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1.发明授权Process and device for analyzing and restoring image data in a digital signal from a scanned document 失效用于分析和恢复来自扫描文档的数字信号中的图像数据的处理和设备
公开(公告)号：US5703971A
公开(公告)日：1997-12-30
申请号：US393257
申请日：1995-02-23
CPC分类号： H04N1/403 , G06K9/38 , G06K2209/01
摘要： A process and device for analyzing image data and performing automatic optimization of a black and white image created by a scanner. The process and device performs dynamic thresholding by approximating the information level and the background level at every pixel in the image, the threshold being calculated as a function of the background and information levels at that point, and a characterization process step comparing the pixel intensity at that point with the threshold, so that if the pixel is darker, it is considered to be black, or if it is lighter, it is considered to be white.
摘要翻译： 用于分析图像数据并执行由扫描仪创建的黑白图像的自动优化的处理和装置。 该过程和设备通过近似图像中每个像素处的信息水平和背景水平来执行动态阈值，该阈值作为该点处背景和信息水平的函数被计算，并且表征处理步骤将 该点与阈值相同，因此如果像素较暗，则认为是黑色，或者如果它较浅，则认为是白色。
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公开(公告)号：US20190170593A1
公开(公告)日：2019-06-06
申请号：US15833054
申请日：2017-12-06
IPC分类号： G01K11/32
摘要： A system and method to determine temperature include an optical fiber and at least two pulse laser sources to transmit light pulses with at least two wavelengths into the optical fiber. The system also includes an optical path length modulator to modulate the optical path length of the optical fiber as the light pulses are transmitted into the optical fiber. At least two photodetectors detect backscatter reflected in the optical fiber, and a processor determines the temperature based on the backscatter.
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公开(公告)号：US20200063550A1
公开(公告)日：2020-02-27
申请号：US16106307
申请日：2018-08-21
摘要： Downhole fiber optic interrogation systems are described. The systems include a fiber optic control system, a first sensing system, a second sensing system, an optical fiber disposed within a well, and an optical switch arranged between the optical fiber and the first and second sensing systems, wherein the fiber optic control system performs time division multiplex control of the optical switch wherein the first sensing system is operably connected to the optical fiber and the second sensing system is not connected to the optical fiber, and further controls the optical switch such that the second sensing system is operably connected to the optical fiber and the first sensing system is not connected to the optical fiber.
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公开(公告)号：US11796382B2
公开(公告)日：2023-10-24
申请号：US16690950
申请日：2019-11-21
IPC分类号： G01H9/00 , G01V1/44 , G02B6/02 , E21B47/135
CPC分类号： G01H9/004 , E21B47/135 , G01V1/44 , G02B6/02342 , G01V2210/1429
摘要： An apparatus for sensing acoustic energy in a borehole penetrating the earth includes an optical interrogator and a sensing optical fiber having a length Ls optically coupled to the optical interrogator and configured to sense the acoustic energy to provide sensed acoustic data. The apparatus also includes a reference optical fiber having a length Lr optically coupled to the optical interrogator to provide reference data, wherein the optical interrogator corrects the sensed acoustic data using the reference data to provide corrected sensed acoustic data.
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公开(公告)号：US20210156734A1
公开(公告)日：2021-05-27
申请号：US16690950
申请日：2019-11-21
摘要： An apparatus for sensing acoustic energy in a borehole penetrating the earth includes an optical interrogator and a sensing optical fiber having a length Ls optically coupled to the optical interrogator and configured to sense the acoustic energy to provide sensed acoustic data. The apparatus also includes a reference optical fiber having a length Lr optically coupled to the optical interrogator to provide reference data, wherein the optical interrogator corrects the sensed acoustic data using the reference data to provide corrected sensed acoustic data.
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公开(公告)号：US10690552B2
公开(公告)日：2020-06-23
申请号：US15833054
申请日：2017-12-06
摘要： A system and method to determine temperature include an optical fiber and at least two pulse laser sources to transmit light pulses with at least two wavelengths into the optical fiber. The system also includes an optical path length modulator to modulate the optical path length of the optical fiber as the light pulses are transmitted into the optical fiber. At least two photodetectors detect backscatter reflected in the optical fiber, and a processor determines the temperature based on the backscatter.
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公开(公告)号：US11125636B2
公开(公告)日：2021-09-21
申请号：US16002752
申请日：2018-06-07
摘要： A method and apparatus for measuring a pressure. A pressure gauge includes a first plate having a resonant frequency related to a pressure at the pressure gauge. The first plate is thermally-excited at a selected frequency, and a sensor measures a first power level of a first light having a first wavelength reflected from the first plate and a second power level of a second light having a second wavelength reflected from the first plate. A processor determines a thermal drift in the resonant frequency of the first plate due to the thermal excitation of the first plate from the first power level and the second power level, corrects a pressure measurement determined from the resonant frequency of the first plate for the thermal drift of the resonant frequency, and operates a device based on the pressure measurement.
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公开(公告)号：US10746016B2
公开(公告)日：2020-08-18
申请号：US16106307
申请日：2018-08-21
摘要： Downhole fiber optic interrogation systems are described. The systems include a fiber optic control system, a first sensing system, a second sensing system, an optical fiber disposed within a well, and an optical switch arranged between the optical fiber and the first and second sensing systems, wherein the fiber optic control system performs time division multiplex control of the optical switch wherein the first sensing system is operably connected to the optical fiber and the second sensing system is not connected to the optical fiber, and further controls the optical switch such that the second sensing system is operably connected to the optical fiber and the first sensing system is not connected to the optical fiber.
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