| Selecting the Proper Measurement Technique Choosing the correct measurement technology requires defining the parameters under which the sensor must operate. The ability of each sensor technology to satisfy the measurement parameters is then analyzed to determine which one is most appropriate. It is important to note that non-contact, displacement measurement sensors measure the gap between the probe face and a target. By monitoring changes in this gap, the absolute target location or target motion through a range can be determined. Advanced calculations can then be made to determine such things as vibration amplitude and phase, the thickness and shape of a piece, or the run-out of a rotating shaft. Each non-contact measurement technology has its own unique advantages and disadvantages. Selecting the proper technology often involves a compromise between sensor performance and the environment in which it must operate. A brief summary of four different non-contact technologies is shown below. |