ES239014U - Detector by electromagnetic loop of metallic bodies in motion, especially vehicles. (Machine-translation by Google Translate, not legally binding) - Google Patents

Abstract

Detector by electromagnetic loop of moving metal bodies, especially vehicles, detector that is of the type composed of a sensor circuit, a receiver circuit and a supply circuit, the first connected to the loop or pickup loop, which is essentially characterized by the fact of being constituted by three modules containing, respectively, the sensor circuit, the receiver circuit and the supply circuit, appearing within the first one an oscillator whose frequency depends on the presence or absence of the metallic body or vehicle on the loop and inside the second a reference oscillator, a phase detector, an integrator and a timer, the aforementioned reference oscillator being combined with an adjustment potentiometer to adapt the device to the loop or loop in question, potentiometer that is accessible from the outside of the module, which also has, externally, a two-position switch for "adjustment" and "operation", a light signal as an indicator signal in said two situations and connections for connection with the sensor module and with the power supply module. (Machine-translation by Google Translate, not legally binding)