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The Sampled Rectangular Pulse
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Book Chapter
The Sampled Rectangular Pulse
2017
Overview
The sampled rectangular pulse consists of an ideal noiseless rectangular pulse plus additive Gaussian white noise (AGWN). A rectangular pulse is optimally integrated when the integration aperture is perfectly matched to the pulse: it has the same duration as the pulse and is synchronized with it in the obvious way. If the aperture starts before the pulse or ends after it, extra noise is acquired and the signal‐to‐noise ratio (SNR) declines from the optimum. Digital integration and averaging are discussed, relevant signal processing definitions are presented, and noise bandwidth is defined and used. The effects of sampling frequency, area fraction integrated, and pulse‐to‐pulse fluctuations are discussed. A commonly encountered chemical measurement system (CMS) with p‐p fluctuation noises is that of the scanning fluorimeter: even with constant fluorophore content, p‐p fluctuations in the excitation light source cause p‐p fluctuations in the signal response, but not necessarily the background response.
Publisher
John Wiley & Sons,John Wiley & Sons, Incorporated,John Wiley & Sons, Inc
Subject
ISBN
1119188970, 9781119188971
