High-Sensitivity Differential Helmholtz Photoacoustic System Combined with the Herriott Multipass Cell and Its Application in Seed Respiration
Guqing Guo,
Lin Li,
Yueting Zhou
et al.
Abstract:A highly sensitive photoacoustic
detection system using a differential
Helmholtz resonator (DHR) combined with a Herriott multipass cell
is presented, and its implementation to sub-ppm level carbon dioxide
(CO2) detection is demonstrated. Through the utilization
of erbium-doped optical fiber amplifier (EDFA), the laser power was
amplified to 150 mW. Within the multipass cell, a total of 22 reflections
occurred, contributing to an impressive 33.6 times improvement in
the system sensitivity. The normalized noise… Show more
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