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Sensors 2006, 6(5), 514-525; doi:10.3390/s6050514

Light Dependent Resistance as a Sensor in Spectroscopy Setups Using Pulsed Light and Compared with Electret Microphones

1 Instituto de Pesquisa e Desenvolvimento (IP&D), Universidade do Vale do Paraíba, Av. Shishima Hifumi 2911, CEP 12244-000, São José dos Campos, SP, Brasil 2 entro Brasileiro de Pesquisas Físicas, R. Dr. Xavier Sigaud 150, CEP 22290-180, Rio de Janeiro, RJ, Brasil
* Author to whom correspondence should be addressed.
Received: 1 February 2006 / Revised: 27 April 2006 / Accepted: 9 May 2006 / Published: 9 May 2006
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Light-dependent resistances (LDR) are cheap light sensors. A less known lightdetector is the electret microphone, whose electret membrane functions as a perfectabsorber, but only detects pulsed light. The aim of this study was to analyze the use of aLDR and an electret microphone as a light sensor in an optical spectroscopy system usingpulsed light. A photoacoustic spectroscopy setup was used, substituting the photoacousticchamber by the light sensor proposed. The absorption spectra of two different liquids wereanalyzed. The results obtained allow the recommendation of the LDR as the first choice inthe construction of cheap homemade pulsed light spectroscopy systems.
Keywords: LDR; electret microphone; photoacoustic; pulsed light. LDR; electret microphone; photoacoustic; pulsed light.
This is an open access article distributed under the Creative Commons Attribution License (CC BY) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Da Silva, D.F.; Acosta-Avalos, D. Light Dependent Resistance as a Sensor in Spectroscopy Setups Using Pulsed Light and Compared with Electret Microphones. Sensors 2006, 6, 514-525.

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