Re: A way to measure OWLS...and verify the constancy of the one way speed of light

"rotchm@xxxxxxxxx" <rotchm@xxxxxxxxx> wrote:

>Could you restate your experiment for me, removing all superflouus
>devices. Make it a thought/ideal experiment.
>Is the fibre cable necesary, the lens? I dont need to know the +- 1
>pulse accuracy either etc.
>
>I ask you this bcause I would like to take a shot at it but I want to
>make sure I understand correctly the whole situation. So removing
>unnecesary concepts will minimize misunderstandings.
>
>Thanks.
>
The concept is easy. Use one clock, two counter circuits, a laser,
optical receiver, and a one second trigger circuit all co-located in a
single box. One counter has a preset count that is adjustable that
once that count has been reached, it will send a *start counting*
pulse to the second counter. The second counter will start counting
when it gets that pulse and stop counting when the laser beam is
*received* at the optical receiver circuit. The length of fiber optic
cabel is initally attached to the receiving lens for calibration.

Let's say the fiber optic cable is 1000 meters long and the main
oscillator is running at 300 mhz, and the speed of light is 300
million meters per second.

The trigger fires the laser and the first counter. Light speeds down
the 1000 meters of cable, while the first counter ticks away. Light
reaches the receiver in 1000 ticks of the first counter. You adjust
the preset so that the first counter will *tell* the second counter to
start counting as soon as the first counter counts up to 1000. With
this calibration, the second counter won't get to count, be cause as
soon as it gets the signal to start counting, the receiver circuit
will disable it's ability to count.

Now seperate the end of the fiber optic cable from the receiver ...
say a distance of 300 meters. The first counter starts counting, when
the light reaches the end of the cable, the first counter has reached
1000, and sends the signal to the second counter to begin counting.
Light travels from the end of the fiber optic cable to the receiving
lens, a distance of 300 meters = 300 counts on the second counter.
The light hits the receiver and stops the count on the second counter
which now displays a count of 300.

Move the cable end to a distance of 600 meters and the second counter
will display 600, move it to 1000 (less an inch so we can aim it back
to the receiver) and it will read ~1000.

Simple OWLS measuring device....to get higher accuracy, you can
increace the frequency of the oscillator and/or the length of the
cable. A couple of problems with accuracy though....distance
measuring...creating a temperature and vibration stable vacuume
environment for accurate measurments.

"The lack of reason is overcome by the passion of belief"
< cj@xxxxxxxxxx >
.

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