Smartphones as a Light Measurement Tool: Case of Study

Gutierrez-Martinez, Jose-Maria; Castillo-Martinez, Ana; Merodio, José Amelio Medina; Aguado-Delgado, Juan; Martínez-Herráiz, José-Javier

doi:10.3390/app7060616

Cited by 32 publications

(22 citation statements)

References 25 publications

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“…Sound levels and illuminance were measured on both experimental days with a Huawei P9 Lite smartphone (Huawei, China) using the "Sound Meter" and "Light Meter" applications, both of which have been shown to be excellent applications comparable to a professional laboratory sound analyzing instrument [19,20], and using a professional illuminance analyzing instrument. The mean sound level (±SD) measured with the "Sound Meter" application in the indoor environment was 47.86 ± 10.24 dB, whereas the mean sound level in the forest environment was 38.08 ± 5.19 dB.…”

Section: Study Sitesmentioning

confidence: 99%

The Effects of a Short Forest Recreation Program on Physiological and Psychological Relaxation in Young Polish Adults

Bielinis

Krupińska-Szeluga

et al. 2019

Forests

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Forest recreation is an activity that could be successfully used to alleviate negative symptoms of stress in individuals. Multiple positive psychological and physiological effects have been described in the literature, especially regarding works describing research from Asian countries such as Japan, Korea, and Taiwan. In East-Central Europe, however, the effectuality of forest recreation has not been addressed in scientific research. Thus, a special recreation program was developed, and its usability was examined with the involvement of 21 young Polish adults. A pre- and post-test design was used, wherein four psychological questionnaires were applied (Profile of Mood States, Positive and Negative Affect Schedule, Restorative Outcomes Scale, Subjective Vitality Scale), and physiological measures were assessed (pulse rate, blood pressure) before and after the program. A field study was also conducted at the nature reserve Redykajny, near the suburban forest of the city of Olsztyn. The recreational program had a significant impact on psychological and physiological parameters. After recreation, the negative mood markers of the negative affect decreased and the positive affect, including restoration and vitality, increased. Furthermore, pulse rates, systolic blood pressures, and mean arterial pressures of the participants were significantly lower after the program. These results reveal that the short forest recreation program may be effective in reducing negative symptoms of stress.

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Section: Study Sitesmentioning

confidence: 99%

The Effects of a Short Forest Recreation Program on Physiological and Psychological Relaxation in Young Polish Adults

Bielinis

Krupińska-Szeluga

et al. 2019

Forests

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“…The smartphone was moved in all directions, 360 degrees, describing an imaginary sphere during five seconds at 1 m height to obtain the mean value of lux, with an error of one lux. Given that the measurements obtained with Lux Meter app were not compared with values obtained with real lux meter indicator equipment, the lux values can be biased and therefore must be used as a guiding reference of luminance levels [26].…”

Section: Methodsmentioning

confidence: 99%

Artificial Light at Night (ALAN) Is the Main Driver of Nocturnal Feral Pigeon (Columba livia f. domestica) Foraging in Urban Areas

Leveau

2020

Animals

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Artificial light at night (ALAN) is one of the most extreme environmental alterations in urban areas, which drives nocturnal activity in diurnal species. Feral Pigeon (Columba livia f. domestica), a common species in urban centers worldwide, has been observed foraging at night in urban areas. However, the role of ALAN in the nocturnal activity of this species is unknown. Moreover, studies addressing the relationship between ALAN and nocturnal activity of diurnal birds are scarce in the Southern Hemisphere. The objective of this study is to assess the environmental factors associated with nocturnal activity of the Feral Pigeon in Argentinian cities. Environmental conditions were compared between sites where pigeons were seen foraging and randomly selected sites where pigeons were not recorded foraging. Nocturnal foraging by the Feral Pigeon was recorded in three of four surveyed cities. ALAN was positively related to nocturnal foraging activity in Salta and Buenos Aires. The results obtained suggest that urbanization would promote nocturnal activity in Feral Pigeons. Moreover, nocturnal activity was mainly driven by ALAN, which probably alters the circadian rhythm of pigeons.

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“…The left column shows the light flow for the sunny scene, the right for the rainy scene Figure 13 Measurement devices. Left to right: cubic meter based on the Konica Minolta system, 32,53 luxmeter and smartphone with Luxi with a white diffusion cap (Luxi) and the corresponding app (see measurements evaluation study by Gutierrez-Martinez et al 57 ). We used the Luxi for cubic measurements in the same manner as the luxmeter.…”

Section: Volumetric Light Measurementsmentioning

confidence: 99%

A toolbox for volumetric visualization of light properties

Kartashova

Ridder

Pas

et al. 2019

Lighting Research & Technology

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In this paper, we introduce a toolbox for the perceptually based visualization of light in a volume, focusing on the visual effects of illumination. First, our visualizations extend the conventional methods from a two-dimensional representation on surfaces to the whole volume of a scene. Second, we extend the conventional methods from showing only light intensity to visualizing three light properties (mean illuminance, primary direction and diffuseness). To make our methods generally available and easily accessible, we provide a web-based tool, to which everybody can upload data, measured by a cubic or simple illuminance meter or even a smartphone-app, and generate a variety of three-dimensional visualizations of the light field. The importance of considering the light field in its full complexity (and thus as a three-dimensional vector field instead of its two-dimensional sections) is widely acknowledged. Our toolbox allows easy access to sophisticated methods for analysing the spatial distribution of light and its primary qualities as well as how they vary throughout space. It is our hope that our results raise interest in ‘third stage’ approaches to lighting research and design, and the toolbox offers a practical solution to this complex problem.

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Smartphones as a Light Measurement Tool: Case of Study

Cited by 32 publications

References 25 publications

The Effects of a Short Forest Recreation Program on Physiological and Psychological Relaxation in Young Polish Adults

The Effects of a Short Forest Recreation Program on Physiological and Psychological Relaxation in Young Polish Adults

Artificial Light at Night (ALAN) Is the Main Driver of Nocturnal Feral Pigeon (Columba livia f. domestica) Foraging in Urban Areas

A toolbox for volumetric visualization of light properties

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