NASA最近研究出一种用于测量螺栓连接接头预紧力的超声应力测量仪。航天地面设备和飞行结构件上用螺栓和销钉连接的一些重要构件，为保证连接的可靠性，需要精确、可靠地测量螺栓的预紧力。目前市场上供应的仪表大多数情况下使用尚可，但在测量飞行状态下的一些结构件时会出现 NASA recently developed an ultrasonic stress gauge used to measure the pretension of bolted joints. Aerospace ground equipment and flight structural components with bolts and pins connected to some of the important components, in order to ensure the reliability of the connection, the need for accurate and reliable measurement of bolt preload. The current supply of the instrument on the market can still be used in most cases, but in the measurement of some structural parts of the flight status will appear