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ELECTRIC FIELD SENSOR WITH STABILIZED INTERFEROMETRIC READOUT

Measuring the static (DC) electric field has always been challenging, because the measurement system can interfere with the field it measures. Therefore, optical readouts such as a Michelson interferometer can be used in combination with a transducer that converts the quantity electric field strength into an out-of-plane vibration with an amplitude that is proportional to the field strength. For such a system, a stable working point needs to be maintained. Due to different effects including thermal fluctuations in the optical fibers the working point is constantly drifting. Therefore, a stabilization of the working point at a fixed value of the optical phase is absolutely necessary. This paper describes a feedback mechanism that measures and controls the working point at a fixed value. We compare three setups. The first one without stabilization substantiates the need for the stabilization. The second one using a piezoelectric buzzer as a proxy to test the stabilization. In the third one, we used the actual electric field transducer. This shows a new way of a backaction-free readout of electric field transducers.