A temperature compensation method of hot film shear stress sensor based on constant current drive
A temperature compensation, constant current drive technology, applied in the direction of instrument, force/torque/work measuring instrument calibration/test, measurement device, etc., can solve the problems of affecting the heat dissipation of the working resistance, not being practically available, and resistance deviation.
Active Publication Date: 2022-04-19
西北工业大学太仓长三角研究院
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Problems solved by technology
[0005] In the prior art, many methods based on the temperature compensation model under the constant temperature driving mode to realize the temperature compensation of the hot film shear stress sensor have been proposed; however, the temperature compensation based on the hot film shear stress sensor under the constant current driving mode has not yet Practical solution; this is because when the hot film shear stress sensor based on constant current drive is working, the change of fluid temperature will affect the heat dissipation of the working resistor, causing the resistance value to deviate, thus affecting the output voltage of the sensor
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[0031] The present invention will be described in further detail below in conjunction with specific examples, but the embodiments of the present invention are not limited thereto.
[0032] In order to realize the temperature compensation based on the hot film shear stress sensor in the constant current driving mode, an embodiment of the present invention provides a temperature compensation method based on the constant current driving hot film shear stress sensor. Such as figure 1 As shown, the method may include the following steps:
[0033] S10: According to the linear relationship expression between the temperature and resistance of the thermistor in the sensor, transform the fluid temperature into an equivalent thermistor, construct the expression of the fluid temperature, and use the linear relationship expression to reconstruct the working resistance of the sensor The expression of and the expression of temperature difference.
[0034] Among them, the temperature differ...
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The invention discloses a temperature compensation method for a thermal film shear stress sensor driven by constant current, comprising: transforming the fluid temperature into an equivalent thermistor according to the linear relationship expression between the temperature and the resistance value of the thermistor in the sensor , construct the expression of fluid temperature, and use the linear relationship expression to reconstruct the expression of working resistance and the expression of temperature difference; substitute the obtained expression and the relationship between output voltage and working resistance into the formula of shear stress and thermal power , obtain the initial temperature compensation model; transform the model to obtain the temperature compensation model of the relationship between the output voltage and the fluid wall shear stress, and make temperature compensation for the output voltage of the thermal film shear stress sensor according to the temperature compensation model; The invention realizes the temperature compensation of the hot film shear stress sensor based on the constant current driving mode, and can compensate the error of the output voltage caused by the temperature change in a large range, so that the sensor error is small.
Description
technical field [0001] The invention belongs to the technical field of temperature compensation of a shear stress sensor, in particular to a temperature compensation method of a hot film shear stress sensor driven by constant current. Background technique [0002] The frictional resistance of various water, land and air vehicles during high-speed operation accounts for 50%-80% of the total resistance, and the frictional resistance is closely related to the speed, energy consumption, carrying capacity and maneuverability of the aircraft. The shear stress of the fluid wall is an important parameter to accurately express the friction resistance and describe the flow state of the fluid boundary layer. Fluid wall shear stress refers to the tangential stress generated on the wall due to the viscosity of the fluid when the fluid flows through the wall. At present, the measurement of wall shear stress plays an important role in the drag reduction of large aircraft and the noise red...
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IPC IPC(8): G01L25/00
CPCG01L25/00
Inventor 毕珍袁平秋常莹严宇超
Owner 西北工业大学太仓长三角研究院