SCATTERING CENTRE DETECTOR ASSEMBLY AND METHOD

An assembly which comprises (a) a duct (22) for transmission of fluids, said duct having longitudinal axis, (b) at least one emitter (301) capable of exciting a beam of radiation (21) in the form of a cone having root angles betaex and betaey, which may be the same or different, into a cross section area of a duct to be analysed in a direction downstream of fluid flow in the duct at an angle lambdae from the plane perpendicular to the longitudinal axis of the duct, the angle lambdae being between 5° to 45°, (c) a detector (23, 304) sensitive to radiation radiated by scattering centres in the fluid over at least 1% of the cross sectional area of the duct, the direction of the central axis of the emitter cone being at an angle alpha to the direction of the central axis of the detector cone, the detector cone having root angles betadx and betady, which may be the same or different and the detector cone having angle lambdad perpendicular to the longitudinal axis of the duct, the direction of the detector being downstream of fluid flow in the duct, the angle alpha being in the range 0° to 180° and angle lambdad being between 5° to 45°, the detector collecting scattered radiation and the detector being coupled to (d) a collator (310) for collecting data from the detector.