An Etymological Dictionary of Astronomy and Astrophysics
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فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory

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Number of Results: 6 Search : heterodyne
heterodyne
  هترودین   
heterodin (#)

Fr.: hétérodyne   

1) Denoting a device or method of combining two → electromagnetic waves of different → frequency (a locally generated wave and an incoming wave) in a → nonlinear device to produce two frequencies which are equal to the → sum and → difference of the first two. The phenomenon is the counterpart of → beats produced by → sound waves. For example, heterodyning a 100-kHz and a 10-kHz signal will produce a 110-KHz and a 90-kHz signal. See also → homodyne.
2) The term heterodyne is often loosely used instead of → superheterodyne in the radio frequency field.

Heterodyne, from → hetero- + -dyne, from Gk. dynamicsdynamics; → receiver.

heterodyne interferometer
  اندرزنش‌سنج ِ هترودینی   
andarzaneš-sanj-e heterodini

Fr.: interféromètre hétérodyne   

An → interferometer using a technique that involves introducing a small → frequency shift between the optical frequencies of the two interfering light beams. This results in an intensity modulation at the → beat frequency of the two beams for any given point of the → interference pattern. A convenient way of introducing such a frequency shift is by means of an acousto-optic modulator.

heterodyne; → interferometer.

heterodyne receiver
  گیرنده‌ی ِ هترودینی   
girande-ye heterodini (#)

Fr.: récepteur hétérodyne   

superheterodyne receiver.

heterodyne; → receiver.

heterodyne technique
  تشنیک ِ هترودین   
tašnik-e heterodin

Fr.: technique hétérodyne   

superheterodyne technique.

heterodyne; → technique.

superheterodyne receiver
  گیرنده‌ی ِ اَبَر-هترودینی   
girande-ye abar-heterodini (#)

Fr.: récepteur superhétérodyne   

A radio receiver which uses the → superheterodyne technique.

super-; → heterodyne; → receiver.

superheterodyne technique
  تشنیک ِ اَبَر-هترودین   
tašnik-e abar-heterodin

Fr.: technique superhétérodyne   

The technique used in a radio receiver in which the frequency of an incoming signal is changed by adding it to a signal generated within the receiver to produce fluctuations or beats of a frequency equal to the difference between the two signals. See also → mixer.

superheterodyne receiver; → technique.