resistivatryckbaserade

Resistivity-based pressure sensors, often referred to as piezoresistive sensors, are transducers that convert mechanical pressure into an electrical signal by exploiting the piezoresistive effect. This phenomenon occurs in certain materials, particularly semiconductors like silicon, where their electrical resistivity changes when subjected to mechanical stress or strain. The principle relies on the deformation of the material under pressure, altering its internal crystal structure and thus its resistance.

These sensors are widely used in various applications due to their high sensitivity, compact size, and reliability. Common materials include doped silicon, which exhibits significant piezoresistive effects when strained. The sensor typically consists of a diaphragm—a thin, flexible membrane—that deforms under applied pressure, causing strain in embedded or surface-mounted resistive elements. The change in resistance is then measured and correlated to the applied pressure.

Resistivity-based pressure sensors are favored in industries such as automotive, aerospace, and medical devices. In automotive applications, they are used in tire pressure monitoring systems (TPMS) to ensure optimal tire inflation for safety and fuel efficiency. In aerospace, they help monitor cabin pressure and engine performance. Medical devices, such as blood pressure monitors, also rely on these sensors for accurate and real-time measurements.

Compared to other pressure sensing technologies, such as capacitive or piezoelectric sensors, resistivity-based sensors offer high precision and linearity. However, they may be more sensitive to temperature variations, requiring calibration or compensation mechanisms in some applications. Advances in microfabrication techniques have further improved their performance, enabling mass production of miniaturized and cost-effective sensors.