CN107588860B - A kind of fibre optical sensor fixing quality control method - Google Patents
A kind of fibre optical sensor fixing quality control method Download PDFInfo
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- CN107588860B CN107588860B CN201710835745.3A CN201710835745A CN107588860B CN 107588860 B CN107588860 B CN 107588860B CN 201710835745 A CN201710835745 A CN 201710835745A CN 107588860 B CN107588860 B CN 107588860B
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Abstract
The present invention relates to a kind of fibre optical sensor fixing quality control methods, to implement equipment used in the method, and the method are applied to the purposes of transformer inner fiber sensor fixing quality control, and in particular to transformer sensor field.Subtracted each other, by that can be interfered using same-phase light so as to cause the principle of diffraction pattern light intensity variation, using the light different from the light same-phase but optical path difference of input optical fibre sensor as reference, judge whether fibre optical sensor can make accurate response according only to environment temperature, to realize in the installation of fibre optical sensor, use process, the case where to its installation quality, particularly whether receive improper stress, make judgement timely and accurately.The present invention is especially suitable for the detection of transformer temperature detection fibre optical sensor, it is also applied for any being used using Bragg grating and the fibre optical sensor for measuring any physical parameter detection.
Description
Technical field
The present invention relates to a kind of fibre optical sensor fixing quality control methods, to implement equipment used in the method, with
And the method is applied to the purposes of transformer inner fiber sensor fixing quality control, and in particular to transformation transducer
Field.
Background technique
Transformer in normal conditions, since there are resistance for used coil, therefore will lead to heat in the process of running
Generation and accumulation, heat cannot such as be excluded as early as possible, then can cause transformer itself damage, jeopardize power grid normal work.?
In the process of transformer temperature control, a primary step is the detection for transformer temperature.
Fibre optical sensor is a kind of sensor being widely used at present, being capable of many objects such as measuring temperature, pressure, stress
Manage parameter.It is continuously improved in particular with Bragg grating manufacture craft, using the fibre optical sensor of Bragg grating in stabilization
The various aspects such as property, cost control, precision obtain tremendous development.Currently, the fibre optical sensor used in transformer is most absolutely
Number is for detecting transformer working temperature (CN202331102U, CN103049020A), and it makes use of the reflections of Bragg grating
Wavelength and environment temperature a kind of New temperature sensor that linearly relevant principle is made have high sensitivity, anti-electricity
The advantages that magnetic disturbance, high-temperature corrosion resistance.
But using the fibre optical sensor of Bragg grating, reflected light/transmitted light central wavelength not only has with temperature
It closes, also very sensitive to longitudinal strain, relationship are as follows:
Wherein KTFor the thermal sensitive resin of grating, KεFor the coefficient of strain of grating.
It can be seen that normal operation receives answers suffered by sensor for thermometric fibre optical sensor in transformer
Power significantly affects.On the one hand the generation root of these stress is derived from the installation quality of fibre optical sensor, such as phase between optical fiber
Mutually pulls and cause stress；On the other hand it is made derived from expanded by heating such as improper, the grating sheathing materials of fixation of fibre optical sensor
At stress.In addition, since inside transformer volumetric spaces are big, temperature distribution is non-uniform, in order to realize effective temperature control,
It generally requires to be configured to complicated detection network (CN103425149A) using multiple fibre optical sensors, this requirement is objectively
Increase the risk that fibre optical sensor goes wrong during the installation process.
In order to guarantee the positive production running of fibre optical sensor, need to survey fibre optical sensor during transformer testing
Examination and correction.Traditional verification method is usually to make its heating under actual condition, and compare biography after transformer is completed
Sensor output signal (i.e. the central wavelength of output light) and standard signal (i.e. temperature-standard of wavelength curve respective value) whether one
It causes.But there are two deficiencies for the method: first is that this method cannot momentarily detect its installation in fibre optical sensor installation process
Quality cannot especially calibrate it in the case where not changing optical fiber sensor temperature；Second is that " with temperature correction temperature
The mode of degree " is needed using additional temperature inductor, and common thermocouple thermometer is for the forceful electric power under transformer operating condition
Magnetic wave rotating ring border is more sensitive, and new error can be introduced as reference temperature.
Therefore, it is badly in need of a kind of side for preferably giving control method for the installation quality of fibre optical sensor in the prior art
Method as reference and can especially be given at any time using the physical parameter other than temperature in fibre optical sensor installation process
In the method for test.
As basic physical knowledge, light has fluctuation, and same-phase light undergoes specific optical path difference, can due to interference phase
Subtract, formula is
δ=± (2k+1) λ/2, k=0,1,2 ... ...
When interfere subtract each other when, observation site is visible to draw interference pattern caused by interference, is often used in Physical Experiment
Michelson's interferometer adjusts optical path difference and obtains interference pattern.Total light from the perspective of light intensity, after forming interference pattern
It is lower than the total light intensity of not formed interference pattern by force, therefore can be sentenced and the detection to light intensity by simple photoelectric conversion device
Whether trunk snap relates to the generation subtracted each other and be converted into can be by the electric signal of subsequent processing.Based on this principle, if it is possible to offer and light
Optical signal same-phase, co-wavelength but the optical path difference that fiber sensor is exported in the light that subtracts each other of interference, then it is observed that it is apparent because
Light intensity changes caused by interference；Since the output center wavelength of light of ideally Bragg grating is linearly closed with temperature
System, thus using interference subtract each other generation whether, can judge whether fibre optical sensor can make sound according only to environment temperature
It answers, that is, judges whether fibre optical sensor avoids the interference of improper stress during installation.
Summary of the invention
Present invention aims at the interference using light to subtract each other and the principle of bring light intensity reduction, provides a kind of Fibre Optical Sensor
Device fixing quality control method, this method can be examined in real-time perfoming school in fibre optical sensor installation process, and will not introduce
Other temperature measuring apparatus bring errors, suitable for the transformer control of fibre optical sensor installation quality.
It is described the invention proposes following fibre optical sensor fixing quality control method to solve aforementioned technical problem
Method the following steps are included:
(1) wide spectrum optical issued by wide range radiant is provided, the wide spectrum optical passes through semi-transparent semi-reflecting lens, is divided into equiphase
Light A and light B；
(2) the smooth A is imported in sensor through the incoming fibers of fibre optical sensor, and is obtained thoroughly in fibre optical sensor outlet
Light A ' is penetrated, the central wavelength of the transmitted light is defined as λA。
(3) the smooth B imports optical filter through optical fiber, obtains specified wavelength λBLight B '；
(4) the smooth B ' passes through light path dropout regulator, to form it into the light B " subtracted each other with the smooth A ' in interference；
(5) the smooth B " and the smooth A ' are imported into interference checking device, the interference checking device can be to the light
Intensity variation caused by the interference fringe that B " is generated with the smooth A ' responds, and by the response with the shape of electric signal
Formula output；
(6) when light intensity reduces, illustrate λA=λB, judge that the installation quality of fibre optical sensor meets the requirements；When light intensity not
It reduces, illustrates λA≠λB, i.e., fibre optical sensor ambient condition cannot be made correctly respond and export corresponding wavelength light letter
Number, judge that the installation quality of fibre optical sensor is undesirable.
The fibre optical sensor includes a Bragg grating；From the point of view of sensor input, output end separation, institute
Stating Bragg grating is preferably long period Bragg grating.
The light path dropout regulator is not particularly limited, as long as can (it is in designated wavelength range Δ λ according to desired wavelength
Any one point value) and the optical path difference of optical path is adjusted, specific implementation means include but is not limited to movable mirror, the equipment
It is widely used in Michelson's interferometer.
The interference checking device is not particularly limited, and reacts as long as can change to light intensity；For save at
This consideration, it is preferred to use optical signal can be converted directly into corresponding electric signal by photomultiplier tube, convenient for micro computer to signal
It is handled.
The optical filter is not particularly limited, as long as can filter light B (wide spectrum optical) and retain specified wavelength λBLight
Line.The wavelength of the wide spectrum optical is preferably between 1600-400nm.
The invention also includes implement equipment used in the fibre optical sensor fixing quality control method.The equipment includes
Wide range radiant, semi-transparent semi-reflecting lens, optical filter, light path dropout regulator and interference checking device pass through optical fiber between each component and connect
It connects；The wide range radiant issues wide spectrum optical；The wide spectrum optical is divided into the equal two-beam road of phase by semi-transparent semi-reflecting lens；
The optical filter is used to intercept light beam to obtain the light of specified wavelength；The light path dropout regulator is for adjusting in two-beam road
The optical path difference of light, to form interference fringe；The interference checking device is for detecting whether form interference condition, and will tie
Fruit exports as electronic signals；The equipment further includes the micro computer for signal control and data processing.
The invention also includes will be in the fibre optical sensor fixing quality control method and/or the equipment for transformer
Fibre optical sensor, particularly the temperature sensor with Bragg grating fixing quality control purposes.
The invention has the benefit that
1. can fibre optical sensor be detected and be calibrated at any time during the installation process, without dependent on a whole set of transformation
The completion of device equipment composition.
2. the detection process of fibre optical sensor needs not rely on additional temperature-detecting device, avoid introducing newly uncontrollable
Error.
3. detection method is applicable not only to the detection and calibration of fibre optical sensor during the installation process, additionally it is possible to having thrown
Enter the detection that the transformer used carries out fibre optical sensor.It, only need to be by the input terminal of fibre optical sensor for the purpose for realizing the latter
Detection device is respectively connected to output end.
It, can be in the premise for guaranteeing sensitivity using the photoelectric conversion technique of technology maturation 4. assay device structures are simple
Lower reduction equipment cost.Detection device can individually produce, and as mancarried device, also can be used as a module of transformer,
It is easy to install and use.
5. fibre optical sensor fixing quality control method of the present invention is used up especially suitable for transformer with temperature detection
The detection of fiber sensor, but principle as based on it is the basic principle of Bragg grating, therefore it is also applied for any use
Bragg grating and the fibre optical sensor for measuring any physical parameter detection is used.
Detailed description of the invention
Fig. 1 is the schematic illustration of fibre optical sensor fixing quality control method of the present invention.
Specific embodiment
Specific function mode of the invention is discussed in detail below by specific embodiment.
Referring to attached drawing 1, used fibre optical sensor fixing quality control method equipment includes wide range radiant, semi-transparent
Semi-reflective mirror, optical filter, light path dropout regulator and interference checking device pass through optical fiber between each component and connect.Wherein Fibre Optical Sensor
Device is placed at the temperature measuring site of inside transformer as temperature detecting element；Wide spectrum light source, semi-transparent semi-reflecting lens, optical filtering
Device, light path dropout regulator and interference checking device are individually placed at outside transformer as auxiliary device.Pass through between each equipment
Optical fiber connection, and the electric signal of final output one embodiment temperature conditions.It will be understood by those skilled in the art that in order to realize certainly
The detection of dynamicization, the auxiliary device further include the calculation process equipment such as micro computer.
The method flow that transformer temperature is detected using aforementioned temperature detection device is as follows:
(1) wide spectrum optical issued by wide range radiant is provided, the wide spectrum optical passes through semi-transparent semi-reflecting lens, is divided into equiphase
Light A and light B.
(2) on the one hand, the smooth A obtains transmitted light A ' through fiber optic conduction to fibre optical sensor.According to Prague used
The standard temperature curve of grating is it is found that when fibre optical sensor is under the constant temperature of room temperature, and transmitted light A ' is in constant temperature temperature
There is central wavelength lambda A, as fibre optical sensor reality output wavelength when spending T.
(3) on the other hand, the smooth B passes through optical filter, obtains the light B ' of specified wavelength λ B.The λ B is set to, preceding
When stating thermostat temperature T, Bragg grating wavelength according to corresponding to standard curve in fibre optical sensor used, as standard are joined
Compare wavelength.
(4) principle is subtracted each other according to light interference, when offer one with reflected light same-phase but with the light of specific optical path difference
When line, the two superposition causes light intensity to reduce.Based on this, make the smooth B ' by light path dropout regulator, so that obtaining can be with institute
It states transmitted light A ' and realizes the light B " that interference is subtracted each other.The light B " has the share the same light identical wavelength of B ', i.e. λ B.
(5) the smooth B " and the smooth A ' are imported into interference checking device, i.e., is superimposed on the receiving screen of photomultiplier tube.
When interfere subtract each other when, since luminous intensity reduces, photomultiplier tube is defeated in the form of change in electric by this intensity variation
Out.
(6) when light intensity significantly reduces, illustrate that λ A=λ B is actually installed the optical fiber used that is, in thermostat temperature T
Sensor matches for the detected value of temperature with actual temperature, then judges that the installation quality of fibre optical sensor conforms to
It asks；When reduction or only small reduction do not occur for light intensity, illustrate that λ A ≠ λ B, i.e. fibre optical sensor cannot make ambient condition
The optical signal for correctly responding and exporting corresponding wavelength out judges that the installation quality of fibre optical sensor is undesirable.
The above is only illustrative embodiment of the invention, it is noted that for the common skill of the art
For art personnel, without departing from the basic principles of the invention, several improvements and modifications can also be made, these improve and
Retouching also should be regarded as protection scope of the present invention.
Claims (10)
1. a kind of fibre optical sensor fixing quality control method, it is characterised in that the following steps are included:
(1) wide spectrum optical issued by wide range radiant is provided, the wide spectrum optical passes through semi-transparent semi-reflecting lens, is divided into equiphase smooth A
With light B；
(2) the smooth A is imported in sensor through the incoming fibers of fibre optical sensor, and is exported in fibre optical sensor and obtained transmitted light
The central wavelength of A ', the transmitted light are defined as λA；When fibre optical sensor is under the constant temperature of room temperature, transmitted light A '
There is central wavelength lambda A, as fibre optical sensor reality output wavelength in thermostat temperature T；
(3) the smooth B imports optical filter through optical fiber, obtains specified wavelength λBLight B '；The λ B is set to, in aforementioned constant temperature temperature
When spending T, Bragg grating wavelength according to corresponding to standard curve in fibre optical sensor used, as standard reference wavelength；
(4) the smooth B ' passes through light path dropout regulator, to form it into the light B " subtracted each other with the smooth A ' in interference；
(5) the smooth B " and the smooth A ' are imported into interference checking device, the interference checking device can to the smooth B " with
Intensity variation caused by the interference fringe that the smooth A ' is generated responds, and the response is defeated as electronic signals
Out；
(6) when light intensity reduces, illustrate λA=λB, judge that the installation quality of fibre optical sensor meets the requirements；When light intensity does not occur
It reduces, illustrates λA≠λB, i.e., fibre optical sensor, which cannot make ambient condition, correctly responds and exports the optical signal of corresponding wavelength,
Judge that the installation quality of fibre optical sensor is undesirable.
2. fibre optical sensor fixing quality control method according to claim 1, which is characterized in that the fibre optical sensor
Including a Bragg grating.
3. fibre optical sensor fixing quality control method according to claim 2, which is characterized in that the fibre optical sensor
Including a long period Bragg grating.
4. fibre optical sensor fixing quality control method according to claim 1, which is characterized in that the optical path difference is adjusted
Device is movable mirror.
5. fibre optical sensor fixing quality control method according to claim 1, which is characterized in that the interference detection dress
It is set to photomultiplier tube.
6. fibre optical sensor fixing quality control method according to claim 1, which is characterized in that the wave of the wide spectrum optical
It is long to be greater than 400nm, and it is less than 1600nm.
7. a kind of equipment of detection fiber sensor installation quality, which is characterized in that the equipment includes wide range radiant, semi-transparent
Semi-reflective mirror, optical filter, light path dropout regulator and interference checking device pass through optical fiber between each component and connect；Wide range radiant is logical
The incidence end that optical fiber is connected to semi-transparent semi-reflecting lens is crossed, the transmission end of semi-transparent semi-reflecting lens is connected to the incidence of optical filter by optical fiber
End, the exit end of optical filter are connected to the incidence end of light path dropout regulator by optical fiber, and the exit end of light path dropout regulator passes through
Optical fiber is connected to the first via incidence end of interference checking device, and the reflection end of semi-transparent semi-reflecting lens is connected to Fibre Optical Sensor by optical fiber
The incidence end of device, the exit end of fibre optical sensor are connected to the second tunnel incidence end of interference checking device by optical fiber；
The wide range radiant issues wide spectrum optical；
The wide spectrum optical is divided into the equal two-beam road of phase by semi-transparent semi-reflecting lens；
The optical filter is used to intercept light beam to obtain the light of specified wavelength；
The light path dropout regulator is used to adjust the optical path difference of two-beam Lu Zhongguang, to form interference fringe；
The interference checking device is for detecting whether form interference condition, and result is exported as electronic signals.
8. the purposes of fibre optical sensor fixing quality control method according to claim 1, which is characterized in that the method
It is controlled for the installation quality to the fibre optical sensor being mounted in transformer.
9. the purposes of fibre optical sensor fixing quality control method according to claim 1, which is characterized in that the method
It is controlled for the installation quality to the temperature detection fibre optical sensor being mounted in transformer.
10. the purposes of the equipment of detection fiber sensor installation quality according to claim 7, which is characterized in that described
Equipment is according to fibre optical sensor fixing quality control method described in claim 1, to the Fibre Optical Sensor being mounted in transformer
The installation quality of device is controlled.
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| CN1663039A (en) * | 2002-06-24 | 2005-08-31 | 马特森技术公司 | System and process for calibrating pyrometers in thermal processing chambers |
| CN200955961Y (en) * | 2006-08-10 | 2007-10-03 | 浙江大学 | Coherence multiplexing device for optical fiber Bragg grating sensor |
| CN103063242A (en) * | 2012-12-26 | 2013-04-24 | 武汉康普常青软件技术有限公司 | Real-time monitoring system and method based on optical time domain reflection and fiber grating distributed type |
| CN204649162U (en) * | 2015-04-15 | 2015-09-16 | 中国计量学院 | A kind of fiber grating distributed strain pick-up unit |
| CN105180977A (en) * | 2015-05-27 | 2015-12-23 | 三峡大学 | Single-fiber Michelson interferometric sensor and sensing system |
| DE102015214749A1 (en) * | 2015-08-03 | 2017-02-09 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Device and method for detecting a load and mechanical component |
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- 2017-09-16 CN CN201710835745.3A patent/CN107588860B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1663039A (en) * | 2002-06-24 | 2005-08-31 | 马特森技术公司 | System and process for calibrating pyrometers in thermal processing chambers |
| CN200955961Y (en) * | 2006-08-10 | 2007-10-03 | 浙江大学 | Coherence multiplexing device for optical fiber Bragg grating sensor |
| CN103063242A (en) * | 2012-12-26 | 2013-04-24 | 武汉康普常青软件技术有限公司 | Real-time monitoring system and method based on optical time domain reflection and fiber grating distributed type |
| CN204649162U (en) * | 2015-04-15 | 2015-09-16 | 中国计量学院 | A kind of fiber grating distributed strain pick-up unit |
| CN105180977A (en) * | 2015-05-27 | 2015-12-23 | 三峡大学 | Single-fiber Michelson interferometric sensor and sensing system |
| DE102015214749A1 (en) * | 2015-08-03 | 2017-02-09 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Device and method for detecting a load and mechanical component |
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