Optics: measuring and testing – By polarized light examination – With light attenuation
Patent
1983-12-13
1987-11-24
Rosenberger, R. A.
Optics: measuring and testing
By polarized light examination
With light attenuation
356381, 250214B, G01B 1102, F27D 116
Patent
active
047084820
ABSTRACT:
A continuous wave laser light beam is directed at the refractory lining within a furnace vessel, and the displacement as measured by a self-scanned linear array of the scattered light beam from a nominal or reference position measured to provide an indication of lining wear or damage. The video signal received by the linear array receiver provides information for mapping the worn or damaged areas of the vessel lining so that such areas may be repaired by a gunning spray nozzle. The inspection apparatus includes an optical filter which is temperature controlled to prevent wavelength shifts away from the nominal laser wavelength. The electronic processing circuitry includes a voltage controlled oscillator responsive to the average background level for modifying the scan rate of the linear array to compensate for changes in background level. The threshold against which the reflected laser beam video signal is compared is also a function of background level. Consequently, the system is self-compensating for changes in background radiation temperature. The apparatus may be lowered into a hot furnace vessel following each heat without the need to cool the furnace vessel. The inspection apparatus is mechanically scanned vertically and angularly within the vessel to provide a large number of inspection data points.
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patent: 4373805 (1983-02-01), Mallinson
AGA IMS 1600 Measuring System Description.
Armco Inc.
Rosenberger R. A.
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