A frequency modulator approach of light impulse array and a kind of measurement system for light addressable potentiometric sensors（LAPS） array are introduced based on micro-lens and frequency modulator disk.Simulation of fast Fourier transform（FFT） and wavelet analysis are carried out on available photocurrent signals of LAPS array using Matlab software.According to the simulation spectrum

the corresponding photocurrent signals of ligth impulse with different frequencies can be resolved

which further prove that LAPS array with multifrequency light impluse has good frequency domain resolution and the signal of each sensor of the LAPS array can be obtained.All of the above provide good theoretical foundation for fabrication and signal processing of LAPS array device.