Through flame optical viewing

Details Through flame optical viewing Through flame optical viewing

1987-01-30

1988-12-27

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358101, 358107, 250253, 350311, 350258, H04N 718

Patent

active

047944528

ABSTRACT:
A method and apparatus for illuminating a target, for example the wall and internal structures of a coal, oil, or gas fired combustion chamber for remote viewing. A coherent light source is used to illuminate the target with illumination of a selected spectral content different from that produced by ambient light resulting from the combustion of the fuel. The coherent light illuminates the target and a narrow band optical filter is placed in front of a viewing camera to filter ambient light but to pass the illuminating source reflected from the target. The coherent light source has a wavelength range of about 422 nm to about 780 nm. Source wavelengths are chosen to be sufficiently long to penetrate particulate laden gases and still be distinguishable from thermal radiation inside the furnace. A human observer may manipulate the laser source and view the target using filter spectacles.

REFERENCES:
patent: 3718758 (1973-02-01), Ponghis et al.
patent: 4084188 (1978-01-01), Gorg et al.
patent: 4225771 (1980-01-01), Justice et al.
patent: 4525462 (1985-01-01), Behr
patent: 4539588 (1985-01-01), Ariessohn et al.
"Encyclopedia on Cathod-Ray Oscilloscopes and Their Uses", Rider et al., 1959 second edition, p. 4-4.

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