A method that allows a plurality of variables to be measured with the aid of an integrated optical sensor module. Because all the components necessary for carrying out the method are integrated on the same substrate, the sensor becomes small, compact, stable, malfunction-free and economical. The sensor...http://www.google.de/patents/US5442169?utm_source=gb-gplus-sharePatent US5442169 - Method and apparatus for determining a measuring variable by means of an integrated optical sensor module
