Abstract
Most trace gas detection methods developed so far largely rely on active sampling procedures, which are known to introduce different kinds of artifacts. Here, we demonstrate sampling-free in situ trace gas detection in millimeter scale volumes with fiber coupled cantilever enhanced photoacoustic spectroscopy. Our 2.4 mm diameter fiber-tip sensor is free from the wavelength modulation induced background signal (a phenomenon that is often overlooked in photoacoustic spectroscopy) and reaches a normalized noise equivalent absorption coefficient of 1.3 × 10 -9 W cm -1 Hz -1/2 for acetylene detection. To validate its in situ gas detection capability, we inserted the sensor into a mini fermenter for headspace monitoring of CO 2 production during yeast fermentation. Our results show that the sensor can easily follow the different stages of the CO 2 production of the fermentation process in great detail.
| Original language | English |
|---|---|
| Article number | 023102 |
| Pages (from-to) | 1-8 |
| Number of pages | 8 |
| Journal | Review of Scientific Instruments |
| Volume | 90 |
| Issue number | 2 |
| Early online date | 6 Feb 2019 |
| DOIs | |
| Publication status | Published - Feb 2019 |
Funding
This research was funded by European Research Council (ERC) (615170) and LASERLAB-EUROPE (654148). The authors thank M. Slaman and E. Paardekam for technical support. S. Zhou thanks F. Ariese for pointing out the DC offset of the noise signal for the old sensor. Davide Iannuzzi is a shareholder of Optics11.
| Funders | Funder number |
|---|---|
| Horizon 2020 Framework Programme | 654148 |
| European Research Council | 615170 |
