| 摘要 |
PROBLEM TO BE SOLVED: To improve resistance to disturbance light at a certain frequency.SOLUTION: A light projection unit 100 emits pulse light with non-equal pulse intervals. Signal light emitted by the light projection unit 100 is pulse light, and a light projection pattern with non-equal intervals is employed in which a first pulse interval of 40 μ seconds and a following second pulse interval of 38 μ seconds are mixed one after another. A light reception unit 200 searches light reception signal data sequentially stored in a buffer memory 208 for a pulse set of the light projection pattern, and determines whether the received light is signal light from the light projection unit 100 or disturbance light. |
