Measurement of the thermal expansion of space structures using fiber Bragg grating sensors and displacement measuring interferometers
Measurement of the thermal expansion of space structures using fiber Bragg grating sensors and displacement measuring interferometers
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DOI：
10.1088/0957-0233/21/8/085704
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发表时间：
2010-08-01
影响因子：
2.4
通讯作者：
Han, Jae-Hung
中科院分区：
文献类型：
--
作者：
Kim, Hong-Il;Yoon, Jae-San;Han, Jae-Hung
研制了一套热变形测量系统，该系统由用于应变测量的光纤布拉格光栅（FBG）传感器和用于精确获取试样膨胀数据的位移测量干涉仪（WST）系统组成，并安装在真空室中，在真空室中可以控制试样的温度以模拟空间环境。该系统由两个外差干涉仪、一个激光头、电子设备和一个由熔融石英制成的热稳定样品底座组成，用于验证FBG传感器测量的样品的热膨胀。我们在20摄氏度至40摄氏度的真空条件下，使用FBG传感器和TTE系统测量了因瓦合金试样（称为热稳定材料）的平均热膨胀系数（CTE）。基于FBG和FBG测量，Invar试样的CTE结果分别为1.226 x 10（-6）K-1和1.298 x 10（-6）K-1。结果表明，利用光纤光栅传感器可以精确测量空间环境中试件或结构的热变形。
A thermal deformation measurement system, composed of fiber Bragg grating (FBG) sensors for strain measurement and a displacement measuring interferometer (DMI) system for accurate specimen expansion data acquisition, was prepared and installed in a vacuum chamber where the temperature of the test specimen can be controlled to simulate space environments. The DMI system, which consists of two heterodyne interferometers, a laser head, electronics and a thermally stable specimen base made of fused silica, was used to validate the thermal expansions of the specimens measured by the FBG sensors. We measured the average coefficient of thermal expansion (CTE) of an Invar specimen, known as a thermally stable material, using both the FBG sensors and the DMI system in vacuum conditions from 20 degrees C to 40 degrees C. The CTE results of the Invar specimen were found to be 1.226 x 10(-6) K-1 and 1.298 x 10(-6) K-1 based on the FBG and DMI measurements, respectively. The present results show that it is possible to precisely measure the thermal deformation of a specimen or structure in space environments using FBG sensors.