A system, comprising: a shaft comprising a shaft axis, wherein the shaft is configured to rotate about a longitudinal axis ; a first capacitive sensor disposed about the longitudinal axis and along a first axis radial to the longitudinal axis , wherein the first capacitive sensor is configured to transmit a first signal based at least in part on a first position of a face of the shaft along the first axis relative to the longitudinal axis ; and a second capacitive sensor disposed about the longitudinal axis and along a second axis radial to the longitudinal axis , wherein the second axis is different from the first axis , and the second capacitive sensor is configured to transmit a second signal based at least in part on a second position of the face of the shaft along the second axis relative to the longitudinal axis ; characterized in that the system further comprises a third capacitive sensor disposed about the longitudinal axis and along the first axis opposite to the first capacitive sensor , wherein the third capacitive sensor is configured to transmit a third signal based at least in part on a third position of the face of the shaft along the first axis ; a fourth capacitive sensor disposed about the longitudinal axis and along the second axis opposite to the second capacitive sensor , wherein the fourth capacitive sensor is configured to transmit a fourth signal based at least in part on a fourth position of the face of the shaft along the second axis; and a controller configured to determine a parameter of the system based at least in part on the first signal, the second signal, the third signal, and the fourth signal, wherein the parameter comprises a location of the shaft relative to the longitudinal axis , a characteristic of a fluid disposed about the shaft , or a combination thereof. a shaft comprising a shaft axis, wherein the shaft is configured to rotate about a longitudinal axis ; a first capacitive sensor disposed about the longitudinal axis and along a first axis radial to the longitudinal axis , wherein the first capacitive sensor is configured to transmit a first signal based at least in part on a first position of a face of the shaft along the first axis relative to the longitudinal axis ; and a second capacitive sensor disposed about the longitudinal axis and along a second axis radial to the longitudinal axis , wherein the second axis is different from the first axis , and the second capacitive sensor is configured to transmit a second signal based at least in part on a second position of the face of the shaft along the second axis relative to the longitudinal axis ; characterized in that the system further comprises a third capacitive sensor disposed about the longitudinal axis and along the first axis opposite to the first capacitive sensor , wherein the third capacitive sensor is configured to transmit a third signal based at least in part on a third position of the face of the shaft along the first axis ; a fourth capacitive sensor disposed about the longitudinal axis and along the second axis opposite to the second capacitive sensor , wherein the fourth capacitive sensor is configured to transmit a fourth signal based at least in part on a fourth position of the face of the shaft along the second axis; and a controller configured to determine a parameter of the system based at least in part on the first signal, the second signal, the third signal, and the fourth signal, wherein the parameter comprises a location of the shaft relative to the longitudinal axis , a characteristic of a fluid disposed about the shaft , or a combination thereof. <EOS>