| 摘要 |
PURPOSE:To measure the level of moisture at a high accuracy by arranging a pair of receiving horn for receiving a microwave passing through an object to be measured after projected from a transmitting horn to be a specified value of the difference in the distance thereof from the object being measured respectively to reduce the influence on variations of the sheet-shaped object being measured. CONSTITUTION:A microwave transmitted from an oscillator 1 is projected to an object 9 to be measured through an isolator 2, a waveguide 4 and a transmitting horn 3. The microwave passing through the object 9 being measured is received with receiving horn 13 and 14. The output thereof reaches to a magic T 15 via waveguides 16 and 17 and evenly distributed in the directions (a) and (b). The microwave transmitted in the direction (b) is annihilated at a non-reflection final terminal 18 while that in the direction (a) is detected by a detector section 11 and computed by an arithmetic section 12 to obtain the level of moisture. On the other hand, the receiving phones 13 and 14 are arranged at the distances l1 and l2 from the object 9 being measured to satisfy l2-l1 nlambda+lambda/4 thereby reducing variations of the object 9 being measured. |
