Dual-wavelength measurement system for absorbance chemical sensing

D. Izquierdo, M. Puyol, I. Salinas, R. Alonso, J. Alonso, C. Domínguez, I. Garcés

Research output: Contribution to journalArticleResearchpeer-review

5 Citations (Scopus)


A novel compact dual-wavelength measurement system for absorbance chemical sensing incorporating digital lock-in amplifiers is reported. Its main innovation is the introduction of a reference wavelength to correct the possible non-specific optical changes of the system. The performance of the instrumentation has been tested on a laboratory setup and with integrated optical absorbance sensors. © 2007 IOP Publishing Ltd.
Original languageEnglish
Pages (from-to)3443-3450
JournalMeasurement Science and Technology
Issue number11
Publication statusPublished - 1 Nov 2007


  • Absorbance measurement
  • Digital signal processor
  • DSP
  • Dual-wavelength measurement
  • Lock-in amplification


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