Position detector

Details Position detector Position detector

1983-11-09

1986-08-05

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

33263, 33286, G01N 2186

Patent

active

046045260

ABSTRACT:
A detector for checking the symmetry of a helicopter rotor while it is rotating has a scanner (11) which scans vertically a field of view (15) and the view is interrupted by a vertical strip on the blade tip (16). A slot (18) in the strip gives a characteristic signal as at (L.sub.2). The position of the signal (L.sub.2) in a scanning cycle gives an indication of the height of the blade tip and also the circumferential spacing between blades.

REFERENCES:
patent: 2964849 (1960-12-01), Roccati
patent: 4053227 (1977-10-01), Bodlaj
patent: 4465367 (1984-08-01), Sabatier

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