The sperm count of a specimen of sperm is measured by exciting the specimen with a beam of substantially monochromatic light, then measuring the intensity of the intrinsic native fluorescence emitted or the scattered light from the specimen, and then determining the sperm count using the intensity measurements....http://www.google.de/patents/US5061075?utm_source=gb-gplus-sharePatent US5061075 - Optical method and apparatus for diagnosing human spermatozoa
