Patent ID: 8400145

Claim:
A sensor comprising: a first section comprising a ferrous component; a second section comprising first and second wire coils separated by a predefined distance; a component configured to flexibly connect the first section to the second section; an oscillator configured to generate a source signal; a comparator comprising three inputs, a first input is coupled to the oscillator; a processor coupled to an output of the comparator, the processor configured to generate an output signal based on signals received from the comparator; and an output device coupled to the processor, the output device configured to receive the generated output signal and provide a presentation based on the received output signal, wherein the ferrous component is received through the first and second wire coils, wherein the first and second sections are attached to a device-under-test, wherein the first and second wire coils are connected in parallel and the oscillator is connected to an input of both wire coils, wherein a second input of the comparator is coupled to the first wire coil and a third input of the comparator is coupled to the second wire coil.