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substitution method

   Also found in: Wikipedia 0.01 sec.
substitution method [‚səb·stə′tü·shən ‚meth·əd]
(physics)
Any method of measurement, such as substitution weighing, in which a quantity is determined by substituting for it a known quantity which produces the same effect.


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The electrical substitution method is accomplished by heating the detector with an amount of electrical power that is equal to, and 180[degrees] out of phase with, the optical beam transmitted through the chopper.
Intramural comparison of NIST laser and optical fiber power ... by Hadler, Joshua / Journal of Research of the National Institute of Standards and Technology
Both laboratories employed a substitution method for their measurements.
Optical-fiber power meter comparison between NIST and PTB by Livigni, D.J. / Journal of Research of the National Institute of Standards and Technology
m] of moisture concentration was determined by a standard substitution method using the NIST's low frost-point generator (LFPG) and a quartz-crystal-micro-balance.
Repeatability and reproducibility standard deviations in the ... by Kacker, Raghu / Journal of Research of the National Institute of Standards and Technology
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