A new liquid-borne particle counter is described that utilizes an optimized optical set-up to determine the size distribution and concentration by two different methods and to estimate the shape-factor of the suspended particles. The aim of this optimization was to achieve the appropriate optical conditions for such type of measurement, viz determining the geometry of the illumination and detection, and calculating the testing volume and dependence of parameters of detected signal on the particle size for pulse height and pulse duration methods performed at the illumination and detection conditions. The possibility of estimating the shape-factor of micron-size particles ii discussed. The proposed measurement method was incorporated in a PC-controlled LQB-1-200-L-T liquid-borne laser particle counter developed on the basis of previous APC -03-2 and APC-03-2A air-borne particle counters and a LQB-1-200 liquid-borne particle counter.
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