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用微波方法测量非电量比起传统方法来具有快速、精度高、抗干扰能力强、不接触和不破坏被测物的优点,所以更适合在快速运转的生产线上使用.纸张主要是植物纤维构成.植物纤维在干燥情况下的介电常数在2～4左右,而水在微波频段的介电常数约为50～81.因此,纸的含水量变化明显地反映在其介电常数的变化上.直接精确测量纸张对微波谐振腔频率的微扰有很大困难.其一是纸张含水量变化对腔频
Compared with the traditional method, the non-electricity measurement by the microwave method has the advantages of fastness, high precision, strong anti-interference ability, no contact and no damage to the measured object, so it is more suitable for use in the fast running production line. The paper is mainly composed of plant fibers The dielectric constant of plant fibers is about 2 to 4 in dry conditions, and the dielectric constant of water in the microwave frequency range is about 50 to 81. Therefore, the change in water content of paper is clearly reflected in the change of its dielectric constant It is very difficult to directly and accurately measure the perturbation of the paper on the frequency of the microwave cavity. One is the change of the water content of the paper to the cavity frequency