定向发射率 directional emissivity
定向发射度 directional emittance
单色定向发射率 monochromatic directional emittance
定向发射体 [光] directional emitter
定向发射装置 aimed launcher
定向发射率谱分布 directional spectral emissivity
定向发射机 [电讯] directional transmitter ; beamtransmitter
光谱定向发射率 directional spectral emissivity
定向干扰自动发射机 rottor
因此带输出波导的正方形谐振腔是一种可以获得单模定向发射的微腔激光器，具有广泛的应用前景。
Therefore the square resonator with an output waveguide is a promising candidate to realize single-mode directional emission microcavity lasers.
一声频定向换能器，以定向发射超声波给接听者，其中该超声频段部分经空气自解调而还原为原音频信号。
Because the ultrasonic wave has the directivity, the audible audio frequency demodulated from the interior of the ultrasonic wave also has the directivity and forms a directional audible sound.
这种新型武器叫做远程定向声波发射器（LRAD）。
This new weapon is called a Long Range Acoustic Device (LRAD) .
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