Optics: measuring and testing – For optical fiber or waveguide inspection
Patent
1985-08-16
1988-06-28
McGraw, Vincent P.
Optics: measuring and testing
For optical fiber or waveguide inspection
250227, 356318, 356435, 356448, G01N 2164, G01N 2131, G01N 2149, G01N 2155
Patent
active
047535300
ABSTRACT:
An optical measuring system for measuring in situ by means of one or more fiber-optic probes reflection absorption fluorescence, phosphorescence and turbidity of a fluid or (for all but the last measurement) of a fluid-solid interface. High intensity pulsed light is conveyed to the measurement site by a fiber-optic cable and is given a specific direction at the site by means of the geometry of the probe, reaction light resulting from the stimulating light pulse is discriminated by the geometry of the probe, or another probe, and is returned via a further fiber-optic cable to a measurement system which is enabled to sense the returning light only for the duration of the light pulse. The measurement system comprises means for sensing the relative intensity of the stimulating light pulse and for deriving a signal at least representative of the ratio of the magnitude of the quality sensed, by means of the probe, and the relative intensity of the stimulating light pulse. In one embodiment a unitary probe has three light channels, one conveying light to the site, one conveying light to the measurement system at least representative of the stimulating light intensity at the side and the last providing to the measurement system a signal representative of the magnitude of the quality of interest.
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Griffiths David
Knight John H. G.
McGraw Vincent P.
Oriel Scientific Ltd.
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