method for calibrating a device for measuring the concentration of bp. the quantity of gas particles in a gas flow

摘要

Apparatus for measuring particle content of a flowing gas comprises a source emitting a beam of radiation of a frequency absorbed by the gas and a detector aligned therewith and means for adjusting the path length of the beam in the gas. Measurements are taken before and after the adjustment to calculate the content. Standardisation of apparatus involving measurements at frequencies absorbed and non- absorbed by the gas and adjustment of the path length is described. IMAGE