I have an impeller inside a pump housing that is connected to a PM rotor. The pump is a wet-runner, so I cannot access the internals of the pump housing. The pump housing is made of plastic
I suspect that the impeller is moving in the axial direction (Z axis of the shaft, so effectively the shaft is moving up and down)
I need to measure the movement of the shaft
So, I was thinking to order or renting an ultrasonic transducer that can measure the distance to the impeller through the plastic pump housing.
So, the question:
Does anyone know of such an equipment which can measure the distance and output the distance at high speed, so I can capture the speed output in a spectrum analyzer to determine if the shaft is indeed moving?
I was also thinking about laser range measurement, but I suspect that may have to low resolution. The advantage of ultrasonic is that the intermediate medium is water and that probably has well known properties
Another wild shot would be to coat the impeller with metal, and use a proximity sensor to detect the capacitance change when the plate moves up and down.