Riley E. Alexander, Maya M. DiFrischia, Margaret J. Doubman, Stefany Fabian Dubon, Lily Goltz, Yuqian Li, Rebecca A. Long, Genevieve Love, Nina Martinez Diers, Matangi Melpakkam, Catie Robinson, Elizabeth M. Tompkins, Avalon L. B. Vanis, Xinrui Wang, Mallory Yu, Sarah E. Spielman, Michael W. Noel
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引用次数: 0
Abstract
Lock-in detection is a widely used experimental technique in which a weak signal is measured by modulating it at a particular frequency. Then, by detecting an experimental output at that frequency, the desired signal can be isolated from much larger-amplitude noise. Here, we report on the implementation and optimization of a homemade laser barcode scanner based on the lock-in technique. Our setup is comprised of components that are readily available in an undergraduate instructional laboratory. The successful transcription of the barcode into a digital signal was achieved, and this digital signal was collected with a simple computer and processed to reveal the encoded number.
期刊介绍：
The mission of the American Journal of Physics (AJP) is to publish articles on the educational and cultural aspects of physics that are useful, interesting, and accessible to a diverse audience of physics students, educators, and researchers. Our audience generally reads outside their specialties to broaden their understanding of physics and to expand and enhance their pedagogical toolkits at the undergraduate and graduate levels.
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