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Numerical and experimental study of the behaviour of a single-axis fluidic thermal gyroscope

A single-axis, gas thermal gyroscope without proof mass designed, manufactured and then numerically and experimentally characterised is presented in this paper. The working principle of the device is based on deflection of a laminar gas jet generated by the Coriolis effect. A hot gas jet, produced using a micro-pump, passes via a micro-fluidic channel and enters a cavity. Two micro-thermocouples are positioned symmetrically in relation to the jet axis and their differential temperature is measured. The measurement value depends on the rotational velocity applied to the system. A behavioral study of the operation of the gyroscope is carried out experimentally. For that, a system of visualisation is set up using a smoke jet allowing the observation of the deflection of the flow. The influence of the gas (N2) flow velocity on characteristics (sensitivity and measuring range) has been studied and compared with a numerical model. The numerical model developed is in agreement with the experimental results showing that there is an optimal gas flow velocity of 4 m s−1 in order to achieve a compromise between high sensitivity and large measuring range.