Observation of furnace interior
First Claim
1. A method of observing the interior of a furnace comprising viewing, at a remote location, an image depicted by a pinhole camera sited in or within the furnace housing, wherein the image is real and is viewed via a reflective or fibre optic transmission system.
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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.
26 Citations
8 Claims
- 1. A method of observing the interior of a furnace comprising viewing, at a remote location, an image depicted by a pinhole camera sited in or within the furnace housing, wherein the image is real and is viewed via a reflective or fibre optic transmission system.
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3. Apparatus for observing the interior of a furnace comprising a pinhole camera sited in or within the furnace housing and means for reproducing for viewing at a remote location the image depicted comprising elements in the camera responsive to a defined frequency spectra and an electrical signal transmission system for reproducing said image at the remote location.
- 4. Apparatus for observing the interior of a furnace comprising a pinhole camera sited in or within the furnace housing and means for reproducing for viewing at a remote location the image depicted comprising elements in the camera responsive to a defined frequency spectra and an electrical signal transmission system for reproducing said image at the remote location wherein the camera comprises an inner housing having a sealed aperture aligned with an open aperture in an outer housing and a plate disposed between said apertures in which a pinhole is defined and through which extend rays emanating from the furnace, the rays irradiating the elements mounted within the inner housing.
Specification