Conoscopic Holography looks to be an interesting approach for vibration monitoring at low frequencies, between 0 and 50 Hz, where the sensitivity of other sensors decreases. Low vibration frequencies (between 0 and 30 Hz) in the car appear to be directly related to the gas pressure or, in other terms, be related by a first order transfer function with the input gas flow rate. High vibration frequencies in the car cannot be adequately obtained with C.H. sensor. With accelerometers, it can be seen that they are more related to the gas flow rate, but not with the movement inside the ladle. Following the previous conclusions, it appears as an important item for the project to determine which frequencies are more meaningful to know the real stirring in the bath.
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