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  Home > JCE Print > Journal of Chemical Education > Issues > 2005  > September  >
In the Laboratory
Topics in Chemical Instrumentation
A Simple Low-Cost Lock-In Amplifier for the Laboratory
Sandip K. Sengupta, Jessica M. Farnham, and James E. Whitten
The Department of Chemistry and Center for Advanced Materials, University of Massachusetts Lowell, Lowell, MA 01854
Cover
September 2005
Vol. 82 No. 9
p. 1399
Abstract
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.
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A detailed list of parts is available.
*  Contents JCE2005p1399W.doc (Microsoft Word)
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JCE2005p1399W.pdf

JCE2005p1399W.zip
More Information
*  Citation
 Sengupta, Sandip K.; Farnham, Jessica M.; Whitten, James E. J. Chem. Educ. 2005 82 1399.
*  Keywords
 Analytical Chemistry; Instrumental Methods; Laboratory Equipment / Apparatus; Physical Chemistry
*  History
 Created:
Last Updated:		 August 2, 2005
August 10, 2005
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