The development of accurate absolute distance interferometers is a long-term research goal. The key impact of this paper is the development of an absolute distance interferometer based on the optical feedback into a superluminescent diode cavity. The proposed approach employs a two arms interferometer feeds by a superluminescent diode. Thanks to the optical feedback, we obtained huge interference fringes even with diffusive targets. The proposed signal processing exploits a zero-crossing approach to determine the absolute target position. Preliminary results show a ratio between measurement uncertainty and range of about 50 ppm.

Optical feedback into a superluminescent diode cavity for absolute distance measurements / Rovati, L.; Cecilia, L. D.; Cattini, S.. - 2019-(2019), pp. 1-5. ((Intervento presentato al convegno 2019 IEEE International Instrumentation and Measurement Technology Conference, I2MTC 2019 tenutosi a nzl nel 2019 [10.1109/I2MTC.2019.8826828].

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