Harmonic Synchronous Rectification in Double-Beam Photometry
- 1 February 1953
- journal article
- research article
- Published by AIP Publishing in Review of Scientific Instruments
- Vol. 24 (2) , 125-126
- https://doi.org/10.1063/1.1770638
Abstract
The properties of linearity and phase discrimination of synchronous rectifiers have been widely used in photometry and other electronic applications. A third property—discrimination against harmonically related frequencies—can be used to improve the separation of signals heretofore accomplished by phase discrimination. The principle is analyzed with particular reference to double‐beam photometry, and data obtained by modifying an existing double‐beam photometer are reported. Harmonic synchronous rectification should be especially useful when only very little ``cross‐talk'' can be tolerated or when the relative phase of signals and rectifiers cannot be maintained conveniently with the accuracy demanded by the single‐frequency system.This publication has 1 reference indexed in Scilit:
- A Ratio-Recording Double Beam Infra-Red Spectrophotometer Using Phase Discrimination and a Single DetectorReview of Scientific Instruments, 1950