Application principle of pressure sensor

1. Variety

There are many kinds of mechanical sensors, such as resistance strain gauge pressure sensor, semiconductor strain gauge pressure sensor, piezoresistive pressure sensor, inductive pressure sensor, capacitive pressure sensor, resonant pressure sensor and capacitive acceleration sensor. But the most widely used is the piezoresistive pressure sensor, which has a very low price, high accuracy and better linear characteristics.

2. Understanding

In the decompression resistance pressure sensor, we first understand the resistance strain gauge this element. The resistance strain gauge is a sensitive device that converts the strain change on the measured part into an electrical signal. It is one of the main components of piezoresistive strain sensor. The most widely used resistance strain gauges are metal resistance strain gauges and semiconductor strain gauges. There are two kinds of metal resistance strain gauge: wire strain gauge and metal foil strain gauge. Usually, the strain gauge is tightly bonded to the mechanical strain matrix by a special bonding agent. When the stress of the matrix changes, the resistance strain gauge also deforms, so that the resistance value of the strain gauge changes, and the voltage applied to the resistance changes. The resistance value of this strain gauge is usually small when it is stressed, and this strain gauge is generally composed of A strain bridge, and is amplified by a subsequent instrument amplifier, and then transmitted to the processing circuit (usually A/D conversion and CPU) display or executive mechanism.