Measurement of solid particle concentration in a fluid stream

G - Physics – 01 – N

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G01N 15/06 (2006.01) G01N 27/60 (2006.01) G01N 1/22 (2006.01)

Patent

CA 2177504

Apparatus for measuring concentration of solid particles in a fluid stream that includes a probe for disposition in the fluid stream to provide an electrical probe signal as a triboelectric function of concentration of solid particles in the fluid stream. A first circuit is coupled to the probe for providing a first electrical signal as a proportional function of the probe signal. A second circuit is coupled to the probe for providing a second electrical signal as a function of rate of change of the probe signal. Differential amplifiers received the first and second signals, and provide a third signal as a function of a difference therebetween. An apparatus output signal is provided when such difference exceeds a preselected threshold.

Dispositif pour mesurer la concentration de particules solides dans un écoulement fluide, le dispositif en question comportant une sonde destinée à être disposée à l'intérieur du fluide en écoulement afin de produire un signal électrique comme fonction triboélectrique de la concentration de particules solides dans l'écoulement fluide. Un premier circuit est raccordé à la sonde pour la production d'un premier signal électrique proportionnel au signal de la sonde. Un deuxième circuit est raccordé à la sonde pour la production d'un deuxième signal électrique fonction de la vitesse de variation du signal de la sonde. Les premier et deuxième signaux sont transmis à des amplificateurs différentiels qui produisent un troisième signal qui est fonction de la différence entre les deux signaux d'entrée. Le dispositif produit un signal de sortie lorsque cette différence dépasse un seuil prédéterminé.

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