Fiber Optics Geotechnical Instruments

For a much more detailed understanding of complex geomechanic phenomena in mining or civil projects, YieldPoint offers on a research and commercial basis the world's highest resolution strain monitoring solution. This innovative geotechnical monitoring solution is based on Rayleigh backscatter of light along a single standard telecom optical fiber. Four years of intensive Research and Development have resulted in a combination of physical solutions and technical expertise that can be applied to the most complex problems in geomechanics. For example YieldPoint is able to monitor the 3-D phenomena of shear deformation in rock, not only locating the exact depth of a shearing plane along a borehole in the rock but also determining the exact direction of that movement. YieldPoint can also accurately study multiple shear situations on systems several meters in length. 2 universities, one Canadian and one american, plus the Royal Military College and a large tunnel project in Australia have already taken advantage of this unique and progressive technology.
The standard optical products that YieldPoint has developed can be divided into three application categories:

Ground Support/Geotechnical Reinforcement Monitoring


YieldPoint's fiber optics technology is based on a single optical fiber embedded in the element to be monitored. It is recessed in reinforcing elements such as rockbolts, threadbar, cable bolts and forepoles. The fiber is looped to provide multiple runs of fiber along the same bolt. This enables 3-D resolution of axial and lateral bolt deformation to better understand the effect of shear on the bolt. 
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Ground movement monitoring


YieldPoint has developed a groutable polyurethane rubber probe capable of monitoring 3-D rock mass deformations within a rock mass with 1.25mm spatial resolution along the length of the probe. This provides highly accurate location of areas of stress on the probe, and consequently on rock behaviour such as shearing planes. The probe provides geotechnical engineers and researchers with the opportunity to resolve dilation and shear on individual rock joints.
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Geo-environmental monitoring


YieldPoint's optical technology is equally able to provide high resolution distributed temperature monitoring.  As many as 10,000 temperature measurements can be made along a 10m optical cable. This technology can be used to monitor temperature directly and to closely study phenomena such as water flow and seepage.
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Research services

Our research has been supported by Prof. Sam Spearing at Southern Illinois University at Carbondale and Prof. Nick Vlachopoulos, at the Royal Military College of Canada and Queen's University. The research team is grateful for the assistance of both institutions. Several presented papers are provided here.

YieldPoint Inc. provides mine operators worldwide with tools, technology and service. YieldPoint's Digital (direct-to-digital) sensors combine accuracy and durability while keeping costs low.

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