CN106989281B - A kind of fluid pipeline leakage detection method based on optical fiber Raman temperature sensor - Google Patents

A kind of fluid pipeline leakage detection method based on optical fiber Raman temperature sensor Download PDF

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Publication number
CN106989281B
CN106989281B CN201710379579.0A CN201710379579A CN106989281B CN 106989281 B CN106989281 B CN 106989281B CN 201710379579 A CN201710379579 A CN 201710379579A CN 106989281 B CN106989281 B CN 106989281B
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China
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detection
conversion zone
leakage
pipeline
conversion
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CN106989281A (en
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王强
宋俊俊
范昕伟
谷小红
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China Jiliang University
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China Jiliang University
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17DPIPE-LINE SYSTEMS; PIPE-LINES
    • F17D5/00Protection or supervision of installations
    • F17D5/02Preventing, monitoring, or locating loss
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N25/00Investigating or analyzing materials by the use of thermal means
    • G01N25/72Investigating presence of flaws

Abstract

The invention discloses a kind of fluid pipeline leakage detection method based on optical fiber Raman temperature sensor, it includes: the first step, will test optical fiber and be close to detection duct bottom;Conversion layer is arranged in detection fiber and the external of detection pipeline in second step, and the bottom of the conversion layer is arc conversion zone, and the inside not leak detection liquid of the conversion zone, outside can be with Liquid penetrant testing liquid;Separation layer is arranged in the external of the conversion layer in third step;4th step monitors the change of temperature field around detection fiber by fibre optic temperature sensor, and when detecting pipeline has leakage, leakage liquid reacts with conversion zone, releases heat, obtains leakage information according to temperature change;This is of great significance for the development and application of optical fiber Raman temperature sensor.

Description

A kind of fluid pipeline leakage detection method based on optical fiber Raman temperature sensor
Technical field
The invention belongs to detection fields more particularly to a kind of fluid pipeline based on optical fiber Raman temperature sensor to leak inspection Survey method.
Background technique
Currently, the development of fiber Raman temperature sensor technology also can be applied to fire with the development of optical fiber sensing technology The technical fields such as calamity detection, the detection technique are more obvious for temperature change detection, but not for the leak detection of water pipe It can directly apply, especially the pipeline junction of water pipe and the easily damaged injury of water pipe, one of the main reasons for this is that since water pipe is let out Temperature change is not significant enough when leakage, and is easy to be influenced by factors such as extraneous rainwater, so if can have a kind of device (or side Method) signal of pipe leakage can be converted (or temperature signal amplification), thus to be passed by fiber Raman temperature Sensor detects that pipe leakage creates condition, this is of great significance for the leak detection and on-line monitoring of water pipe, also must The application that fibre optic temperature sensor can so be promoted, especially for the detection and monitoring of the easy leakage region of the water pipes such as water pipe junction It is of great significance.
Summary of the invention
In view of the above-mentioned deficiencies in the prior art, it is an object of the present invention to provide a kind of liquid based on optical fiber Raman temperature sensor It is unconspicuous to solve the problems, such as that distributed optical fiber temperature sensor collects signal for body pipeline leakage detection method.
Purpose to realize the present invention, is achieved using following technical scheme: one kind being based on fiber Raman temperature sensing The fluid pipeline leakage detection method of device, comprising the following steps:
The first step will test optical fiber abutting detection duct bottom;
Conversion layer is arranged in detection fiber and the external of detection pipeline in second step, and the bottom of the conversion layer is arc reaction Layer, the inside not leak detection liquid of the conversion zone, outside can be with Liquid penetrant testing liquid;
Separation layer is arranged in the external of the conversion layer in third step;
4th step monitors the change of temperature field around detection fiber by fibre optic temperature sensor, when detection pipeline is let out When leakage, leakage liquid reacts with conversion zone, releases amount of heat and is brought rapidly up so as to cause ambient enviroment, according to temperature Variation obtains leakage information.
Further, distance of the bottom end of the separation layer apart from least 1 centimetre of conversion zone bottom end.
Further, the conversion layer wraps up the detection pipeline and detection fiber.
Further, conversion zone is arranged in subaerial side of conversion layer, while to be close to detection on the inside of the conversion zone The inside (i.e. close to the side of pipeline) of optical fiber, the conversion zone is made of watertight plastic material, the outside of the conversion zone It is made of the fibrous material of infiltration.
Further, the separation layer uses antiseep, and resistant material is made, and the bottom of the separation layer is sink Shape.
The beneficial effects of the present invention are:
1, conversion layer is tightly arranged outside detection pipeline due to the present invention, the bottom of the conversion layer is provided with conversion zone, should Conversion zone is made using special media, the special media encounter detection pipeline internal liquid when can distribute amount of heat to Cause ambient enviroment to be brought rapidly up, will lead to the conversion layer when detecting the liquid leakage in pipeline in this way and discharge big calorimetric Amount causes the temperature field around detection fiber that significant changes occur, since the variation meeting modulation optical fiber in temperature field is in Raman scattering Intensity, liquid leakage signal is converted to apparent temperature change signal, this just for detection provide convenience.
2, conversion layer of the present invention subaerial side in setting is provided with conversion zone, adopts on the inside of the conversion zone It is made of water-tight material, the outside of the conversion zone is made of seepage material, and the outside of the conversion zone and above-mentioned separation layer Bottom end set at least 1 centimetre of distance, and the inside for being close to above-mentioned conversion zone is arranged in the detection fiber;
Since the conversion zone being arranged on conversion layer is located in side near the ground, so no matter water pipe which side leak, by Duct bottom can be all flow in gravity principle further to react with conversion zone;It need to only arrange that a detection fiber can be quasi- in this way Really detect leakage problem;
Since the inside of the conversion zone is water-tight, even if waterpipe wall leads to have droplet to be attached to its surface due to environment reason The case where temperature of conversion zone will not be caused to change, reduce erroneous judgement generation;
Since the outside of the conversion zone is set at a distance from least 1 centimetre with the bottom end of above-mentioned separation layer, only work as in this way Cause water surface elevation that the medium of conversion zone can just be made to meet water when being more than 1 centimetre of the separation layer bottom end when water pipe leaks anti- Temperature change should occur, improve the accuracy of detection.
Detailed description of the invention
Fig. 1 is that the present invention lays schematic diagram.
In figure, 1, conversion layer;2, separation layer;3, detection fiber;4, conversion zone;P, pipeline is detected.
Specific embodiment
Below according to attached drawing, the present invention will be described in detail.
Embodiment one:
As shown in Figure 1, liquid is that tap water elaborates to the present invention in default detection pipeline P, the present invention includes inspection Test tube road P, the conversion layer 1 being tightly arranged on the outside of detection pipeline P, and the separation layer 2 outside the conversion layer 1 is set;
The conversion layer 1 is conversion zone 4 in subaerial side, and the inside of the conversion zone 4 is (i.e. close to the one of pipeline Side) it is made of watertight plastic material, the outside of the conversion zone 4 is made of the fibrous material of infiltration;
Using the limestone material medium for being 15% containing equally distributed calcium oxide content in the conversion zone 4 It is made;
Distance of the bottom end of the separation layer 2 apart from above-mentioned at least 1 centimetre of 4 bottom end of conversion zone;
The separation layer 2 uses the polyurethane material of waterproof, anti-corrosion, heat preservation to be made and water is in the bottom of the separation layer 3 Channel-shaped, influence of the separation layer 2 to obstruct the external environments such as external rainwater;
When detection,
The first step will test the abutting detection of optical fiber 3 bottom pipeline P;
Conversion layer 1 is arranged in detection fiber 3 and the external of detection pipeline P in second step, and the bottom of the conversion layer 1 is arc Conversion zone 4, the inside not leak detection liquid of the conversion zone 4, outside can be with Liquid penetrant testing liquid;
Separation layer 2 is arranged in the external of the conversion layer 1 in third step;
4th step monitors the change of temperature field around detection fiber P by fibre optic temperature sensor, when detection pipeline P has When leakage, leakage liquid reacts with conversion zone 4, releases heat, obtains leakage information according to temperature change.
The principle is as follows:
When detecting pipeline P does not have water leakage, then detecting the temperature field outside pipeline P will not change, then detects institute Obtained temperature does not have significant change, even if summer water wall has droplet, does not leak since the inside of above-mentioned conversion zone 4 uses Water material is made, and droplet can't be made to react with conversion zone 4;
When detecting pipeline P has water leakage, since the bottom of separation layer 2 is sink shape, the water leakage in pipeline P is detected Afterwards, when the depth of the water in 2 bottom of separation layer makes the water surface touch the outside of conversion zone 4, the calcium oxide of water and conversion zone 4 It reacts, releases heat, modulated the temperature field around detection fiber 3, so that optical fiber Raman temperature sensor is detected Temperature vary widely, more accurate leakage information can be obtained by post-processing.
Corresponding reaction medium can be selected in conversion zone 4 according to the actual situation for other liquid, such as: it is defeated Liquor charging body is nitric acid, and medium selects copper powder.
The present invention is that fibre optic temperature sensor is created condition applied to the leakage of water pipe, and greatly reduces test leakage mistake The probability of survey is of great significance for the development of fiber Raman sensor.

Claims (3)

1. a kind of fluid pipeline leakage detection method based on optical fiber Raman temperature sensor, which is characterized in that this method includes Following steps:
The first step will test optical fiber (3) abutting detection bottom pipeline (P);
Conversion layer (1) is arranged in detection fiber (3) and the external of detection pipeline (P) in second step, and the bottom of the conversion layer (1) is Arc conversion zone (4), the inside not leak detection liquid of the conversion zone (4), outside can be with Liquid penetrant testing liquid;
Separation layer (2) are arranged in the external of the conversion layer (1) in third step;
4th step monitors the change of temperature field around detection fiber (P) by fibre optic temperature sensor, when detection pipeline (P) has When leakage, leakage liquid reacts with conversion zone (4), releases heat, obtains leakage information according to temperature change;
Wherein, the conversion zone (4) is arranged in subaerial side of the conversion layer, while to be close on the inside of the conversion zone Detection fiber, the inside of the conversion zone are made close to the side of pipeline of watertight plastic material, the conversion zone Outside using infiltration fibrous material be made.
2. a kind of fluid pipeline leakage detection method based on optical fiber Raman temperature sensor according to claim 1, It is characterized in that, the distance of the bottom end of the separation layer (2) apart from least 1 centimetre of conversion zone (4) bottom end.
3. a kind of fluid pipeline leakage detection method based on optical fiber Raman temperature sensor according to claim 1, It is characterized in that, the conversion layer (1) wraps up the detection pipeline (P) and detection fiber (3).
CN201710379579.0A 2017-05-25 2017-05-25 A kind of fluid pipeline leakage detection method based on optical fiber Raman temperature sensor Active CN106989281B (en)

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CN106764454B (en) * 2017-01-25 2020-06-23 山西科达自控股份有限公司 Distributed optical fiber ribbon and distributed optical fiber sensing pipe network monitoring device
US10760742B2 (en) * 2018-03-23 2020-09-01 Rosemount Inc. Non-intrusive pipe wall diagnostics
CN109140250B (en) * 2018-11-01 2020-05-08 重庆大学 Gas-liquid transport pipeline leakage point on-line monitoring system based on distributed optical fiber sensing
CN110529744A (en) * 2019-07-30 2019-12-03 江阴爱科森博顿聚合体有限公司 A kind of dedicated optical cable nylon sheath wire material of pipe leakage detection
CN111463510B (en) * 2020-04-14 2021-05-11 傲普(上海)新能源有限公司 Soft package battery module and manufacturing method thereof
CN111693432A (en) * 2020-06-04 2020-09-22 山东大学 Automatic monitoring system and method for water leakage on surface of structure

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CN105021309A (en) * 2015-07-14 2015-11-04 南京航空航天大学 Spliced heatable high-precision distributed optical fiber temperature sensor
CN205618902U (en) * 2016-04-26 2016-10-05 唐山丰南君业节能保温材料有限公司 Prefabricated direct -burried insulating tube with energy -conserving monitor function
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CN106287236A (en) * 2015-06-10 2017-01-04 中国计量学院 Distributed monitoring leak from oil gas pipe system
CN105021309A (en) * 2015-07-14 2015-11-04 南京航空航天大学 Spliced heatable high-precision distributed optical fiber temperature sensor
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Application publication date: 20170728

Assignee: Xinchang China Metrology University Enterprise Innovation Research Institute Co.,Ltd.

Assignor: China Jiliang University

Contract record no.: X2021330000071

Denomination of invention: A liquid pipeline leakage detection method based on optical fiber Raman temperature sensor

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Assignor: China Jiliang University

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Date of cancellation: 20211231