Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 187, Issue -, Pages 574-577Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2013.04.084
Keywords
Diode laser; MIR; Room temperature; Methane; Hydrocarbon; Sensor
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To the best of our knowledge, we present for the first time spectroscopic methane measurements using a laser diode at 3.3 mu m operated in continuous mode at room temperature. The DFB-type laser emits a maximum optical output power of 1.5 mW with a spectral linewidth below 10 MHz. This novel kind of semiconductor laser allows precise photoacoustic measurements of characteristic methane absorption structures in the v3 band. In addition, the setup enables a detection limit below 1 ppm. (C) 2013 Elsevier B.V. All rights reserved.
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