G - Physics – 01 – L
Patent
G - Physics
01
L
325/1, 73/57
G01L 9/00 (2006.01) G01D 5/26 (2006.01) G01F 23/292 (2006.01)
Patent
CA 1108430
Abstract of the Disclosure An optical measurement system, e.g. for remote telemetering, eliminates the influences of time variations on light sources, transmission lines, photo detectors etc. A pair of light sources generates two pulse-shaped optical signals of different wavelengths. A portion of each of these signals is sent to a remote measuring location by an optical fiber. Here, a change in the state of the object being observed is converted into a variation in the quantity of light trans- mission, and the resulting optical signal is returned to the signal processing portion of the system also by an optical fiber. This varied optical signal is then converted into an electric signal by a photo detector. Other portions of the original optical signals from the light sources are converted into a second electric signal by another photo detector. The ratio between the first and second electric signals is amplified by a logarithmic amplifier, and the amplified signal is passed through a sampling circuit and a synchronous detector to find the quantity of change of the measured object.
320563
Kita Shin
Maeda Minoru
Minai Yasuo
Onoda Seiichi
Tanaka Mitsuo
Hitachi Ltd.
Kirby Eades Gale Baker
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