Ultrasensitive all-fiber inline Fabry–Perot strain sensors for aerodynamic measurements in hypersonic flows. (July 2020)

• Record Type: Journal Article
• Authors: Xie, Zhendong; He, Xiu; Xiao, Yaqin; Yang, Tingting; Wang, Bin; Ran, Zengling; Rao, Yunjiang; Min, Fu; Qiu, Huacheng; Yang, Yanguang; Chu, Wangwei; Zeng, Debiao
• Is Part Of: ISA transactions. Volume 102(2020)
• Page Start: 388
• Page End: 396
• Publication Date: 2020-07
• Subjects: Aerodynamic measurement -- All-fiber Fabry–Perot strain sensors -- Fiber balance -- Wind tunnel; Engineering instruments -- Periodicals; Engineering instruments; Periodicals; Electronic journals; 629.805
• DOI: 10.1016/j.isatra.2020.02.020
• Languages: English
• ISSNs: 0019-0578

Abstract

Abstract: This work proposes an ultrasensitive, temperature-insensitive, all-fiber inline Fabry–Perot (FP) strain sensor for aerodynamic coefficients measurements of a hypervelocity ballistic correlation model 2 in a Φ 1 hypersonic wind tunnel. The FP sensors fabricated using 157 nm laser micromachining system are structurally simple, small-sized, and high-temperature resistance. 16 FP sensors are installed on a six-force balance, which is mounted inside the model, to sense the aerodynamic forces and moments of the model, and then the model's aerodynamic coefficients are calculated based on aerodynamic theory according to the test data. A new temperature-compensated method is proposed to improve measurement accuracy of aerodynamic coefficients via eliminating temperature-induced measurement errors. Experimental results show, at high temperatures, the FP sensors based on the balance (FP balance) exhibits a high-repeatability precision of the aerodynamic coefficients measurement of less than 1%, and match well with the results of the traditional method using foil-resistive strain sensors. This enhanced-sensitivity FP sensor is currently the most promising alternative to foil-resistive strain sensors for aerodynamic tests among kinds of fiber-optic strain sensors to the best of our knowledge. The FP balance satisfies the requirements of practical application of aerodynamic characteristic tests, and opens up another test system of the field. Highlights: All-fiber FP strain sensor for aerodynamic tests in wind tunnel are proposed. A new temperature-compensated method is proposed to eliminated temperature effect. The sensor based on a balance shows a high static accuracy, a temperature stability. A high repeatability precision of aerodynamic tests at high temperatures is achieved. The FP sensor is the most promising alternative to FR sensors for aerodynamic tests.