Electroencephalogram signal detection with smart phone applications

Huang, Wei-Hsin; Yang, Cheng-Hsiung; Hsu, Terng-Ren; Fan, Ching-Chih

doi:10.1109/icce-berlin.2015.7391334

Cited by 2 publications

(2 citation statements)

References 3 publications

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“…The diamond samples (type Ib), enriched with nitrogen, were grown using a temperature-gradient, high temperature, high pressure (TG-HPHT) growth process [32,33] at a pressure of 5 GPa and a temperature of 1500-1550 °C. Pure (99.9995%) graphite was used as a carbon source for growth.…”

Section: Methodsmentioning

confidence: 99%

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The Study of the Efficiency of Nitrogen to Nitrogen‐Vacancy (NV)‐Center Conversion in High‐Nitrogen Content Samples

Bolshedvorskii

Тарелкин

Soshenko

et al. 2023

Physica Rapid Research Ltrs

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The nitrogen‐vacancy color center in diamond is one of the important systems in the fast‐growing field of sensing. This color center is used in both high‐resolution and high‐sensitivity sensors. However, techniques for the quick and efficient formation of NV centers are still in the development stage. Herein, a study on the influence of the electron irradiation dose on the conversion of substitutional nitrogen into NV− centers is presented. The study is done on diamonds that are highly enriched with nitrogen (≈100 ppm), which, on one hand, should maximize the effect of irradiation, and, on other hand, be of interest for high‐sensitivity magnetometers. The maximum achieved conversion efficiency is as high as 37% ± 3.7%, with no observed saturation on the electron dose even with the simplest annealing procedure. The measurements of the corresponding dephasing time made it possible to make a theoretical estimate for the shot‐noise‐limited magnetic field sensitivity per unit volume of diamond to be roughly ≈ 1 × 10 − 13 T false[ Hz ⋅ mm − 3 false] − 1 .

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Section: Methodsmentioning

confidence: 99%

“…[37] Concentrations of the NV À centers formed after annealing were measured using the visible absorption spectrum (see Figure 1b), taken at 77 K using the method described in references. [32,33] The concentration of NV centers was calculated using the following formula n NV½ppm ¼ 0.332I 637…”

Section: Methodsmentioning

confidence: 99%