计算机解调技术在电容传感器中的应用

长期以来,电容传感器用一些调幅原理的测量仪器存在着噪声大、稳定性较差有缺点,很难进一步提高仪器的精度及频响。为此,我们提出采用计算机解调技术,即利用A/D转换,直接对调幅信号的峰值点采样完成测量信号的解调和处理的新方法,取代以往仪器中的模拟电路解调方法,并且得到了满意的实验结果。本文详细地叙述了计算机解调方法的原那、方案、实验、结论,认为这种方法可应用于各种调幅信号的解调中。

The Application of Computer Demodulation Technique in Capacitance Transducers

For a long time, capacitance transducers and some measuring instruments of amplitude-modulated signal have problems of high noise and of bad stability, and etc. As a result, it's very difficult to improve the frequency res- ponse and precision of the instrument. Therefore, a new way of the Computer Demodulation Technique (CDT) is presented to solve above problems. CDT means that the modulated signal is demodulated in the way that A/D timely samples the peaks of the amplitude- modulated signal. It can replace the Analogue Demodulation Technique (ADT) in the instrument, thus, a good experiment effect has been attained. In this paper the details on the principle, the way, the experiment and the conclusion of CDT arc introduced. The CDT technique can be used for demodulation of all amplitude-modulated signal.