A spectrum analyzing system measures or analyzes the colorimetric properties of a test sample at a preselected wavelength or range of wavelengths within the ultraviolet, visible, and near infrared regions. The system includes a spectrophotometer provided with a wideband light source, optical devices...http://www.google.com.au/patents/US4158505?utm_source=gb-gplus-sharePatent US4158505 - Spectrum analyzing system with photodiode array
