ISSN:
1089-7623
Source:
AIP Digital Archive
Topics:
Physics
,
Electrical Engineering, Measurement and Control Technology
Notes:
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.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.1139030
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