A sensor for measuring the concentration of an analyte in a medium is disclosed. In one embodiment, the sensor comprises a sensing element including a matrix material and, covalently bonded thereto, one or more monomeric indicator components each of which is capable of providing a first emitted signal...http://www.google.com.au/patents/US5498549?utm_source=gb-gplus-sharePatent US5498549 - Sensors and methods for sensing
