| 摘要 |
<p>According to thss invenonon theee is provided a fibr based dew precipitation detector comprising two plascic fibres (122), the first fibre (1)is for transmitting or incoming light and the second fibre (2) is for receingng or outgoing light, a ligtt from a low power laser diode (9) is focused on to the transmitting fiber (1) through a ball lens (17) and sad light protecting from the fiber (1) is broadened through a coupling lens (7) and falls onto the surface of a polished mirror (8) and reflect light from sad mirror (8) is collected in the receiving fiber (2) through sad coupling lens (7) so that the entire light flux pass through the receiving fiber (2) and the other end of said fiber (2) carries the light radiation to the detection electronics (10) comprising a photo detector (11), amplifier sections (12,13,14), a differentrator (15) and a flip-flop to set the alarm signal (16).</p> |
