| 摘要 |
<p>A light sensor (2) remote from the illuminated region (18) measures the total lighting intensity (E). On exceeding an adjustable limit, The lighting installation (14) is switched off. On falling below it, the installation is switched on, or is controlled to a given value. A transmitter (24) emits measurement signals (26) incident on the illuminated region (18). These are reflected to selective receivers (30, 22). The transmitted (26) and reflected signals (28) are compared, to determine a correction factor. This is evaluated using a given calibration curve, to correct the measured lighting intensity (E). Should this depart from a given lighting intensity (E 0), the intensity of the lighting installation is automatically raised or lowered. An independent claim is included for the corresponding control system.</p> |
