Development of a new type load cell for wood drying and charcoal making

研制了一种新型称重传感器作为试验。测压元件的电极采用由四个弹簧支撑的两块板。放置在称重传感器上的重物的变化引起两块板之间距离的变化。因此，两块板之间的电容发生了变化。因此，重量可能与电容有关。加热温度为120 -900℃。在30kHz-100kHz范围内，电容对交流频率和加热温度的依赖性很小。在干燥过程中，当试样重量减小时，电容量减小。在升温初期，当温度升高时，电容变化不大，而传统称重传感器的应变变化明显。

A new type load cell was manufactured as an experiment. Two plates supported by four springs were used for electrodes of the load cell. The change in a weight placed on the load cell caused the change in the distance between two plates. Consequently, an electric capacitance between two plates changed. Thus, the weight could relate to the electric capacitance. The heating temperature was 120C-900C. Dependence of the electric capacitance on frequency of an alternating current and that on heating temperature were small in the range of 30kHz-100kHz. When the weight of a specimen decreased during drying, the electric capacitance decreased. In the initial stage of heating when the temperature was rising, the electric capacitance slightly changed, while strain of a traditional load cell remarkably changed.