Radiant energy – Ionic separation or analysis – Static field-type ion path-bending selecting means
Patent
1989-04-19
1990-06-05
Gonzalez, Frank
Radiant energy
Ionic separation or analysis
Static field-type ion path-bending selecting means
25022716, G02B 642
Patent
active
049308629
ABSTRACT:
An accelerometer comprises a base and cover together defining a chamber which receives an inertial mass. The diaphragm carries the inertial mass and is bolted between the base and the cover. The inertial mass and the base have facing incorrugated surfaces with offset teeth in each of the corrugated surfaces. An optical fiber is clamped between the teeth and extends between the corrugated surfaces. The intensity of light passing through the fiber changes with movement of the inertial mass with respect to the base. The inertial mass moves through the resiliency of the diaphragm, when the base is subjected to accelerations, such as those caused by vibrations. A reference optical fiber may also extend through the chamber above the inertial mass. The same light is supplied to both fibers and the intensity of light from both fibers is subtracted to leave the variation in intensity due to bending of the sensing optical fiber. Also, an electronics circuit employing a log-ratio amplifier device measures the light signals from the optical fibers and converts them to electrical signals which are proportional to the acceleration measured with the foregoing accelerometer.
REFERENCES:
patent: 4342907 (1982-08-01), Macedo et al.
patent: 4436995 (1984-03-01), Whitten
patent: 4634858 (1987-01-01), Gerdt et al.
patent: 4681395 (1987-07-01), Lindsay et al.
Davis, "An Introduction to Fiberoptic Sensors", Laser Focus 2/82, pp. 112-115.
Miers David R.
Raj David
Varshneya Deepak
Edwards Robert J.
Gonzalez Frank
Kalka Daniel S.
Matas Vytas R.
The Babcock & Wilcox Company
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