What is a piezorezistive sensor?
Piezoresistive sensor is a device that uses changes in the resistance of certain semiconductor materials when subjected to a mechanical voltage to make an electronic effect. This piezoresist phenomenon is based on these materials tend to undergo changes in their latent resistance characteristics when bent by exposure to pressure or stress. This causes a corresponding change in any electric current passing through the device that is reflected in the measurement or deduction. The semiconductor materials commonly used in piezorezistical devices are generally the same basic metal and silicone families used in most electronic components. These components are available with a wide range of sensitivity characteristics to meet the requirements of various industries. This change in the materials of resistance characterusly changes its specific resistance value. This results in a rise or drop in any current passing through the device that is then used tothe designation or measurement of the voltage. The piezoresistist effect is used to create a number of semiconductor devices sensitive to deflection used to record and measure the force of stress, such as acceleration and pressure.
This type of sensor is usually designed from semiconductor substrates such as Germanium, polycrystalline silicone, amorphous silicone and silicone with one crystal. The typical sensor consists of a pressure semiconductor membrane with several N+ and P+ contacts. The electrical current passes at a speed depending on its resistance. This current transmission and the resulting reading vary according to the resistance changes in the folder when the membrane is exposed to pressure. These Range sensors in the complexity of simple piezorestors with limited range and temperature stability to highly stable and accurate piezophers.
Piezoresistist sensor is used in a wide range of applications involving mechanical measurementso tension. The automotive industry employs them as vacuum and pressure sensors or to indicate oil and gas levels. They are also used in medical areas in facilities such as blood pressure measurement equipment. Deep meters used by deep marine divers also use the technology of the piezoresist sensor to produce accurate in -depth values. These devices are also used in altitude and barometric tools for aircraft.
Pressure sensors of this type are also often used in electronic measuring devices that use circuits and components such as Wheatstone and Bipolar Transistors. Accelerometers used to measure positional orientation, acceleration and vibration forces also use the technology of the piezorestist sensor to create their reading. This technology has also found a way to the home environment with many dishwashers, vacuum cleaners and washing machine manufacturers who use them in their products.