A Simple Low-Cost Lock-In Amplifier for the Laboratory

The construction of a simple, low-cost, stand-alone lock-in amplifier suitable for physical and analytical chemistry instructional laboratories is described. The instrument is useful for detecting and amplifying signals that are in-phase with a reference signal and is particularly important for opti...

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Bibliographic Details
Published in:Journal of chemical education 2005-09, Vol.82 (9), p.1399
Main Authors: Sengupta, Sandip K, Farnham, Jessica M, Whitten, James E
Format: Article
Language:English
Subjects:
Chemistry
Construction costs
Experiments
Instrumentation
Integrated circuits
Laboratories
Laboratory Equipment
Lock in amplifiers
Low cost
Organic chemistry
Science Education
Science Equipment
Scientific apparatus & instruments
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Description
Summary:The construction of a simple, low-cost, stand-alone lock-in amplifier suitable for physical and analytical chemistry instructional laboratories is described. The instrument is useful for detecting and amplifying signals that are in-phase with a reference signal and is particularly important for optical experiments that employ a pulsed light source. The design is based on the Analog Devices AD630 modulator/demodulator integrated circuit and uses a minimum number of components to accomplish input amplification, phase-sensitive detection, low-pass filtering, and amplification of the output signal. The entire instrument may be constructed for less than $100.
ISSN:0021-9584
1938-1328
DOI:10.1021/ed082p1399