A phase fluorometer employs a baseband frequency generator to generate a sample baseband signal at a first frequency f.sub.o and a reference signal correlated to the sample baseband signal. A second signal generator generates a carrier signal having a second frequency f. The sample baseband...http://www.google.de/patents/US5818582?utm_source=gb-gplus-sharePatent US5818582 - Apparatus and method for phase fluorometry
