Vibration immunity for a triangular faraday current sensor

Abstract

We demonstrate a common-mode rejection scheme for a bulk-optic triangular Faraday current sensor that can eliminate optical noise induced by fiber-link vibration. The noise floor before applying common rejection was about 30 dB for a 100Å Faraday signal and transceiver vibration levels of approximately 30 g. This was reduced to about 60 dB for the same vibration levels. The sensor's exploitation of Ampere's circuital law is also demonstrated.

Key Words:

• current sensing
• Faraday
• vibration immunity