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Title: Moisture Measurement Using Laser Spectroscopy
Author: Ken Soleyn
Source: 2011 International School of Hydrocarbon Measurement
Year Published: 2011
Abstract: Tunable Laser Diode Spectroscopy (TDLAS) is rapidly becoming the measurement technology of choice for continuous online moisture measurement in natural gas. Natural gas is dehydrated and treated prior to transportation and use. The removal of water from natural gas is of considerable costs to the supplier and consumer. Reducing dehydration costs is a tradeoff between profits and the reduction of gas quality. Water increases maintenance cost within the gas pipeline infrastructure. Water vapor present in excess amounts in natural gas results in pipeline and component corrosion, can cause ice buildup, methane hydrate formation, lowers the calorific value and increases the energy consumption for compression and transportation. No technology is without limitations however TDLAS technology offers several advantages over the other types of sensor-based system including fast response and long-term stability. This technology does not rely on a wetted moisture sensing surface. Light energy transmitted through an inert sample cell is the basis of the measurement. The fundamental principle of measurement is based on the Beer-Lambert law which relates the concentration (mole fraction) of a specific gas in gas media to the absorption of light at a specific frequency

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