Fluorescence is the emission of light by a substance that has absorbed light or other electromagnetic radiation. It is a form of luminescence. In most cases, emitted light has a longer wavelength, and therefore lower energy, than the absorbed radiation. However, when the absorbed electromagnetic radiation is intense, it is possible for one electron to absorb two photons; this two-photon absorption can lead to emission of radiation having a shorter wavelength than the absorbed radiation. The emitted radiation may also be of the same wavelength as the absorbed radiation, termed "resonance fluorescence".
The most striking examples of fluorescence occur when the absorbed radiation is in the ultraviolet region of the spectrum, and thus invisible to the human eye, and the emitted light is in the visible region.
Fluorescence has many practical applications, including mineralogy, gemology, chemical sensors (fluorescence spectroscopy), fluorescent labelling, dyes, biological detectors, and, most commonly, fluorescent lamps.
The Water Quality Monitor (WQM) is designed to deliver core biogeochemical water quality parameters in coastal ecosystems from a single integrated package.
The Thetis Profiler is a submersible, vertically profiling platform for use in coastal marine and fresh water environments.
WET Labs' Aquatic Laser Fluorescence Analyzer (ALFA) provides spectrally and temporally resolved measurements of key bio-environmental variables in oceanic, coastal, and fresh waters.
ECO FL fluorometers measure fluorescence from chlorophyll-a, CDOM, uranine, rhodamine, and phycoyanin and phycoerythrin.
The Environmental Characterization Optics (ECO) series of sensors incorporates a common set of options with a single basic design to make them ideal for a wide variety of deployments.
The ECO Triplet custom optical instrument is now available with active anti-biofouling. It features an evolutionary design that builds off the bio-wiper and faceplate available on the current ECO line.
The puck is a miniature version of the popular Environmental Characterization Optics (ECO) series sensors built for OEM applications
A flexible platform that expands sensor capabilities of profiling floats by providing multispectral radiometry, scattering, beam attenuation, chlorophyll, and CDOM measurements to complement the temperature, salinity and oxygen measurements of the profiling float.