Frequently Asked Questions

Cheaply producing Ultra Lowest frequencies?

Hello,
I've been following the research of a certain Dr. Fran De Aquino and I'm curious to know how feasible it would be to generate ELF type Infrasound waves with a Hemlholtz generator?

http://users.elo.com.br/~deaquino http://users.elo.com.br/~deaquino/faqs.htm

This idea came from his FAQs page:

"Can sonic waves also change the weight of a body?"

A: As we have already seen, the equation that we obtain by substitution of (53) into (41) is general for any kind of wave including no-electromagnetic waves as the Sonic Waves. This means that Sonic Waves can also change body's gravitational mass and therefore its weight. In this case, the speed n into Eq.(53), refers to the velocity of the sound through the body; f is the frequency of the Sonic Waves and is D the power density of the Sonic Radiation (absorbed or emitted by the body)."

Another curious story on Infrasound and Tibetan Monks: http://www.crystalinks.com/levitationtibet.html

12-24-2004 4:49PM

Tom,
Low frequency acoustic waves have two properties that are difficult to produce. First, the wavelength is long and second, for a reasonable amplitude, the displacement must be large. To produce such waves conventionally, one must have a large source (such as a fireball) with large amplitude displacement (such as an explosion). We have played some with a Helmholtz resonator and do pretty well down to 10 Hz with a resonator that can sit on the back of a pickup truck. We hope to go to 5 Hz with the same device without much increase in size but a decrease in amplitude (now about 100db at 1 M). Continued scaling is possible but the main body of the resonator will begin to vibrate and lower the Q of the resonator (current body is 3/4 inch steel with a total weight of about 1 ton).

H. Bass

12-29-2004 09:35AM