WATER CONTENT SENSOR AND ROAD SURFACE STATE DETECTION DEVICE

WATER CONTENT SENSOR AND ROAD SURFACE STATE DETECTION DEVICE

A water content sensor (1) includes: a light emitter (20) that emits detection light having a first wavelength band and reference light a second wavelength band toward a road surface (S); a first light receiver (33) that converts the detection light reflected by the road surface (S) to a first elect...

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Hauptverfasser: HAYASHI Masanori, YASUIKE Noriyuki, BABA Toru, NAKAGAWA Takashi, MATSUNAMI Hirotaka, WATABE Yoshifumi
Format: Patent
Sprache:eng ; fre ; ger
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INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES
MEASURING
METEOROLOGY
PHYSICS
TESTING
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creator HAYASHI Masanori
YASUIKE Noriyuki
BABA Toru
NAKAGAWA Takashi
MATSUNAMI Hirotaka
WATABE Yoshifumi
description A water content sensor (1) includes: a light emitter (20) that emits detection light having a first wavelength band and reference light a second wavelength band toward a road surface (S); a first light receiver (33) that converts the detection light reflected by the road surface (S) to a first electric signal; a second light receiver (43) that converts the reference light reflected by the road surface (S) to a second electric signal; and a computation processor (56) that detects the amount of water based on a signal ratio between the first electric signal and the second electric signal. The computation processor (56) detects the amount of water based on the signal ratio obtained when the signal intensity of at least one of the first electric signal and the second electric signal is within a predetermined range defined relative to a reference value.
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subjects INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES
MEASURING
METEOROLOGY
PHYSICS
TESTING
title WATER CONTENT SENSOR AND ROAD SURFACE STATE DETECTION DEVICE
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