METHOD FOR DECISION OF VISUAL RANGE, AMOUNT OF PRECIPITATION AND KIND OF PRECIPITATION AND APPARATUS FOR EXECUTING THE SAME BY COMBINING VISUAL-RANGE MEASURING DEVICE WITH AMOUNT-OF-PRECIPITATION MEASURING DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a method and an apparatus wherein various phenomena such as fog, rain, snow and the like can be discriminated satisfactorily. SOLUTION: A first receiver (2) is arranged so as to face a light transmitter (1). A second receiver (3) is arranged in a range at a forward scattering angle of 20 to 40 deg., a third receiver (4) is arranged in a range at a forward scattering angle of 70 to 120 deg., and a fourth receiver (5) is arranged in a range at a forward scattering angle of 140 to 150 deg.. A modulation oscillator (15) is installed on the upstream side of the light transmitter (1). The respective receivers (2, 3, 4, 5) are connected to an electronic evaluation device (33) through postamplifiers (6, 7, 8, 9) and synchronous rectifiers (10, 11, 12, 13).