| 摘要 |
The chamber (3) of the sensor (1) comprises a first and a second passage (16, 17) that communicate with the outside; a source of visible light (11) outside the chamber, through the first of the said passages (16), illuminates the interior of the chamber (3) and the spherical body (7) arranged inside it; an element sensitive to the quantity of light (9) outside the chamber to receive, through the second of the said passages (17), the light reflected from inside the chamber and electronic circuit that analyzes the electric signals correlated with the quantity of light seen by the said light-sensitive element (9) to generate at least one pulse that activates a movement control system of the means in which the sensor (1) is installed and an alarm system. |
