EnglishViews: 1 Author: Site Editor Publish Time: 2025-10-30 Origin: Site
Drilling imaging technology has become a core tool for underground visualization. The GYGD-IV drilling multi-functional imaging system achieves reliable underground observation by integrating optical, mechanical, and data processing technologies. Its working principle is specifically elaborated as follows:
The GYGD-IV system adopts optical imaging as its core, which is the foundation for capturing clear borehole wall images.
The probe is equipped with a 1/3-inch color CCD Charge-Coupled Device sensor with a sensitivity of 0.1 Lux. This sensor converts the light reflection signals from the borehole wall into digital electrical signals, enabling clear imaging even in low-light environments such as deep wells and drill holes filled with turbid liquids. It can accurately capture micro-features such as rock fracture widths ≥0.1 mm and pile sediment thickness ≥1 mm, providing a basis for quantitative geological analysis.
The lens supports 360° horizontal rotation and 180° tilt adjustment and can stay at any position freely. A manual focus function allows operators to refine image clarity for specific targets, eliminating "blind spots" in fixed-lens systems. This design ensures continuous 360° full-circumference observation of the borehole wall, which is critical for avoiding missing geological information during exploration.
The system features an 8x digital zoom function. When activated, it magnifies localized areas without compromising image quality, enabling detailed inspection of small-scale features e.g., mineral filling in fractures. This functionis essential for well maintenance and geothermal reservoir evaluation, where micro-defects affect project safety.
Optical imaging depends on stable lighting. The GYGD-IV system is equipped with a front-mounted LED patch light array with 8-level brightness adjustment per "Probe Specifications" in the document:
In clear water-filled boreholes, low brightness Levels 1–3 avoids overexposure; in turbid or deep wells, high brightness Levels 6–8 ensures sufficient light penetration to capture clear wall reflections.
Paired with the system’s low-power embedded dual-core processor, the LED array minimizes energy consumption, supporting 8 hours of continuous operation with a portable 220V generator suitable for remote sites like mining areas.
Accurate depth correlation is key to borehole imaging. The system integrates a dedicated depth counter range: 0–9999m and a calibration mechanism :
The depth counter links to a synchronous wheel on the winch cable. As the cable is lowered/retrieved, the wheel rotates, and its revolutions are converted into linear depth readings. The cable’s 250KG tensile strength minimizes stretching, avoiding measurement errors.
To correct deviations e.g., wheel wear, specifies a 10m cable calibration method:
Mark the start/end points of a 10m cable segment;
Lower the probe to the wellhead and reset the depth counter to 0;
Pull the cable to the 10m mark and check the displayed depth;
Adjust the "synchronous wheel perimeter" default: 72mm — reduce it if the display >10m, increase if <10m — until the error is within ±0.1m.
The system uses a low-power embedded dual-core processor to process image data, which is directly stored in a USB flash drive . This design ensures simple operation no on-site complex processing and data security avoids wireless transmission loss in remote areas.
The transmission cable adopts a double-layer insulation structure inner TPU + outer nylon braiding. This prevents water ingress a major system failure cause and withstands 250KG tension, protecting internal signal wires. The document warns: "Cable damage will let water enter and destroy the entire system."
The winch limits the probe’s lowering/retrieval speed to ≤3m/min. This slow, steady movement prevents cable tangling avoiding probe damage or image distortion and ensures the CCD sensor captures clear, non-blurred frames.
