LASAIR: New remote sensing instruments based on near-infrared diode lasers

Physics – Optics

Scientific paper

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Scientific paper

Three versions of a near infrared system based on commercial communication type laser diodes have been developed. They have high selectivity and good sensitivity for a number of important gases. All three systems use a common control and data logging and analysis box. The LASAIR-R is a simple, inexpensive, remote sensing instrument using a single 10 cm Cassegrain telescope to both transmit and receive the laser beam. The LASAIR-S is a system for continuous, non-extractive stack monitoring. Fiber optics are used to take the laser beam from the control box (suitably located in the plant), to the stack and to bring the return back to the box. The LASAIR-P is a point source instrument using a multipath cell inside the box to provide the sensitivity required. The ease of operation and the relatively low cost should make these systems an attractive method for measuring specific gases for industrial and regulatory markets.

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