the temperature measuring distance of existing temperature-measuring optical fiber, realizes
Middle and long distance high-resolution thermometric, as shown in Figure 5.
Temperature sensing optical fiber provided by the utility model can be used method in PCVD pipes and prepare.
Temperature sensing optical fiber provided by the utility model, middle and long distance fiber temperature sensing system, the system thermometric away from
From reaching 27km.
It is embodiment below：
1 to 4 temperature sensing optical fiber of embodiment
It is designed according to said program, is prepared for one group of optical fiber, sandwich layer is co-doped with the SiO of system for germanium/fluorine2Quartz glass,
Covering is pure quartz glass, and relevant parameter is shown in Table 1：
Table 1
5 to 8 fiber temperature sensing system of embodiment, the multimode fibre in Application Example 1 to 4 are as a result as follows：
Including laser light source, wavelength division multiplexer (WDM), avalanche diode (APD), data acquisition device, host computer and
Temperature sensing optical fiber provided by the utility model；
The laser that the laser light source is sent out is connected by wavelength division multiplexer (WDM) with the temperature sensing optical fiber；It is described
Laser light source is 1550nm pulsed laser light sources；
The temperature sensing optical fiber temperature measuring distance can reach 10 to 27km, be less than in the splice loss, splice attenuation of fusion point
0.08dB, it is possible to reduce because of Temperature jump caused by fusion point, avoid fiber temperature sensing system false alarm.
The wavelength division multiplexer (WDM) is for receiving the temperature sensing optical fiber signal, with avalanche diode (APD) even
It connects, transmits the optical signal of 1450nm and 1660nm；
The avalanche diode (APD) connect for converting optical signal into current signal with data acquisition device, transmission
The optical signal of 1450nm and 1660nm；
The data acquisition device is connected with host computer；
The host computer receives the data of data acquisition device acquisition.
Parameter is as shown in table 2：
Table 2
As it will be easily appreciated by one skilled in the art that the above is only the preferred embodiment of the utility model only, not
To limit the utility model, any modification made within the spirit and principles of the present invention, equivalent replacement and change
Into etc., it should be included within the scope of protection of this utility model.
Claims (5)
1. a kind of optical-fiber type temperature-sensing system, which is characterized in that including laser light source, wavelength division multiplexer, avalanche diode, number
According to harvester, host computer and temperature sensing optical fiber；
The laser that the laser light source is sent out is connected by wavelength division multiplexer with the temperature sensing optical fiber；
The wavelength division multiplexer connect for receiving the temperature sensing optical fiber signal with avalanche diode；
The avalanche diode connect for converting optical signal into current signal with data acquisition device；
The data acquisition device is connected with host computer；
The host computer receives the data of data acquisition device acquisition；
The temperature sensing optical fiber is multimode fibre, includes sandwich layer, covering and coating successively from inside to outside；The core radius is
23.75~26.25 μm, core refractive rate section is gradation type index distribution, and profile exponent α is 1.80~1.89,
Sandwich layer relative index of refraction difference △ 1% is 0.9%~1.15%.
2. optical-fiber type temperature-sensing system as described in claim 1, which is characterized in that the numerical aperture of the temperature sensing optical fiber
Diameter is 0.190~0.205.
3. optical-fiber type temperature-sensing system as described in claim 1, which is characterized in that the temperature sensing optical fiber fusion point
Splice loss, splice attenuation is less than 0.08dB.
4. optical-fiber type temperature-sensing system as described in claim 1, which is characterized in that the laser light source uses 1550nm arteries and veins
Wash source off.
5. optical-fiber type temperature-sensing system as described in claim 1, which is characterized in that the wavelength division multiplexer and the snowslide
Diode is used for transmission the optical signal of 1450nm and 1660nm.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114755202A (en) * | 2022-06-15 | 2022-07-15 | 中国空气动力研究与发展中心设备设计与测试技术研究所 | Polyimide optical fiber distributed humidity sensor and positioning detection method |
-
2017
- 2017-07-03 CN CN201720793929.3U patent/CN207556708U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114755202A (en) * | 2022-06-15 | 2022-07-15 | 中国空气动力研究与发展中心设备设计与测试技术研究所 | Polyimide optical fiber distributed humidity sensor and positioning detection method |
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