 Fig. :Vibration measurement system. |
Unlike conventional transducers such as accelerometers, microwave vibrometer is completely non-contact and is not affected by the shape and material properties of reflecting surface as well as by the environmental conditions such as temperature or pressure. The microwave vibrometer is a system for automated vibration measurements and offers large dynamic range (1 - 100 µm) which is satisfactory for most applications. It has high linearity of output signal, good measurement accuracy, virtually no limit on upper frequency and can identify manufacturing defects by comparing the measured vibrations with stored reference spectra. Besides, the microwave vibrometer can be used to measure displacement of fastly rotating objects (magnitude and frequency) of cylindrical or conical shape. Roll diameter, shape and distance (to some extent) to the object do not influence the measurements. Typical distances from antenna to the reflector may be of 5 to 30 centimeters. Since the area in the space illuminated by the antenna at short distances is about 3x3 cm2, care must be taken that only vibrating component is irradiated to avoid errors.
Abstract Source:
Book of Abstracts, 7th European Conference on Non-Destructive Testing, 26-29 May 1998, ISBN: 87-986898-0-00
Full-Text Source:
Proceedings of the 7th European Conference on Non-Destructive Testing, 26-29 May 1998, ISBN:
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