| 摘要 |
Proximity detection device for a low-frequency electric field generated by an electric line. According to the invention, a filamentary antenna 16 is arranged along a moving part, such as for example, a lifting arm, of a machine or vehicle to be protected, and the signal generated in this antenna by the proximity of a low-frequency electric line is applied to the input of a differential amplifier 22, which is biased and connected to a feedback circuit R1, C1 making a virtual earth at the inverting input 25 of the amplifier to which the antenna signal is applied. Application to public works. <IMAGE>
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