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An optical borehole imaging system is an advanced imaging tool used in geotechnical investigations to capture high-resolution, continuous 360° images and video recording of borehole walls. It employs a high-resolution camera and LED lighting to provide detailed visual data of geological features, such as fractures, bedding planes, dip angle, dip direction and rock fabric. This device is particularly valuable for structural analysis, as it delivers precise orientation and inclination data, allowing geologists and engineers to assess rock stability, lithology, and subsurface conditions accurately. Its non-destructive, in-situ imaging enhances understanding of the subsurface, supporting reliable decision-making in construction, mining, and groundwater studies.
The applications of optical borehole imaging systems are as diverse as they are impactful. From rock fracture analysis that reveals the intricate network of cracks and fissures under deep ground, to construction site evaluation that ensures the stability and safety of future structures, this technology is an indispensable ally in the geotechnical toolkit.
The optical borehole imaging system captures ultra-clear, 360° images of borehole walls in real-time, delivering unmatched detail for geotechnical assessments. Featuring a high-speed digital camera capturing maximum 60 frames per second, this device ensures every frame is precisely calibrated for true-to-life color accuracy. An innovative prism enables the camera to capture seamless 360° views of the entire borehole wall, while a powerful LED ring illuminates the borehole, enhancing visibility and image quality. Perfect for capturing structural data with pinpoint accuracy, the optical borehole imaging system supports confident, data-driven decisions for accurate structural and geological analysis.
Orientation of the image data
Orientation of the image (by orientation we mean a Magnetic North reference or a reference to the high side of the borehole) is achieved using a three axis magnetometer and a three axis accelerometer inside the probe.
After data acquisition, borehole imaging technology enables precise identification of structures intersecting the borehole. Each structure’s dip angle and dip direction can be individually measured with high accuracy. The “unwrapped image” format, which displays the borehole wall as a continuous, flat image, allows dipping structures to appear as sine curves. From these curves, the dip angle and dip direction relative to the borehole can be calculated.
Once image data is acquired, borehole imaging technology enables precise identification of structures intersecting the borehole, with individual measurements of dip angle and dip direction. Each structure is oriented, classified, and prepared for output as a detailed list and/or a stereographic projection. When combined with additional geophysical or geological borehole data, a 3D representation of the borehole is created, offering a comprehensive view of subsurface structures.
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