CN109632136A - A kind of distributed optical fiber temperature measuring method of superelevation spatial resolution - Google Patents
A kind of distributed optical fiber temperature measuring method of superelevation spatial resolution Download PDFInfo
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- CN109632136A CN109632136A CN201910123114.8A CN201910123114A CN109632136A CN 109632136 A CN109632136 A CN 109632136A CN 201910123114 A CN201910123114 A CN 201910123114A CN 109632136 A CN109632136 A CN 109632136A
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- G—PHYSICS
- 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 present invention relates to a kind of distributed optical fiber temperature measuring methods of superelevation spatial resolution.The present invention selects the computer with input-output equipment as data processing centre first；One can be realized the temperature-measuring system of distributed fibers host and one section of special sensor fibre that spatial resolution is N meters.Then data processing centre is connected with one end of temperature-measuring system of distributed fibers host with data line；One end of the other end of temperature-measuring system of distributed fibers host and one section of special sensor fibre is connected with optical fiber；By the other end optical fiber distribution frame with outside plant of one section of special sensor fibre.Last turn-on data processing center and temperature-measuring system of distributed fibers host, the corresponding extension position of temperature data that original temperature-measuring system of distributed fibers host is obtained are removed in ratio coefficient, can be obtained the distributed temperature information of superelevation spatial resolution.The present invention has effectively achieved the distributed optical fiber temperature measurement of superelevation spatial resolution, has many advantages, such as that inexpensive, structure is simple, strong operability.
Description
Technical field
The invention belongs to sensory field of optic fibre, relate to a kind of wound based on small diameter fiber to realize superelevation spatial discrimination
The optical fiber temperature-measurement method of rate.
Background technique
In recent years, fibre optical sensor is because it has high sensitivity, electromagnetism interference, corrosion-resistant, high temperature resistant, measurement range wide
The features such as obtained the extensive concern of people, and gradually developed and be applied to commercial measurement and production etc. fields, wherein being distributed
Formula optical fiber sensing system have long-distance distributed sensing capability, certain fields (such as subway, oil-gas pipeline over long distances be distributed
Formula field of temperature measurement) form the application advantage that other sensors can not replace.
Presently the most mature distributed optical fiber temperature measurement device is the distributed Raman fiber temp measuring system based on Ramam effect,
However the sensor-based system can only realize 1 meter or so of spatial resolution due to the restriction of following factor: 1, in light-pulse generator requirement
Aspect, the spatial resolution for promoting temp measuring system need the laser for being about 10ns by existing laser pulse width to be further reduced arteries and veins
Width is rushed, and other optical non-linear effects can be also resulted in this way, thermometric is caused to be distorted.2, in terms of optical-electric module, existing light
Electric modular belt width limits the space for further promoting the spatial resolution of temp measuring system.3, the spatial discrimination of temp measuring system is promoted
Rate is limited to optical signal and is converted to the data acquisition rate after electric signal, and distributed Raman fiber temp measuring system is wanted to realize 1 li
The spatial resolution of rice or so, needs to configure the data collecting card of 10G or more, cost is extremely high.Therefore, invent it is a kind of it is low at
Originally, the distributed optical fiber temperature measuring method of superelevation spatial resolution is of great significance.
Summary of the invention
In view of the deficiencies of the prior art, the present invention proposes a kind of distributed optical fiber temperature measurement sides of superelevation spatial resolution
Method.
The method of the present invention includes following steps:
Step (1) selects the computer with input-output equipment as data processing centre；One can be realized space point
The temperature-measuring system of distributed fibers host that resolution is N meters；One section of special sensor fibre.
One section of special sensor fibre is by one section of minor diameter (d) optical fiber (10 microns to 80 microns of diameter range)
Equably winding (screw pitch H) in one section of large-diameter fibre-optical (250 microns to 10 centimetres of diameter 2R range) and using solidified glue or
The fixation of person's coating material forms；One section of small diameter fiber is 62.5 micro- by common multimode fibre, such as internal diameter (outer diameter)
Rice (125 microns) or 105 microns (125 microns) or other sensor fibres commonly used in distributed temperature measuring system are further drawn
It is carefully made, therefore, to assure that manufactured small diameter fiber does not occur the mode leakage of basic mode in radius of curvature R and leads
Cause great light loss；One section of large-diameter fibre-optical can be single mode optical fiber or multimode fibre or the modeling of normal tape coat
Expect optical fiber or plastics filament, itself do not need have light-guiding function, is used only for the uniform winding of support small diameter fiber.
Step (2) connects data processing centre with one end of temperature-measuring system of distributed fibers host with data line；It will divide
The other end of cloth optical fiber temperature measurement system host and one end of one section of special sensor fibre are connected with optical fiber；It is special by one section
The other end optical fiber distribution frame with outside plant of sensor fibre.
Step (3) exists according to helical length formula, small diameter fiber length and the large-diameter fibre-optical length being wound
One ratio coefficient
Turn-on data processing center and temperature-measuring system of distributed fibers host, in data handling will be original distributed in soft-hearted part
The corresponding extension position of temperature data that optical fiber temperature measurement system host obtains, which is removed to calculate in formula, obtains ratio coefficient, can be obtained
The distributed temperature information of superelevation spatial resolution, the spatial resolution that entire distributed temperature measuring system is realized are N/F meters.
The present invention is mainly suitable for the distributed temperature sensing applications of superelevation spatial resolution, using with very little bending half
The small diameter fiber of diameter is wound on large-diameter fibre-optical, effectively increases the spatial resolution of sensor-based system, has low cost, knot
The advantages that structure is simple, strong operability.
Detailed description of the invention
Fig. 1 is structure chart of the invention；
Fig. 2 is special optical fiber structure figure；
Fig. 3 is that the optical fiber of winding prepares schematic diagram；
Fig. 4 is the temperature information figure that the temperature-measuring system of distributed fibers of superelevation spatial resolution obtains.
Specific embodiment
Below in conjunction with attached drawing, the invention will be further described.
Step (1) selects the computer with input-output equipment as data processing centre 1；One can be realized sky
Between resolution ratio be 1 meter of temperature-measuring system of distributed fibers host 2；One section of special sensor fibre 3.
The special sensor fibre 3 of described one section is by one section of 30 microns of minor diameter (d) optical fiber 5(diameter) equably wind
(screw pitch H=300 micron) are one section of large-diameter fibre-optical 4(diameter 2R=10000 micron=1 centimetre) and fixed using solidified glue and
At；One section of small diameter fiber 5 is by common multimode fibre (internal diameter and outer diameter be respectively 105 microns, 125 microns) into one
Step draws and attenuates and is made, and the cone area part 7 gradually to become smaller including diameter and junction portion 6, diameter and main body transducing part 8 are small
The mode leakage of basic mode does not occur at radius of curvature R=1 centimetre for diameter optical fiber 5；One section of large-diameter fibre-optical 4 is
Common plastics optical fiber is used to support the uniform winding of small diameter fiber 5, sees Fig. 2 and Fig. 3.
Step (2) connects data processing centre 1 with one end of temperature-measuring system of distributed fibers host 2 with data line；It will
One end of the other end of temperature-measuring system of distributed fibers host 2 and one section of special sensor fibre 3 is connected with optical fiber；By a Duan Te
The other end optical fiber distribution frame with outside plant of the sensor fibre 3 of system, is shown in Fig. 1.
Step (3) exists according to helical length formula, small diameter fiber length and the large-diameter fibre-optical length being wound
One ratio coefficient F=105.
Turn-on data processing center and temperature-measuring system of distributed fibers host will divide in soft-hearted part originally in data handling
The corresponding extension position of temperature data that cloth optical fiber temperature measurement system host obtains is removed in ratio coefficient F=105, can be obtained super
The distributed temperature information of high spatial resolution, the spatial resolution that entire distributed temperature measuring system is realized are 1/105 meter, i.e.,
0.95 centimetre.Fig. 4 gives the temperature information figure that the temperature-measuring system of distributed fibers of superelevation spatial resolution obtains, wherein illustration
The temperature information being shown near 1.01 meters and 1.03 meters of position.
The present invention proposes in the distributed optical fiber temperature measurement technical foundation of existing low spatial resolution using minor diameter
Optical Fiber Winding has effectively achieved the distributed optical fiber temperature measurement of superelevation spatial resolution to the scheme of large-diameter fibre-optical, has low
The advantages that cost, structure be simple, strong operability.
Claims (3)
1. a kind of distributed optical fiber temperature measuring method of superelevation spatial resolution, it is characterised in that method includes the following steps:
Step (1) selects the computer with input-output equipment as data processing centre；One can be realized space point
The temperature-measuring system of distributed fibers host that resolution is N meters；One section of special sensor fibre；
One section of special sensor fibre is made of one section of winding optical fiber and one section of corresponding cylindrical support object, wherein
The diameter d for winding optical fiber is 10 microns to 80 microns, equably winds and is fixed on the cylindrical support object that one section of radius is R
On, the mode leakage of basic mode does not occur in radius of curvature R for the winding optical fiber；
Step (2) connects data processing centre with one end of temperature-measuring system of distributed fibers host with data line；It will be distributed
One end of the other end of optical fiber temperature measurement system host and one section of special sensor fibre is connected with optical fiber；By one section of special sensing
The other end optical fiber distribution frame with outside plant of optical fiber；
Step (3) turn-on data processing center and temperature-measuring system of distributed fibers host, in data handling will be former in soft-hearted part
The corresponding extension position of temperature data for carrying out the acquisition of temperature-measuring system of distributed fibers host is removed in ratio coefficient F, can be obtained super
The distributed temperature information of high spatial resolution, the spatial resolution that entire distributed temperature measuring system is realized is N/F meters, described
The calculation formula of ratio coefficient F are as follows:
Wherein H is the screw pitch for winding optical fiber.
2. a kind of distributed optical fiber temperature measuring method of superelevation spatial resolution according to claim 1, it is characterised in that: institute
The diameter for the cylindrical support object stated is 250 microns to 10 centimetres.
3. a kind of distributed optical fiber temperature measuring method of superelevation spatial resolution according to claim 1 or 2, feature exist
In: the cylindrical support object be the single mode optical fiber with coat, multimode fibre, plastic optical fiber or plastics filament, itself
Do not need have light-guiding function.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110231059A (en) * | 2019-05-31 | 2019-09-13 | 南京大学 | The cable runs structure of survey disturbance based on POTDR system |
| CN112664179A (en) * | 2020-12-31 | 2021-04-16 | 核工业北京地质研究院 | Device and method for positioning water flowing fracture in drilling layered test process |
| CN113932943A (en) * | 2021-12-16 | 2022-01-14 | 山东省科学院海洋仪器仪表研究所 | Seawater surface layer temperature sensor based on LPG (liquefied Petroleum gas), temperature measuring system and method |
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|---|---|---|---|---|
| CN110231059A (en) * | 2019-05-31 | 2019-09-13 | 南京大学 | The cable runs structure of survey disturbance based on POTDR system |
| CN112664179A (en) * | 2020-12-31 | 2021-04-16 | 核工业北京地质研究院 | Device and method for positioning water flowing fracture in drilling layered test process |
| CN113932943A (en) * | 2021-12-16 | 2022-01-14 | 山东省科学院海洋仪器仪表研究所 | Seawater surface layer temperature sensor based on LPG (liquefied Petroleum gas), temperature measuring system and method |
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