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
J. Chem. Educ., 2005, 82 (9), p 1399
DOI: 10.1021/ed082p1399
Publication Date (Web): September 1, 2005
History, Education, and Documentation

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.

Keywords (Audience):

Second-Year Undergraduate

Keywords (Domain):

Analytical Chemistry

Keywords (Feature):

Topics in Chemical Instrumentation

Keywords (Subject):

Instrumental Methods
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  • Received: August 03, 2009

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