Apparatus including distance sensors mounted on rotating shaft for measuring distances inside a turbine
Patent 4659988 Issued on April 21, 1987. Estimated Expiration Date: 
January 3, 2006. 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.
January 3, 2006. 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 References3035353 InventorsApplicationNo. 06/816136 filed on 01/03/1986US Classes:324/207.25, Rotary324/219, Magnetic sensor within material324/262, Magnetic test structure elements33/542, Internal415/118, WITH INSPECTION, SIGNALING, INDICATING OR MEASURING MEANS73/660Rotating machinery or deviceExaminersPrimary: Strecker, Gerard R.Attorney, Agent or FirmInternational ClassG01B 7/14 (20060101)AbstractApparatus for measuring precise distances between the turbine shaft and the interior surfaces of the inner and outer cylinders of a turbine is disclosed. A mandrel carrying proximity transducers is placed inside the inner and outer cylinders and rotated to preselected points. A proximeter generates a radio frequency electromagnetic field which is radiated in the immediate area of the proximity transducers. Energy losses caused by eddy currents generated in the interior surface of inner and outer cylinders are converted into linear output by a computer. Distances between the interior surface of the turbine and the transducers are calculated from the linear output. Comparison of measurements made with the top halves of the turbine removed with measurements made with the turbine halves installed permit determination of the "sag" in the turbine spindle introduced when the turbine is assembled. | |
