Thermally regenerated low-reflectivity fiber Bragg gratings（RFBGs）, as one mirror of a resonant cavity, have been introduced as linear-cavity fiber lasers combining with fiber saturable absorbers. The output of lasi...Thermally regenerated low-reflectivity fiber Bragg gratings（RFBGs）, as one mirror of a resonant cavity, have been introduced as linear-cavity fiber lasers combining with fiber saturable absorbers. The output of lasing presents an optical signal-to-noise ratio of 50 dB and temperature sensitivity coefficient of 15.36 pm∕℃ for the heating process and 15.46 pm∕℃ for the cooling process. The lasing wavelength variation and power fluctuation at 700℃ are less than 0.02 nm and 0.21 dB, respectively. The RFBG-based fiber laser sensing has displayed good linearity for both the temperature rising and cooling processes, and favorable stability at high temperatures.展开更多
In this paper, the spectrum shift properties of the center reflection wavelength detected to be based on the FBG sensor with ambient temperature change. The basic theoretical methods and numerical simulation for the s...In this paper, the spectrum shift properties of the center reflection wavelength detected to be based on the FBG sensor with ambient temperature change. The basic theoretical methods and numerical simulation for the spectral properties of uniform Bragg grating is analyzed by using coupling mode theory which is optical properties of high sensitivity fiber Bragg grating on temperature sensor in accordance with experiment.展开更多
The moire interferometry method was used with holographic gratings for high temperature and high speed photography to measure the dynamic deformation of LY12 aluminum plate with a central hole under tensile loading co...The moire interferometry method was used with holographic gratings for high temperature and high speed photography to measure the dynamic deformation of LY12 aluminum plate with a central hole under tensile loading condition and heated by a strong current. Transient fullfield fringe patterns were acquired during the heating process. Transient temperature of the specimen was simultaneously recorded by a temperature measurement system. The experimental results show that dynamic moire fringe patterns can be measured during high heating rate conditions using high speed photography.展开更多
基金supported by the Beijing Outstanding Talent Training Funded Project(No.2015000020124G074)the 111 Project(No.D17021)the Changjiang Scholars and Innovative Research Team in University(No.IRT_16R07)
文摘Thermally regenerated low-reflectivity fiber Bragg gratings（RFBGs）, as one mirror of a resonant cavity, have been introduced as linear-cavity fiber lasers combining with fiber saturable absorbers. The output of lasing presents an optical signal-to-noise ratio of 50 dB and temperature sensitivity coefficient of 15.36 pm∕℃ for the heating process and 15.46 pm∕℃ for the cooling process. The lasing wavelength variation and power fluctuation at 700℃ are less than 0.02 nm and 0.21 dB, respectively. The RFBG-based fiber laser sensing has displayed good linearity for both the temperature rising and cooling processes, and favorable stability at high temperatures.
基金Supported by Beijing Educational Committee Foundation (Km200310005022) and (00KG040)
文摘In this paper, the spectrum shift properties of the center reflection wavelength detected to be based on the FBG sensor with ambient temperature change. The basic theoretical methods and numerical simulation for the spectral properties of uniform Bragg grating is analyzed by using coupling mode theory which is optical properties of high sensitivity fiber Bragg grating on temperature sensor in accordance with experiment.
文摘The moire interferometry method was used with holographic gratings for high temperature and high speed photography to measure the dynamic deformation of LY12 aluminum plate with a central hole under tensile loading condition and heated by a strong current. Transient fullfield fringe patterns were acquired during the heating process. Transient temperature of the specimen was simultaneously recorded by a temperature measurement system. The experimental results show that dynamic moire fringe patterns can be measured during high heating rate conditions using high speed photography.
