Author Topic: Fundamentals Friday - A Suggestion  (Read 1354 times)

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Offline German_EE

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Fundamentals Friday - A Suggestion
« on: January 29, 2017, 10:30:44 am »
We haven't had a Fundamentals Friday for some time so  have a suggestion. Yesterday I purchased one of those laser tape measures where you place it on the wall, press the button, and a laser pulse bounces off the opposite wall. You then see a digital display showing the distance.

Light travels at about a nanosecond a foot or 29.9792458 cm per second if you want metric. An HP time/frequency meter is a big beast with a mains power supply yet this unit measures the difference between the start and received pulse and it fits in my hand. So, how does it work?
Should you find yourself in a chronically leaking boat, energy devoted to changing vessels is likely to be more productive than energy devoted to patching leaks.

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Offline T3sl4co1l

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Re: Fundamentals Friday - A Suggestion
« Reply #1 on: January 29, 2017, 10:49:31 am »
For that matter, depth field cameras.

The fundamental at work here is, you can measure phase much more accurately than you can measure a single-event time. :)

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