Accelerometer including single magnet

An accelerometer system comprising:

• a magnet having a first end and a second end opposite the first end, wherein the magnet is configured to generate a magnetic flux that flows through the magnet from the second end of the magnet to the first end of the magnet;
• a proof mass extending through the magnet;
• a coil disposed around a portion of the magnet;
• and
• processing circuitry configured to:
• receive a signal corresponding to a capacitance of an interface between the magnet and the proof mass;
• and
• cause, based on the signal, a current to flow through the coil, wherein a force corresponding to the magnetic flux and the current maintain the proof mass in a null position.

A method comprising:

• receiving, by processing circuitry, a signal corresponding to a capacitance of an interface between a magnet and a proof mass,
• the magnet having a first end and a second end opposite the first end, wherein the magnet is configured to generate a magnetic flux that flows through the magnet from the second end of the magnet to the first end of the magnet,
• wherein the proof mass extends through the magnet,
• wherein a first coil is disposed around a first portion of the magnet, and
• wherein a second coil is disposed around a second portion of the magnet;
• causing, by the processing circuitry based on the signal, a first current to flow through the first coil;
• and
• causing, by the processing circuitry based on the signal, a second current to flow through the second coil,
• wherein a first force corresponding to the magnetic flux and the first current and a second force corresponding to the magnetic flux and the second current maintain the proof mass in a null position.