公开(公告)号：US20080024785A1

公开(公告)日：2008-01-31

申请号：US11779527

申请日：2007-07-18

申请人： Mark Froggatt ,  Ryan Seeley ,  Dawn Gifford

发明人： Mark Froggatt ,  Ryan Seeley ,  Dawn Gifford

IPC分类号： G01B9/02

CPC分类号： G01M11/3172

摘要： The technology described here enables the use of an inexpensive laser to measure an interferometric response of an optical device under test (DUT) at reflection lengths significantly greater than the coherence length of the laser. This is particularly beneficial in practical interferometric applications where cost is a concern. In other words, inexpensive lasers having shorter coherence lengths may be used to achieve very high interferometric measurements at longer DUT reflection lengths. The technology also enables the use of such inexpensive lasers to measure Rayleigh scatter in commercial-grade, single-mode optical fiber.

摘要翻译： 这里描述的技术使得能够使用廉价的激光器以显着大于激光器的相干长度的反射长度来测量被测光学器件（DUT）的干涉测量响应。 这在成本是关注的实际干涉测量应用中特别有益。 换句话说，具有较短相干长度的便宜的激光器可以用于在更长的DUT反射长度上实现非常高的干涉测量。 该技术还能够使用这种便宜的激光器来测量商用级单模光纤中的瑞利散射。

公开(公告)号：US11137271B2

公开(公告)日：2021-10-05

申请号：US16799627

申请日：2020-02-24

申请人： Ryan Seeley

发明人： Ryan Seeley

IPC分类号： G01K11/32 ,  G01D5/353 ,  G01L1/24 ,  G01K11/3206

摘要： Various embodiments of sensors are described that exhibit several spectral features that together offer coverage of a wavelength range corresponding to the desired strain dynamic range (or temperature range) of a system. The spectral features arise from a Fabry-Perot interferometer formed by two overlapping chirped FBGs, the free-spectral range (FSR) of which varies with wavelength. The spectral features may be differentiated due to a combination of spacing and slope of the overlapped, chirped gratings.

公开(公告)号：US20210231526A1

公开(公告)日：2021-07-29

申请号：US17301730

申请日：2021-04-13

申请人： Ryan Seeley

发明人： Ryan Seeley

IPC分类号： G01M11/00 ,  G01B9/02

摘要： Multi-spectral feature sensing techniques and sensor and related digital signal processing circuitry and methods. A method of operating a digital signal processing circuitry includes acquiring optical frequency domain reflectometry (OFDR) data from an interferometer operably coupled to a tunable laser and a sensing fiber, separating sensor signals corresponding to sensors of the sensing fiber from the OFDR data, and inferring a relative shift of a separated sensor signal. A digital signal processing circuitry includes a front end circuitry and a back end circuitry. The front end circuitry is configured to isolate sensor responses from an input signal including OFDR data. The back end circuitry is configured to determine a phase shift corresponding to each isolated sensor response.

公开(公告)号：US11385130B2

公开(公告)日：2022-07-12

申请号：US17301730

申请日：2021-04-13

申请人： Ryan Seeley

发明人： Ryan Seeley

IPC分类号： G01B9/02 ,  G01M11/00

摘要： Multi-spectral feature sensing techniques and sensor and related digital signal processing circuitry and methods. A method of operating a digital signal processing circuitry includes acquiring optical frequency domain reflectometry (OFDR) data from an interferometer operably coupled to a tunable laser and a sensing fiber, separating sensor signals corresponding to sensors of the sensing fiber from the OFDR data, and inferring a relative shift of a separated sensor signal. A digital signal processing circuitry includes a front end circuitry and a back end circuitry. The front end circuitry is configured to isolate sensor responses from an input signal including OFDR data. The back end circuitry is configured to determine a phase shift corresponding to each isolated sensor response.

公开(公告)号：US11371893B2

公开(公告)日：2022-06-28

申请号：US16349204

申请日：2017-11-10

申请人： Ryan Seeley

发明人： Ryan Seeley

IPC分类号： G01K11/3206 ,  G01L1/24

摘要： The various embodiments described here comprise an OFDR system and technique that may be used for inference of strain or temperature over a large dynamic range using a narrow wavelength range. Embodiments of the sensor fiber may be composed of one or more multi-spectral-feature sensors, each sensor exhibiting several spectral features that together offer coverage over a wavelength range corresponding to the desired system strain and or temperature dynamic range.

公开(公告)号：US09766131B2

公开(公告)日：2017-09-19

申请号：US12735813

申请日：2009-02-20

申请人： Ryan Seeley ,  Mark E. Froggatt

发明人： Ryan Seeley ,  Mark E. Froggatt

IPC分类号： G01J9/02

CPC分类号： G01J9/0246

摘要： A tunable laser wavelength measurement system includes an interferometric wavelength tracking system that uses a combination of interferometric and wavelength reference measurements to directly measure the laser output wavelength, The measurement exhibits the following desirable error signal characteristics: directional information, continuity, low latency, absolute information, high accuracy, high precision, and little or no drift, A tunable laser wavelength control system additionally incorporates electronics to compare the measured laser wavelength to a desired wavelength or wavelength function, and to generate a feedback control signal to control the wavelength of the laser output based on the comparison. In one non-limiting example implementation, the desired wavelength function is repetitive. The difference between the desired wavelength function and the interferometrically-measured wavelength function is taken, and a successive approximation technique is employed to calculate and adjust a repetitive controlling signal to obtain the desired wavelength function.

公开(公告)号：US20200271485A1

公开(公告)日：2020-08-27

申请号：US16799627

申请日：2020-02-24

申请人： Ryan Seeley

发明人： Ryan Seeley

IPC分类号： G01D5/353 ,  G01K11/32 ,  G01L1/24

摘要： Various embodiments of sensors are described that exhibit several spectral features that together offer coverage of a wavelength range corresponding to the desired strain dynamic range (or temperature range) of a system. The spectral features arise from a Fabry-Perot interferometer formed by two overlapping chirped FBGs, the free-spectral range (FSR) of which varies with wavelength. The spectral features may be differentiated due to a combination of spacing and slope of the overlapped, chirped gratings.

公开(公告)号：US20190285487A1

公开(公告)日：2019-09-19

申请号：US16349204

申请日：2017-11-10

申请人： Ryan Seeley

发明人： Ryan Seeley

IPC分类号： G01K11/32 ,  G01L1/24

摘要： The various embodiments described here comprise an OFDR system and technique that may be used for inference of strain or temperature over a large dynamic range using a narrow wavelength range. Embodiments of the sensor fiber may be composed of one or more multi-spectral-feature sensors, each sensor exhibiting several spectral features that together offer coverage over a wavelength range corresponding to the desired system strain and or temperature dynamic range.

公开(公告)号：US20110122906A1

公开(公告)日：2011-05-26

申请号：US12735813

申请日：2009-02-20

申请人： Ryan Seeley ,  Mark E. Froggatt

发明人： Ryan Seeley ,  Mark E. Froggatt

IPC分类号： H01S3/00 ,  G01B9/02

CPC分类号： G01J9/0246

摘要： A tunable laser wavelength measurement system includes an interferometric wavelength tracking system that uses a combination of interferometric and wavelength reference measurements to directly measure the laser output wavelength, The measurement exhibits the following desirable error signal characteristics: directional information, continuity, low latency, absolute information, high accuracy, high precision, and little or no drift, A tunable laser wavelength control system additionally incorporates electronics to compare the measured laser wavelength to a desired wavelength or wavelength function, and to generate a feedback control signal to control the wavelength of the laser output based on the comparison. In one non-limiting example implementation, the desired wavelength function is repetitive. The difference between the desired wavelength function and the interferometrically-measured wavelength function is taken, and a successive approximation technique is employed to calculate and adjust a repetitive controlling signal to obtain the desired wavelength function.

摘要翻译： 可调激光波长测量系统包括干涉波长跟踪系统，其使用干涉测量和波长参考测量的组合来直接测量激光输出波长。测量显示以下期望的误差信号特征：方向信息，连续性，低延迟，绝对信息 ，高精度，高精度，很少或没有漂移。可调谐激光波长控制系统还包括电子器件，以将测量的激光波长与期望的波长或波长功能进行比较，并产生反馈控制信号以控制激光器的波长 输出基于比较。 在一个非限制性示例实现中，期望的波长函数是重复的。 采用所需波长函数和干涉测量波长函数之间的差异，并采用逐次逼近技术来计算和调整重复控制信号以获得期望的波长函数。