Problems of linear birefringence in optical glass current transformers with return-back optical paths

2006 ◽  
Author(s):  
Zhengping Wang ◽  
Xiaoyu Liu ◽  
Zongjun Huang
Keyword(s):  
Optical Glass ◽  
Linear Birefringence ◽  
Current Transformers ◽  
Glass Current ◽  
Optical Paths

Novel approach to measure the linear birefringence in bulk optical glass sensing head of current sensors

2002 ◽  
Author(s):  
Zheng Ping Wang ◽  
Qingbo Li ◽  
Huili Wang ◽  
Ruiying Feng ◽  
Zongjun Huang ◽  
...  
Keyword(s):  
Optical Glass ◽  
Linear Birefringence ◽  
Novel Approach ◽  
Current Sensors

Theoretical analysis of effects of linear birefringence inside sensing head upon bulk glass current sensors" performance

2005 ◽  
Author(s):  
Zheng Ping Wang ◽  
Qing Bo Li ◽  
Xiao Yu Liu ◽  
Feng Wang ◽  
Zong Jun Huang ◽  
...  
Keyword(s):  
Theoretical Analysis ◽  
Linear Birefringence ◽  
Bulk Glass ◽  
Glass Current ◽  
Current Sensors

Method for measuring linear birefringence inside bulk glass current-sensing elements

2004 ◽  
Vol 15 (10) ◽  
pp. 2062-2066 ◽  
Author(s):  
Zheng Ping Wang ◽  
Qing Bo Li ◽  
Chun Mei Ouyang ◽  
Zong Jun Huang ◽  
Jin Hui Shi
Keyword(s):  
Linear Birefringence ◽  
Bulk Glass ◽  
Current Sensing ◽  
Glass Current

Measurement of the linear birefringence inside bulk glass current sensing elements with a retarder

2005 ◽  
Author(s):  
Zheng Ping Wang ◽  
Qing Bo Li ◽  
Chun Mei Ouyang ◽  
Zong Jun Huang ◽  
Jin Hui Shi
Keyword(s):  
Linear Birefringence ◽  
Bulk Glass ◽  
Current Sensing ◽  
Glass Current

Inter-Method Reliability of Pulse Volume Related Measures Derived Using Finger-Photoplethysmography

2018 ◽  
Vol 32 (4) ◽  
pp. 182-190 ◽  
Author(s):  
Kenta Matsumura ◽  
Koichi Shimizu ◽  
Peter Rolfe ◽  
Masanori Kakimoto ◽  
Takehiro Yamakoshi
Keyword(s):  
Light Intensity ◽  
Adverse Effects ◽  
Light Source ◽  
Direct Current ◽  
Resting State ◽  
Current Component ◽  
Psychophysiological Measures ◽  
Pulse Volume ◽  
Optical Paths ◽  
Sensor Positions

Abstract. Pulse volume (PV) and its related measures, such as modified normalized pulse volume (mNPV), direct-current component (DC), and pulse rate (PR), derived from the finger-photoplethysmogram (FPPG), are useful psychophysiological measures. Although considerable uncertainties exist in finger-photoplethysmography, little is known about the extent of the adverse effects on the measures. In this study, we therefore examined the inter-method reliability of each index across sensor positions and light intensities, which are major disturbance factors of FPPG. From the tips of the index fingers of 12 participants in a resting state, three simultaneous FPPGs having overlapping optical paths were recorded, with their light intensity being changed in three steps. The analysis revealed that the minimum values of three coefficients of Cronbach’s α for ln PV, ln mNPV, ln DC, and PR across positions were .948, .850, .922, and 1.000, respectively, and that those across intensities were .774, .985, .485, and .998, respectively. These findings suggest that ln mNPV and PR can be used for psychophysiological studies irrespective of minor differences in sensor attachment positions and light source intensity, whereas and ln DC can also be used for such studies but under the condition of light intensity being fixed.

Sign in / Sign up

Export Citation Format

Share Document