Physics Lab Equipment

LEOI-24 Apparatus for Measuring Speed of Light

LEOI-24 Apparatus for Measuring Speed of Light

Note: oscilloscope not included 

Features

  • Compact design

  • Phase method with high accuracy

  • Refractive index measurement

  • Optional media tube







Introduction

This experimental system is designed to measure the speed of light in air/media using the well-known phase method. It employs a 100 MHz intensity-modulated optical beam. By measuring the corresponding phase delay of a mixed optical signal at a low frequency of 455 kHz on various locations, the speed of light can be precisely determined by means of curve-fitting within 3% accuracy.

 

In addition, it can be expanded to measure the refractive index of various media such as organic glass, synthetic quartz, and various liquids by using an optional media tube.


Specifications

DescriptionSpecifications
Light SourceSemiconductor Laser<3 mW @ 650 nm
Apparatus Length0.8 m
Signal Modulation Frequency100 MHz
Phase Measurement Frequency455 kHz
Length of Round-Trip Optical Path0 ~ 1.0 m (retroreflector travel 0 ~ 0.5 m)
Measurement Error of Speed of Light≤ 3%


Part List

Description
Qty
Main Unit1
BNC Cable2
Manual1
Transparent Liquid Tube with Support Carriersoptional


     LEOI-24 Apparatus for Measuring Speed of Light.jpg

Schematic of diagram


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