Title: Pulsed radiation detector system

Abstract: Disclosed is a fluorescence spectrometer having an intermittently activated sample irradiating source, such as a UV lamp, the periods of activation being short (e.g., 100 microseconds) in comparison to the intervening inactive periods (e.g., 20 milliseconds). Fluorescence radiation emitted by the sample is detected by a photomultiplier, the output signal of which is supplied to an integrating amplifier for utilization. A field effect transistor (FET) in the output circuit of the photomultiplier has its gate coupled to a control unit which determines the activation periods of the lamp and, in timed relation thereto, cuts off the FET to interrupt the output circuit during periods that the lamp is inactive. A dual channel fluorescence spectrometer is also described.

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Inventors: Ford, Michael Alan (Maidenhead, EN)

Application Number: 650635
Filing Date: 1976-01-20
Publication_date: 1977-09-20
Assignee: Perkin-Elmer Limited (Beaconsfield, EN)
Primary Class(es): 250/461.2
Other Classes:
US Patent Ref:

3947683	Mar, 1976	Schultz et al.	250/270.
3975098	Aug, 1976	West	250/461.

Other Refs:
Primary Examiner: Willis, Davis L.
Assistant Examiner:
Attorney: Giarratana; S. A., Masselle; F. L., Crane; J. D.