Hybrid rotational speed detector

A method for wirelessly detecting a rotational run speed of a piece of rotating machinery, the method comprising a processor:

• receiving magnetic flux data from a magnetic flux sensor;
• executing instructions in a memory to apply a fast Fourier transform to the magnetic flux data to generate transformed magnetic flux data;
• executing instructions in the memory to determine a prominent fundamental frequency in the transformed magnetic flux data that falls within a typical range of the rotating machinery;
• receiving vibration data from a vibration sensor;
• executing instructions in the memory to apply a fast Fourier transform to the vibration data to generate transformed vibration data;
• executing instructions in the memory to determine an isolated frequency focal band for the transformed vibration data based on the prominent fundamental frequency in the transformed magnetic flux data;
• and
• executing the instructions in the memory to determine the rotational run speed of the piece of rotating machinery based on the isolated frequency focal band and the transformed vibration data.

A method for wirelessly detecting a rotational run speed of a piece of rotating machinery, the method comprising:

• positioning a hybrid rotational detector device proximate to, but not in contact with the piece of rotating machinery;
• the method further comprising, by a processor of the hybrid rotational detector device:
• receiving magnetic flux data from a magnetic flux sensor of the hybrid rotational detector device;
• executing instructions in a memory of the hybrid rotational detector device to apply a fast Fourier transform to the magnetic flux data to generate transformed magnetic flux data;
• executing instructions in the memory to determine a prominent fundamental frequency in the transformed magnetic flux data from a peak in the transformed magnetic flux data that falls within a typical range of the rotating machinery;
• receiving vibration data from a vibration sensor of the hybrid rotational detector device;
• executing instructions in the memory to apply a fast Fourier transform to the vibration data to generate transformed vibration data;
• executing instructions in the memory to determine an isolated frequency focal band for the transformed vibration data based on the prominent fundamental frequency in the transformed magnetic flux data;
• and
• executing the instructions in the memory to determine the rotational run speed of the piece of rotating machinery based on the isolated frequency focal band and a peak in the transformed vibration data.