| 摘要 |
<p>PURPOSE:To reduce the influence of paper quality and steam quantity and directly output moisture percentage by irradiating a paper by use of four filters transmitting infrared rays of wavelength areas in which absorption by moisture, cellulose, the both, and steam having specified conditions. CONSTITUTION:A filter wheel 3 has filters 4, 5, 6, 6a for selectively transmitting infrared rays of specified wavelength areas. The filters 4, 5 transmit the infrared rays of the wavelength areas receiving the absorption by moisture and cellulose, respectively. The filters 6, 6a have less absorption by moisture and cellulose, and transmit the infrared rays of the same degree as the transmission wavelength area of the filter 4 or 5 in the absorption by steam. The infrared ray transmitted by each filter 4, 5, 6, 6a is successively emitted to a paper, the transmitted/scattered lights are detected by a light receiving element 10, added to sample holding circuits 12, 13, 14, 15 as alternate current signals, converted to direct current signals, and subjected to the operation by a determined equation in an arithmetic circuit 16.</p> |
