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Alcohol is estimated to be the major factor of vehicle-related deaths in many counties. Setting-up random checking points with breathalyzer by police departments has several drawbacks: traffic interruption; time consuming; costly; only selected vehicles can be tested; human interaction required. In this paper, a new method based on TDLAS (Tunable Diode Laser Absorption Spectroscopy) for remote detection...
Tunable diode laser absorption spectroscopy (TDLAS) is a technique measuring the concentration of trace-gas, the gas concentration is in the sub-ppm (part-per-million) range. Experiment results show that the main part of system noise is interference fringes originating from multiple reflections between surfaces in optical components, so-called etalon effects. This work investigates the basis principle...
Tunable diode laser absorption spectroscopy (TDLAS) is a widely used technique in measuring the concentration of trace gas due to its high sensitivity, high selectivity, and fast time response. The fluctuations of temperature in the gas cell can cause the characteristics of the absorption spectra to change in the TDLAS methane sensing system. The three absorption lines in the R(3) transitions of 2v...
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