A wavelength correction apparatus automatically corrects a deviation of a testing wavelength from a reference spectrum analyzer installed on-site. The apparatus is constructed of a reference light source 62 for outputting a reference light of a specific wavelength; a light input terminal 50 for inputting...http://www.google.de/patents/US6452674?utm_source=gb-gplus-sharePatent US6452674 - In-situ wave correction apparatus
