| 摘要 |
The moisture content of timber is measurable by irradiating the object of the measurement by fast neutrons and recording the number of resulting thermal neutrons which per unit time are attenuated by hydrogen atoms of the moisture content of the timber. However, studies have shown that there is a large difference between the effective cross section of hydrogen bound to water and hydrogen bound to wood. This fact is used to calibrate the measuring device to compensate for variations in the dry density of the timber with a satisfactory measuring accuracy. A measuring device calibrated in this manner can effectively be employed for the control of the course of drying when drying timber, such that a predetermined optimum course at all times can be followed by adjusting the parameters of drying according to the measured moisture content. |
