Laser Flow Sensor for Lubricating Oil

Michele Norgia, Alessandro Pesatori

Abstract

This work describes the development of a laser instrument for measuring the flow speed of oil, for minimum-quantity lubrication. The sensor is the laser diode itself, placed on the oil tube without any lens, acting as a self-mixing interferometer. The dyes inside the oil induce a back scattering of the emitted light, and generate a Doppler signal, measured by the laser monitor photodiode. Through a suitable elaboration of the signal spectrum, it is possible to estimate the oil flow; this measurement is essential for the correct maintainability of machine tools.

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DOI

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IMEKO TC

TC10 - Measurement for Diagnostics, Optimization and Control

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