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公开(公告)号：US11652544B2
公开(公告)日：2023-05-16
申请号：US17164927
申请日：2021-02-02
发明人： Michael Eiselt , Mirko Lawin , Florian Azendorf
IPC分类号： H04B10/071 , H04B10/50
CPC分类号： H04B10/071 , H04B10/50
摘要： The present disclosure relates to an optical time domain reflectometry method including the steps of feeding a plurality of unipolar optical probe signals to a near end of an optical path under test, receiving a corresponding plurality of reflected unipolar optical receive signals, creating a corresponding plurality of digital receive data signals, calculating at least one correlation signal by correlating the digital receive data signals with a bit sequence corresponding to a respective probe bit sequence, and determining the signal propagation delay between the near end of the optical path and a respective reflective position. The present disclosure also relates to an optical time domain reflectometry system in which this method is implemented and a computer program having instructions to cause the optical time domain reflectometer and to execute the method herein.
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公开(公告)号：US20210242936A1
公开(公告)日：2021-08-05
申请号：US17164927
申请日：2021-02-02
发明人： Michael Eiselt , Mirko Lawin , Florian Azendorf
IPC分类号： H04B10/071 , H04B10/50
摘要： The present disclosure relates to an optical time domain reflectometry method including the steps of feeding a plurality of unipolar optical probe signals to a near end of an optical path under test, receiving a corresponding plurality of reflected unipolar optical receive signals, creating a corresponding plurality of digital receive data signals, calculating at least one correlation signal by correlating the digital receive data signals with a bit sequence corresponding to a respective probe bit sequence, and determining the signal propagation delay between the near end of the optical path and a respective reflective position. The present disclosure also relates to an optical time domain reflectometry system in which this method is implemented and a computer program having instructions to cause the optical time domain reflectometer and to execute the method herein.
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公开(公告)号：US11307104B2
公开(公告)日：2022-04-19
申请号：US16832915
申请日：2020-03-27
发明人： Michael Eiselt , Florian Azendorf
IPC分类号： G01L1/24 , G01D21/02 , G01K11/3206
摘要： The invention relates to a method for optically sensing a parameter of the group of temperature, humidity or mechanical stress using at least one optical sensor which includes a chirped Bragg grating and an optical reference reflector. The method includes the steps of; creating at least one optical probing signal having a predetermined center wavelength and a bandwidth that lies, for the whole range of the parameter to be sensed, within the reflection bandwidth of the chirped Bragg grating; feeding the at least one optical probing signal to the at least one optical sensor; receiving at least one optical reflection signal created by the at least one optical sensor, wherein the at least one optical reflection signal includes, for each of the at least one optical sensor, a first partial reflection signal created by the optical reference reflector and a second partial reflection signal created by the chirped Brag grating of the respective at least one optical sensor; measuring the group delay between the first and second partial reflection signal created by each of the at least one optical sensor; and determining, for each of the at least one optical sensors, an absolute or relative value of the at least one parameter using the group delay measured and a reference information. The invention further relates to a sensor arrangement for implementing the method as well as to an optical sensor that is suitable for being used in such a sensor arrangement.
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公开(公告)号：US20230221190A1
公开(公告)日：2023-07-13
申请号：US18096290
申请日：2023-01-12
发明人： Michael Eiselt , Florian Azendorf , Sander Jansen
摘要： Provided is an apparatus for determining the temperature of at least one fluid. The apparatus includes an optical fiber. A first end of the optical fiber is connected to at least one fiber tip, and a first additional reflector is introduced into the at least one fiber tip at a first predetermined distance from an outer end of the at least one fiber tip. A second end of the optical fiber is connected to a processing apparatus. The processing apparatus includes an optical source. The optical source is configured to launch an optical signal into the optical fiber, and a coherent detector. The coherent detector is configured to determine the temperature of at least one fluid by receiving a first light signal that corresponds to parts of the optical signal that are reflected at the outer end of the at least one fiber tip when the at least one fiber tip is inserted into the at least one fluid and a second light signal that corresponds to parts of the optical signal that are reflected at the first additional reflector when the at least one fiber tip is inserted into the at least one fluid, determining a difference of the optical phases of the first light signal and the second light signal, and determining the temperature of the at least one fluid based on the difference of the optical phases of the first light signal and the second light signal.
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公开(公告)号：US20200309621A1
公开(公告)日：2020-10-01
申请号：US16832915
申请日：2020-03-27
发明人： Michael Eiselt , Florian Azendorf
摘要： The invention relates to a method for optically sensing a parameter of the group of temperature, humidity or mechanical stress using at least one optical sensor which includes a chirped Bragg grating and an optical reference reflector. The method includes the steps of; creating at least one optical probing signal having a predetermined center wavelength and a bandwidth that lies, for the whole range of the parameter to be sensed, within the reflection bandwidth of the chirped Bragg grating; feeding the at least one optical probing signal to the at least one optical sensor; receiving at least one optical reflection signal created by the at least one optical sensor, wherein the at least one optical reflection signal includes, for each of the at least one optical sensor, a first partial reflection signal created by the optical reference reflector and a second partial reflection signal created by the chirped Brag grating of the respective at least one optical sensor; measuring the group delay between the first and second partial reflection signal created by each of the at least one optical sensor; and determining, for each of the at least one optical sensors, an absolute or relative value of the at least one parameter using the group delay measured and a reference information. The invention further relates to a sensor arrangement for implementing the method as well as to an optical sensor that is suitable for being used in such a sensor arrangement.
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