Method to compensate laser fluctuation in photon correlation spectroscopy

A method to compensate the laser power fluctuation in the photon correlation spectroscopy has been developed. In the method, as the key TTL IC element, rate multipliers are used to modulate the sequential digital photoelectron pulses by the parallel digital signal which is processed to be proportion...

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Veröffentlicht in:	Review of scientific instruments 1986-12, Vol.57 (12), p.2983-2986
Hauptverfasser:	Ohbayashi, K., Kohno, T., Fukino, Y., Terui, G.
Format:	Artikel
Sprache:	eng
Schlagworte:	Exact sciences and technology Infrared, submillimeter wave, microwave and radiowave instruments, equipment and techniques Instruments, apparatus, components and techniques common to several branches of physics and astronomy Physics
Online-Zugang:	Volltext
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Zusammenfassung:	A method to compensate the laser power fluctuation in the photon correlation spectroscopy has been developed. In the method, as the key TTL IC element, rate multipliers are used to modulate the sequential digital photoelectron pulses by the parallel digital signal which is processed to be proportional to the inverse of the incident laser intensity. Details of the circuit design are given. To show the usefulness of the method, a case is illustrated in which the ac line noise is compensated in the observation of the Brownian motion of polystyrene latex spheres suspended in water. The bandwidth of the method is estimated to be about 180 kHz.
ISSN:	0034-6748 1089-7623
DOI:	10.1063/1.1139030