Method and apparatus for automatic and contactless measurement o

Details Method and apparatus for automatic and contactless measurement o Method and apparatus for automatic and contactless measurement o

1975-10-03

1977-10-11

Corbin, John K.

Optics: measuring and testing

Range or remote distance finding

With photodetection

356 1, 356 5, 356 24, G01C 308

Patent

active

040532275

ABSTRACT:
A method and apparatus for measuring the height of a blade of a turbine rotor as the rotor is being rotated characterized by deflecting a laser beam at a given deflection frequency across the path of the moving blade so that a portion of the deflected beam will be reflected by the end of the blade, sensing the reflected portion to produce a reflected signal, synchronizing the speed of rotation of the rotor with the frequency of deflection so that the end of the blade and the deflected beam reach the same point simultaneously and applying the reflected laser signal and a reference signal from the laser beam to an electronic analysis system to determine the height of the individual blade. Preferably, the synchronizing is accomplished by sensing the blade frequency, converting it to a converted blade frequency, comparing the converted blade frequency with the frequency of deflection to obtain an error signal and using the error signal to control the speed of rotation of the rotor. By including a counter circuit in the electronic analysis circuit and by sensing a mark on the rotor during each rotation of the rotor, adjustments can be made to either determine the height of each blade in a stage of blades during one revolution or to determine the height of a single individual blade of the stage.

REFERENCES:
patent: 2827823 (1958-03-01), Shurcliff
patent: 2964849 (1960-12-01), Roccati
patent: 3692414 (1972-09-01), Hosterman et al.
patent: 3856410 (1974-12-01), Swift et al.
patent: 3923395 (1975-12-01), Bodlaj

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