Monitoring Microinch Displacements in Ultrasonic Welding Equipment

摘要

This communication describes two non-contacting techniques for dynamic measurement of high frequency microinch displacements, which have been applied in monitoring the dynamic displacement of the magnetostrictive transducer system used in ultrasonic welding. One technique consists of a light reflecting scheme that uses a fine fiber optic probe. The probes are available in a range of sizes and, in general, can be used to measure displacements of from zero to 0.030 in. at low frequencies and from 5 to 5000 µin. at any frequency below 100 kHz. The second method, an acoustical technique, leads to results similar to those obtained with the reflective system and can be used with a 0.030-inch diameter acoustic probe; this technique has been used in a frequency range well above that usually associated with probe tube measurements.