Patent ID: 7530274
Filing Date: 2009-05-12
Classification: G01L,G01M

Abstract:
1. A system for sensing at least one physical characteristic associated with an engine comprising a turbine having a plurality of blades turning inside a casing, said system comprising: a casing coupled with the turbine, said casing having a longitudinal port, said port extending transverse to said casing with a first end of said port opening inside said casing; and a pressure transducer mounted substantially adjacent to said casing, in said port, said pressure transducer facing said first end, said port communicating to said pressure transducer a first pressure in the presence of said turbine blades and a second pressure when said turbine blade is not present; wherein, said pressure transducer has a frequency response capability which is a multiple of the blade passing frequency, and a processor receiving said first and second pressure outputs to determine a clearance between said blades and casing.