Using lock-in detection to build a barcode scanner

被引：0

作者：

Alexander, Riley E. ^{[1
]}

DiFrischia, Maya M. ^{[1
]}

Doubman, Margaret J. ^{[2
]}

Dubon, Stefany Fabian ^{[1
]}

Goltz, Lily ^{[1
]}

Li, Yuqian ^{[1
]}

Long, Rebecca A. ^{[1
]}

Love, Genevieve ^{[1
]}

Diers, Nina Martinez ^{[1
]}

Melpakkam, Matangi ^{[1
]}

Robinson, Catie ^{[1
]}

Tompkins, Elizabeth M. ^{[1
]}

Vanis, Avalon L. B. ^{[1
]}

Wang, Xinrui ^{[1
]}

Yu, Mallory ^{[1
]}

Spielman, Sarah E. ^{[1
]}

Noel, Michael W. ^{[1
]}

机构：

[1] Bryn Mawr Coll, Dept Phys, Bryn Mawr, PA 19010 USA

[2] Haverford Coll, Dept Phys & Astron, Haverford, PA 19041 USA

来源：

AMERICAN JOURNAL OF PHYSICS | 2023年 / 91卷 / 12期

基金：

美国国家科学基金会;

关键词：

AMPLIFIER; NOISE;

D O I：

10.1119/5.0151621

中图分类号：

G40 [教育学];

学科分类号：

040101 ; 120403 ;

摘要：

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.

引用

页码：1023 / 1030

页数：8

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