scholarly journals Brillouin spectral deconvolution method for centimeter spatial resolution and high-accuracy strain measurement in Brillouin sensors

2005 ◽  
Vol 30 (7) ◽  
pp. 705 ◽  
Author(s):  
Shahraam Afshar V. ◽  
Xiaoyi Bao ◽  
Lufan Zou ◽  
Liang Chen
Keyword(s):  
Spatial Resolution ◽  
Strain Measurement ◽  
High Accuracy ◽  
Deconvolution Method ◽  
Spectral Deconvolution ◽  
Spectral Deconvolution Method

scholarly journals Using Spectral Methods to Obtain Particle Size Information from Optical Data: Applications to Measurements from CARES 2010

2017 ◽  
Author(s):  
Dean B. Atkinson ◽  
Mikhail Pekour ◽  
Duli Chand ◽  
James G. Radney ◽  
Katheryn R. Kolesar ◽  
...  
Keyword(s):  
Particle Size ◽  
Optical Property ◽  
Size Distribution ◽  
Effective Radius ◽  
Deconvolution Method ◽  
Spectral Deconvolution ◽  
Multi Wavelength ◽  
Fine Mode ◽  
Spectral Deconvolution Method

Abstract. Multi-wavelength aerosol extinction, absorption and scattering measurements made at two ground sites during the 2010 Carbonaceous Aerosols and Radiative Effects Study (CARES) are analyzed using a spectral deconvolution method that allows extraction of particle size-related information, including the fraction of extinction produced by the fine mode particles and the effective radius of the fine mode. The spectral deconvolution method is typically applied to analysis of remote sensing measurements. Application to in situ measurements allows for comparison with more direct measurement methods and validation of the retrieval approach. Here, the retrieved fine mode fraction and effective radius generally compare well with other in situ measurements, including size distribution measurements and scattering and absorption measurements made separately for PM1 and PM10, but some limitations are also identified. These results indicate that for campaigns where size, composition, and multi-wavelength optical property measurements are made, comparison of the results can result in closure or can identify unusual circumstances. The comparison here also demonstrates that in situ multi-wavelength optical property measurements can be used to determine information about particle size distributions in situations where direct size distribution measurements are not available

scholarly journals Using spectral methods to obtain particle size information from optical data: applications to measurements from CARES 2010

2018 ◽  
Vol 18 (8) ◽  
pp. 5499-5514 ◽  
Author(s):  
Dean B. Atkinson ◽  
Mikhail Pekour ◽  
Duli Chand ◽  
James G. Radney ◽  
Katheryn R. Kolesar ◽  
...  
Keyword(s):  
Particle Size ◽  
Optical Property ◽  
Size Distribution ◽  
Effective Radius ◽  
Deconvolution Method ◽  
Spectral Deconvolution ◽  
Multi Wavelength ◽  
Fine Mode ◽  
Spectral Deconvolution Method

Abstract. Multi-wavelength in situ aerosol extinction, absorption and scattering measurements made at two ground sites during the 2010 Carbonaceous Aerosols and Radiative Effects Study (CARES) are analyzed using a spectral deconvolution method that allows extraction of particle-size-related information, including the fraction of extinction produced by the fine-mode particles and the effective radius of the fine mode. The spectral deconvolution method is typically applied to analysis of remote sensing measurements. Here, its application to in situ measurements allows for comparison with more direct measurement methods and validation of the retrieval approach. Overall, the retrieved fine-mode fraction and effective radius compare well with other in situ measurements, including size distribution measurements and scattering and absorption measurements made separately for PM1 and PM10, although there were some periods during which the different methods yielded different results. One key contributor to differences between the results obtained is the alternative, spectrally based definitions of fine and coarse modes from the optical methods, relative to instruments that use a physically defined cut point. These results indicate that for campaigns where size, composition and multi-wavelength optical property measurements are made, comparison of the results can result in closure or can identify unusual circumstances. The comparison here also demonstrates that in situ multi-wavelength optical property measurements can be used to determine information about particle size distributions in situations where direct size distribution measurements are not available.

Improvement of Spatial Resolution for Strain Measurement with Brillouin Optical Time-Domain Reflectometer by Fitting Method Based on Equivalent Optical Pulse

2008 ◽  
Vol 28 (1) ◽  
pp. 43-49 ◽  
Author(s):  
王峰 Wang Feng ◽  
张旭苹 路元刚'南京大学光通信工程研究中心 Zhang Xuping ◽  
江苏 南京 Lu Yuangang ◽  
董玉明 Dong Yuming
Keyword(s):  
Spatial Resolution ◽  
Time Domain ◽  
Strain Measurement ◽  
Optical Pulse ◽  
Optical Time Domain Reflectometer ◽  
Fitting Method ◽  
Optical Time ◽  
Time Domain Reflectometer
Sign in / Sign up

Export Citation Format

Share Document