Abstract
To figure out the temperature drift problem in a dual coil eddy current displacement sensor (DC-ECDS) which is widely applied in food industry, the structure and working principle of DC-ECDS was descripted first. Then, the influence of the working temperature of the DC-ECDS on the difference signal from the dual coils was deeply investigated by the numerical simulation and experimental study. By the investigation, the temperature-invariant phenomenon (TIP) was found in the embedded DC-ECDS and non-embedded DC-ECDS. The interesting thing was that in the temperature invariant region (TIR), the impact of the working temperature on the difference signal could be neglected. Next, we found that the location of TIR was dependent of the excitation frequency and the geometric size of the electromagnetic shielding ring of the DC-ECDS. Finally, the TIP was applied in designing a novel eddy current limit switch, which exhibited the stable output regardless of working temperature change.
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