The PolySense team has just published a new article on Optics Express demonstrating an ultra-highly sensitive and robust CH4 sensor based on a 3.3 μm interband cascade laser and a low-noise differential photoacoustic (PAS) cell. With an integration time of 90 s, a detection limit of 0.6 ppb was achieved. No additional water or air laser cooling were required and thereby allowing the realization of a compact and robust CH4 sensor..
The following link provide access to the article.
http://polysense.poliba.it/wp-content/uploads/2020/06/120-sub-ppCh4-PAS_opex_2020.pdf
