@article{oai:miyazaki-u.repo.nii.ac.jp:00002419,
 author = {田坂, 英紀 and Tasaka, Hidenori and 安達, 祐二 and Adachi, Yuji},
 journal = {宮崎大学工学部紀要, Memoirs of Faculty of Engineering, University of Miyazaki},
 month = {Aug},
 note = {Abstract 
In an internal combustion engine, promotion of combustion is one of the factors to achieve low fuel 
consumption, low exhaust pollution and high thermal efficiency. Promotion of combustion is related to 
in-cylinder gas flow. There is laser doppler velocimetry (LDV) in one of equipment to measure 
in-cylinder gas flow. We changed light source from gas laser of large size to laser diode (LD) of small 
size for miniaturization to improve in flexibility. LD light has an extension angle different in vertical and 
horizontal direction, therefore beam section becomes elliptic section. There is possibility that beam 
power cannot be fully used by this cause. Then, in this research, we studied about the way of collimation 
to use beam power efficiently. As a result, we found the way of collimation to reduce beam diameter and 
increase beam strength. But, this way caused decline of S/N due to increase of noise. Then, when we 
measured with frequency shifter, we were not possible to measure in-cylinder gas flow, and more 
examination should be required.},
 pages = {197--203},
 title = {LD-LDVの光源光学系の改善},
 volume = {34},
 year = {2005},
 yomi = {タサカ, ヒデノリ and アダチ, ユウジ}
}