Pressure Sensor Working Principles
Pressure Sensor Memorizes Working Principles
Pressure sensors are devices used to measure the pressure applied to a system. The operating principles differ depending on the technology used and the type of sensor.
Generally, a pressure sensor uses an element that is sensitive to pressure change. This element is usually deformable, such as a diaphragm or bourdon tube. When the pressure changes, the shape of this element changes and this change is converted into a measurable signal.
Capacitive pressure sensors are based on the principle that capacitance is sensitive to pressure changes. Two electrodes inside the sensor form a capacitor, and the distance between the capacitor changes depending on pressure changes. This change causes the capacitance to change and a measurable signal is produced.
Piezoelectric pressure sensors are based on the piezoelectric effect. This effect is the separation of electrical charges as a result of the deformation of a crystal. Pressure changes change the shape of the crystal, causing the electrical charges to separate. These loads can be used as a measurable signal.
Resistive pressure sensors are based on the principle that the resistor is sensitive to pressure changes. In these sensors, a pressure sensitive resistor element is used and resistance changes are converted into a measurable signal.
Magnetic pressure sensors are based on the principle that the magnetic field is sensitive to pressure changes. A magnetic element inside the sensor moves due to pressure changes, and this movement causes the magnetic field to change. This change can be used as a measurable signal.