Calibration of eddy current profilometry
June 6, 2008. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3356938 Combined eddy current and leakage field detector for well bore piping using a unique magnetizer core structure Eddy current method and apparatus for inspecting ferromagnetic tubular members Apparatus for measuring magnetic flux density resulting from galvanic current flow in subsurface casing using a plurality of flux gates Transducer memory circuit Method and apparatus for separating fixture-induced error from measured object characteristics and for compensating the measured object characteristic with the error, and a bow/warp station implementing same Method of locating and determining the extent of corrosion in tubular goods Fuel channel flatness measurement Method and apparatus for calibrating a displacement probe using a polynomial equation to generate a displacement look-up table Patent #: 4771237 InventorAssigneeApplicationNo. 202503 filed on 06/06/1988US Classes:702/97, Length, distance, or thickness33/504, With computer responsive to contact probe73/1.79, Displacement, motion, distance, or position324/202, Calibration324/228With means to create magnetic field to test materialExaminersPrimary: Lall, Parshotam S.Assistant: Dixon, Joseph L. Attorney, Agent or FirmInternational ClassesG01B 007/00G06F 011/00 AbstractCalibration of an eddy current probe (24) and associated data acquisition and analysis system (42, 48, 52, 54, 66) is accomplished using a step tube sample (68) having a nominal diameter portion (74) substantially equivalent to a nominal field tube (22). Two readings of eddy current test units are obtained from the step tube sample, and the diameter of the probe is used as a boundary condition on the non-linear response of the probe to variations in tube radius. A calibration curve is generated for use in converting field tube eddy current measurements to field tube radius or profile.Field of SearchVolume measurementInspection With calibration device or gauge for nuclear reactor element With computer responsive to contact probe Having program control or an analogue to digital device Pipe layout or fitting Error compensation (e.g., temperature) Adapted for a particular workpiece Electric type Borehole pipe testing With means to create magnetic field to test material Thickness measuring Roughness | |
