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In the telemetry test, after the emitted beam passes through the leaked me-
thane air mass, it must be reflected by the reflecting surface, and then passed
through the air mass and returned to the detector, so that the instrument can
complete the measurement and output the unit concentration value.
Because the leaked methane air mass drifts with the wind, it is constantly
changing and unevenly distributed in space and time; the distance from the
instrument to the reflector is uncertain, and the thickness of the methane gas
mass is also uncertain. In order to be able to express the concentration values
in this case, the concept of unit concentration (ppm.m) is commonly used in
the industry to mean: methane concentration (ppm) x standard thickness (1
m).
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