Radio frequency strain monitor

Details Radio frequency strain monitor Radio frequency strain monitor

1988-06-07

1989-06-27

Laroche, Eugene R.

Oscillators

With device responsive to external physical condition

73763, G01N 2700

Patent

active

048433462

ABSTRACT:
A radio frequency strain monitor includes a voltage controlled oscillator for generating an oscillating signal that is input into a propagation path. The propagation path is preferably bonded to the surface of a structure to be monitored and produces a propagated signal. A phase difference between the oscillating and propagated signals is detected and maintained at a substantially constant value which is preferably a multiple of 90.degree. by changing the frequency of the oscillating signal. Any change in frequency of the oscillating signal provides an indication of strain in the structure to which the propagation path is bonded.

REFERENCES:
patent: 2862200 (1958-11-01), Shepherd et al.
patent: 3812709 (1974-05-01), Benson et al.
patent: 4014208 (1977-03-01), Moore et al.
patent: 4096740 (1978-06-01), Sallee
patent: 4269506 (1981-05-01), Johnson et al.
patent: 4363242 (1982-12-01), Heyman
patent: 4609885 (1986-09-01), Renoult
patent: 4624142 (1986-11-01), Heyman
patent: 4654520 (1987-03-01), Griffiths

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