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Physics 111: Low Light Signal Measurements (LLS)

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Published on Mar 7, 2012

Physics 111 Advanced Laboratory. Professor Sumner Davis

This video accompanies the Low Light Signal Measurement Experiment, providing students with an introduction to the theory, apparatus, and procedures.

The main goal of this lab is to measure the output power of a low-intensity LED from across the room in daylight. You will become acquainted with some common laboratory equipment, signal detection with a phase-sensitive lock-in amplifier, a spectrum analyzer, an FFT, and others. You will learn about 1/f noise sources in laboratory measurements, and pick up some basic measuring techniques. The lab is organized so that you will perform many "mini" experiments leading up to the main challenge of measuring the output power of an LED.

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