Shield against induction of sounds from remote source of RF

In summary, a study demonstrated the possibility of inducing sound perception in humans using low power electromagnetic energy. The effect is dependent on carrier frequency and modulation and can be induced at distances of several hundred feet from the antenna. Peak power density is a critical factor, with a minimum of 275 mw/cm2 needed to induce perception at certain carrier frequencies. It is also possible to use materials or a Faraday Cage for shielding, but this will not alter the frequency or phase of the waves. The study also discusses possible sites for the electromagnetic energy sensor and rules out locations peripheral to the cochlea.
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It has been demonstrated that it is possible to make humans hear sounds using waves.

Abstract From Journal of Applied Physiology
The intent of this paper is to bring a new phenomenon to the attention of physiologists. Using extremely low average power densities of electromagnetic energy, the perception of sounds was induced in normal and deaf humans. The effect was induced several hundred feet from the antenna the instant the transmitter was turned on, and is a function of carrier frequency and modulation. Attempts were made to match the sounds induced by electromagnetic energy and acoustic energy. The closest match occurred when the acoustic amplifier was driven by the rf transmitter's modulator. Peak power density is a critical factor and, with acoustic noise of approximately 80 db, a peak power density of approximately 275 mw/ cm2 is needed to induce the perception at carrier frequencies of 425 mc and 1,310 mc. The average power density can be at least as low as 400 μw/cm2. The evidence for the various possible sites of the electromagnetic energy sensor are discussed and locations peripheral to the cochlea are ruled out.

Is there a practical method for shielding? I mean using materials for simple attenuation, and/or altering characteristics of waves (frequency, phase and/or amplitude).
 
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:welcome:

A metal plate provides some shielding. For complete isolation, a closed metal box called a Faraday Cage.. But shielding does not change frequency. Phase is irrelevant.

Note that I did not mention a tin foil hat above. :smile:
 
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1. How does a shield protect against induction of sounds from a remote source of RF?

A shield works by creating a barrier between the remote source of RF and the area it is trying to protect. The shield is typically made of conductive material, such as metal, which can absorb or reflect the RF energy, preventing it from reaching the protected area.

2. What types of materials are commonly used for RF shielding?

The most common materials used for RF shielding include metals such as aluminum, copper, and steel. These materials have high conductivity and are able to absorb or reflect RF energy effectively. Conductive paints and coatings are also used for smaller applications.

3. How can I determine the effectiveness of a shield against induction of sounds from a remote source of RF?

The effectiveness of a shield can be measured using a variety of techniques, such as measuring the level of RF energy inside and outside of the shielded area, or using a spectrum analyzer to analyze the frequencies present in the shielded area. It is important to note that the effectiveness of the shield may vary depending on the frequency and power level of the RF source.

4. Can multiple layers of shielding be used for added protection?

Yes, multiple layers of shielding can be used to increase the effectiveness of the shield against induction of sounds from a remote source of RF. Each layer adds another barrier for the RF energy to pass through, reducing its strength and protecting the area further. However, it is important to consider the added weight and cost of multiple layers when designing a shielding system.

5. Are there any safety precautions I should take when working with RF shielding?

Yes, it is important to take proper safety precautions when working with RF shielding, as it can be hazardous if not handled correctly. This includes wearing protective gear, ensuring proper grounding of the shield, and following safe handling procedures for any materials used in the shielding. It is also recommended to consult with a professional when designing and installing a shielding system to ensure safety and effectiveness.

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