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Off-beam quartz-enhanced photoacoustic spectroscopy with LEDs |
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| Authors: | S Böttger M Köhring U Willer W Schade |
| Institution: | 1. Fraunhofer Heinrich Hertz Institute, Am Stollen 19B, 38640, Goslar, Germany 2. Institute for Energy Research and Physical Technology, Clausthal University of Technology, Am Stollen 19B, 38640, Goslar, Germany 3. Energy Research Centre of Niedersachsen (EFZN), Am Stollen 19A, 38640, Goslar, Germany |
| Abstract: | A photoacoustic ozone sensor based on quartz-enhanced photoacoustic spectroscopy is presented. Instead of a laser, a UV-LED at 285 nm is utilized as light source. Using an acoustical resonator in off-beam configuration, it is feasible to align the light of the LED through the resonator tube. The sensor is integrated in a miniaturized flow-through gas cell which allows fast gas exchange. The sensor performance and the influence of the speed of sound on the measurement signal are investigated. For the detection of ozone in the Hartley band, a detection limit of S = 1.27 ± 0.08 ppmv (1σ) and a noise equivalent absorption sensitivity of D = (3.02 × 10?8 ± 1 × 10?10) cm?1W(Hz)?1/2 have been achieved. |
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