Department of Biomedical Engineering and Biotechnology, University of Massachusetts Lowell, 1 University Ave., MA, Lowell, 01854, USA.
Department of Electrical and Computer Engineering, University of Massachusetts Lowell, 1 University Ave, Lowell, MA 01854, USA.
Sensors (Basel). 2019 Jan 19;19(2):404. doi: 10.3390/s19020404.
This paper presents the design, fabrication, and characterization of a novel fiber optic ultrasonic sensing system based on the photoacoustic (PA) ultrasound generation principle and Fabry-Perot interferometer principle for high temperature monitoring applications. The velocity of a sound wave traveling in a medium is proportional to the medium's temperature. The fiber optic ultrasonic sensing system was applied to measure the change of the velocity of sound. A fiber optic ultrasonic generator and a Fabry-Perot fiber sensor were used as the signal generator and receiver, respectively. A carbon black-polydimethylsiloxane (PDMS) material was utilized as the photoacoustic material for the fiber optic ultrasonic generator. Two tests were performed. The system verification test proves the ultrasound sensing capability. The high temperature test validates the high temperature measurement capability. The sensing system survived 700 °C. It successfully detects the ultrasonic signal and got the temperature measurements. The test results agreed with the reference sensor data. Two potential industry applications of fiber optic ultrasonic sensing system are, it could serve as an acoustic pyrometer for temperature field monitoring in an industrial combustion facility, and it could be used for exhaust gas temperature monitoring for a turbine engine.
本文提出了一种基于光声（PA）超声产生原理和 Fabry-Perot 干涉仪原理的新型光纤超声传感系统的设计、制造和特性，用于高温监测应用。在介质中传播的声波的速度与介质的温度成正比。光纤超声传感系统用于测量声速的变化。光纤超声发生器和 Fabry-Perot 光纤传感器分别用作信号发生器和接收器。炭黑-聚二甲基硅氧烷（PDMS）材料被用作光纤超声发生器的光声材料。进行了两项测试。系统验证测试证明了超声传感能力。高温测试验证了高温测量能力。传感系统在 700°C 下幸存下来。它成功地检测到超声波信号并获得了温度测量结果。测试结果与参考传感器数据一致。光纤超声传感系统的两个潜在工业应用是，它可以用作工业燃烧设备中温度场监测的声学高温计，也可以用于涡轮发动机的废气温度监测。
