This article describes the principles of operation of a novel approach to liquid nephelometry. The use of a modulated laser diode light source in combination with the liquid cell design allows measurements with a sensitivity of 0.00001 NTU, one to two orders of magnitude more sensitive than previous designs.

Data presented indicate the instrument response to sub 0.1 micron PSL spheres as well as sensitivity to colloidal silica to 6.3 parts per billion (ppb).

Illustrative examples will be given for the application of two simultaneous liquid nephelometers for filter collection efficiency testing as a function of challenge particle size, filter loading, and flow rate.

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