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|Type:||Artigo de evento|
|Title:||Low Cost Data Acquisition Module For Evaluating The Quantitative Performance Of Daylight Systems|
|Abstract:||The search for efficient, auto-sustainable constructions allowing the user to be in contact with the outer environment, has stimulated the development of advanced strategies, in various devices, for the exploitation of the daylight. A low cost data acquisition system was developed for this study, to observe the distribution of the natural light inside a prototype and to evaluate the quantitative performance for redirecting systems. The circuit connects to a standard parallel port of any Personal Computer, and supplies 64 analog inputs, one for each luminous sensor. The luminous sensor is a resistor (Light Dependent Resistor) that responds to the illuminance with a reduction in the resistance when illuminated, it was chosen due to the spectral similarity to the human eye. As part of the circuit, a voltage divider translates the change in resistance, due to incident light into a change of voltage. After that, calibration curves are setup to relate the output voltage measured as a function of illuminance. The system is controlled through a computer using an acquisition software written in C language. It therefore provides a continuous investigation of the illuminance with a 12-bit resolution and a conversion time under 10μs.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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