Combined airtight cavity air pressure sensor calibration device

Abstract

The invention discloses a combined airtight cavity air pressure sensor calibration device comprising a baseplate which is provided with an air cylinder. An air cylinder piston rod is installed on the air cylinder. The air outlet hole of the air cylinder is provided with a four-through-hole connector. The four-through-hole connector is provided with an upper port, a lower port, a left port and a right port. The lower port is connected with the air outlet hole of the air cylinder, the upper port is provided with a hand slide valve, the left port is connected with an airtight cavity through an air pipe, the airtight cavity is internally provided with a sensor to be tested and a standard sensor, and the right port is provided with a sealing cap. The baseplate is also provided with a positioning plate. The air cylinder and the four-through-hole connector are fixedly connected with the positioning plate. The air cylinder is applied to be matched with the four-through-hole connector to be connected with the airtight cavity internally provided with the sensors to act as a pressure balance part. The airtight cavity is used for installing the sensors and also reducing the output range of the air cylinder so that the device is suitable for calibrating the air pressure sensor of low air pressure range to verify the sensitivity, the linearity, the hysteresis and other parameters, and thus the device has the characteristics of low cost and relatively high accuracy.

Description

technical field [0001] The invention relates to the field of air pressure calibration of sensors, and mainly relates to a combined air pressure sensor calibration device in a closed cavity. Background technique [0002] Sensor calibration is the process of using standard instruments with higher precision to calibrate the sensor, so as to establish the corresponding relationship between the sensor output and input. At the same time, the error relationship under different conditions of use is also determined. The basic method of calibration is to use a standard instrument to generate a known non-electric quantity as an input quantity, input it into the sensor to be tested, and then compare the output quantity of the sensor with the input standard quantity to obtain a series of standard data or curves. Determining the performance indicators of the sensor based on the test data is actually determining the measurement accuracy of the sensor. [0003] During the use of the senso...

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Problems solved by technology

[0003] During the use of the sensor, the sensitivity coefficient will change with the extension of time and the aging of electronic components. If the calibration is not changed in time, the measured data will deviate greatly and affect the measurement results.

The existing barometric pressure sensor calibration device has high cost and complicated operation

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