热线风速仪由于检则元件小、热惯性小、灵敏度及空间分辨力高、对流态干扰小、能用于测量动态随机变量,是目前分析流体内部时空变化方面最为合适的量测仪器之一.本文阐述热线风速仪的理论基础、探针构造、主机与系统设计,以及性能指标等等. Hot wire anemometer is one of the most suitable measuring instruments for analyzing the spatio-temporal variation of fluid at present due to its small size, small thermal inertia, high sensitivity and spatial resolution, small disturbance to flow regime and can be used to measure dynamic random variables. This paper describes the theoretical basis of hot wire anemometer, probe structure, host and system design, and performance indicators and so on.