The centimeter-gram-second (cgs) unit of force (symbol dyn) that imparts an acceleration of 1 cm s-2 to a mass of 1 gram. 1 dyn = 10-5 → newton.
From Fr., from dynamis "power," → dynamics.
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.
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.
girande-ye heterodini (#)
Fr.: récepteur hétérodyne
Fr.: technique hétérodyne
girande-ye abar-heterodini (#)
Fr.: récepteur superhétérodyne
A radio receiver which uses the → superheterodyne technique.
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.
Of a comet, a curve of points calculated assuming dust grains are emitted continuously at successive instants with a constant value of the radiation pressure to gravitational attraction; also called syndyname. → synchrone.