一种新型气体流量测定仪的设计

摘要

This paper presents a new gas flow measurement system, which works by calorimetric sensors and DSP wavelet transform signal processing.The system is achieved by specific hardware including flow sensors, voltage amplifier, A / D converter, DSP, heat control circuits as well as supporting software and algorithm.The main advantages of the scheme include its high precision, stable performance and high noise rejection.It can be applied to especially under small tidal volume and low-flow conditions.%基于新型量热式传感器和DSP小波变换信号处理的工作原理,设计了一种新型的气体流量测定系统.该系统通过流量传感器、电压放大器、A/D转换器、数字信号处理器、热源控制电路等硬件电路和配套软件及算法来实现.设计具有精度高、性能稳定和较高的噪声抑制等优点,特别适用于小潮气量低流速条件下的测量.