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We will report on recent advances of the quartz-enhanced photoacoustic (QEPAS) technique based on quantum cascade lasers (QCLs) in order to realize QEPAS sensors with improved sensitivity and selectivity. The QEPAS technique is based on the photoacoustic effect and exploits the enhancement of acoustic energy density provided by a quartz tuning fork (QTF), which acts as a high quality factor piezoelectric acoustic transducer [1]. An important advantage of the QEPAS technique is that no optical detection is required.
© 2015 IEEE
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