CERTIFICATION OF A LASER AEROSOL SPECTROMETER

A method is proposed for the metrological certification of an instrume nt (and the test stand as a whole) that measures the dust content of g ases during testing and monitoring of the efficiency of dust-catching equipment. Results are presented from the calibration of laser aerosol spectrometer LAS-007, which was designed and built at the L. Ya. Karp ov Scientific Research Institute of Physical Chemistry. The spectromet er is used to measure the quantity and fractional composition of parti cles in air samples during tests of highly efficient cermet filters de signed for the ultrapurification of gases. The filters were made by th e Ural Electrochemical Combine for applications in microelectronics, m icrobiology, and other fields. It is shown that in measurements of the natural dust content of atmospheric air, the LAS-007 underestimates t he number of small (d = 0.15-0.20 mu m) particles by an order of magni tude and overestimates the number of coarse (d greater than or equal t o 0.9 mu m) particles by roughly a factor of six.