1. Single-capacitance pressure sensor.
A single capacitance pressure sensor is a kind of pressure sensor based on the principle of capacitance, and its structure is relatively simple. It usually consists of a fixed electrode and a movable electrode, and when external pressure acts on the movable electrode, the electrode displaces, causing the capacitance value to change between the electrodes. By measuring this change in capacitance value, the magnitude of the pressure can be derived.
The advantages of a single capacitance pressure sensor include simple structure, low cost, and ease of manufacture. In addition, because its working principle is based on the capacitance principle, it has good linearity and sensitivity, which can meet the needs of some low-precision pressure measurements. However, the disadvantages of single-capacitance pressure sensors are also obvious, such as high temperature influence, poor long-term stability, and limited measurement range.
2. Differential pressure sensor.
The differential pressure sensor is a kind of pressure sensor based on the strain principle, and its structure is relatively complex. It usually consists of an elastic sensitive element and one or more strain gauges. When an external pressure is applied to an elastic sensitive component, the element deforms, resulting in a change in the resistance value of the strain gauge. By measuring this change in resistance value, the magnitude of the pressure can be derived.
The advantages of differential pressure sensors include high measurement accuracy, good stability, low temperature influence, and wide measurement range. In addition, since its operating principle is based on the strain principle, good linearity and sensitivity can be achieved in both high and low pressure ranges. However, the disadvantages of differential pressure sensors are also obvious, such as high cost, complex manufacturing process, and the need for calibration.
3. Summary and comparison.
In summary, there are significant differences between single-capacitance pressure sensors and differential pressure sensors in terms of structure, operating principle, performance, and application. Single-capacitance pressure sensors have the advantages of simple structure, low cost, and easy manufacturing, and are suitable for some low-precision pressure measurement needs; The differential pressure sensor has the advantages of high measurement accuracy, good stability, low temperature influence, and wide measurement range, and is suitable for high-precision and high-stability pressure measurement requirements. In practice, it is necessary to select the right sensor type according to the specific needs and scenarios.