Flux modulation scheme for direct current SQUID readout revisited

2016 ◽  
Vol 108 (6) ◽  
pp. 062601 ◽  
Author(s):  
Tao Hong ◽  
Hai Wang ◽  
Yi Zhang ◽  
Hans-Joachim Krause ◽  
Alex I. Braginski ◽  
...  
Keyword(s):  
Direct Current ◽  
Modulation Scheme ◽  
Flux Modulation ◽  
Squid Readout

Comparison of Noise Performance of the dc SQUID Bootstrap Circuit With That of the Standard Flux Modulation dc SQUID Readout Scheme

2011 ◽  
Vol 21 (3) ◽  
pp. 501-504 ◽  
Author(s):  
Yi Zhang ◽  
Guofeng Zhang ◽  
Huiwu Wang ◽  
Yongliang Wang ◽  
Hui Dong ◽  
...  
Keyword(s):  
Noise Performance ◽  
Flux Modulation ◽  
Readout Scheme ◽  
Squid Readout

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.

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