Stabilized reference surface for laser vibration sensors

Details Stabilized reference surface for laser vibration sensors Stabilized reference surface for laser vibration sensors

1987-07-15

1988-10-18

Levy, Stewart J.

Measuring and testing

Vibration

Sensing apparatus

356349, 356358, G01N 2900

Patent

active

047778253

ABSTRACT:
The invention provides a vibration sensor with a platform mounted Bragg c frequency shifter and heterodyne detection system, wherein the reference beam is modulated with the component of platform vibration normal to the sensing beam, such that a similar modulation of the sensing beam is cancelled by the heterodyning process.

REFERENCES:
patent: 4180328 (1979-12-01), Drain
patent: 4379633 (1983-04-01), Bickel et al.
patent: 4466738 (1984-08-01), Huang et al.
patent: 4633715 (1987-01-01), Monchalin
patent: 4688940 (1987-08-01), Sommargren et al.

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