Re: The differences between LET, SRT and IRT

Jerry wrote:
kenseto wrote:
Bryan Olson wrote:

kenseto wrote:
What is the purpose of the interruptions?
They cut off the light before the spot has a chance to move to the
center, as Seto's theory predicts it will if the light beam is
left on.

Sigh....my theory says: the leading portion of a light beam will miss
hitting the hole in the cover plate due to the absolute motion of the
detecting surface and the cover plate.

Exactly. That's the idea. As Jerry says:

Sure. And with the interruptions, you have LOTS and LOTS of
leading edges.

leading edge! leading edge! leading edge!
V V
V
___________ ____________________ ____________________ ___
|_| |_| |_|

|<------10^-8 sec----->| 10^-10 sec-->| |<--

At a distance of 100 meters, as I recall, it takes 2.7x10^-8 sec
before the beam will shift enough to hit the hole in the cover
plate. So keeping the pulses only 10^-8 sec in duration will
mean that the discontinuous beam never hits the hole.

You didn't have any problem with this concept when I presented
10^-8 sec pulses emitted at a rate of 1000/sec on the "I need
help" thread:

______|__________|__________|__________|__________|___

You wrote:
| "Hey idiot runt.....if there is only 1000 pulses /sec. then the gaps
| between the pulses are much larger than 2.7e-7. This means that all
| the pulses will miss the 3 mm detecting surface. That's why I
| specfied
| a continuous laser. BTW that's the reason for the Uncertainty
| Principle....the absolute motion of the detector makes a short pulse
| of light (or a photon) to miss the detector and that's why you can't
| detect the velocity and the position of a photon simultaneously."

Would you prefer programming the AWG for 1000 pulses/sec instead?
That's fine with me.

But then the spot is much less obvious. The nice thing about a
pattern that keeps the laser on for a significant fraction of the
time is that we can do away with the fancy detector and directly
observe where the spot lands.

I kind of like half-on, half-off, with a frequency less than twice
Ken's leading-edge time. View in a fixed-width font:

______ ______ ______ ______
______| |______| |______| |______|

|<-- 50 ns -->|
(or less)

There will certainly be less problems with heating, and given
that I haven't yet found a commercial Kerr cell with liquid
cooling, that would actually be preferable.


Is the Ker cell really necessary? Google up, laser+modulate+GHz.
Looks like available technology can turn a laser on and off that
fast, or two or three orders of magnitude faster.

Ken would not need a 100-meter hallway to run his experiment. With
modern laser modulation, ten meters, or even *one* meter is enough.
That's actually kind of important, because focusing a laser spot to
about a mm at a 100m range is somewhat challenging.


--
--Bryan
.

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