Abstract
In this paper, a highly sensitive methane (CH4) sensor based on tunable diode laser absorption spectroscopy (TDLAS) with 3D-printed multi-pass cell (MPC) is reported. A MPC design model based on ray tracing mathematical method with the law of reflection in vector form was established. The designed MPC has an optical path length (OPL) of 37.8 m and a ratio of optical path length to volume (RLV) of 13.9 cm−2 to enhance the optical absorption. The 3D-printed gas chamber equipped with the MPC and fiber-coupled input greatly simplifies optical alignment. A minimum detection limit (MDL) of the constructed CH4-TDLAS sensor based on fiber-coupled 3D-printed MPC with dense spot pattern was determined to be 30.93 ppb. It can be further improved to 11.79 ppb when the averaging time of the system was 300 s according to the Allan deviation analysis.
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