Pressure error compensation method of vibration cylinder pressure sensor under variable temperature condition

Abstract

The invention discloses a pressure error compensation method for a vibration cylinder pressure sensor under a variable-temperature condition, and belongs to the field of sensors, two temperature measuring elements are respectively mounted on a sensitive element of the vibration cylinder pressure sensor, and the temperature of the vibration cylinder pressure sensor is measured under the variable-temperature condition by respectively adjusting heat conductivity coefficients of heat-conducting media around the two temperature measuring elements. The temperature sensed by one temperature measuring element is obviously ahead of the sensitive element of the sensor, the temperature sensed by the other temperature measuring element is obviously lagged behind the sensitive element of the sensor, and the difference value of the output values of the two temperature measuring elements is used for reflecting the environment temperature change condition, so that the error of the sensor in a variable-temperature environment is compensated.

Description

technical field [0001] The invention relates to the field of sensors, in particular to a pressure error compensation method for a vibrating cylinder pressure sensor under variable temperature conditions. Background technique [0002] The vibrating cylinder pressure sensor is a high-precision pressure sensor with an accuracy level of 0.01. This type of sensor uses a metal thin-walled cylinder as a sensitive element. The measured pressure will change the natural frequency of the metal thin-walled cylinder. By collecting the natural frequency of the metal thin-walled cylinder under different pressures , and calculate the measured pressure value. Temperature changes will affect the natural frequency of the metal thin-walled cylinder, so temperature compensation of the sensor is required. Due to structural and functional limitations, the temperature measuring element cannot be in direct contact with the metal thin-walled cylinder to maintain a consistent temperature. [0003] T...

AI Technical Summary

Problems solved by technology

However, in a variable temperature environment, due to the individual differences in the structure of the sensor and the relatively discrete thermal conductivity of the thermally conductive silicone rubber of the fixed temperature measuring element used in engineering applications, it is difficult for the temperature measuring element installed outside the sensor to be completely consistent with the temperature of the metal thin-walled cylinder. When there is a difference between the temperature measured by the temperature measuring element and the temperature of the metal thin-walled cylinder, a large pressure error will occur if the sensor output frequency value measured in a variable temperature environment and the output value of the temperature measuring element are substituted into the original characteristic equation

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