NUMERICAL MODELING OF UV INTENSITY - APPLICATION TO COLLIMATED-BEAM REACTORS AND CONTINUOUS-FLOW SYSTEMS

When properly designed, collimators can be used to develop a source of electromagnetic radiation which is uniform and easily quantified. A c ollimator design is presented which minimizes reflection and promotes the development of a well-behaved, quantifiable radiation source. The design of the collimator is optimized by use of a numerical model, lin e source integration (LSI), a continuous version of the widely used po int-source summation technique. The LSI model is used to quantify the radiation intensity field from a collimator which incorporated a stand ard low-pressure mercury are lamp as its source of radiation. A method of measuring lamp output power is also demonstrated which employs exp erimental measurements of intensity through a collimator and the LSI m odel. The physical meaning of this measurement, its limitations and po tential applications are discussed. (C) 1997 Elsevier Science Ltd.