engleski

LOCK-IN AMPLIFIER IN NIR REFLECTANCE MEASUREMENT SYSTEM

The electronic circuits to which a detector is connected conditions the signal output further from the detector. Knowledge of the modification to this signal imposed by measuring circuit is important for accurate use of the detector signal. An electrical output signal from a detector that is proportional to the flux incident upon a detector is of little value if it is exceeded by the random electrical fluctuations, known collectively as noise, produced by a variety of sources. Some noise generated in the post detector electronics, or in detector itself, can be special techniques. Methods have been devised both to reduce noise levels and to avoid some of their limitations on detect ability.

noise; filter; lock-in; detection; PSD

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