Calibration of the laser induced pressure pulse method when using a semiconducting electrode as the laser target

Space charge distributions can directly be qualitatively estimated from a laser induced pressure pulse (LIPP) signal. To obtain precise quantitative space charge density, calibration of the LIPP method is necessary which requires an ideal measured signal. However, when a carbon loaded polymer electrode is used as the laser target, a long signal tail can be found. The cause of the signal tail is analyzed in this study and two methods are proposed to correct the experimental signals. According to the calibration procedure introduced, space charge density is obtained respectively by using the two correction methods. Finally, the calculated results are compared and the validity of the calibration and correction methods is confirmed. The correction and calibration procedures proposed can be extended to piezoelectric induced pressure pulse and pulsed electroacoustic methods.