SPEED OF LIGHT MEASUREMENT
With Industrial Fiber Optics' Speed
of Light Apparatus, measuring the speed of light is now
easy and quite accurate. Such was not the case for many
centuries. The famed Galileo - after he attempted to measure
the speed of light with an unlikely arrangement of lanterns
and flags on tall towers - decided that light must travel
at infinite speed. Later, Armande Fizeau used an elaborate
mechanism with mirrors, lens and a huge rotating cogwheel
to determine if the speed of light was, in fact, not infinite.
He got close. After many years we now know light does not
travel at infinite speed, but rather 299, 792.4562 meters
per second in a vacuum.
With the proper combination of electronics,
electro-optics and fiber optics this once-difficult measurement
is simple and can be conducted in any lab or classroom.
All that's needed is a 60 x 100cm table, 110 VAC electrical
power, oscilloscope and the Speed of Light Apparatus.
To conduct this experiment, first apply
110 VAC power to the oscilloscope and Speed of Light Apparatus,
then connect oscilloscope probes to apparatus test points.
After calibration, the oscilloscope monitors the reference
and delayed pulses, the time delay is measured and the speed
of light calculated.
An integral part of the Speed of Light
Apparatus is an easily understood full-color, often lighthearted
manual. It begins by tracing the early steps of technical
pioneers in their quest to understand light. The manual
also includes detailed step-by-step set-up and measurement
instructions and examples with equations for calculating
the speed of light. In addition, assembly instructions are
included for those who purchase this as a kit.
(The apparatus consists of an electronics
circuit board in protective plastic enclosure, two fiber optic
cables, test connections for all outputs and a VAC-to-DC power
adapter. The optical fibers terminate in simple cinch-collet
connectors for easy assembly and efficient coupling. A 20
MHz oscilloscope is required.)
- All solid-state transmitter/receiver
- Low-voltage electronics operation
- Fiber optic delay requires no optical
- Safe, visible LED light source
- Quick set-up and measurement
- Impact-resistant, protective enclosure
- Rubber feet on chassis bottom for adhesion
on smooth surfaces
- Contained light beam is ideal for small
- 28-page full-color manual with step-by
step assembly, operation instructions and sample oscilloscope
us for more information.