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Thermal and Wavelength Filters

Field instruments like the AP2C incorporate both sulfur and phosphorus filters within the same detector. The user switches back and forth between the two types of filters to permit measuring characteristic light emissions from both elements. [Pg.142]

After the photons emitted by sulfur or phosphorus pass through the wavelength filter, they are received by the PMT. The PMT is a vacuum tube that consists of a photocathode, several dynodes, and an anode to convert the incoming fight into an [Pg.142]


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Thermal wavelength

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