Schematic of diagram
(Click figure to enlarge)
Position vs phase delay
(Click figure to enlarge)
Note: oscilloscope not included
Features
Compact design
Phase method with high accuracy
Refractive index measurement
Optional media tube
Introduction
The LEOI-24 Apparatus is designed for precise measurement of the speed of light in air or other media using the well-established phase method. This experimental system employs a 100 MHz intensity-modulated optical beam. By measuring the phase delay of a mixed optical signal at 455 kHz, the speed of light is determined with high precision.
The experimental setup includes a corner reflector, which is placed at various positions along a 60 cm rail. By measuring the time delay associated with the signal and applying curve-fitting techniques, the speed of light can be determined with an accuracy of within 5%.
Additionally, this apparatus can be expanded to measure the refractive index of various media, such as organic glass, synthetic quartz, and liquids, by using an optional media tube.
The instruction manual contains comprehensive materials including experimental configurations, principle and step-by-step instructions. Please click Experiment Theoryand Contents to find more information about this apparatus.
Specifications
| Description | Specifications |
| Light Source | Semiconductor Laser<3 mW @ 650 nm |
| Length of Rail | 0.6 m |
| Signal Modulation Frequency | 100 MHz |
| Phase Measurement Frequency | 455 kHz |
| Length of Round-Trip Optical Path | 0 ~ 1.0 m (retroreflector travel 0 ~ 0.5 m) |
| Measurement Error of Speed of Light | 5% or better |
Part List
| Description | Qty |
| Main Unit | 1 |
| BNC Cable | 2 |
| Manual | 1 |
| Transparent Liquid Tube with Support Carriers | optional |
Schematic of diagram
(Click figure to enlarge)
Position vs phase delay
(Click figure to enlarge)
