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

T. Wagner, C. F. Werner, K. Miyamoto, M. J. Schöning, T. Yoshinobu

Research output: Contribution to journalConference articlepeer-review

6 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 an 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 FFT analysis. The frequency, amplitude and offset of the modulation signal can be configured for each measurement spot programmatically.

Original languageEnglish
Pages (from-to)1483-1486
Number of pages4
JournalProcedia Chemistry
Issue number1
Publication statusPublished - 2009 Sept
EventEurosensors 23rd Conference - Lausanne, Switzerland
Duration: 2009 Sept 62009 Sept 9


  • biosensors
  • field-effect
  • FPGA
  • LAPS
  • semiconductor


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