Position detector

Details Position detector Position detector

1988-05-16

1989-10-17

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356400, G01N 2186

Patent

active

RE0330973

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: 3658426 (1972-04-01), Vyce
patent: 3856410 (1974-12-01), Swift
patent: 4053227 (1977-10-01), Bodlaj
patent: 4105925 (1978-08-01), Rossol et al.
patent: 4155650 (1979-05-01), Yasue et al.
patent: 4277176 (1981-07-01), Grosvernier
patent: 4465367 (1984-08-01), Sabatier
Instruction Manual from Fairchild, Model CCD 1300, Line Scan Camera Sub-System, Published 1977 by Fairchild Camera & Instrument Corporation.

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