| Along with the concept of home care becoming more popular,applications for daily biological and medical industry are attracting more and more attention and research.Miniaturizing the experimental apparatus and clinical analytical instruments is becoming an inevitable trend.A light-addressable potentiometric sensor(LAPS)system is a field-effect semiconductor-based,label-free chemical imaging sensor system.In this study,a novel portable LAPS system is developed by using a LabVIEW-FPGA board and a self-designed printed circuit board(PCB)to integrate the functions of function-generator,micromirror controller,pre-amplifier,lock-in-amplifier and DAQ card.For the input part,the system supplies the laser with stable voltage and tunable frequency.The system provide voltage signal with adjustable maximum,minimum,step and delay for the reference electrode.The system also supply voltage signals of enable,FLCK and deflection information as required to the micromirror controller.For the data processing part,this study use multistage amplifier and filter to obtain the required accuracy.And then with the plotting function and the built-in Matlab function in LabVIEW,the photocurrent-bias voltage curves and the 2D chemical image can be generated successfully.I also realized the storage function in this system for further analyzation.This study realized the synchronization of LAPS system,which is definitely a breakthrough in this field.With synchronization,all the parameters can be controlled by only one programming interface,which simplified the operation efficiently.The system can generate the 2D chemical image in real time for the synchronization of the measured photocurrent and its current coordinates. |
PDF Full Text Request