CN110296767A - A kind of submarine temperatures measuring device and method based on triangle interstitial fibre structure - Google Patents
A kind of submarine temperatures measuring device and method based on triangle interstitial fibre structure Download PDFInfo
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- CN110296767A CN110296767A CN201910612846.3A CN201910612846A CN110296767A CN 110296767 A CN110296767 A CN 110296767A CN 201910612846 A CN201910612846 A CN 201910612846A CN 110296767 A CN110296767 A CN 110296767A
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- interstitial
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- 239000000835 fiber Substances 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title claims abstract description 13
- 230000003287 optical effect Effects 0.000 claims abstract description 91
- 239000013307 optical fiber Substances 0.000 claims abstract description 69
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 36
- 238000002474 experimental method Methods 0.000 claims description 3
- 239000004065 semiconductor Substances 0.000 claims description 3
- 238000005259 measurement Methods 0.000 abstract description 5
- 230000005540 biological transmission Effects 0.000 abstract description 4
- 230000000295 complement effect Effects 0.000 abstract description 4
- 239000000463 material Substances 0.000 abstract description 3
- 239000010453 quartz Substances 0.000 abstract description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract description 3
- 238000012512 characterization method Methods 0.000 abstract 1
- 238000004078 waterproofing Methods 0.000 abstract 1
- 230000008859 change Effects 0.000 description 3
- 238000005253 cladding Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- YNPNZTXNASCQKK-UHFFFAOYSA-N phenanthrene Chemical compound C1=CC=C2C3=CC=CC=C3C=CC2=C1 YNPNZTXNASCQKK-UHFFFAOYSA-N 0.000 description 2
- 238000004861 thermometry Methods 0.000 description 2
- 229910052934 alunite Inorganic materials 0.000 description 1
- 239000010424 alunite Substances 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000011514 reflex Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- KPZTWMNLAFDTGF-UHFFFAOYSA-D trialuminum;potassium;hexahydroxide;disulfate Chemical compound [OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[Al+3].[Al+3].[Al+3].[K+].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O KPZTWMNLAFDTGF-UHFFFAOYSA-D 0.000 description 1
Classifications
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Temperature Or Quantity Of Heat (AREA)
Abstract
The invention discloses a kind of submarine temperatures measuring device and method based on triangle interstitial fibre structure, described device includes netted fixing sleeve, incident optical and output optical fibre；The incident optical and output optical fibre are relatively fixed in the netted fixing sleeve, and the optical axis of the incident optical and output optical fibre is located along the same line；In netted fixing sleeve, the incidence end of output optical fibre is cone, and the output end of incident optical and the incidence end of output optical fibre are complementary, and centre forms triangle gap, and water enters the gap through netted fixing sleeve.The present invention is based on triangle interstitial fibre structures, with optical fiber as Sensitive Apparatus, and the variation of the variation characterization temperature according to the light intensity transmitted in optical fiber.Because optical fiber is quartz material, performance is stablized, in water can also be with normal transmission optical signal, so not needing to do water-proofing treatment.Secondly, fiber size is smaller, fibre optic temperature sensor is used in the duct, needs not worry about influence of the sensor to water flow velocity.Also, fibre optical sensor is laid immediately on inside pipeline, is directly contacted with water to be measured, is improved measurement accuracy.
Description
Technical field
The invention belongs to underwater optical fibre technical field of temperature measurement, and in particular to one kind is based on triangle interstitial fibre structure
Submarine temperatures measuring device and method.
Background technique
The method that submarine temperatures measurement traditionally uses water power resistance electrode, but influenced by factors such as water flow, hydraulic pressure, it surveys
The error of the water temperature signal of amount is larger.It is accurate to energy and steady with the appearance of the emerging application such as underwater robot or deep-sea detecting
Fixed acquisition submarine temperatures signal becomes the eager needs in some fields.
Fibre optic temperature sensor uses optical fiber as Sensitive Apparatus, and characterizes temperature according to the variation for the light intensity transmitted in optical fiber
Variation.Because optical fiber is quartz material, performance is stablized, in water can also be with normal transmission optical signal, so not needing to do anti-
Water process.Secondly, fiber size is smaller, fibre optic temperature sensor is used in the duct, needs not worry about sensor to water flow velocity
Influence.Also, fibre optical sensor is laid immediately on inside pipeline, is directly contacted with water to be measured, is improved measurement accuracy.
Summary of the invention
The present invention proposes a kind of submarine temperatures measuring device and method based on triangle interstitial fibre structure, with triangle
The optical fiber structure in gap is as temperature sensor, and when light transmits in a fiber, when through the air gap, the water temperature in air-gap becomes
Change the light intensity for changing transmission light, detection water temperature variation is changed according to light intensity.
To realize the above-mentioned technical purpose, the technical scheme adopted by the invention is as follows:
A kind of submarine temperatures measuring device based on triangle interstitial fibre structure, including netted fixing sleeve, incident optical
And output optical fibre；
The incident optical and output optical fibre are relatively fixed in the netted fixing sleeve, the incident optical and output light
Fine optical axis is located along the same line；In netted fixing sleeve, the incidence end of output optical fibre is cone, the output end of incident optical
Complementary with the incidence end of output optical fibre, centre forms triangle gap, and water enters the gap through netted fixing sleeve.
To optimize above-mentioned technical proposal, the concrete measure taken further include:
A kind of thermometry of above-mentioned submarine temperatures measuring device based on triangle interstitial fibre structure, including
Following steps:
Light source emits optical signal to optical fibre temperature survey apparatus under the triangle Interstitial Water；
Measure the Output optical power of output optical fibre in optical fibre temperature survey apparatus under the triangle Interstitial Water；
According to the refractive index of water in Output optical power calculated gap；
Refractive index by calculating gained water, which is tabled look-up, obtains water temperature.
Above-mentioned light source uses semiconductor laser, emits ultra-wideband optical signal.
The Output optical power of above-mentioned output optical fibre includes that the optical power of half on incident optical fibre core optical axis enters output
One half optical power enters the optical power of output optical fibre under the optical power and incident optical fibre core optical axis of fiber core.
The optical power of half and the optical power ratio system into output optical fibre fibre core on above-mentioned incident optical fibre core optical axis
Number is m=k (h/a)2, k is the coefficient of coup, and h is incident optical refraction point to the vertical range of optical axis, and a is fiber core radius；It is described
Coefficient of coup k is obtained according to experiment.
Under above-mentioned incident optical fibre core optical axis one half optical power enter the optical power of output optical fibre fibre core with it is described enter
It is equal with the optical power of output optical fibre fibre core is entered to penetrate the optical power of half on fiber core optical axis.
The invention has the following advantages:
Apparatus of the present invention are suitable for the measurement of submarine temperatures, and not only size is small, light weight, and quartz material to hydraulic pressure not
Sensitivity, measurement error very little.
Detailed description of the invention
Fig. 1 is a kind of submarine temperatures measuring device structural schematic diagram based on triangle interstitial fibre structure of the invention；
Fig. 2 is light path schematic diagram of the light in triangle gap in the embodiment of the present invention.
Specific embodiment
The embodiment of the present invention is described in further detail below in conjunction with attached drawing.
As shown in Figure 1, a kind of submarine temperatures measuring device based on triangle interstitial fibre structure of the invention, including net
Shape fixing sleeve, incident optical and output optical fibre；
The incident optical and output optical fibre are relatively fixed in the netted fixing sleeve, the incident optical and output light
Fine optical axis is located along the same line；
In netted fixing sleeve, the incidence end of output optical fibre is cone, the output end of incident optical and entering for output optical fibre
It is complementary to penetrate end, centre forms triangle gap, and water enters the gap through netted fixing sleeve.
A kind of thermometry of the submarine temperatures measuring device based on triangle interstitial fibre structure, including following step
It is rapid:
Step 1: light source emits optical signal to optical fibre temperature survey apparatus under the triangle Interstitial Water；
In embodiment, the light source uses semiconductor laser, emits ultra-wideband optical signal.
Step 2: measuring the Output optical power of output optical fibre in optical fibre temperature survey apparatus under the triangle Interstitial Water；
If fiber end face, when the light direction of propagation forms an angle, the Fresnel reflection of the glancing incidence light in fibre core is several
It can all enter in fibre cladding, cause biggish loss, so the structure of this fiber end face can not detect reverse transfers
Fresnel reflection light.But due to inclination angle, the refraction of the insertion loss and tilt angles, gap of forward direction transmission light
The factors such as rate are related, and the variation of water temperature can be measured by the relationship of insertion loss and refractive index.
As shown in Fig. 2, the light of incident optical horizontal transport can fully enter output optical fibre and (not consider phenanthrene when very close to each other
Alunite ear reflex), but when there is an inclination alpha in end face, only some light can enter output optical fibre fibre core and transmit, another part
Light can enter output optical fibre cladding loss fall, into output optical fibre light ratio then with air-gap refractive index n0It is related.
If the light from A point to optical axis can enter output optical fibre through refraction, the vertical range of A point to optical axis is h.According to folding
Penetrate theorem, n1Sin θ=n0sinθ0,+α=90 ° θ, then θ0=arcsin (n1cosα/n0), in △ ABC:
∠ BAC=θ0- θ=θ0-90°-α；
AC=(a-h) ctg α+L；
AC·tg(θ0- θ)=a-h；
(a-h)tg(θ0- 90 ° of-α)+L=a-h；
L=(a-h) [tg (θ0-90°-α)-1]。
The optical power of half and the optical power proportionality coefficient into output optical fibre fibre core on the incident optical fibre core optical axis
For m=k (h/a)2, k is the coefficient of coup, and h is incident optical refraction point to the vertical range of optical axis, and a is fiber core radius；The coupling
Coefficient k is closed to be obtained according to experiment.
Then on incident optical fibre core optical axis the optical power of half and enter output optical fibre fibre core optical power:
Fiber core radius a in formula, inclination alpha, air-gap spacing L, fiber core refractive index n1, incident light total light intensity P is known quantity.
For the optical power of half under optical axis, due to tilt angles and upper half symmetrical complement, the incident optical fibre core
The optical power of half enters the light function of half in the optical power and the incident optical fibre core optical axis of output optical fibre fibre core under optical axis
Rate is equal with the optical power of output optical fibre fibre core is entered, then the total optical power of last output optical fibre are as follows: Po=2P1.
Step 3: according to the refractive index of water in Output optical power calculated gap；
Step 4: the refractive index by calculating gained water, which is tabled look-up, obtains water temperature: the refractive index n of the water in gap0With the change of water temperature
Change changes, so Output optical power also just changes with water temperature, to detect the variation of water temperature.
The above is only the preferred embodiment of the present invention, protection scope of the present invention is not limited merely to above-described embodiment,
All technical solutions belonged under thinking of the present invention all belong to the scope of protection of the present invention.It should be pointed out that for the art
For those of ordinary skill, several improvements and modifications without departing from the principles of the present invention should be regarded as protection of the invention
Range.
Claims (6)
1. a kind of submarine temperatures measuring device based on triangle interstitial fibre structure, it is characterised in that: including netted fixing sleeve,
Incident optical and output optical fibre；
The incident optical and output optical fibre are relatively fixed in the netted fixing sleeve, the incident optical and output optical fibre
Optical axis is located along the same line；
In netted fixing sleeve, the incidence end of output optical fibre is cone, the output end of incident optical and the incidence end of output optical fibre
Complementation, centre form triangle gap, and water enters the gap through netted fixing sleeve.
2. a kind of temperature of submarine temperatures measuring device based on triangle interstitial fibre structure according to claim 1 is surveyed
Amount method, it is characterised in that: the following steps are included:
Light source emits optical signal to optical fibre temperature survey apparatus under the triangle Interstitial Water；
Measure the Output optical power of output optical fibre in optical fibre temperature survey apparatus under the triangle Interstitial Water；
According to the refractive index of water in Output optical power calculated gap；
Refractive index by calculating gained water, which is tabled look-up, obtains water temperature.
3. a kind of temperature of submarine temperatures measuring device based on triangle interstitial fibre structure according to claim 2 is surveyed
Amount method, it is characterised in that: the light source uses semiconductor laser, emits ultra-wideband optical signal.
4. a kind of temperature of submarine temperatures measuring device based on triangle interstitial fibre structure according to claim 2 is surveyed
Amount method, it is characterised in that: the Output optical power of the output optical fibre includes the optical power of half on incident optical fibre core optical axis
One half optical power enters the optical power of output optical fibre under into the optical power of output optical fibre fibre core and incident optical fibre core optical axis.
5. a kind of temperature of submarine temperatures measuring device based on triangle interstitial fibre structure according to claim 2 is surveyed
Amount method, it is characterised in that: the optical power of half and the light function into output optical fibre fibre core on the incident optical fibre core optical axis
Rate proportionality coefficient is m=k (h/a)2, k is the coefficient of coup, and h is incident optical refraction point to the vertical range of optical axis, and a is fibre core
Radius；The coefficient of coup k is obtained according to experiment.
6. a kind of temperature of submarine temperatures measuring device based on triangle interstitial fibre structure according to claim 2 is surveyed
Amount method, it is characterised in that: one half optical power enters the optical power of output optical fibre fibre core under the incident optical fibre core optical axis
It is equal with the optical power of output optical fibre fibre core is entered with the optical power of half on the incident optical fibre core optical axis.
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|---|---|---|---|
| CN201910612846.3A CN110296767B (en) | 2019-07-09 | 2019-07-09 | Underwater temperature measuring device based on triangular gap optical fiber structure |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910612846.3A CN110296767B (en) | 2019-07-09 | 2019-07-09 | Underwater temperature measuring device based on triangular gap optical fiber structure |
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| CN110296767A true CN110296767A (en) | 2019-10-01 |
| CN110296767B CN110296767B (en) | 2021-04-20 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0510833A (en) * | 1991-06-28 | 1993-01-19 | Furukawa Electric Co Ltd:The | Fiber for temperature sensor |
| CN103852191A (en) * | 2013-12-30 | 2014-06-11 | 哈尔滨工程大学 | Optical fiber temperature sensor insensitive to refractive index |
| CN104614092A (en) * | 2015-02-12 | 2015-05-13 | 哈尔滨理工大学 | Modular interface temperature sensor of liquid-core optical fiber |
| CN108279039A (en) * | 2018-01-08 | 2018-07-13 | 东北大学 | A kind of two-parameter sensing device of temperature and refractive index based on optical fiber misconstruction and Sagnac rings |
| CN108981955A (en) * | 2018-07-27 | 2018-12-11 | 燕山大学 | A kind of optical fibre temperature survey apparatus |
| CN109932078A (en) * | 2019-03-27 | 2019-06-25 | 哈尔滨工业大学（威海） | A kind of highly sensitive optical fiber sensing probe and preparation method thereof |
-
2019
- 2019-07-09 CN CN201910612846.3A patent/CN110296767B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0510833A (en) * | 1991-06-28 | 1993-01-19 | Furukawa Electric Co Ltd:The | Fiber for temperature sensor |
| CN103852191A (en) * | 2013-12-30 | 2014-06-11 | 哈尔滨工程大学 | Optical fiber temperature sensor insensitive to refractive index |
| CN104614092A (en) * | 2015-02-12 | 2015-05-13 | 哈尔滨理工大学 | Modular interface temperature sensor of liquid-core optical fiber |
| CN108279039A (en) * | 2018-01-08 | 2018-07-13 | 东北大学 | A kind of two-parameter sensing device of temperature and refractive index based on optical fiber misconstruction and Sagnac rings |
| CN108981955A (en) * | 2018-07-27 | 2018-12-11 | 燕山大学 | A kind of optical fibre temperature survey apparatus |
| CN109932078A (en) * | 2019-03-27 | 2019-06-25 | 哈尔滨工业大学（威海） | A kind of highly sensitive optical fiber sensing probe and preparation method thereof |
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| CN110296767B (en) | 2021-04-20 |
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Application publication date: 20191001 Assignee: Jiangsu Nangong Testing Co.,Ltd. Assignor: NANJING INSTITUTE OF TECHNOLOGY Contract record no.: X2024980001802 Denomination of invention: A Underwater Temperature Measurement Device Based on Triangle Gap Fiber Optic Structure Granted publication date: 20210420 License type: Common License Record date: 20240202 |
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