Experiment of Yu. Ivanov
In the Summer of 1990, a series of experiments with acoustic standing waves was carried out. In the experiments, it was reliably ascertained, that, when the wind velocity increased relative to a motionless irradiator of sound vibrations and a mirror, it was found that compression of the standing wave packet occurs.
Fig. 2. The picture shows cases of calm atmosphere and of strong wind.
Fig. 3. The picture shows schematic diagram of the experiment.
In calm weather, a standing wave between irradiator (1) and mirror (3) was generated (usually, the experiments were started at calm before a thunderstorm). Node of the standing wave shown by solid line was detected by means of indicator (2). When wind occurred, shift of the node toward the mirror (3) was detected. The observed effect was interpreted by compression of the packet of standing waves, (the compressed packet is shown by dots).
Fig. 4. Block-diagram of the device utilized in the experiments: 1 - audio oscillator; 2 - frequency multiplier (*4), serves to form pilot signal; 3 - mixer; 4,8 - dynamic loudspeakers; 5 - microphone for reception of pilot signal; 6 - frequency divider (:4); 7 - restorer of base signal.
Though the frequency of the driving oscillator was not a principle matter in the experiment, it was chosen so that the wavelength was equal to 10 cm, while the distance between the irradiator and the mirror was equal to 70 meters.
When wind occurred, a shift was detected of the monitored node toward the mirror up to 5 cm, which corresponded to a wind speed of about 30 km/h. There were detected greater shift values too, however, the main result of this series of experiments was a clearly observed regularity: when wind occurred, the standing wave packet was compressed independently of whether the wind blew along the device or crosswise.
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