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Dry goods summary: Four unavoidable errors of pressure sensors
Category:
Relevant sensor technology papers
Publish Time:
2020-07-08
1. Linearity Error: This is a factor that has a relatively small impact on the initial error of the pressure sensor. This error is caused by the physical nonlinearity of the silicon wafer, but for sensors with amplifiers, the nonlinearity of the amplifier should also be included. The linearity error curve can be a concave curve or a convex curve for weighing sensors.
When selecting a pressure sensor, we need to consider its overall accuracy. What factors can cause errors in the accuracy of a pressure sensor? In fact, there are many factors that cause sensor errors. Below, we will focus on four unavoidable errors, which are the initial errors of the sensor.
1. Linearity Error: This is a factor that has a relatively small impact on the initial error of the pressure sensor. This error is caused by the physical nonlinearity of the silicon wafer, but for sensors with amplifiers, the nonlinearity of the amplifier should also be included. The linearity error curve can be a concave curve or a convex curve for weighing sensors.
2. Offset Error: Since the pressure sensor maintains a constant vertical offset across the entire pressure range, variations in transducer diffusion and laser adjustment correction will produce offset errors.
3. Sensitivity Error: The magnitude of the error is proportional to the pressure. If the device's sensitivity is higher than the typical value, the sensitivity error will be an increasing function of pressure. If the sensitivity is lower than the typical value, then the sensitivity error will be a decreasing function of pressure. This error is caused by variations in the diffusion process.
4. Hysteresis Error: In most cases, the hysteresis error of a pressure sensor can be completely ignored because the silicon wafer has very high mechanical stiffness. Hysteresis error only needs to be considered in situations with large pressure changes. These four errors in pressure sensors are unavoidable. We can only choose high-precision production equipment and utilize advanced technologies to reduce these errors. We can also perform some error calibration during manufacturing to minimize errors and meet customer needs.
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