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.