Compressive strain and tensile stress determining appts. for measuring snow profile - has measuring instruments at various depths in material arranged to be coupled to material and to measurement output

摘要

The measurement device determines the compressive strain and tensile stress inside a material. Measuring levels (7) are provided at different depths inside the material or workpiece (3). Each level (7) has a measuring device (1) including a measured value output (6) and a pressure device (2, 4a-c, 6) for coupling the output (6) to the material or work piece (3). The outputs (6) of each measuring device (1) are arranged to measure linear shape changes in different directions. The pressure device coupler (2, 4-c, 6) has a probe (2) on the side adjacent the material (3) and a pressure device (4a-c) on the other side. The measurement output (6) is arranged between these. A temperature sensor transmits its findings via ultrasound or microwave. USE/ADVANTAGE - Even relatively small stresses, esp. in layers, can be accurately measured. Can determine, e.g. hardness of snow at different depths more quickly.