20130054156 | STRAIN MEASURING AND MONITORING DEVICE - The present disclosure provides a strain measuring and monitoring device with displacement sensors for measuring and monitoring the levels of strain and load forces experienced by metallic bars, such as reinforcing bars or rock bolts. The strain measuring and monitoring device includes an array of displacement sensors that directly measure the induced displacement or stretch of the metallic bar being measured over an extended base length. Upon dividing the measured displacement by this longer base-length, an average strain is determined. | 02-28-2013 |