Intensity modulated photothermal measurements of NO2 with a compact fiber-coupled fabry–pérot interferometer

Philipp Breitegger*, Benjamin Lang, Alexander Bergmann

*Corresponding author for this work

    Research output: Contribution to journalArticle

    Abstract

    Sensors for the reliable measurement of nitrogen dioxide concentrations are of high interest due the adverse health effects of this pollutant. This work employs photothermal spectroscopy to measure nitrogen dioxide concentrations at the parts per billion level. Absorption induced temperature changes are detected by means of a fiber-coupled Fabry–Pérot interferometer. The small size of the interferometer enables small detection volumes, paving the way for miniaturized sensing concepts as well as fast response times, demonstrated down to 3 s. A normalized noise equivalent absorption of 7.5 × 10−8 cm−1W/ Hz is achieved. Additionally, due to the rigid structure of the interferometer, the sensitivity to mechanical vibrations is shown to be minor.

    Original languageEnglish
    Article number3341
    JournalSensors
    Volume19
    Issue number15
    DOIs
    Publication statusPublished - 1 Aug 2019

    Keywords

    • Gas sensor
    • Nitrogen dioxide
    • Optical microphone
    • Photothermal interferometry

    ASJC Scopus subject areas

    • Analytical Chemistry
    • Biochemistry
    • Atomic and Molecular Physics, and Optics
    • Instrumentation
    • Electrical and Electronic Engineering

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