39 citations
6 papers
Sensitive multi-species photoacoustic gas detection based on mid-infrared supercontinuum source and miniature multipass cell
Tommi Mikkonen, Tuomas Hieta, Goëry Genty +1
We report multipass broadband photoacoustic spectroscopy of trace gases in the mid-infrared. The measurement principle of the sensor relies on supercontinuum-based Fourier transfor…
Enhancement of photoacoustic spectroscopy with sorption enrichment for ppt-level benzene detection
Juho Karhu, Tuomas Hieta
A real time trace gas detector for benzene is demonstrated. The measurement system takes an advantage of modest enrichment through short adsorption periods to reach a ppt-level det…
LED based photoacoustic NO sensor with sub-ppb detection limit
Juho Karhu, Tuomas Hieta, Farshid Manoocheri +2
A high-sensitivity LED based photoacoustic NO sensor is demonstrated. Sensitive photoacoustic gas sensors based on incoherent light sources are typically limited by background…
Optical power detector with broad spectral coverage, high detectivity and large dynamic range
Jussi Rossi, Juho Uotila, Sucheta Sharma +6
Optical power measurements are needed in practically all technologies based on light. Here we report a general-purpose optical power detector based on the photoacoustic effect. Opt…
High-resolution analysis of the band of radiocarbon methane
Santeri Larnimaa, Lauri Halonen, Juho Karhu +6
We present the first high-resolution measurements and rotational analysis of the fundamental asymmetric stretching vibrational band of radiocarbon methane. A spectrome…
Broadband photoacoustic spectroscopy of with a high-power mid-infrared optical frequency comb
Juho Karhu, Teemu Tomberg, Francisco Senna Vieira +7
We report a photoacoustic spectroscopy setup with a high-power mid-infrared frequency comb as the light source. The setup is used in broadband spectroscopy of radiocarbon methane.…