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1.4 Unit Concentration（ppm.m）
“ The meaning of 100 ppm.m : to uniformly distribute 100 ppm of methane
gas on a gas mass of 1 m thickness. ”
It can be approximated that the unit concentration is the concentration after
the methane molecules on the straight line (laser detection line) between the
telemeter and the reflection target are uniformly "compressed" or "expanded"
into a region of 1 m thickness.
The instrument has a measured value of 100 ppm.m for a methane agglomer-
ate with a thickness of 5 m and a concentration of 20 ppm on the test line,
which corresponds to the air mass being "compressed" to a thickness of 1 m
and a concentration of 100 ppm.
1 m
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