Radiant energy – Ionic separation or analysis – Static field-type ion path-bending selecting means
Patent
1987-09-17
1989-05-16
Sikes, William L.
Radiant energy
Ionic separation or analysis
Static field-type ion path-bending selecting means
350 962, 350 9621, 250227, 250225, G02B 626, G02B 636, H01J 516
Patent
active
048304492
ABSTRACT:
A speed sensor for sensing the rotational speed of an N bladed fan in a turbo-machine application includes a polarization-preserving optical circuit positioned adjacent the locus described by the remote ends of the blades. First and second sets of sensing segments of the optical circuit are spaced apart from one another by an angular spacing equal to that of the blades and with the first set of sensing segments angularly offset from the second set and with the first and second sets cross-coupled to transpose the polarization modes. The orthogonal polarization modes of optical energy launched into the optical circuit are subjected to phase shifts as the optical fiber is perturbed by pressure variations caused by the moving fan blades with the cumulative phase shift in each portion of the optical circuit subtracted as a consequence of the cross-coupling and the resulting light output having an intensity or other characteristics that vary as a function of the rotational speed of the fan.
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Epps Georgia Y.
Sikes William L.
Simmonds Precision Products Inc.
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