Temperature measurement method of pressure sensor

Abstract

The invention relates to the field of measurement, and in particular relates to a temperature measurement method of a pressure sensor. The temperature measurement method comprises the following steps: allowing a membrane of a piezoresistive pressure sensor to come into direct contact with a medium to collect a pressure signal and a temperature signal simultaneously; extracting a band spreading expected parameter of the temperature signal; calculating a band spreading filtering parameter based on the expected parameter; performing pointwise filtering on the temperature signal; and restoring the filtered data of the temperature signal to a data storage module. According to the invention, collection and measurement of a temperature and a pressure are completed simultaneously using a single sensor, and compared to a traditional temperature measurement scheme with a downhole pressure gauge, more rapid temperature sensing is achieved, and the synchronism of temperature measurement and pressure measurement is ensured. The membrane of the piezoresistive pressure sensor comes into direct contact with a surrounding medium, thereby ensuring the heat conduction efficiency in temperature measurement. Digital filtering is performed on the temperature signal, thereby expanding the temperature measurement frequency band and improving the temperature measurement capability to a pressure gage having high thermal inertia.

Description

technical field [0001] The invention relates to the measurement field, in particular to a pressure sensor temperature measurement method. Background technique [0002] For the field of downhole electronic downhole pressure gauges in oil and gas fields, the pressure gauges at home and abroad all need to measure the pressure quickly and accurately at the same time. [0003] Existing schemes for manometers to measure temperature all use independent temperature sensors. The temperature sensors are either set inside the manometer or integrated in the front probe. The temperature sensor is set on the internal circuit of the metal cavity of the pressure gauge. The external heat change needs to pass through the heat conduction of the medium and the pressure gauge shell, and the heat radiation of the air inside the shell can reach the temperature sensor. The temperature measurement requires heat conduction, and the induction lags; the temperature sensor Integrated with the front pro...

AI Technical Summary

Problems solved by technology

The temperature sensor is set on the internal circuit of the metal cavity of the pressure gauge. The external heat change needs to pass through the heat conduction of the medium and the pressure gauge shell, and the heat radiation of the air inside the shell can reach the temperature sensor. The temperature measurement requires heat conduction, and the induction lags; the temperature sensor Integrated with the front probe, temperature and pressure measurements still have asynchronous measurement, which affects the temperature drift correction accuracy of pressure

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