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美国罗克威耳国际公司研制了一种新的声-光系统,它用激光束与声波的组合力,以非接触式伸长计测量难于到达的螺栓的长度,通过将松开和拧紧的螺栓进行比较,来决定轴向应变,然后算出螺栓的应力和拧紧扭矩.
A new acousto-optic system has been developed by Rockwell International USA to measure the length of an inaccessible bolt with a combination of a laser beam and an acoustic wave using a non-contact extensometer. The bolt is loosened and tightened Compare, to determine the axial strain, and then calculate the stress and tightening torque bolts.