A programmable borehole measurement system was deployed in hot water drilled ice holes during the ‘Bed Access and Monitoring of Ice Sheet History’ (BEAMISH) project to drill to the bed of the Rutford Ice Stream in West Antarctica. This system operates autonomously (no live data) after deployment, and records borehole diameter (non-contact measurement), water column pressure, heading and inclination. Three cameras, two sideways looking and one vertical, are also included for visual inspection of hole integrity and sediments. The system is small, lightweight (~35.5 kg) and low power using only 6 ‘D’ cell sized lithium batteries, making it ideal for transport and use in remote field sites. The system is 2.81 m long and 165 mm in diameter, and can be deployed attached to the drill hose for measurements during drilling or on its own deployment line afterwards. The full system is discussed in detail, highlighting design strengths and weaknesses. Data from the BEAMISH project are also presented in the form of camera images showing hole integrity, and sensor data used to calculate borehole diameter through the full length of the hole. These data are used to show confidence in hole verticality and subsurface cavity development and connection.

中文翻译：

---

热水钻冰钻孔非接触式测量系统

在“冰盖历史访问和监测”(BEAMISH) 项目中，在热水钻孔冰孔中部署了可编程钻孔测量系统，以钻探南极洲西部拉特福德冰流的河床。该系统在部署后自主运行（无实时数据），并记录钻孔直径（非接触式测量）、水柱压力、航向和倾角。还包括三个摄像头，两个侧视和一个垂直，用于目视检查孔的完整性和沉积物。该系统体积小、重量轻（约 35.5 千克）且功耗低，仅使用 6 个“D”型锂电池，非常适合在偏远现场进行运输和使用。该系统长 2.81 m，直径 165 mm，并且可以在钻井期间或之后在其自己的部署线上部署连接到钻井软管进行测量。详细讨论了整个系统，突出了设计的优势和劣势。BEAMISH 项目的数据也以相机图像的形式呈现，显示孔的完整性，以及用于计算钻孔全长的钻孔直径的传感器数据。这些数据用于显示对孔垂直度和地下空腔发展和连接的信心。