Field-programmable gate array based controller for multi spot light-addressable potentiometric sensors with integrated signal correction mode

Carl Frederik Werner, Sebastian Schusser, Heiko Spelthahn, Torsten Wagner, Tatsuo Yoshinobu, Michael J. Schöning

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)

Abstract

A light-addressable potentiometric sensor (LAPS) can measure the concentration of one or several analytes at the sensor surface simultaneously in a spatially resolved manner. A modulated light pointer stimulates the semiconductor structure at the area of interest and a responding photocurrent can be read out. By simultaneous stimulation of several areas with light pointers of different modulation frequencies, the read out can be performed at the same time. With the new proposed controller electronic based on a field-programmable gate array (FPGA), it is possible to control the modulation frequencies, phase shifts, and light brightness of multiple light pointers independently and simultaneously. Thus, it is possible to investigate the frequency response of the sensor, and to examine the analyte concentration by the determination of the surface potential with the help of current/voltage curves and phase/voltage curves. Additionally, the ability to individually change the light intensities of each light pointer is used to perform signal correction.

Original languageEnglish
Pages (from-to)9656-9660
Number of pages5
JournalElectrochimica Acta
Volume56
Issue number26
DOIs
Publication statusPublished - 2011 Nov 1

Keywords

  • FPGA
  • LAPS
  • Light-addressable potentiometric sensor
  • Phase mode

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Electrochemistry

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