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Ultrasonic bolt stress measurement device

Norbar Torque Tools presents USM-3 Ultrasonic Stress Meter. The core principle behind this technique of tension control is same as sonar. For measuring bolt tension ultrasonically, a sonic pulse is introduced at one end of the fastener. This pulse performs accurate measurements of the TOD (time of flight) needed for return of the echo from the other end.

USM?3 uses material constants for conversion of this TOF into the fastener's ?acoustic length?. This serves as a baseline for making future measurements. Upon tightening of the fastener, the TOF goes up. The material constants are again utilized by the USM ? 3 for elimination of any impact of stress and temperature changes on sound velocity. This way, a precise measurement of elongation or load is provided.

The USM -3 utilizes cutting edge hardware and digital signal processing. This way, it gets these measurements with highest level of automation and minimal operator involvement.

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