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I Synchronous Sources and Interference

  1. Nov 20, 2016 #1

    bgq

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    Hi,

    What is the scientific definition of "synchronous sources" when we talk about the conditions of interference?

    Thank you.
     
  2. jcsd
  3. Nov 20, 2016 #2

    Tom.G

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    Same Frequency and a Constant Phase relationship between them. ("Usually" the phase difference is assumed to be zero.)
     
  4. Nov 21, 2016 #3

    jtbell

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    Staff: Mentor

    In English, we usually say "coherent" instead of "synchronous" in this context.
     
  5. Nov 23, 2016 #4

    bgq

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    Well, is this mean that "coherent" and "synchronous" are the same? Is it just a linguistic issue?
     
  6. Nov 23, 2016 #5

    jtbell

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    Staff: Mentor

    Where have you seen the term "synchronous sources" in the context of interference? I've never seen it, before this thread. "Coherent" is the standard term, in English-language textbooks etc.

    I said "usually" in my previous post because I wanted to leave myself a loophole in case someone actually gave an example. :oldwink:
     
  7. Nov 23, 2016 #6

    bgq

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    Actually, I have completed two years general physics in university, I have learned that the sources should be coherent (talking about interference).

    A student in the secondary school asked me about synchronous. In his textbook (translated from french), they say about the conditions of interference that the sources should be synchronous and coherent. I tried to understand the word "synchronous" literally, but I cannot find anything that makes a sense.

    It seems from the examples in his textbook, that they mean by "synchronous" having same frequency. But I thing this doesn't make any sense because coherent sources have already same frequency; beside this, I cannot understand how the word "synchronous" could mean having same frequency.
     
  8. Nov 23, 2016 #7

    Ibix

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    I've not heard the term either. But "coherent" could be describing each source as having a well defined frequency and a long coherence time individually, and "synchronous" adding that both coherent sources have the same frequency.

    I guess, anyway. There certainly are linguistic oddities with translated physics.

    The text ought to define its own terms somewhere. I take it there are no helpful index or glossary entries?
     
  9. Nov 23, 2016 #8

    bgq

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    OK, thank you all very much :smile:
     
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