Device for signalling the position of a mobile member

Device for signalling remotely the state of an apparatus able to assume a plurality of discrete states, comprising:

• means for producing inside a screened enclosure a direct current voltage free of interference, said screened enclosure containing:
• first means for producing from said direct current voltage electrical pulses whose duration is proportional to the value of an inductor which can assume distinct values according to the various states of the apparatus,
• second means for converting said electrical pulses into optical pulses and an optical fiber for transmitting said optical pulses out of said enclosure to a processor, said first means comprising a circuit for producing rectangular pulses of constant duration separated by equal time intervals, an integrator receiving said rectangular pulses, a first inverter receiving the output signals of said integrator and supplying calibrated pulses at its output, a time constant circuit comprising a resistor and said inductor, the output signals of said first inverter being applied to the input of said time constant circuit and to a second inverter, the output signals of said time constant circuit and said second inverter being fed to the input of a third inverter whose output is connected to an amplifier driving said second means.