| 摘要 |
A monitoring system for a furnace, such as one in which ceramic welding is practiced, where the temperature often exceeds 2000° F., allows substantially distortion-free, real time, monitoring. In order to monitor the furnace, a fluid cooled lance designed to be held by an operator outside the furnace has a camera (e.g. microcamera, endoscope or boroscope) mounted at the free end of the lance. An electrical connection is provided between the camera and a portable control unit mounted exteriorly of the furnace. A stationary video monitor and recorder may be mounted in the control unit, and a portable real time video monitor is mounted on the operator's headgear so that it may be seen by the operator when manipulating the lance. The lance is cooled by a water jacket having an inlet and outlet at the end of the lance exterior of the furnace, and the water jacket substantially surrounds the camera. The camera is mounted in a waterproof metal casing and the cord is covered by an aramid reinforced covering adjacent the camera. A second, sapphire, lens protects the camera lens from radiant heat, and air under pressure also helps cool the camera. |
