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null process

Commonly performed in spectroscopy, the optical null process is a method for radiation detection whereby physical detectors are used to rapidly interchange the intensity between a reference beam and an unknown beam. This variation between the reference and unknown beam is repeated until the difference between the two alternating responses is decreased to zero. At the zero (or null) point, it is known that the energy transmission of the reference beam has matched that of the unknown beam that has been previously passed through a sample that is being analyzed. 

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