We have done an in-depth investigation on how damp masonry responds to artificially generated external electromagnetic fields. Using a commercial function generator we applied to our test wall a wide variety of regular and irregular wave forms and pulses - both modulated and non-modulated.
We have found that certain electromagnetic frequencies applied in the vicinity of our test walls through a small antenna can change the moisture content of the wall fabric.
The Response of the Wall Fabric to Electromagnetic Fields
Here is the response of the wall fabric to a frequency band. We can see two frequencies for which the current increases significantly giving a nice Gaussian bell-shape distribution curve.
If we expose the masonry to the same frequency band a number of times, the masonry's response is always the same. For e.g. here the test has been done 3 times in a row, producing the same consistent response every single time.
Certain frequencies consistently affect multiple parameters in the brickwork, as shown below, in response to multiple tests.
One of the parameters these frequencies can affect is HUMIDITY. Here the embedded moisture sensors inside the brickwork have registered a drop in humidity (red line below) for that brief amount of time when the right frequency has been applied to the walls - performed twice in a row.
The same experiment done again: now some frequencies affect a different moisture sensor (drop in the green line) when the currents rise.
As we can see, the humidity in the damp wall fabric can be reduced by nearby electromagnetic frequencies, opening the door to practical applications of non-invasive moisture control.
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