Snowfall sensor and snowfall strength meter

摘要

PROBLEM TO BE SOLVED: To enhance the measurement accuracy of snowfall by projecting a body for leading the light from a projecting section to the outside of a housing from the housing and leading a backscattering light from the outside of the housing to a light receiving section through a light lead-in body. ;SOLUTION: Each of a light lead-out body 4 and a light lead-in body 5 comprises an optical fiber and a pair of light lead-out bodies 4 are projected in parallel from one side face of a housing 1 while a light lead-in body 5 is projected from between. A level difference of about 2mm is provided between the lead-in end face 5a of the light lead-in body 5 and the lead-out end face 4a of the light lead-out body 4 so that the lead-in end face 5a is set back. Light is emitted from a light emitting part comprising a light emitting element 2a in the housing 1 and backscattering light from snowfrake in the air under snowfall conditions is received at a light receiving section 3 comprising a light receiving element 3a. The projecting structure of the light lead-out body 4 and the light lead-in body 5 can suppress the effect on the streamline of the wind and the detection sensitivity of snowflake is enhanced thus enhancing the measurement accuracy of snowfall.;COPYRIGHT: (C)1998,JPO