| 摘要 |
FIELD: burglar alarm devices applicable in guarding of various objects. SUBSTANCE: burglar alarm device includes radiation source, optical divider, two deflectors, deflector drive, two pairs of identical spherical reflectors, two radiation receivers, unit for data processing and presentation. The principle of operation is based on formation by means of the above specified members of the fence - detection boundary in which the main optical axes of two pairs of spherical reflectors are crossed at definite angle to create thus the three sections of trespasser detection:central, left-hand and right-hand from the central one. Crossing of the detection sections is registered by the respective radiation receivers and presented on the information board. EFFECT: higher accuracy in determination of the place of trespassing. |
