scholarly journals Low noise measurement method based on differential optical interferometer for cold atom experiments

2019 ◽  
Vol 28 (1) ◽  
pp. 175 ◽  
Author(s):  
Xiaoxiao Ma ◽  
Xian Zhang ◽  
Kaikai Huang ◽  
Xuanhui Lu
Keyword(s):  
Measurement Method ◽  
Cold Atom ◽  
Low Noise ◽  
Noise Measurement ◽  
Optical Interferometer

Comparison of Noise Reduction Performance Evaluation Methods for Low-Noise Pavement in Korea- Part

2021 ◽  
Vol 263 (4) ◽  
pp. 2930-2939
Author(s):  
Byungchae Kim ◽  
Hyunjin Kim ◽  
Wonuk Kang
Keyword(s):  
Noise Reduction ◽  
Noise Level ◽  
Measurement Method ◽  
Road Traffic ◽  
Low Noise ◽  
Management Standards ◽  
Close Proximity ◽  
Porous Pavement ◽  
Reduction Effect ◽  
Measurement Location

In Korea, road noise is assessed as a measurement method of exterior noise emitted by road vehicle for management standards by the National Institute of Environmental Sciences. In this method, the noise felt at the actual pickup point is measured as LAeq (the roadside equivalent noise level). Recently, to clarify the standard for measuring noise on low-noise pavements, the CPX (ISO11819-2; Close-proximity method) was first introduced in the Porous Pavement Guidelines of the Ministry of Land, Infrastructure and Transport. According to ISO, the CPX adopts the side microphone as a mandatory measurement location, and the rear optional. The side location has been a mandatory due to its high correlation with SPB (ISO 11819-1, Statistical Pass-by method). However, according to our previous study on the correlation evaluation between L and CPX rear microphone noise level, both noise reduction effect was about 9-12 dB(A) showed a high correlation in Korea where heavy road traffic is common. The following study aims to show the consistent correlation between the L and CPX rear noise level. Furthermore, it is intended to be helpful in selecting the location of the CPX microphone that can most effectively represent the actual noise on the low-noise pavement in Korea.

Michelson laser interferometer-based vibration noise contribution measurement method for cold atom interferometry gravimeter

2020 ◽  
Vol 29 (7) ◽  
pp. 070601
Author(s):  
Ning Zhang ◽  
Qingqing Hu ◽  
Qian Wang ◽  
Qingchen Ji ◽  
Weijing Zhao ◽  
...  
Keyword(s):  
Measurement Method ◽  
Laser Interferometer ◽  
Cold Atom ◽  
Atom Interferometry ◽  
Vibration Noise ◽  
Noise Contribution

scholarly journals On the Study of Aerodynamic Noise Measurement of Turbulent Flow Field with a Low-noise Turbulence Generator

2007 ◽  
Vol 73 (732) ◽  
pp. 1629-1636 ◽  
Author(s):  
Akiyoshi IIDA ◽  
Kenji MORITA ◽  
Hiroyuki TANIDA ◽  
Toshitaka MINBU ◽  
Akisato MIZUNO ◽  
...  
Keyword(s):  
Flow Field ◽  
Turbulent Flow ◽  
Low Noise ◽  
Noise Measurement ◽  
Aerodynamic Noise ◽  
Turbulent Flow Field ◽  
Turbulence Generator
Sign in / Sign up

Export Citation Format

Share Document