| 摘要 |
Security system, comprising: a transmitter for transmitting radiation in a wavelength range in the order of magnitude of about 630-660 nm; a cable permeable to the radiation which is connected to the transmitter and has a thickness in the order of magnitude of 0.5-1 mm; and a receiver for receiving the radiation passed through the cable, which is connected to the cable; and means for adjusting the degree of sensitivity of the cable. |
