| 摘要 |
<p>A monitoring system for a furnace (5), 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 (10) designed to be held by an operator outside the furnace has a camera (13) (e.g. microcamera, endoscope or boroscope) mounted at the free end (12) of the lance. An electrical connection (18) is provided between the camera and a portable control unit (20) mounted exteriorly of the furnace. A stationary video monitor (25) and recorder (26) may be mounted in the control unit (20), and a portable real time video monitor (28) is mounted on the operator's headgear (27) so that it may be seen by the operator when manipulating the lance. The lance is cooled by a water jacket (14) having an inlet (15) and outlet (16) at the end of the lance exterior of the furnace, and the water jacket (14) substantially surrounds the camera. The camera is mounted in a waterproof metal casing (30) and the cord (18) is covered by an aramid reinforced covering adjacent the camera. A second, sapphire, lens (33) protects the camera lens (31) from radiant heat, and air under pressure also helps cool the camera.</p> |
