New solid-state fluorescence sensor used to monitor photosynthetic parameters and algal biomass

An in situ variable fluorescence system has been developed that will allow real-time measurement of the primary variable fluorescence variables; Fv, Fo and Fm. Advances in solid-state light detectors and the development of advanced signal processing circuitry have led to the development of a new generation of fluorescence instrumentation that can be used to measure photosynthetic parameters in a wider range of platforms and locations. Market pressures for smaller and more energy efficient sensors has been the primary motivation in the development of in situ variable fluorescence sensor and a line of small, filter fluorometers for algal and cyanobacterial biomass measurements. The variable fluorescence system is described and performance data presented. Variable fluorescence data is emerging as an important biological indicator and is being used for indicators of nutrient state, productivity, and algal bloom formation.