DIODE-LASER BASED PHOTO-ACOUSTIC SPECTROSCOPY IN ATMOSPHERIC NO­2 DETECTION

- Mitrayana; T. Pierera; B.W.M. Moeskops; S. Persijn; H. Naus; F.J.M. Harren; M.A.J. Wasono; - Muslim; W. Rochmah

DIODE-LASER BASED PHOTO-ACOUSTIC SPECTROSCOPY IN ATMOSPHERIC NO2 DETECTION

- Mitrayana^(1*), T. Pierera⁽²⁾, B.W.M. Moeskops⁽³⁾, S. Persijn⁽⁴⁾, H. Naus⁽⁵⁾, F.J.M. Harren⁽⁶⁾, M.A.J. Wasono⁽⁷⁾, - Muslim⁽⁸⁾, W. Rochmah⁽⁹⁾

(1) Atomic and Nuclear Physics Lab. Physics Dept. Gadjah Mada University
(2) Molecular and Laser Physics Dept. Radboud University of Nijmegen
(3) Molecular and Laser Physics Dept. Radboud University of Nijmegen
(4) Molecular and Laser Physics Dept. Radboud University of Nijmegen
(5) Molecular and Laser Physics Dept. Radboud University of Nijmegen
(6) Molecular and Laser Physics Dept. Radboud University of Nijmegen
(7) Atomic and Nuclear Physics Lab. Physics Dept. Gadjah Mada University
(8) Atomic and Nuclear Physics Lab. Physics Dept. Gadjah Mada University
(9) Medical Faculty of Gadjah Mada University
(*) Corresponding Author

Abstract

We have developed a simple, low cost, and compact NO2 detection system. It’s based on photoacoustic spectroscopy (PAS) method uses a diode laser as a source of radiation. The PAS system has a detection limit of 10 ppbv for NO2. With this set-up we were able to detect the NO2 concentration from urban air near our campus. We have also investigated the NO2 dissociation effect on the PAS system via NO measurements using a direct absorption spectroscopy method on quantum cascade laser (QCL) system.

Keywords: photoacoustic spectroscopy