How to improve the stability of pressure sensor?

Here are some ways to improve the stability of pressure sensors:

optomize design

Reasonable selection of materials: according to the use environment and requirements of the sensor, choose materials with suitable performance. For example, the pressure sensor used in high temperature environment should be made of materials with high temperature resistance and low thermal expansion coefficient to reduce the influence of temperature on measurement accuracy; For corrosive environment, corrosion-resistant materials should be selected to ensure the long-term stability of the sensor.

Change to structural design: adopting reasonable structural design can enhance the stability of the sensor, increase the stiffness and strength of the elastic element, so that it is not easy to deform or break under pressure; optimize the connection mode between the sensitive element and the elastic element to ensure signal transmission.

Stability and accuracy.

Improve the manufacturing process and improve the machining accuracy: Accurate machining process can ensure the dimensional accuracy and shape accuracy of each component of the sensor, thus improving the consistency and stability of the sensor. For example, using high-precision machining process to manufacture the chip of MEMS pressure sensor can effectively control the thickness and size of the chip and improve the performance of the sensor.

Strengthen packaging technology: Good packaging can protect the sensitive components inside the sensor from the external environment, such as dust, moisture, chemicals and so on. Choosing suitable packaging materials and methods, such as metal packaging or ceramic packaging with good sealing, can improve the anti-interference ability and long-term stability of the sensor.

Perform calibration and compensation.

Periodic calibration: In the process of use, the pressure sensor may be affected by various factors, resulting in measurement errors, so it is necessary to conduct periodic calibration. For calibration, the standard pressure source can be used to calibrate the sensor, determine its measurement errors and make adjustments to ensure the accuracy of the sensor.

Accuracy and stability.

Temperature compensation: Temperature is one of the important factors affecting the stability of pressure sensor, and the influence of temperature on the sensor output can be reduced by temperature compensation technology. The common temperature compensation methods include hardware compensation and software compensation. The hardware compensation usually adopts temperature sensitive elements such as thermistor and thermocouple to integrate with the sensor to monitor the temperature change in real time and compensate. Software compensation is to establish a mathematical model between temperature and sensor output, and use software algorithm to correct the measurement results.

Zero drift compensation: Zero drift refers to the phenomenon that the output signal of the sensor is not zero when there is no pressure input. The stability and accuracy of the sensor can be maintained by regularly detecting the zero output of the sensor and compensating the zero drift by using software or hardware methods. Adopt stability improvement technology

Pulsating fatigue test: a certain number of pulsating hydraulic stress tests on the pressure sensor can increase the aging and stability of the internal materials of the sensor, thus improving its long-term invisibility. During the testing process, the stress inside the sensor is relieved by applying periodic pressure changes.

Release and redistribution, reduce the performance degradation caused by material fatigue. Hot and cold cycle test: The hot and cold cycle test can model the working state of the sensor in different temperature environments. Through multiple rapid heating and warming processes, the materials and structures inside the sensor generate thermal stress, thus accelerating the aging and stability of the materials. After the hot and cold cycle test, the performance of the sensor will be more stable and can maintain good consistency under different temperature conditions.

Vibration aging treatment: vibration aging treatment is a method to release and homogenize the residual stress in the sensor by applying vibration with a certain frequency and amplitude to the sensor. This method can effectively improve the anti-vibration ability of the sensor and reduce the measurement caused by vibration.

Quantity error and performance instability.

Pay attention to the use and maintenance of correct installation: when installing the pressure sensor, it should be carried out in strict accordance with the operating procedures to ensure that the sensor is installed accurately and firmly in the country, so as to avoid additional stress or vibration caused by improper installation and affect the stability of the sensor. At the same time, we should pay attention to the connection mode between the sensor and the measured medium to ensure good sealing and prevent leakage.

Avoid overload: during use, avoid the pressure sensor from bearing pressure exceeding its rated range, so as to avoid damage or performance degradation of the sensor. If it is necessary to measure the pressure in a large country, you can choose a sensor with a suitable range or use a combination of multiple sensors.

Regular maintenance: check, clean and maintain the pressure sensor regularly, and find and eliminate hidden troubles in time. For example,

Check whether the appearance of the sensor is damaged, whether the connection line is loose, and whether the power supply is normal; Clean the dust and dust on the sensor surface.

Dirt, keep its good heat dissipation conditions. Shenzhen Kaidechang Electronic Technology Co., Ltd. is a professional manufacturer of high-quality and high-precision load cells. The main products include more than 1,000 kinds of force control products, such as micro tension and pressure sensors, pull-rod tension and pressure sensors, S-type tension and pressure sensors, ring sensors, column sensors, shaft pin sensors, weighing sensors, multi-axis force sensors, torque sensors, micro displacement sensors, pressure transmitters (wave pressure sensors), transmitters/amplifiers, control instruments, hand-held instruments, etc., and have obtained many national exclusive benefits; Products are widely used in more than 10 new and intelligent high-end fields, including industrial automation production lines, 3℃, new energy, robots, machinery manufacturing, medical care, textiles, automobiles, metallurgy and transportation. Product technology continues to innovate and new product research and development capabilities are strong.