Methods of Thermal Field Measurements
In the early days of geothermics, temperature measurements were made mainly in soil, underground water, mines, tunnels, draw-wells, shafts and caves. Temperature was measured with various air, water and alcohol thermometers with inaccurate scales. The measurements were often inaccurate and not compatible. Relatively precise graduated mercury and alcohol thermometers with conventional scales have only been used since the middle of the 18th century. Today, geophysical temperature devices can register temperature values with an accuracy of 0.001 °C and higher. This Chapter contains a scheme of different types of thermal observations in applied geophysics and their short description.
KeywordsUnderground Opening Thermal Measurement Backscatter Light Resistance Temperature Detector Distribute Temperature Sensor
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