Online calibration system and method for system pressure sensor

By designing an online calibration system for the system pressure sensor, including a process system and a measurement and control system, online calibration of the pressure sensor without disassembling it is achieved, which solves the problem that the system pressure sensor cannot be calibrated online in the existing technology and improves the stability and accuracy of the measurement system.

CN120685248APending Publication Date: 2025-09-23SHANGHAI INST OF SPACE PROPULSION
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Patent Information

Application Number
CN202510753519.5
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-06-06
Publication Date
2025-09-23

AI Technical Summary

Technical Problem

Existing technologies are unable to achieve online calibration of the system's pressure sensors, which affects the continuous stability and accuracy of the measurement system. Especially in complex scenarios where multiple channels work together, the measurement deviation of a single sensor may trigger a cascade effect.

Method used

An online calibration system for system pressure sensors is designed, which includes a process system, a measurement and control system, and the system to be calibrated. The process system, which is composed of a high-pressure gas cylinder, a pressure gauge, a hand valve, a pressure reducing valve, a filter, and a pressure sensor, is combined with a measurement and control system, which is composed of a lower computer, a communication module, an analog output module, a digital output module, and an analog-to-digital conversion module, to achieve online calibration of the pressure sensor without disassembling it.

Benefits of technology

It realizes online calibration without removing the pressure sensor in the system, reducing workload, avoiding system damage, and improving work efficiency. It has precise control and a high degree of automation. It is suitable for systems with different local pressures and can calibrate multiple standard pressure sensors.

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Abstract

The invention provides an online calibration system and method for a system pressure sensor. The system pressure sensor does not need to be disassembled, the pressure in the system pipeline is adjusted by means of the valve and the adjusting valve, meanwhile, the high-precision standard sensor is used for monitoring the pressure value, electric signals output by all the pressure sensors in the calibrated system are recorded, and by repeating the operation at different pressure points, the calibration accuracy is improved. And recording combined data of multiple groups of pressure and electric signals, and processing the data to finally obtain a verification curve and uncertainty. According to the method, the workload is effectively reduced, system damage caused by repeated disassembly is avoided, the working efficiency is remarkably improved, and the method has a wide application prospect.
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