| 摘要 |
PROBLEM TO BE SOLVED: To measure a snow accumulation amount by means of a sensor using no electrical component. SOLUTION: This snow accumulation sensor 10 is constructed by spirally winding an optical fiber 2 around a supporting member 1. In the longitudinal direction of the optical fiber 2, a temperature is changed in a position 12 matching a boundary face 5 between the snow 3 and the air 4, and in the position 21, a deflection having a temperature change and linearity is generated. When a light pulse from a light pulse tester 8 is incident on one end of the optical fiber 2, a wavelength of backscattered radiation is shifted in proportion to the deflection amount. Therefore, the backscattered radiation is measured by radiating light pulse from the light pulse tester 8 to the optical fiber 2, and from the temperature change position 12 and a parameter of the spiral shape part, a snow accumulation amount is computed by a signal processing device 9. COPYRIGHT: (C)2003,JPO |
