Detectors of parameters adapted to act on the force of attraction between an electret and an electrode
OwnerGerard Dreyfus, Jacques Lewiner +1inventors
InventorsGerard Dreyfus, Jacques Lewiner, Didier Perino
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Abstract
The device is able to detect the exceeding of a given threshold by a parameter, other than an electric voltage, capable of affecting the electrostatic force of attraction exerted between a charged electret and one, of two electrodes between which said electret is placed, said parameter being for instance an ionizing radiation. The two electrodes are at the same electric potential and the device also comprises return means for urging the first electrode and the electret permanently apart, and means for using the relative displacement of said elements, when it occurs, for desired detection purposes.
Claims16
A device for detecting the exceeding of a given threshold by a parameter capable of affecting the electrostatic force of attraction exerted between a charged electret and one of two electrodes between which said electret is disposed, the parameter being other than a difference in electrical potential, and the two electrodes being at the same electrical potential, said device comprising means for enabling said parameter to affect said electrostatic force of attraction, return means for exerting an opposing force to said electrostatic force of attraction which serves to bias the said one electrode and the electret apart and detection means for detecting the relative displacement of the one electrode in relation to the electret which occurs when said electrostatic force of attraction becomes less than the opposing force of the return means.
Dependencies are inferred from the claim text.