-
公开(公告)号：US10209100B2
公开(公告)日：2019-02-19
申请号：US15238658
申请日：2016-08-16
发明人： Gregor Cedilnik , Thomas Lauber , Alf Clement , Markus van Riesen
摘要： A fiber measurement device for measuring a physical quantity by a fiber and a method for shaping a pulse of electromagnetic radiation are disclosed. The fiber measurement device comprises an electromagnetic radiation source and an adjustment unit. The electromagnetic radiation source generates at least one pulse of electromagnetic radiation as primary electromagnetic radiation to be coupled into the fiber, and an adjustment unit. The adjustment unit, prior to, during or after application of the primary electromagnetic radiation to the fiber, adjusts a shape of the at least one pulse for at least partially compensating a deviation between a target shape and an actual shape of the at least one pulse.
-
公开(公告)号：US11193817B2
公开(公告)日：2021-12-07
申请号：US16737638
申请日：2020-01-08
发明人： Gregor Cedilnik
摘要： An arrangement for distributed acoustic sensing and sensor integrity monitoring is adapted to operate in a first operation mode and in a second operation mode. In the first operation mode, the arrangement injects a first light pattern (and successively injects a second light pattern having substantially the same wavelength, both light patterns generated using a light launching module, into the fiber; determines a backscatter change between first backscatter dependent light and second backscatter dependent light detected by the detector, to determine a time change of a characteristic of the fiber. In the second operation mode, the arrangement injects another first light pattern and successively another second light pattern; to determine a backscatter average of other first backscatter dependent light and other second backscatter dependent light detected by the detector, to determine a static characteristic of the fiber.
-
公开(公告)号：US10935417B2
公开(公告)日：2021-03-02
申请号：US16167390
申请日：2018-10-22
发明人： Gregor Cedilnik
IPC分类号： G01H9/00 , G01D5/353 , E21B47/135
摘要： A distributed acoustic sensing (DAS) system has a coherent light source device that repeatedly sends a coherent interrogating light pattern (CILP) into an optical sensing fiber during a measurement duration that is equal to or greater than a down-up travel time of the optical sensing fiber. The CILP is one of a plurality of patterns composed of coherent carrier light. A detection device detects backscattered light in the optical sensing fiber in response to the CILP and generates a signal indicative of the detected backscattered light. An evaluation device analyses the signal. Each CILP has similar physical properties that render the light patterns indistinguishable by comparing physical properties of the backscattered light responsive to at least two successive interrogating light patterns as detected. The coherent light source device can change the time between successively sent interrogating light patterns after the passing of at least one measurement time duration.
-
公开(公告)号：US10378928B2
公开(公告)日：2019-08-13
申请号：US15849339
申请日：2017-12-20
发明人： Wissem Sfar Zaoui , Clemens Pohl
摘要： A system and method for dynamically calibrating a distributed fiber optic sensing system is disclosed. The calibration system includes a light source for generating pulses of coherent light, an optical fiber arranged at least partly in a ground soil region to guide the light and a photo detector for detecting scattered light returning from the optical fiber in dependence of time. The method includes obtaining information from which a temporal change of an acoustic transfer characteristic of the ground soil region is derivable and calibrating a distributed acoustic sensing system based on the changed acoustic transfer characteristic.
-
公开(公告)号：US20200225079A1
公开(公告)日：2020-07-16
申请号：US16737638
申请日：2020-01-08
发明人： Gregor Cedilnik
IPC分类号： G01H9/00
摘要： An arrangement for distributed acoustic sensing and sensor integrity monitoring is adapted to operate in a first operation mode and in a second operation mode. In the first operation mode, the arrangement injects a first light pattern (and successively injects a second light pattern having substantially the same wavelength, both light patterns generated using a light launching module, into the fiber; determines a backscatter change between first backscatter dependent light and second backscatter dependent light detected by the detector, to determine a time change of a characteristic of the fiber. In the second operation mode, the arrangement injects another first light pattern and successively another second light pattern; to determine a backscatter average of other first backscatter dependent light and other second backscatter dependent light detected by the detector, to determine a static characteristic of the fiber.
-
公开(公告)号：US20180259385A1
公开(公告)日：2018-09-13
申请号：US15918144
申请日：2018-03-12
发明人： Gregor Cedilnik
摘要： Provided is a method for determining strain change in an optical fiber. The method includes injecting pulsed radiation into the optical fiber; interfering the radiation backscattered from plural locations within the fiber with reference radiation; detecting plural intensities of the interfered radiation associated with the plural locations; deriving plural temporal phase changes based on the plural intensities; for any target location along the fiber: setting a variable first aggregation range and/or second aggregation range to respective start aggregation range values; a) deriving a first phase aggregation value based on plural temporal phase changes of radiation returning from the first aggregation range including locations behind the target location; b) deriving a second phase aggregation value based on plural temporal phase changes of radiation travelled to a second aggregation range including locations in front of the target location; c) determining a signal (strain indicative value) associated with the target location based on a phase aggregation value difference between the first phase aggregation value and second phase aggregation value; performing the above steps a), b), c) while varying the first and/or second aggregation range values to respective final aggregation range values until a criterion is satisfied.
-
公开(公告)号：US20170052041A1
公开(公告)日：2017-02-23
申请号：US15238658
申请日：2016-08-16
发明人： Gregor Cedilnik , Thomas Lauber , Alf Clement , Markus van Riesen
IPC分类号： G01D5/26
CPC分类号： G01D5/268 , G01D5/35358 , G01K11/32 , G01L1/242 , G01L1/247 , G01M11/3109 , G01M11/3118 , G01M11/3145
摘要： A fiber measurement device for measuring a physical quantity by a fiber and a method for shaping a pulse of electromagnetic radiation are disclosed. The fiber measurement device comprises an electromagnetic radiation source and an adjustment unit. The electromagnetic radiation source generates at least one pulse of electromagnetic radiation as primary electromagnetic radiation to be coupled into the fiber, and an adjustment unit. The adjustment unit, prior to, during or after application of the primary electromagnetic radiation to the fiber, adjusts a shape of the at least one pulse for at least partially compensating a deviation between a target shape and an actual shape of the at least one pulse.
摘要翻译： 公开了一种用于通过光纤测量物理量的光纤测量装置和用于形成电磁辐射脉冲的方法。 光纤测量装置包括电磁辐射源和调节单元。 电磁辐射源产生至少一个电磁辐射脉冲作为要耦合到光纤中的主要电磁辐射，以及调节单元。 调整单元在将主要电磁辐射施加到光纤之前，期间或之后调整至少一个脉冲的形状，以至少部分地补偿目标形状与至少一个脉冲的实际形状之间的偏差 。
-
公开(公告)号：US20160258808A1
公开(公告)日：2016-09-08
申请号：US15060430
申请日：2016-03-03
发明人： Gregor Cedilnik
CPC分类号： G01J1/0425 , G01B11/16 , G01D5/25 , G01D5/35364 , G01J1/42 , G01J2001/4238 , G01K11/32 , G01K2011/324 , G01N21/474 , G01N2021/4742
摘要： Distributed optical sensing devices are provided. The device may comprise a computing unit configured to receive signals indicative of an amount of light backscattered in an optical fiber and detected by a light detector; wherein the computing unit is further configured to correct the received signal for an amount of backscattered light undetected by the light detector due to dead time of the light detector. Or, the device may comprise a first light detector having a first light sensitivity and configured to detect light backscattered in a first distance range of an optical fiber; and a second light detector different to the first light detector and having a second light sensitivity being higher than the first light sensitivity, wherein the second light detector is configured to detect light backscattered in a second distance range of an optical fiber being farther away from the second light detector than the first distance range is away from the first light detector. Or, the device may comprise an optical fiber; a light source coupled to the optical fiber and configured to input a light pulse into the optical fiber; and at least one photon counting type detector. Then, either the detector has a dynamic range having an upper boundary and a lower boundary, being coupled to the optical fiber and being configured to measure light backscattered from a distance range of the optical fiber and to generate a signal indicative of the amount of the detected backscattered light, wherein the device is configured to restrict the generated signal to the dynamic range while maintaining a strength of the inputted light pulse, or alternatively, the detector has an input terminal optically coupled to the optical fiber and configured to receive the backscattered light pulse, and the device further comprises a variable attenuator arranged before the input terminal, wherein the distributed optical sensing device is configured to modify an attenuation of the backscattered light pulse during a single measuring cycle by the variable attenuator.
-
公开(公告)号：US11320302B2
公开(公告)日：2022-05-03
申请号：US16596333
申请日：2019-10-08
发明人： Gregor Cedilnik
摘要： An arrangement for high rate fiber optical distributed acoustic sensing includes an optical fiber, a light launch module adapted to inject a first coherent light pattern into the optical fiber and to inject a second coherent light pattern into the optical fiber while first Rayleigh backscatter light of the first light pattern is propagating in the optical fiber, wherein the first coherent light pattern and the second coherent light pattern have a light pattern power above a nonlinear effect related power limit; and a detector adapted to detect the first Rayleigh backscatter light and to detect second Rayleigh backscatter light of the second light pattern.
-
公开(公告)号：US10697824B2
公开(公告)日：2020-06-30
申请号：US15918144
申请日：2018-03-12
发明人： Gregor Cedilnik
摘要： Provided is a method for determining strain change in an optical fiber. The method includes injecting pulsed radiation into the optical fiber; interfering the radiation backscattered from plural locations within the fiber with reference radiation; detecting plural intensities of the interfered radiation associated with the plural locations; deriving plural temporal phase changes based on the plural intensities; for any target location along the fiber: setting a variable first aggregation range and/or second aggregation range to respective start aggregation range values; a) deriving a first phase aggregation value based on plural temporal phase changes of radiation returning from the first aggregation range including locations behind the target location; b) deriving a second phase aggregation value based on plural temporal phase changes of radiation travelled to a second aggregation range including locations in front of the target location; c) determining a signal (strain indicative value) associated with the target location based on a phase aggregation value difference between the first phase aggregation value and second phase aggregation value; performing the above steps a), b), c) while varying the first and/or second aggregation range values to respective final aggregation range values until a criterion is satisfied.
-
-
-
-
-
-
-
-
-
搜索结果
19 条记录 (耗时 0.013 秒)
