Dopant effect on transmission loss increase due to hydrogen permeation

1984 ◽  
Vol 20 (3) ◽  
pp. 115 ◽  
Author(s):  
M. Kuwazuru ◽  
K. Mochizuki ◽  
Y. Namihira ◽  
Y. Iwamoto
Keyword(s):  
Transmission Loss ◽  
Hydrogen Permeation ◽  
Dopant Effect

Transmission loss increase in optical fibres due to hydrogen permeation

1983 ◽  
Vol 19 (18) ◽  
pp. 743 ◽  
Author(s):  
K. Mochizuki ◽  
Y. Namihira ◽  
H. Yamamoto
Keyword(s):  
Transmission Loss ◽  
Hydrogen Permeation ◽  
Optical Fibres

Effect of leakage and blockage on the acoustic behavior of particle filters

2019 ◽  
Vol 67 (6) ◽  
pp. 483-492
Author(s):  
Seonghyeon Baek ◽  
Iljae Lee
Keyword(s):  
Transfer Matrix ◽  
Particle Filters ◽  
Acoustic Analysis ◽  
Transmission Loss ◽  
One Dimensional ◽  
Filter System ◽  
The Difference ◽  
The One ◽  
Analytical Approaches ◽  
Good Agreement

The effects of leakage and blockage on the acoustic performance of particle filters have been examined by using one-dimensional acoustic analysis and experimental methods. First, the transfer matrix of a filter system connected to inlet and outlet pipes with conical sections is measured using a two-load method. Then, the transfer matrix of a particle filter only is extracted from the experiments by applying inverse matrices of the conical sections. In the analytical approaches, the one-dimensional acoustic model for the leakage between the filter and the housing is developed. The predicted transmission loss shows a good agreement with the experimental results. Compared to the baseline, the leakage between the filter and housing increases transmission loss at a certain frequency and its harmonics. In addition, the transmission loss for the system with a partially blocked filter is measured. The blockage of the filter also increases the transmission loss at higher frequencies. For the simplicity of experiments to identify the leakage and blockage, the reflection coefficients at the inlet of the filter system have been measured using two different downstream conditions: open pipe and highly absorptive terminations. The experiments show that with highly absorptive terminations, it is easier to see the difference between the baseline and the defects.

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