11. The Photonic Fence uses a non-lethal laser to track insects and monitor their wing-beat frequency . 12. By recording the beat frequency over time, a complete velocity history of the surface is obtained. 13. In order to make the carrier pulses audible in the receiver, a beat frequency oscillator is used. 14. One function of the Johnston s organ is for detecting the wing beat frequency of a mate. 15. The low-frequency beat frequency of the superimposed scatter radiation which corresponds to the Doppler frequency " f" 16. By using sources of several wavelengths to generate sum and difference beat frequencies , absolute distance measurements become possible. 17. Beat frequency obtained from the interference of a 193.4 THz EM wave with a 193.40032 THz EM wave.18. In physics-speak, the moire effect is " a beat frequency between two other frequencies creating an interference pattern," 19. This beat frequency is slow enough that it can be monitored with a simple photo-detector and high speed oscilloscope. 20. First, Heterodyned signals are beat frequencies between the signal source and a reference source ( dubbed local oscillator LO ).
