In this paper,we propose and experimentally demonstrate a method to realize a polarization detector by using a commercially available polymethyl methacrylate（PMMA） pipe.An asymmetric polarization-related structure i...In this paper,we propose and experimentally demonstrate a method to realize a polarization detector by using a commercially available polymethyl methacrylate（PMMA） pipe.An asymmetric polarization-related structure is fabricated by etching different grating structures on the external surface of the pipe.The results show that when the pipe rotates up to 90°,the peak of the transmission spectrum can evidently shift towards the low frequency,which means the pipe with grating structures can serve as a polarization detector.This design possesses the merits of a simple structure and easy fabrication.展开更多
The effect of the vertical pipe length on the performance of a coal pipe splitter with a perpendicularly arranged upstream elbow was investigated experimentally employing a fiber optic measuring system. The upstream e...The effect of the vertical pipe length on the performance of a coal pipe splitter with a perpendicularly arranged upstream elbow was investigated experimentally employing a fiber optic measuring system. The upstream elbow and coal pipe splitter were installed in two perpendicular planes. Contours of dis- tributions of the particle concentration and size were obtained in different transverse sections. The experimental data show that the maximum/minimum concentration ratio in transverse sections A, B, and C decreased rapidly as the length of the vertical pipe increased. The left/right-leg average concentration ratio remained about 1, and a balanced split was thus achieved. With a perpendicularly arranged upstream elbow, the vertical pipe length had little effect on the splitter performance, which is beneficial for engineering design and convenient for industrial application.展开更多
文摘In this paper,we propose and experimentally demonstrate a method to realize a polarization detector by using a commercially available polymethyl methacrylate（PMMA） pipe.An asymmetric polarization-related structure is fabricated by etching different grating structures on the external surface of the pipe.The results show that when the pipe rotates up to 90°,the peak of the transmission spectrum can evidently shift towards the low frequency,which means the pipe with grating structures can serve as a polarization detector.This design possesses the merits of a simple structure and easy fabrication.
基金This work was supported by National Natural Science Foundation of China （51476137） and the National Basic Research Program of China （2015CB251501 ）.
文摘The effect of the vertical pipe length on the performance of a coal pipe splitter with a perpendicularly arranged upstream elbow was investigated experimentally employing a fiber optic measuring system. The upstream elbow and coal pipe splitter were installed in two perpendicular planes. Contours of dis- tributions of the particle concentration and size were obtained in different transverse sections. The experimental data show that the maximum/minimum concentration ratio in transverse sections A, B, and C decreased rapidly as the length of the vertical pipe increased. The left/right-leg average concentration ratio remained about 1, and a balanced split was thus achieved. With a perpendicularly arranged upstream elbow, the vertical pipe length had little effect on the splitter performance, which is beneficial for engineering design and convenient for industrial application.
