H. Nuroso, W. Kurniawan, P. Marwoto
A simple instrument used for measuring light beam transmittance percentage made of window film has been developed. The instrument uses a laser pointer of 405 nm and 650 nm ±10% as a light source. Its accuracy approaches 80%. Transmittance data was found by comparing the light beam before and after passing the window film. The light intensity measuring unit was deleted by splitting the light source into two beams through a beam splitter. The light beam was changed into resistance by a NORP12 LDR sensor designed at a circuit of voltage divider rule of Khirchoff's laws. This conversion system will produce light beam intensity received by the sensor to become an equal voltage. This voltage will, then, be presented on the computer screen in the form of a real time graph via a 2.0 USB data transfer.
Postgraduate Programs, Universitas Negeri Semarang, Kampus Unnes Bendan Ngisor Semarang, Central-Java, Indonesia; Physics Education Studies Programs, Universitas PGRI Semarang, 1 Lontar Street Semarang, Central-Java, Indonesia
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