JAJU878 November 2022 ADS117L11 , ADS127L11
The integrated electronic piezoelectric (IEPE) sensor is a piezoelectric vibration transducer with integrated charge amplifier and impedance converter (see Figure 3-1). Integrating the amplifier close to the sensor greatly reduces the sensor noise. One major advantage of the IEPE sensor is that the sensor is interchangeable.
The IEPE sensor is also commercially known as an Integrated Circuit Piezoelectric ( ICP®), Constant Current Line Drive (CCLD), Isotron®, DeltaTron®, and Piezotron®.
Uniaxial, biaxial, and triaxial IEPE accelerometers are available in the market typically with a two-wire connector per axis. Sensors with an output proportional to acceleration is more common (accelerometer), although a velocity-proportional output is also available.
Constant current is applied to the two-wire connection from which the IEPE sensor is drawing power and establishing a constant DC offset around 10 V. A vibration-sensing value is superimposed of this DC signal at the output of the sensor, which is typically AC-coupled to the sensor interface circuit.