Sound wave type moisture content sensor

Abstract

Abstract PURPOSE:To measure an average moisture content by placing a material to be measured between a sound wave transmitter and receiver and measuring the velocity of the sound wave propagating in the material to be measured. CONSTITUTION:The material 12 to be measured is inserted between the transmitter 4 and the receiver 5. The sound velocity in the material 1 is determined at this time by measuring the time difference between a peak pulse obtd. by converting the signal wave prior to transmission and a peak pulse obtd. by converting the signal wave after the reception by a time difference measuring circuit 9. The data on the time difference is converted to the data on the moisture content by a time difference-moisture content conversion circuit 10. The need for bringing the sensor into tight contact with the material to be measured is thereby eliminated and the measurement of the average moisture content of the material to be measured having a locally nonuniform moisture content distribution is permitted.

Inventors

• 👤 Hirotsugu Kawamoto
• 👤 河本　洋次
• 👤 Hiroshi Maemori
• 👤 前森　啓

Bibliographic Details