Analysis of the Effects of Flicker on the Blood-Flow Variation in the Human Eye

Peretto, Lorenzo; Riva, C.E.; Rovati, Luigi; Salvatori, Giorgia; Tinarelli, Roberto

doi:10.1109/tim.2009.2016773

Cited by 13 publications

(7 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The influence of flicker on an observer, including flicker caused by voltage supplying a light source, is a complex process [15], [17]- [25]. It depends on individual features, observer's condition, environmental conditions, properties of light source, and voltage fluctuations [26]- [28]. To evaluate the flicker severity caused by voltage fluctuations, it is necessary to apply measurement techniques used in social sciences [22], [29].…”

Section: A Standard Evaluation Of Flicker Severity Caused By Voltagementioning

confidence: 99%

Flicker Vision of Selected Light Sources

Otomański

Wiczyński

Zając

2017

Measurement Science Review

View full text Add to dashboard Cite

The results of the laboratory research concerning a dependence of flicker vision on voltage fluctuations are presented in the paper. The research was realized on a designed measuring stand, which included an examined light source, a voltage generator with amplitude modulation supplying the light source and a positioning system of the observer with respect to the observed surface. In this research, the following light sources were used: one incandescent lamp and four LED luminaires by different producers. The research results formulate a conclusion concerning the description of the influence of voltage fluctuations on flicker viewing for selected light sources. The research results indicate that LED luminaires are less susceptible to voltage fluctuations than incandescent bulbs and that flicker vision strongly depends on the type of LED source.

show abstract

Section: A Standard Evaluation Of Flicker Severity Caused By Voltagementioning

confidence: 99%

Flicker Vision of Selected Light Sources

Otomański

Wiczyński

Zając

2017

Measurement Science Review

View full text Add to dashboard Cite

show abstract

“…There is a general belief that the LED must be always‐on for LiFi; however, LiFi can operate at as low as 60 lux, whereas, in general, at least 400 lux is required for reading in a room . Moreover, as the operating frequency in LiFi is above 1 MHz, the high flicking‐rate is not even detected by human eye . Besides, the existing light infrastructure would not be replaced entirely for LiFi deployment, only LiFi devices are to be coupled with the light sources…”

Section: Introductionmentioning

confidence: 99%

Leveraging light‐fidelity for internet of light: State‐of‐the‐art and research challenges

Mukherjee

Lloret

2018

Internet Technology Letters

View full text Add to dashboard Cite

In this article, we review state-of-the-art of Light-Fidelity (LiFi) technology. Afterward, we show how hybrid LiFi/WiFi system enhances the system throughput and user's quality-of-services in the heterogeneous networks. Finally, we highlight the ongoing research efforts and open challenges toward internet of light with large-scale LiFi deployment in future wireless networks. KEYWORDS HetNet, LiFi, VLC, WiFi/LiFi1 Recently, the VLC standardization initiatives are being taken as a part of IEEE 802.15.7. 2 What is LiFi?Light-Fidelity (LiFi)-the term was first coined by Harald Haas in 2011 3 -transmits the wireless data through the modulation of the visible light. Generally, LiFi uses LEDs for transmission with intensity modulation (IM) and the signal is detected by using the principle of direct detection with a photodiode. LiFi extends the concept of VLC for highly secure, bi-directional, and fully networked wireless communication systems. Unlike point-to-point communications in VLC, LiFi provides multipoint communications with light emitting diodes (LEDs) as access points (APs) in the networks. 4,5 In addition, user mobility and multiuser access are supported by LiFi with attocells 6,7 in the network.

show abstract

“…Light flickering at a frequency of 8-10 Hz results in synchronization of alpha1 and alpha2 brain waves. The same frequency range increases the blood flow to the human eye, which is discussed in [3]. The study of the human eye's response to light flicker, based on a highly developed simulation model is discussed in [1].…”

Section: Introductionmentioning

confidence: 99%

Investigation of HID-lamp light emission differences for different power supply methods

Tomczuk

Mazurek

Hemka

et al. 2016

Bulletin of the Polish Academy of Sciences Technical Sciences

View full text Add to dashboard Cite

Abstract. This paper presents investigation of methods for reducing light pulsation and plasma temperature inside a high intensity discharge (HID) lamp arc tube. Differences found in light emission of an arc tube plasma channel under different power supply methods are presented and discussed in this work. The novelty of the paper lies in systematical investigation of different power converter supply methods and demonstrating that it has a significant influence on plasma temperature in an arc tube. The tested lamp was powered by electronic ballasts controlled by different algorithms, which forced their current waveform. To compare the results, the authors performed measurements on a discharge lamp powered by a standard electromagnetic ballast. The investigation of plasma parameters is based on the optical spectroscopy method. It was shown that by using the appropriate current shape of a high switching frequency supply converter, the plasma temperature of an HID lamp can be reduced almost by half.Key words: plasma temperature, electronic ballast, electromagnetic ballast, lamp current, light flux, light pulsation, high intensity discharge lamp.Investigation of HID-lamp light emission differences for different power supply methods Therefore, authors decided to perform a research determining the aforementioned parameters of an HID lamp. Plasma theoryPlasma is a source of optical radiation. One of the methods used to examine this state of matter is optical spectroscopy. The spectrum of plasma radiation carries a lot of information about atoms or ions, such as the type of gases used in discharge lamps, and the conditions in which they are located. All the processes taking place in radial plasma can be interpreted as a transition between two different quantum energy states. Processes involving the radiation of electrons and atoms (or ions) occur when an electron moves in an electrical field from one charged particle to another, usually an ion. As a result of its interaction with this particle, part of the path of the electron is curved. The temperature inside the arc tube of a discharge lamp is the parameter that determines the appropriate spectral distribution of the energy emitted by the plasma discharge, and the corresponding luminous efficiency. In the radiation spectrum of an HID lamp, there are a number of lines, characteristic of excited atoms. The shape of the spectral line reveals the conditions (pressure and temperature) prevailing in the discharge lamp. Fig. 1 shows a view of luminous plasma in a cold arc tube, whereas Fig. 2 shows luminous plasma in a hot arc tube.

show abstract

Analysis of the Effects of Flicker on the Blood-Flow Variation in the Human Eye

Cited by 13 publications

References 13 publications

Flicker Vision of Selected Light Sources

Flicker Vision of Selected Light Sources

Leveraging light‐fidelity for internet of light: State‐of‐the‐art and research challenges

Investigation of HID-lamp light emission differences for different power supply methods

Contact Info

Product

Resources

About