A temperature compensation method for hot film flowmeter
By building a Wheatstone bridge and design resistor, the problem of output signal drift of the thermal film flowmeter when the fluid temperature changes is changed, and the compensation for the lead resistance is achieved is achieved, which improves measurement accuracy.
CN115127631BActive Publication Date: 2025-03-21SUZHOU IN SITU CHIP TECH CO LTD
2 Cites 0 Cited by
Patent Information
- Application Number
- CN202110327956.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2021-03-26
- Publication Date
- 2025-03-21
- Estimated Expiration
- 2041-03-26
AI Technical Summary
Technical Problem
Thermal film flowmeter will cause the output signal to drift when the fluid temperature changes, affecting the measurement accuracy.
Method used
By building a Wheatstone bridge, combining heating thermistor and temperature measuring thermistor, and designing resistance and determining parameters such as reference temperature, overheating ratio, and expected temperature difference, compensation for the lead resistance is achieved.
Benefits of technology
The temperature difference drift caused by the heating thermistor's lead resistance changes with the fluid temperature, suppresses the drift of the output voltage with the fluid temperature, and improves the accuracy of flow measurement.
✦ Generated by Eureka AI based on patent content.
Abstract
The present invention relates to a temperature compensation method for a thermal film flowmeter, wherein the thermal film flowmeter comprises a silicon plate and a heating thermistor and a temperature measuring thermistor arranged on the fluid side surface of the silicon plate, wherein solder joints are arranged on the silicon plate, wherein the heating thermistor is connected to the corresponding solder joints via leads, wherein the leads are arranged on the fluid side surface of the silicon plate. The method comprises: S1 constructing a Wheatstone bridge, S2 designing a resistor, and S3 obtaining a voltage value U3 across the third fixed resistor when measuring the flow rate of the fluid to be detected, and compensating the output voltage U′ by U′=M·U3, wherein #imgabs0# wherein T f is the temperature measured by the temperature measuring thermistor, thereby achieving temperature compensation.
Need to check novelty before this filing date? Find Prior Art