| 摘要 |
PURPOSE:To enable measurement of the attenuating rate of a mu wave by packing granular solid in a sample box to a uniform thickness, placing the sample box between two sets of mu wave oscillators and receivers and making the spacing between one transmitter and receiver larger by a specified distance than the spacing between the other transmitter and receiver. CONSTITUTION:A sample is packed into a square sample box 4 and the 2nd electromagnetic horn 5 for signal transmission is disposed below the sample box 4 placed between the 1st electromagnetic horns 2 and 3 for transmission and reception installed at a specified spacing D1. The 2nd electromagnetic horn 6 for reception is disposed above the box 4 and the spacing between the horns 5 and 6 is made D2 by shifting the spacing D2 between the horn 5 and the horn 6 by the distance (d) corresponding to 1/4 wavelength of the microwave used, i.e., 1/2 wavelength of the standing wave from the spacing D1 between the horn 2 and the horn 3. A phase deviation is offset and error is eliminated if the detected voltages of the horns 3, 6 are added. The moisture content of nonuniform granular solid is thus measured and the variance in the measured value is decreased. |
