| 摘要 |
<p>PURPOSE: To obtain an optical gas detector for small section which can detect gas at a remote position. CONSTITUTION: An infrared transmitting section is disposed on one side of a case 1 while a receiving section is disposed oppositely thereto on the other side and multiple vents 2 are made through the wall of the case between them thus constituting a sensor section 14. The transmitting section and receiving section at the sensor section are connected through optical fibers 6a, 6b with a detector body 15 disposed remotely therefrom. With such structure, an ideal explosion-proof performance is realized to eliminate the need of explosion-proof work, and the cost is reduced significantly by employing a convenient laying method of optical fiber. Since the sensor section comprises no aging component, e.g. a gas sensor, and has a simple constitution, stabilized performance can be sustained for a long term so long as the installation environment is clean in some degee.</p> |
