Method for the inductive generating an electric monitoring signal for the determination of the path and / or the position in space and / or of the material properties of a specimen and after this process, in the proximity sensor and the use of the same as in further detail as switch

摘要

the invention concerns a method for inductive production of electrical signal to determine the path and / or position in space and / or material properties of detektierenden, electrically conductive body using at least two inductively coupled coils, treiberspule and sensorspule,of which the treiberspule from a higher frequenten ac earlier, in the sensorspule of size dependent voltage to be measured and a current induced in the treiberspule proportional spannungssignal, referenzspannungssignal is produced and both sp annungssignale receiving the signal to be linked together.from the referenzspannungssignal (uref) and the spannungssignal (us) of the sensorspule means the measurement signal (ua) wonin the mathematical schaltungstechnische link amount and phase of the referenzspannungssignals (uref) are eliminated, and thus the dependence on the current (it) of the treiberspule will be eliminated and only the change of the amount of (/ us /) and the phase () of the spannungssignals (us) sensorspule as parameters of the measurement signal (ua) remainthe proportion of the complex power (pt) in the magnetic field of the treiberspule, with the complex power (ps) within the sensorkreises constant, preferably almost negligible small is held.