Sub-part-per-trillion level detection of hydrogen fluoride by cantilever-enhanced photo-acoustic spectroscopy
Abstract
We present a highly sensitive hydrogen fluoride detector based on simple cantilever-enhanced photo-acoustic spectroscopy. A noise equivalent concentration of 5 parts-per-trillion was achieved in 1 s and 650 parts-per-quadrillion in 32 min. The limits were reached with an average optical power of 950 mW using a new continuous-wave optical parametric oscillator at 2.476 μ m. The achieved normalized noise equivalent absorption coefficient was 2.7×10-10 Wcm-1 Hz-1/2.
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