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Updated: Jan 28, 2026

Enhancement Method of Surface Acoustic Wave-Atomizer Efficiency for Olfactory Display
Published on: November 14, 2018
Cavity-enhanced cantilever-enhanced photo-acoustic spectroscopy
Teemu Tomberg1, Tuomas Hieta, Markku Vainio
1Department of Chemistry, University of Helsinki, P.O. Box 55, FI-00014, Helsinki, Finland. lauri.halonen@helsinki.fi.
Abstract:
We have improved the sensitivity of a state-of-the-art cantilever-enhanced photo-acoustic trace gas sensor by combining it with an optical power build-up cavity. The build-up cavity enhances the photo-acoustic signal by a factor of ∼100, resulting in an exceptionally good normalised noise equivalent absorption (NNEA) value of 1.75 × 10-12 W cm-1 Hz-1/2. We demonstrate the sensor platform in the 1530 nm wavelength range with a simple distributed feedback diode laser, achieving 75 ppt sensitivity for C2H2 with a 10 s integration time.
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