AC type flowmeter and method of mapping flow rate data for the same

摘要

The present invention relates to a flowmeter suitable for a micro flow sensor. The flowmeter of the present invention comprises a resistive heater to be inserted into a fluid, AC power with a first frequency supplied to the resistive heater to periodically heat the resistive heater, a signal processing unit for detecting a first signal from the resistive heater in relation to a temperature variation of the resistive heater by the AC power, and obtaining a phase lag of the first signal relative to the heat generation in the resistive heater, and an operation unit for calculating a flow rate based on the obtained phage lag. According to the present invention, the flowmeter of the present invention has a wide measurement range and high measurement accuracy with a simple structure.