Dr P. Russhard, Rotadata Ltd, Derby, UK. 2015
At constant speed, non-vibrating blade tips pass the probes at equal intervals of time on each revolution. However, vibrating blades will reach the probes slightly later or earlier. Taking the difference between the expected and actual arrival times allows the calculation of individual blade tip displacements at the probe.
In order to obtain the data some method of accurately detecting the revolution time and the blade arrival times are necessary. In many applications of BTT the casual attitude to collecting data has led to a total loss of analytical capability once the test has been completed. System installations which seem trivial at first can quite easily lead to a loss of data.
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