Optics: measuring and testing – Refraction testing – Prism engaging specimen
Patent
1975-10-23
1977-11-29
Corbin, John K.
Optics: measuring and testing
Refraction testing
Prism engaging specimen
73655, 250224, G01B 1100, G01M 900
Patent
active
040603296
ABSTRACT:
A method and apparatus for measuring deflection of rotating members, such as the blades of a turbomachinery stage, are provided. The rotating member is illuminated with a high intensity light beam, such as a laser, at least one location upon the member where deflection is to be determined. Another location which serves as a reference is also illuminated in a similar manner. As the rotating member passes through the light beams, the light beams are reflected from reflective patches, thereby producing light impulses which are received by a light measuring device. The light pulses are converted to electrical impulses, the time increment between pulses being a function of the distance between the two locations and, thus, a measure of deflection. The dynamic component of blade-to-blade vibration is determined by comparing the time increments for a plurality of blades in the stage.
REFERENCES:
patent: 3782176 (1974-01-01), Jacobs
patent: 3908444 (1975-09-01), Peter
Philbert et al., "Capteur Optique de Vibrations" Mesures Regulation Automatisme (France), Jan.-Feb. 75, pp. 45-54.
Zablotskiy et al., "Contactless Measuring of Vibrations in the Rotor Blades of Turbines", FTD-HT-23-673-74, 4-1974.
Zablotskiy et al., "Experimental Determination of Natural Forms of Vibration in Blade Rows When Flutter is Present in the Blades," FTD-HT-23-674-74, 3-1974.
Corbin John K.
General Electric Company
Lampe, Jr. Robert C.
Lawrence Derek P.
Punter Wm. H.
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