naa a22 4500 510767702 CHVBK 20180411083202.0 cr unu---uuuuu 180411e20130901xx s 000 0 eng 10.1007/s12043-013-0581-9 doi (NATIONALLICENCE)springer-10.1007/s12043-013-0581-9 Low-limit detection of NO2 by longitudinal mode selection in a photoacoustic resonant system [Elektronische Daten] [F YEHYA, A CHAUDHARY] The paper reports the pulsed laser-based photoacoustic (PA) spectroscopy of NO2 in a resonant PA cavity with special filters made of stainless steel. The PA cell along with special types of sound filters are designed and fabricated to excite only the second-order longitudinal mode inside the cavity. The second harmonic, i.e. λ = 532nm pulse width, of 7ns obtained from Q-switched Nd:YAG laser at 10Hz repetition rate has been used to study the saturation behaviour of the PA signal and absorption coefficient with respect to the input laser energy. Generally, the Q-factor of longitudinal modes in the acoustic cavities is quite low. However, by modifying the design of the cell and the filter, we can achieve high value of Q = 30. The combination of special filter along with the experimental data acquisition technique helped us to achieve the minimum detection concentration of NO2 of the order of 9ppbV which is much better than the previous value of the same PA cell without filter [Yehya and Chaudhary, Appl. Phys. B 106, 953 (2012)]. Indian Academy of Sciences, 2013 Photoacoustic nationallicence pulsed laser nationallicence second longitudinal mode nationallicence filters nationallicence NO2 nationallicence YEHYA F. Advanced Centre of Research in High Energy Materials, University of Hyderabad, 500 046, Hyderabad, India aut CHAUDHARY A. Advanced Centre of Research in High Energy Materials, University of Hyderabad, 500 046, Hyderabad, India aut Pramana Springer India 81/3(2013-09-01), 535-545 0304-4289 81:3<535 2013 81 12043 https://doi.org/10.1007/s12043-013-0581-9 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s12043-013-0581-9 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- YEHYA F. Advanced Centre of Research in High Energy Materials, University of Hyderabad, 500 046, Hyderabad, India aut NATIONALLICENCE 700 1- CHAUDHARY A. Advanced Centre of Research in High Energy Materials, University of Hyderabad, 500 046, Hyderabad, India aut NATIONALLICENCE 773 0- Pramana Springer India 81/3(2013-09-01), 535-545 0304-4289 81:3<535 2013 81 12043 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer