Page - 1429 - in Book of Full Papers - Symposium Hydro Engineering

3.3. THE CONSTRUCTION OF OPTICAL FIBER ON SITE AND COLLECTION OF TEMPERATURE DATA On-site construction, the workers should embed the optical fiber at the exact location according to design drawings. During the process of the construction of the optical fiber, using the concrete vibrator makes the concrete flaccid. Then pressing the optical fiber vertically into the concrete with a depth of 10-15cm, and fixing it with a U-shaped bar (Fig.6). After completing the construction of the optical fiber, the workers should test the buried optical fiber with the DTS instrument to ensure that the optical fiber is integrity, has no breakpoint, and is good communication. After confirming that the fiber has survived, the data can be collected and analyzed (Fig.6). Fig.6 The construction of optical fiber on site and collection of temperature data 4. ANALYSIS OF DISTRIBUTED OPTICAL FIBER TEMPERATURE MEASUREMENT RESULTS 4.1. THE TEMPERATURE DATA CONTRAST BETWEEN OPTICAL FIBER AND CONCRETE THERMOMETER In order to test the accuracy and reliability of the temperature data by distributed optical fiber, the coincident location of the concrete thermometer and the optical fiber is recorded during the construction process. The temperature at the coincident location is used to compare the data with the two temperature measurement methods later. In 2017/7/25 and 2017/8/4, the temperature data of two different temperature measurement methods are compared (Fig.7 to 8). Optical fiber Data collector Data monitor 1429