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公开(公告)号：US20180188077A1
公开(公告)日：2018-07-05
申请号：US15306832
申请日：2015-04-28
Applicant: OPTOPLAN AS
Inventor： Erlend Ronnekleiv , Ole Henrik Waagaard
CPC classification number: G01D5/266 , G01B9/02 , G01B2290/70 , G01D5/268
Abstract: The invention relates to a method of interrogating an interferometric optical fibre sensor system including a laser source configured to generate interrogation light and a sensor array with at least a first reflector and a second reflector. The method includes continuously and repeatedly frequency sweeping the interrogation light from the laser source within a sweep bandwidth (SWB) over a sweep duration (tsw) with a substantially constant sweep rate r=SBW/tsw to produce a swept interrogation light signal, launching the swept interrogation light signal is launched into the sensor array, detecting reflected signals being returned from the sensor array by each of the reflectors, respectively, wherein detection includes mixing a return light signal from the sensor array with a local oscillator signal onto an optical receiver to produce an electrical radio frequency signal, demultiplexing the electrical radio frequency signal into a first signal channel and a second signal channel, corresponding to the first and second reflector, respectively, demodulating each of the first and second signal channel into a first phase response from the first reflector and a second phase response from the second reflector, and subtracting the first phase response from the second phase response to obtain a sensor phase signal.
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公开(公告)号：US10247581B2
公开(公告)日：2019-04-02
申请号：US15306832
申请日：2015-04-28
Applicant: OPTOPLAN AS
Inventor： Erlend Ronnekleiv , Ole Henrik Waagaard
Abstract: The invention relates to a method of interrogating an interferometric optical fiber sensor system including a laser source configured to generate interrogation light and a sensor array with at least a first reflector and a second reflector. The method includes continuously and repeatedly frequency sweeping the interrogation light from the laser source within a sweep bandwidth (SWB) over a sweep duration (tsw) with a substantially constant sweep rate r=SBW/tsw to produce a swept interrogation light signal, launching the swept interrogation light signal into the sensor array, detecting reflected signals being returned from the sensor array by each of the reflectors, respectively, wherein detection includes mixing a return light signal from the sensor array with a local oscillator signal onto an optical receiver to produce an electrical radio frequency signal, demultiplexing the electrical radio frequency signal into a first signal channel and a second signal channel, corresponding to the first and second reflector, respectively, demodulating each of the first and second signal channel into a first phase response from the first reflector and a second phase response from the second reflector, and subtracting the first phase response from the second phase response to obtain a sensor phase signal.
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公开(公告)号：US10001362B2
公开(公告)日：2018-06-19
申请号：US14510537
申请日：2014-10-09
Applicant: Optoplan AS
Inventor： Erlend Ronnekleiv , Ole Henrik Waagaard
CPC classification number: G01B9/02075 , G01B9/02056 , G01B9/0207 , G01D5/35335 , G01D5/35387 , G01D5/3539 , G01H9/004 , G01V1/186
Abstract: A method of processing data from a distributed fibre-optic interferometric sensor system for measuring a measurand, the system comprising multiple interferometric sensors. The method comprises interrogating two or more of the multiple interferometric sensors to record a raw measurement time series for each of the sensors. The method further comprises calculating a common reference time series as a measure of central tendency of the raw measurement time series from two or more reference sensors, the reference sensors being selected from the multiple interferometric sensors. Finally, the method comprises compensating at least one raw measurement time series from a measurement sensor selected from the multiple interferometric sensors with the common reference time series to produce a compensated measurement time series, the measurement sensor being configured to be sensitive to the measurand. The invention further relates to a distributed fibre-optic interferometric sensor system.
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