We report a long-range near-IR methane sensor for inspection of natural gas collection, storage sites and pipeline
networks. The principle is that a laser carrier beam is directed at the target surface across a test path and the backscatter
from the surface is collected via a large Fresnel lens onto the photoreceiver. A Raman amplifier has been designed to
amplify the TDLS optical signal generated by a 1650.95nm DFB laser diode to over 1W CW. Combining the high
power output of the Raman amplifier and the highly sensitive TDLS technique, we may report 100ppm.m sensitivity at
more than 100m by extrapolation.
We report a long-range near-IR methane sensor for inspection of natural gas collection, storage sites and pipeline
networks. The principle is that a laser carrier beam is directed at the target surface across a test path and the backscatter
from the surface is detected in a large Fresnel lens on the sensor. A Raman amplifier has been designed to amplify the
TDLS optical signal generated by a 1650.95nm DFB laser diode to over 1W CW. Combining the high power output of
the Raman amplifier and the highly sensitive TDLS technique, we may report 100ppm.m sensitivity at more than 100m.
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