Observation of furnace interior

Details Observation of furnace interior Observation of furnace interior

1989-12-15

1990-11-06

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358229, 358901, H04N 718

Patent

active

049690353

ABSTRACT:
This invention provides a method of observing the interior of a furnace by viewing, at a remote location, the image depicted by a pinhole camera sited in or within the furnace housing. The image may be real and viewed directly or via a reflective or fibre optic transmission system, or alternatively a video camera may be employed, in this instance the `screen` of the camera may be constituted by light responsive elements, e.g. charge coupled devices. The camera may typically be sited in the furnace wall or roof and a pressurized blast of air or an inert gas, e.g. nitrogen or argon, may be employed for maintaining the integrity of the pinhole.

REFERENCES:
patent: 3609236 (1971-09-01), Hellman
patent: 4022530 (1977-05-01), Braun
patent: 4112763 (1978-09-01), Pirlet
patent: 4432286 (1984-02-01), Witte
patent: 4539588 (1985-09-01), Ariessohn
patent: 4749171 (1988-06-01), Arima et al.
patent: 4820046 (1989-04-01), Sohma

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