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中文摘要: 针对火药生产过程中要实时检测其含水量，设计了电容式水分检测传感器，并设计了自平衡电桥及其水分检测电路。由于要求检测的火药含水量低，约为0.5%～3%，且检测精度为0.1%，因此对影响含水量的温度、湿度、重量容积比和电压幅值等因素分别进行了研究，并根据多个参数建立了多元线性回归模型。经过大量物料实验，推导出本系统下仅与物料密度和物料重量容积比相关的通用公式，经过多次不同物料实验验证，该系统性能稳定可靠、测量准确，适合于多种物料的低含水量，高精度的快速测量。
Abstract:Aiming at gunpowder’s trace moisture real-time detection during production, a capacitive sensor, balance bridge and moisture detection circuit were designed. For the moisture content was low, about 0.5% ~ 3%, and the required accuracy was 0.1%, necessary researches about the temperature, humidity, weight volume ratio and the voltage amplitude which affecting the water content detection were performed, in the end multiple linear regression model was established. Through a large number of material experiments, a general model was deduced only relate to the material density and weight volume ratio. After different material experiments, the system is confirmed stable and reliable with measuring accuracy, it is applicable for a variety of materials of low water content and high precision fast measurement.
keywords: race moisture detection capacitive sensors multiple linear regression least square method balance Bridge
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