An in-situ detection sensor and method for ferromagnetic wear particles

Abstract

Abstract The present invention relates to an in-situ detection sensor and method for ferromagnetic wear particles, including an LC oscillating circuit, an inductance-to-digital converter, and a microcontroller, and the LC oscillating circuit includes a sensing coil and a first capacitor coupled to the sensing coil; the detection sensor further includes a permanent magnet, and the sensing coil is arranged on one side of the permanent magnet, when ferromagnetic particles are attracted by the permanent magnet and enter the sensing coil, the inductance of the sensing coil and the equivalent parallel resistance between the sensing coil and the particles are varied accordingly; the inductance-to-digital converter is configured to receive the inductance data and equivalent parallel resistance data output by the LC oscillating circuit, and convert them into a resonant frequency and a proximity output, the microcontroller is configured to receive and process the resonant frequency and proximity data, and further configured to output the processed data externally. The present invention has high detection sensitivity, can also distinguish particle characteristics, provide real-time feedback on the mechanical operating condition, and facilitate timely maintenance by operators.

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