A high-density multi-point LAPS set-up using a VCSEL array and FPGA control

Torsten Wagner, Carl Frederik Benedikt Werner, Ko Ichiro Miyamoto, Michael J. Schöning, Tatsuo Yoshinobu

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)


A new LAPS (light-addressable potentiometric sensor) set-up will be introduced, in which the light sources are miniaturised by the utilisation of a VCSEL (vertical-cavity surface-emitting laser) array to increase the measurement spot density. An FPGA (field-programmable gate array) is used to generate modulation signals for individual illumination of each measurement spot of the LAPS. The new set-up can operate a large number of measurement spots simultaneously by reading out the sum photocurrent and separate the signals of the individual measurement spots by an FFT analysis. The frequency, amplitude and offset of the modulation signal can be configured for each measurement spot by software. The new system can be combined with a positioning stage allowing the parallel read out of a single line of measurement spots and a scan perpendicular to that line in a similar manner, like for an optical scanner set-up. First measurements demonstrate the functionality of the new LAPS set-up as a chemical imaging system.

Original languageEnglish
Pages (from-to)124-128
Number of pages5
JournalSensors and Actuators, B: Chemical
Issue number2
Publication statusPublished - 2011 Jun 20


  • Biosensor
  • Chemical imaging
  • FPGA
  • Field effect
  • LAPS
  • Light-addressable potentiometric sensor

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Instrumentation
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry


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