Design of hot-film air flow sensor based on method of constant temperature

Based on the method of constant temperature,a type of new hot-film gas flow sensor is designed.The process of modeling and the structural design of its sensitive components are introduced,and the detailed design of the sensor is given.Simulation and experimental results show that the flow sensor is either sensitive to small traffic signal or fit for the measurement of large traffic signal,whose power comsumption approaches 0.1 W,response time is less than 50 ms,accuracy is 0.6 %FS,and can satisfy the technical specification request,such as low-power consumption,fast response,high accuracy etc.