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Measurement of lighting at eyes level with a wearable device

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Author(s):
Maíra Vieira Dias
Total Authors: 1
Document type: Master's Dissertation
Institution: Universidade Estadual de Campinas, Faculdade de Engenharia Civil, Arquitetura e Urbanismo
Defense date:
Advisor: Paulo Sergio Scarazzato
Abstract

The performance of employees is directly related with health and environmental factors associated to workplace, as example lighting. The lighting conditions interfere on satisfaction with work and influence both visual and non-visual functions in human being. High illuminance at eyes level can increase visual activities, alertness and well-being, since within certain limits. The existing sensing technologies to evaluate the indoor lighting conditions from a fixed point of view and measure the luminous quantities such as horizontal and vertical illuminance do not necessarily reflect the actual light received by the building occupants. In this way, a Brazilian device named "OcuLux" derived from the German one "LuxBlick" was developed. The device has a RGB sensor attached to the glass frame and the form of wearable glasses provide continuously the actual pupilar illuminance (lux). To investigate the light flux that reaches the user's eyes during the working hours the sensor was calibrated at the Solar Energy and Building Physics Laboratory (LESO-PB) of the École Polytechnique Fédérale de Lausanne (EPFL) in Lausanne (Switzerland). After that, experimental studies were performed in the LESO-PB from October 2016 to January 2017 spanning different sky conditions to diagnose the light dose received by the office occupant. We also investigate the most suitable configuration for the HDR vision sensor device used by that institution and that performs dynamic luminance mapping and provides an estimate of the pupilar illuminance. Results showed the differences between the light dose received during the morning and in the afternoon, as well as the influence of day length and sky condition. These influences could also be verified in each of the settings established for the HDR vision sensor. The use of the "OcuLux" with the HDR vision sensor indicated that the first device is appropriate for studies that correlate the impact of lighting on visual comfort and made it possible to validate the Brazilian wearable device. The research allowed a better understanding between lighting characteristics, the built environment and the user (AU)

FAPESP's process: 12/08887-1 - Lighting in Industrial Environment and its Influence on Employee's Visual Field
Grantee:Maíra Vieira Dias
Support type: Scholarships in Brazil - Doctorate