Abstract:

The laser induced breakdown spectroscopy (LIBS) has been used to detected the concentration of ash in coal. Applied the partial least squares (PLS) method on 10 selected samples which are known as the calibration samples to establish quantitative analysis regression on models of the whole ash content. Then, use 3 untested samples to test the result of quantitative analysis regression models. The result shows that the laser induced breakdown spectroscopy combined with partial least squares method can detect the concentration of ash content in coal. The average relative errors (REP) are less than 8% mass fraction. The experiment verifies the applicability of the laser induced breakdown spectroscopy in synchronization measurement of ash content in coal.

Key words: laser induced breakdown spectroscopy, ash content, partial least squares