Accession Number : ADD008836

Title :   Speed Measuring Apparatus.

Descriptive Note : Patent Application,


Personal Author(s) : Coffman,Kenneth L

Report Date : 20 May 1981

Pagination or Media Count : 10

Abstract : A speed measuring apparatus is provided for indicating a percentage of nominal full speed RPM of a jet engine and also for indicating time required for accelerating and decelerating the engine. A generator output is converted to a square wave and a time interval measurement is made between zero crossings of the square wave. The square wave controls the starting and stopping of a time period counter and measured time is converted to percent RPM which is displayed on a digital incandescent display. Similar time periods are measured when the engine is advanced from idle to full power, and also when the engine is retarded from full power to idle. (Author)

Descriptors :   *Patent applications, *Counters, Rotation, Analog to digital converters, Inlet guide vanes, Jet engines, Velocity, Acceleration, Deceleration, Time intervals, Measuring instruments, Square waves, Display systems, Digital systems, Comparators

Subject Categories : Test Facilities, Equipment and Methods
      Jet and Gas Turbine Engines

Distribution Statement : APPROVED FOR PUBLIC RELEASE