Demonstration of a Filterless, Multi-Point, and Temperature-Independent Fiber Bragg Grating Dynamical Demodulator Using Pulse-Width Modulation

Sensors

RivaelS. Penze¹  FábioR. Bassan¹  MarcioC. Argentato¹  Arturde A. Silva¹  Claudio Floridia¹  JoaoB. Rosolem¹  MarceloA. Ramos Junior²  Deleon Vasconcelos² 

[1]CPQD Research and Development Center in Telecommunications, Campinas, SP 13086-902, Brazil

[2]Centrais Elétricas da Paraíba, João Pessoa, PB 58.000-000, Brazil

关键词: FBG;    PWM;    engine;    high temperature;    ECU;    FBG demodulator;   

DOI  :  10.3390/s20205825

来源: DOAJ

【 摘 要 】

We demonstrated in this work a filterless, multi-point and temperature-independent FBG (fiber Bragg grating) dynamical demodulator using pulse-width-modulation (PWM). In this approach, the FBG interrogation system is composed of a tunable laser and a demodulator that is designed to detect the wavelength shift of the FBG sensor without any optical filter making it very suitable to be used in harsh environments. In this work, we applied the proposed method that uses the PWM technique for FBG sensors placed in high pressure and high-temperature environments. The proposed method was characterized in the laboratory using an FBG sensor modulated in a frequency of 6 Hz, with a 1 kHz sweeping frequency in the wavelength range from 1527 to 1534 nm. Also, the method was evaluated in a field test in an engine of a thermoelectric power plant.

【 授权许可】

Unknown