Design of precision light intensity modulation for light-addressable potentiometric sensor

In this study, we present a novel design of precision light intensity modulation for LAPS measurement, aim to ameliorating the stability and precision of light source. A superluminescence LED (SLED) module, with a specialized designed SLED driver, is proposed as the light source. This design provides precision sine light intensity output. Furthermore, this design is immune from variation of ambient temperature. Contrast experiments were given between two conditions, with design of precision light intensity modulation and with traditional light source. From contrast experiments, it can be deduced that LAPS system with design of precision light intensity modulation has better linearity and accuracy than the latter one.