heterodyne measurement

heterodyne measurement

[′hed·ə·rə‚dīn ′mezh·ər·mənt]
(electronics)
A measurement carried out by a type of harmonic analyzer which employs a highly selective filter, at a frequency well above the highest frequency to be measured, and a heterodyning oscillator.
References in periodicals archive ?
Statistical methods will be developed to evaluate the overall uncertainty of the estimated power and phase spectrum of the oscilloscope and photodiode impulse response functions, and time domain measurements will be compared to heterodyne measurements.
Based on proprietary MEMs technology, the PHOENIX[TM] 1400 product offers best-in-class wavelength precision and tuning linearity, making it ideal for telecommunications test and measurement as well as a variety of other applications including optical frequency domain reflectometry (OFDR) systems, FIBER-BRAGG sensing, metrology, near-infrared spectroscopy and tomography, heterodyne measurements and fiber component characterization for dense wavelength division multiplexing (DWDM).
L-K11), with the expectation that measurements in the pilot and node laboratories be performed by a femtosecond-frequency comb, while measurements in host laboratories may be carried out in either of these ways: as the direct heterodyne measurements between two lasers at the same component (using an acousto-optic modulator for shifting the frequency of one laser, so that the frequency difference can be directly measured), or as matrix heterodyne measurements between two lasers on different components (thus the uncertainty is calculated from several measurements for pairs amongst d, e, f, g components).