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Definition of "Critical Frequency" |
The maximum frequency at which a radio wave can be transmitted vertically and still be refracted back to earth. / In radio propagation by way of the ionosphere, the limiting frequency at or below which a wave component is reflected by, and above which it penetrates through, an ionospheric layer. / Fiber optic probes can be coupled with any FTIR spectrometer by standard fiber coupler produced by manufacturers of FTIR spectrometers and FTIR accessories. art photonics can provide customized fiber couplers / launches for various FTIR models with or without sample chamber. / the rate of picture presentation, as in a video system or motion picture display, above which the presented image ceases to give the appearance of flickering. The critical frequency changes as a function of luminance, being higher for higher luminance. |
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