Abstract
Two kind of frequency modulator to produce multi-frequency light impulse array and a kind of measurement system for light addressable potentiometric sensor (LAPS) array are introduced based on micro-lens and frequency modulator disk. Simulation of FFT is used to analyze the available photocurrent signals of LAPS array with MATLAB. According the simulation spectrum, the corresponding photocurrent signals of light impulse with different frequencies are able to resolve. When the duty ratio is larger than or equal to 30%,the construction of the frequency modulator can be simplified, which further prove that LAPS array with multi-frequency light impulses is provided with reliable resolution .All of above provides enough theoretical foundation for preparation and signal processing of LAPS array device .
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