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Author Topic: Fundamentals Friday - A Suggestion  (Read 2042 times)

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Offline German_EETopic starter

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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?
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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. :)

Tim
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