Huang Hui, Dalian University of Technology professor team invented a "temperature coefficient adjustable high sensitivity optical fiber strain sensor." Compared with the existing fiber grating strain sensor, the sensitivity is improved by more than one hundred times, especially the thermal expansion of various measured objects can be compensated, the measurement error caused by the change of ambient temperature can be eliminated, and the problem long plagued the industry is solved.
As one of the core devices of the Internet of Things, the sensor is considered as another major industry after the integrated circuit chip. Compared with electrical sensors, optical fiber sensors for flammable, as well as electromagnetic interference and other harsh environments. However, due to the thermal expansion and contraction nature of materials, making the temperature interference more complex. Failure to accurately measure the strain and stress caused by external forces is a longstanding problem for the industry.
Huang Hui team invented the optical fiber strain sensor, the strain film, fiber collimator, and the transmission rod. Among them, the transmission lever adopts a knob structure composed of two kinds of nuts and screws with different thermal expansion coefficients, so that the thermal expansion coefficient of the transmission rod can be accurately adjusted in a wide range, thereby counteracting the thermal expansion effect of various measured objects. In addition, by using a fiber collimator to receive the light reflected by the strain film, the detection sensitivity is greatly improved. The developed optical fiber sensor has a detection range of 1.1 × 103με, a detection limit of 5.7 × 10ˉ3με, a maximum operating frequency of 1.18 KHz and a temperature coefficient adjustment range of 0.15 ~ +0.19 dB / ° C.
It is understood that this achievement team of Professor Huang Hui to "a kind of high sensitivity optical fiber strain sensor with adjustable temperature coefficient - for temperature compensation test" as a topic, published in the Chinese Academy of Sciences, the National Natural Science Foundation of China magazine On Science Bulletin.
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