Observation of furnace interior
US4969035A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 15, 1989 |
| Grant date | Nov 6, 1990 |
| Priority date | — |
| Expiry date | Dec 15, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B23/2492
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.