Abstract:
A method of determining the mean size of given solid particles in a fluid comprises passing two x-ray beams of different energies into the fluid. The energies of the two X-ray beams being such that the resulting intensity of fluorescent radiations emitted from the particles due to one beam is substantially independent of the mean size of the particles while the intensity of fluorescent radiations emitted from the particles due to the other beam is substantially dependent upon the mean size of the particles. A comparison of the intensities of these two types of emitted fluorescent radiations gives an indication of the mean particle size.
Abstract:
The invention concerns the analysis of moving fluids which may be slurries or the like. According to the invention the fluid to be analysed flows under pressure through an orifice at such a rate that it forms a clearly defined jet. Thus non-contact means such as an X-ray device can be used to analyse the fluid without the need of a window between the analysis means and the fluid. Means are provided both for determining the flow rate of the fluid in the jet and its dimensions so that the non-contact analysis means can be protected from damage should the flow rate or the dimensions of the jet vary beyond predetermined limits.