Intelligent gas pressure sensor and zero point calibration method thereof

Abstract

The invention relates to an intelligent gas pressure sensor and a zero point calibration method thereof. The pressure sensor comprises a circuit board, a sensor diaphragm, a pressure detection air passage and a ventilation air passage, the sensor diaphragm is arranged on the circuit board, the ventilation air passage and the pressure detection air passage act on the front and back sides of the sensor diaphragm respectively, the pressure detection air passage is provided with a three-way valve, the end close to the air inlet end of the pressure detection air passage serves as the first end of the three-way valve, the end far from the air inlet end of the pressure detection air passage serves as the second end of the three-way valve, the third end of the three-way valve is connected with theventilation air passage, the three-way valve is electrically connected with the circuit board, in a first work state, the first end of the three-way valve is closed and the second end is communicatedwith the third end, and in a second work state, the third end of the three-way valve is closed and the second end is communicated with the first end. The three-way valve is arranged additionally, thegas pressure sensor can implement zero calibration autonomously, zero point errors are avoided from accumulation, and the problem of zero point drift of the gas pressure sensor is solved.

Description

technical field [0001] The invention relates to the technical field of metering and testing, in particular to a gas pressure sensor and a zero point calibration method thereof. Background technique [0002] Gas pressure sensors are widely used in industrial production, such as pipeline pressure, wind speed detection, unmanned aerial vehicle systems and so on. Due to the influence of the complex and changeable environment, the pressure sensors used in these fields need to work for a long time and uninterruptedly, and the long-term stability of the pressure sensors is greatly restricted. The core component of the pressure sensor product is the sensor diaphragm, which is a semiconductor pressure diaphragm. The pressure to be detected is transmitted to the semiconductor pressure diaphragm through the carrier, and the resistance changes according to the pressure of the semiconductor pressure diaphragm, and then through the electronic The circuit works to realize the output that ...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide an intelligent gas pressure sensor and its zero point calibration method, especially the intelligent calibration method of the gas pressure sensor in the atmospheric environment, which can effectively solve the inaccurate measurement caused by the zero point drift of the gas pressure sensor during use question

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