In an apparatus in which particles which may include biological cells are passed through an optical sensing zone to measure their spatial radiant energy distribution for the purpose of identifying and/or characterizing the particles or cells, a structure and method are provided for increasing the usefulness...http://www.google.com.au/patents/US4523841?utm_source=gb-gplus-sharePatent US4523841 - Radiant energy reradiating flow cell system and method
