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Experimental study on the influence of coil diameter on double coil multi-parameter impedance detection sensor

This paper introduces the detection principle of the double coil multi-parameter impedance detection sensor. The influence of the coil diameter on the experimental results is studied when the double coil multi-parameter impedance detection sensor detects the hydraulic oil. The author made a double coil multi-parameter impedance detection sensor and set up the detection platform. Under different coil diameter conditions, the detection signal values were compared and analyzed. The experimental results showed that the inductance signal of the same iron particle decreases with the increase of the coil diameter when the inductance of the same iron particles is detected, and the signal-to-noise ratio of the inductance signal decreases with the increase of the coil diameter. For the capacitance detection of the same bubble and water droplets, when they pass the capacitor, the relationship of the amplitude of the the capacitance and the coil diameter is not large, but the signal-to-noise ratio of the amplitude signal decreases with the increase of the coil diameter. The result of this study is a great reference value for improving the detection accuracy of the double coil multi-parameter impedance detection sensor.