Optics: measuring and testing – Velocity or velocity/height measuring – With light detector
Patent
1993-12-16
1995-10-31
Buczinsk, Stephen C.
Optics: measuring and testing
Velocity or velocity/height measuring
With light detector
60233, G01P 336, F02K 300
Patent
active
054634580
ABSTRACT:
A Mach number sensor comprises a first pulse speed sensor situated in direct contact with an open area through which a first pressure pulse can pass and a second pulse speed sensor situated in a thermally conductive tube with membrane-covered ends having stationary air through which a second pressure pulse can pass. Each of the first and second pulse speed sensors may comprise two total internal reflection detectors and a timer for determining elapsed time for passage of the pressure pulse between the two detectors. Each of the total internal reflection detectors can be selected from the group consisting of a single optical fiber having cladding removed at a surface facing the area through which the pressure pulse can pass; and a prism having a first surface facing the area through which the pressure pulse can pass, an input optical fiber optically coupled to a second surface of the prism for supplying light to the prism through the second surface, and an output optical fiber optically coupled to a third surface of the prism for detecting light emerging from the prism through the third surface.
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Buczinsk Stephen C.
General Electric Company
Kratz Ann M.
Snyder Marvin
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