CN103033285A - Simultaneous measurement method of temperature and strain of laid photoelectric composite cable - Google Patents

Simultaneous measurement method of temperature and strain of laid photoelectric composite cable Download PDF

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CN103033285A
CN103033285A CN2012105666950A CN201210566695A CN103033285A CN 103033285 A CN103033285 A CN 103033285A CN 2012105666950 A CN2012105666950 A CN 2012105666950A CN 201210566695 A CN201210566695 A CN 201210566695A CN 103033285 A CN103033285 A CN 103033285A
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strain
brillouin
temperature
peak power
composite cable
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吕安强
李永倩
李静
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North China Electric Power University
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North China Electric Power University
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Abstract

The invention belongs to the measurement technical field and particular relates to a simultaneous measurement method of temperature and strain of laid photoelectric composite cable. The method includes the steps of measuring Brillouin scattering frequency moving initial value, spectral peak power initial value and Rayleigh scattering power value of sensing fiber sample fiber of the photoelectric composite cable, calculating a ratio of Brillouin scattering spectral peak power and Rayleigh scattering power, obtaining temperature and strain coefficient of Brillouin scattering frequency moving of the sensing fiber sample fiber and the temperature and the strain coefficient of Brillouin scattering relative spectral peak power through a calibration test, calculating estimated value of Brillouin spectral peak power distribution initial value of sensing fiber of the laid photoelectric composite cable, measuring Brillouin scattering frequency moving distribution and spectral peak power distribution of the sensing fiber of the laid photoelectric composite cable in real time through a Brillouin scattering measurement system and calculating real-time temperature and strain distribution of the sensing fiber. Under the premise of not obviously increasing system complexity, the simultaneous measurement method of the temperature and the strain of the laid photoelectric composite cable solves the problem of simultaneous measuring the temperature and the strain.

Description

A kind of temperature and strain while measuring method of having laid optoelectronic composite cable
Technical field
The invention belongs to field of measuring technique, particularly a kind of temperature and strain while measuring method of having laid optoelectronic composite cable.
Background technology
The Brillouin light time domain reflection technology is a kind of novel measuring technique, it realizes the measurement of temperature or strain based on the spontaneous brillouin scattering signal in the optical fiber, only have the one-shot measurement of need and can obtain simultaneously along the tested field distribution information of whole optical fiber, the particular advantages such as fast response time, measuring accuracy height, accurate positioning, anti-electromagnetic interference capability are strong, good insulation preformance, distance sensing are grown.The Brillouin light time domain reflection technology can be realized the real-time measurement to optical fiber temperature/Strain Distribution along the line, be particularly suitable for being compounded with the status monitoring that common communications is used the optoelectronic composite cable of single-mode fiber, can in time find potential faults and carry out high precision, location quick and precisely, thereby effectively guarantee the normal operation of cable.
Present Brillouin light time domain reflection technology is based on the frequency displacement information acquisition optical fiber of spontaneous brillouin scattering in the optical fiber temperature or strain information along the line.Brillouin frequency shifts changes temperature or the strain variation that is proportional to optical fiber, but when optical fiber was subject to temperature or strain simultaneously, the Brillouin light time domain reflection technology only can't be distinguished temperature and strain by Brillouin frequency shifts, namely had the cross sensitivity problem.For this problem, numerous scientific research personnel have carried out a large amount of research.
A kind of method of measuring simultaneously temperature and strain is to use two kinds of optical fiber with different Brillouin frequency shifts-temperature/coefficient of strain that the same composite rope is measured.The different linear equation in two unknowns groups of finding the solution according to Brillouin frequency shifts temperature and the coefficient of strain obtain temperature and strain simultaneously.This method need not to measure Brillouin spectrum peak power, and only the measurement by a parameter of Brillouin frequency shifts gets final product.But the optical fiber that the method needs two specific characters differ greatly is as sensor information, and the optical properties in the general optoelectronic composite cable is very approaching, and therefore, the optoelectronic composite cable that is not suitable for having laid uses.
The method of another kind of separation temperature and strain is to use simultaneously Brillouin's temperature/strain sensing equipment and Raman temperature sensing device.Because Raman scattering power is only to responsive to temperature, therefore available Raman equipment carries out temperature survey, and the temperature strain cross sensitivity of post-compensation Brillouin equipment solves separately strain.This method needs two equipment to work simultaneously, has increased complicacy and the cost of system, has reduced the real-time of measuring.And Raman equipment generally need use multimode optical fiber, and generally all is the common communications single-mode fiber in the optoelectronic composite cable, and indivedual Raman equipment also can use single-mode fiber, but expensive, measuring distance is shorter, be difficult to compare with Brillouin's equipment.
In sum, invent a kind of use and can measure simultaneously temperature and strain once cover Brillouin scattering measuring system, and it is very necessary to be applicable to measure the method for having laid optoelectronic composite cable.
Summary of the invention
The object of the invention is to, a kind of temperature and strain while measuring method of having laid optoelectronic composite cable proposed, be used for to solve utilize set up standby, when single fiber is measured optoelectronic composite cable temperature and strain, having laid optoelectronic composite cable Brillouin spectrum peak power initial value can't obtain, and can't distinguish simultaneously the problem of temperature and strain.
To achieve these goals, the technical scheme that the present invention proposes is that a kind of temperature and strain while measuring method of having laid optoelectronic composite cable is characterized in that described method comprises:
Step 1: measure Brillouin frequency shifts initial value, spectrum peak power initial value and the Rayleigh scattering performance number of sensor fibre sample fibre in the optoelectronic composite cable, calculate the ratio of Brillouin spectrum peak power and Rayleigh scattering power;
Get the sample (it is fine to be called for short sample) of composite fiber in one section optoelectronic composite cable to be measured, the sample fibre loosely is placed in the thermostat, guarantee that it is in zero strain, T 0Under ℃, the Rayleigh scattering power with Rayleigh scattering measuring system measurement sample fibre obtains one-dimension array, obtains Rayleigh scattering power initial value P after being averaging R0Measure the Brillouin frequency shifts of sample fibre and compose peak power with the Brillouin scattering measuring system, obtain two one-dimension array, obtain Brillouin frequency shifts initial value v after being averaging respectively B0With spectrum peak power initial value P B0According to C BR=P B0/ P R0Calculate zero strain, T 0Brillouin spectrum peak power under ℃ and the coefficient ratio C of Rayleigh scattering power BR
Step 2: the temperature and the coefficient of strain that obtain the temperature of the fine Brillouin frequency shifts of sensor fibre sample and the coefficient of strain, Brillouin scattering relative spectrum peak power by calibration experiment;
Utilize thermostat and strain bringing device that the sample fibre is carried out calibration experiment, the temperature that applies and strain point record the Brillouin frequency shifts v under different temperatures and the strain more than 5 BWith spectrum peak power P B, utilize the linear fit algorithm to obtain frequency displacement v BWith relative spectrum peak power P B/ P B0With the linear relationship of temperature T and strain stress, obtain the temperature coefficient C of frequency displacement respectively VT, frequency displacement coefficient of strain C V ε, relative spectrum peak power temperature coefficient C PT, relative spectrum peak power coefficient of strain C P ε
Step 3: calculate and laid the estimated value that the Brillouin of sensor fibre composes peak power distribution initial value in the optoelectronic composite cable;
Use same set of Rayleigh scattering measuring system to carry out one-shot measurement to laying the optical fiber (abbreviation sensor fibre) that is used for sensing in the optoelectronic composite cable, obtain Rayleigh scattering power data P R(z).Calculate sensor fibre at zero strain, T 0Brillouin spectrum peak power distribution estimated value P under ℃ B0(z)=C BR* P R(z), wherein z is certain constantly scattered light position on sensor fibre, and its maximal value is sensor fibre length;
Step 4: the Brillouin frequency shifts of having laid sensor fibre in the optoelectronic composite cable by the real-time measurement of Brillouin scattering measuring system distributes and the power distribution of spectrum peak, calculates real time temperature and Strain Distribution on the sensor fibre;
Use the Brillouin scattering measuring system that sensor fibre is carried out on-line measurement, can obtain the Brillouin frequency shifts distribution v on the sensor fibre B(z) and Brillouin spectrum peak power distribution P B(z), then calculate temperature and Strain Distribution on the sensor fibre:
1) calculates Brillouin frequency shifts variable quantity δ v B(z)=v B(z)-v B0
2) calculate Brillouin and compose peak power relative variation δ P B(z)/P B0(z)=(P B(z)-P B0(z))/P B0(z);
3) Temperature Distribution T (z) and the Strain Distribution ε (z) on the calculating sensor fibre:
T ( z ) ϵ ( z ) = 1 | C νT C Pϵ - C νϵ C PT | C P - C νϵ - C PT C νT δν B ( z ) δ P B ( z ) P B 0 ( z ) + T 0 0 , wherein, | C ν TC P ε-C ν εC PT| ≠ 0.
The length of the sample of composite fiber should be greater than 2 meters in the described optoelectronic composite cable to be measured.
Beneficial effect of the present invention: 1, the present invention has overcome the shortcoming that existing Brillouin light domain reflectometer can not carry out to laying optoelectronic composite cable temperature and Strain Distribution discriminating measurement, by rationally utilizing Brillouin spectrum peak power, temperature and Strain Distribution have been solved simultaneously.2, by analyzing the relation of Brillouin scattering measuring system and Rayleigh scattering measuring system measurement data in the sample fibre, obtain to lay in the optoelectronic composite cable Brillouin under the reference temperature and strain and compose peak power and distribute, and then solved the problem that the power variation is difficult to obtain in the relational expression that Brillouin composes peak power and temperature and strain.3, this invention only needs a Rayleigh scattering measuring system to measure and can obtain reference power, during long-term temperature and strain are monitored simultaneously afterwards, only needs Brillouin scattering Department of Survey to unify platform equipment and gets final product.4, obviously increase under the prerequisite of system complexity not having, solved the simultaneously-measured difficult problem of temperature and strain.
Description of drawings
Fig. 1 is the connection diagram of the fine temperature calibration device of sample;
Fig. 2 is the connection diagram of the fine strain caliberating device of sample;
Fig. 3 is photoelectric composite submarine cable Brillouin scattering measuring system or Rayleigh scattering measuring system instrumentation plan.
Embodiment
The present invention is described further below in conjunction with drawings and Examples:
1, gets the sample (it is fine to be called for short sample) of sensor fibre in 10 meters optoelectronic composite cables to be measured, all put into calibration cell for guaranteeing 10 meters sample fibres, play 3 meters tail optical fibers of connection function in the welding of one end, loosely be placed on 10 meters sample fibres in the calibration cell, as shown in Figure 1, guarantee that it is under the zero strain, 30 ℃, finishes following steps:
1) with the Rayleigh scattering signal of Rayleigh scattering measuring system measurement sample fibre, obtains one-dimension array, obtain P after being averaging R0
2) measure the Brillouin frequency shifts of sample fibre and compose peak power with the Brillouin scattering measuring system, obtain two one-dimension array, obtain Brillouin frequency shifts initial value v after being averaging respectively B0With spectrum peak power initial value P B0
3) calculate C BR=P B0/ P R0, this coefficient is exactly that Brillouin spectrum peak power under the zero strain, 30 ℃ and the ratio of Rayleigh scattering power are about 2.356 * 10 -3, this ratio is looked different Brillouin scattering measuring system can be slightly different with the Rayleigh scattering measuring system.
2, utilize calibration cell shown in Figure 1 that the sample fibre is carried out temperature calibration, the temperature spot that applies is respectively 10 ℃, 20 ℃, 30 ℃, 40 ℃, 50 ℃, 60 ℃, 70 ℃, 80 ℃; Utilizing conventional strain bringing device (semi-girder) that the sample fibre is carried out strain demarcates, connection diagram as shown in Figure 2, the strain point that applies is respectively 200 μ ε, 400 μ ε, 600 μ ε, 800 μ ε, 1000 μ ε, 1200 μ ε, 1400 μ ε, 1600 μ ε.Brillouin frequency shifts v under record different temperatures and the strain BWith spectrum peak power P B, utilize least square method to Brillouin frequency shifts and temperature, Brillouin frequency shifts and strain, Brillouin compose the peak relative power and temperature, Brillouin compose the peak relative power and linear fit is carried out respectively in strain, obtain Brillouin frequency shifts v BWith relative spectrum peak power P B/ P B0With the linear relationship of temperature T and strain stress, obtain the temperature coefficient C of frequency displacement VT, frequency displacement coefficient of strain C V ε, relative spectrum peak power temperature coefficient C PT, relative spectrum peak power coefficient of strain C P ε
3, use same Rayleigh scattering measuring system to carry out one-shot measurement to laying the optical fiber (abbreviation sensor fibre) that is used for sensing in the photoelectric composite sea cable, as shown in Figure 3, obtain Rayleigh scattering power data P R(z).According to the approximately equalised characteristics of attenuation coefficient that Brillouin scattering and Rayleigh scattering light signal transmit in optical fiber, coefficient C BRBe suitable for the Brillouin spectrum peak power of any position under the same terms and the ratio of Rayleigh scattering power; Again because the Rayleigh scattering measuring system adopts is wide spectrum light source, its Rayleigh scattering signal is subjected on the optical fiber impact of temperature and strain very little, can ignore, and the Rayleigh scattering power of namely measuring this moment and zero strain, the power under 30 ℃ are the same; Therefore, can obtain the Brillouin spectrum peak power estimated value P of sensor fibre under zero strain, 30 ℃ B0(z)=C BR* P R(z), wherein z is certain constantly scattered light position on sensor fibre, and its maximal value is sensor fibre length.
4, use the Brillouin scattering measuring system that sensor fibre is carried out on-line measurement, can obtain the Brillouin frequency shifts distribution v on the sensor fibre B(z) and Brillouin spectrum peak power distribution P B(z), finally calculate temperature and Strain Distribution on the sensor fibre:
1) calculates Brillouin frequency shifts variable quantity δ v B(z)=v B(z)-v B0
2) calculate Brillouin and compose peak power relative variation δ P B(z)/P B0(z)=(P B(z)-P B0(z))/P B0(z);
3) Temperature Distribution T (z) and the Strain Distribution ε (z) on the calculating sensor fibre:
T ( z ) ϵ ( z ) = 1 | C νT C Pϵ - C νϵ C PT | C P - C νϵ - C PT C νT δν B ( z ) δ P B ( z ) P B 0 ( z ) + T 0 0 , wherein, | C ν TC P ε-C ν εC PT| ≠ 0.
The Temperature Distribution T on the sensor fibre (z) and Strain Distribution ε (z) have just been obtained by above formula.

Claims (2)

1. a temperature of having laid optoelectronic composite cable and strain measuring method simultaneously is characterized in that described method comprises:
Step 1: measure Brillouin frequency shifts initial value, spectrum peak power initial value and the Rayleigh scattering performance number of sensor fibre sample fibre in the optoelectronic composite cable, calculate the ratio of Brillouin spectrum peak power and Rayleigh scattering power;
The sample of getting sensor fibre in one section optoelectronic composite cable to be measured is fine, and the sample fibre loosely is placed in the thermostat, guarantees that it is in zero strain, T 0Under ℃, the Rayleigh scattering power with Rayleigh scattering measuring system measurement sample fibre obtains one-dimension array, obtains Rayleigh scattering power initial value P after being averaging R0Measure the Brillouin frequency shifts of sample fibre and compose peak power with the Brillouin scattering measuring system, obtain two one-dimension array, obtain Brillouin frequency shifts initial value v after being averaging respectively B0With spectrum peak power initial value P B0According to C BR=P B0/ P R0Calculate zero strain, T 0Brillouin spectrum peak power under ℃ and the coefficient ratio C of Rayleigh scattering power BR
Step 2: the temperature and the coefficient of strain that obtain the temperature of the fine Brillouin frequency shifts of sensor fibre sample and the coefficient of strain, Brillouin scattering relative spectrum peak power by calibration experiment;
Utilize thermostat and strain bringing device that the sample fibre is carried out calibration experiment, the temperature that applies and strain point record the Brillouin frequency shifts v under different temperatures and the strain more than 5 BWith spectrum peak power P B, utilize the linear fit algorithm to obtain frequency displacement v BWith relative spectrum peak power P B/ P B0With the linear relationship of temperature T and strain stress, obtain the temperature coefficient C of frequency displacement respectively VT, frequency displacement coefficient of strain C V ε, relative spectrum peak power temperature coefficient C PT, relative spectrum peak power coefficient of strain C P ε
Step 3: calculate and laid the estimated value that the Brillouin of sensor fibre composes peak power distribution initial value in the optoelectronic composite cable;
Use same set of Rayleigh scattering measuring system to carry out one-shot measurement to laying the optical fiber that is used for sensing in the optoelectronic composite cable, obtain Rayleigh scattering power data P R(z), calculate sensor fibre at zero strain, T 0The estimated value P of the Brillouin spectrum peak power distribution initial value under ℃ B0(z)=C BR* P R(z), wherein z is certain constantly scattered light position on sensor fibre, and its maximal value is sensor fibre length;
Step 4: the Brillouin frequency shifts of having laid sensor fibre in the optoelectronic composite cable by the real-time measurement of Brillouin scattering measuring system distributes and the power distribution of spectrum peak, calculates real time temperature and Strain Distribution on the sensor fibre;
Use the Brillouin scattering measuring system that sensor fibre is carried out on-line measurement, obtain the Brillouin frequency shifts distribution v on the sensor fibre B(z) and Brillouin spectrum peak power distribution P B(z), then calculate temperature and Strain Distribution on the sensor fibre:
1) calculates Brillouin frequency shifts variable quantity δ v B(z)=v B(z)-v B0
2) calculate Brillouin and compose peak power relative variation δ P B(z)/P B0(z)=(P B(z)-P B0(z))/P B0(z);
3) Temperature Distribution T (z) and the Strain Distribution ε (z) on the calculating sensor fibre:
T ( z ) ϵ ( z ) = 1 | C νT C Pϵ - C νϵ C PT | C P - C νϵ - C PT C νT δν B ( z ) δ P B ( z ) P B 0 ( z ) + T 0 0 , wherein, | C ν TC P ε-C ν εC PT| ≠ 0.
2. method according to claim 1 is characterized in that the length of the sample of composite fiber in the described optoelectronic composite cable to be measured should be greater than 2 meters.
CN2012105666950A 2012-12-21 2012-12-21 Simultaneous measurement method of temperature and strain of laid photoelectric composite cable Pending CN103033285A (en)

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103557883A (en) * 2013-09-09 2014-02-05 华北电力大学（保定） Submarine photoelectric composite cable omni-directional monitoring and fault point accurate positioning method
CN104101379A (en) * 2014-05-26 2014-10-15 华北电力大学（保定） Laid sensing optical fiber temperature and strain simultaneous measurement method based on BOTDR
CN106840017A (en) * 2017-01-23 2017-06-13 南京大学 Method for improving Brillouin optical time-domain reflectometer strain and temperature separation accuracy
CN107179142A (en) * 2017-06-07 2017-09-19 南京大学 A kind of quick temperature measurement method that frequency changed power is determined based on Brillouin spectrum
CN107179175A (en) * 2017-05-17 2017-09-19 贵州电网有限责任公司电力科学研究院 A kind of transmission line of electricity OPGW cable broken core accurate positioning methods
CN107588789A (en) * 2017-09-05 2018-01-16 华北电力大学（保定） A kind of means of defence of distribution type fiber-optic in inside transformer
CN110186489A (en) * 2019-06-28 2019-08-30 中国南方电网有限责任公司超高压输电公司广州局 A kind of submarine cable temperature stress imitative experimental appliance and method on the bank
CN113375837A (en) * 2021-06-11 2021-09-10 中电科思仪科技股份有限公司 Method and device for automatically measuring temperature coefficient of optical quantum BOTDR optical fiber
CN113776566A (en) * 2021-08-06 2021-12-10 电子科技大学 Distributed temperature strain sensing method based on sub-pulse extraction algorithm
CN115014223A (en) * 2022-05-25 2022-09-06 汕头大学 Submarine cable deformation monitoring system based on sensing grating array

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007037366A1 (en) * 2005-09-29 2007-04-05 Sumitomo Electric Industries, Ltd. Sensor and external turbulence measuring method using the same
CN101144729A (en) * 2007-09-30 2008-03-19 南京大学 Brillouin optical time domain reflection measuring method based on quick fourier transform
WO2010061718A1 (en) * 2008-11-27 2010-06-03 ニューブレクス株式会社 Distributed optical fiber sensor

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007037366A1 (en) * 2005-09-29 2007-04-05 Sumitomo Electric Industries, Ltd. Sensor and external turbulence measuring method using the same
CN101144729A (en) * 2007-09-30 2008-03-19 南京大学 Brillouin optical time domain reflection measuring method based on quick fourier transform
WO2010061718A1 (en) * 2008-11-27 2010-06-03 ニューブレクス株式会社 Distributed optical fiber sensor

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
董玉明，张旭苹，路元刚等: "布里渊散射光纤传感器的交叉敏感问题", 《光学学报》, 28 February 2007 (2007-02-28) *
赵丽娟，吕安强，张吉生: "光纤布里渊温度和应变同时传感系统性能分析", 《光线与电缆及其应用技术》, 25 February 2009 (2009-02-25), pages 26 *

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103557883B (en) * 2013-09-09 2015-11-18 华北电力大学（保定） A kind of comprehensive monitoring of sea floor optoelectronic composite cable and trouble spot Exact Location Method
CN103557883A (en) * 2013-09-09 2014-02-05 华北电力大学（保定） Submarine photoelectric composite cable omni-directional monitoring and fault point accurate positioning method
CN104101379A (en) * 2014-05-26 2014-10-15 华北电力大学（保定） Laid sensing optical fiber temperature and strain simultaneous measurement method based on BOTDR
CN106840017B (en) * 2017-01-23 2018-11-23 南京大学 Method for improving Brillouin optical time-domain reflectometer strain and temperature separation accuracy
CN106840017A (en) * 2017-01-23 2017-06-13 南京大学 Method for improving Brillouin optical time-domain reflectometer strain and temperature separation accuracy
CN107179175A (en) * 2017-05-17 2017-09-19 贵州电网有限责任公司电力科学研究院 A kind of transmission line of electricity OPGW cable broken core accurate positioning methods
CN107179142A (en) * 2017-06-07 2017-09-19 南京大学 A kind of quick temperature measurement method that frequency changed power is determined based on Brillouin spectrum
CN107588789A (en) * 2017-09-05 2018-01-16 华北电力大学（保定） A kind of means of defence of distribution type fiber-optic in inside transformer
CN107588789B (en) * 2017-09-05 2019-11-01 华北电力大学（保定） A kind of means of defence of distribution type fiber-optic in inside transformer
CN110186489A (en) * 2019-06-28 2019-08-30 中国南方电网有限责任公司超高压输电公司广州局 A kind of submarine cable temperature stress imitative experimental appliance and method on the bank
CN110186489B (en) * 2019-06-28 2023-12-15 中国南方电网有限责任公司超高压输电公司广州局 Submarine cable temperature stress onshore simulation experiment device and method
CN113375837A (en) * 2021-06-11 2021-09-10 中电科思仪科技股份有限公司 Method and device for automatically measuring temperature coefficient of optical quantum BOTDR optical fiber
CN113776566A (en) * 2021-08-06 2021-12-10 电子科技大学 Distributed temperature strain sensing method based on sub-pulse extraction algorithm
CN115014223A (en) * 2022-05-25 2022-09-06 汕头大学 Submarine cable deformation monitoring system based on sensing grating array
CN115014223B (en) * 2022-05-25 2023-09-01 汕头大学 Submarine cable deformation monitoring system based on sensing grating array

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Application publication date: 20130410