Hamamatsu News 3 / 2019

11 News 2019 Vol. 3 Excellent luminous efficiency and instantaneously high optical output support measurements of even low pollutant concentrations in exhaust gas and wastewater Currently, one technique called the “fluorometer method” for monitoring residual SO x discharged from scrubbers is becoming the mainstream that determines the concentration of pollutants called PAHs (polycyclic aromatic hydrocarbons) by measuring their fluorescence. In this method, PAHs in exhaust gas and wastewater constantly discharged from a scrubber are excited by light to generate fluorescence. Xenon flash lamps were selected as a light source ideal for efficiently exciting PAHs. Our xenon flash lamps are designed to instantaneously emit highly intense light over a broad wavelength range from 160 nm to 7,500 nm. This allows measuring even low-concentration PAHs in exhaust gas and wastewater. We also provide compact lamp modules integrated with a power supply and trigger socket that easily install into equipment. Bringing together our know-how from manufacturing electron tubes and discharge control technology to deliver the high stability and long service life needed to withstand long ocean cruises There are even more reasons why our xenon flash lamps are selected for SO x scrubber monitors used on ships. In modern maritime transport, containers are transshipped from one port to another to streamline transportation so it often takes more than a whole year for a ship to return to its home port. This makes it essential that the SO x scrubber work both correctly and non-stop while the ship is at sea. These con­ ditions mean that the SO x scrubber and peripheral devices must have high stability and long service life and also be maintenance-free. Our xenon flash lamps are highly rated for their high stability and long service life achieved by electron tube manufacturing knowledge and discharge control technology we have accumulated since our company was first founded. We will further extend these characteristics and continue to develop even more compact and cost-saving products. Responding to diverse analysis needs with our wide variety of light emitting and sensing technologies Besides SO x emission reduction described above, the maritime shipping industry is engaged in various environmental protection activities such as reducing NOx emissions and deterring environmen­ tal pollution caused by ballast water. A wide variety of optical sensing technologies are applied to support those technologies. At Hamamatsu Photonics we have a wide ranging product lineup including light detectors such as photomultiplier tubes and InAsSb (indium arsenide antimonide) photovoltaic detectors and light sources such as xenon flash lamps and quantum cascade lasers (QCLs). 200 300 400 500 600 700 800 900 1000 1100 0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.5 Wavelength (nm) Irradiance (µW·cm -2 ·mm -1 ) Operating conditions Main discharge voltage: 600 V Main discharge capacitance: 0.22 μF Flash frequency: 126 Hz Measurement distance: 50 cm UV glass Borosilicate glass Spectral distribution (5 W xenon flash lamp module L9455 series) Photomultiplier tubes InAsSb photovoltaic detectors Quantum cascade lasers

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