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What is used as a light source in ear oximeter?(a) Mercury-vapor lamp(b) Sodium-vapor lamp(c) Tungsten-iodine lamp(d) Sulfur lampThis question was addressed to me in an international level competition.This interesting question is from Digital Stethoscope topic in chapter Biomedical Recorders of Biomedical Instrumentation

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Right choice is (c) Tungsten-iodine lamp

Easy explanation: The light source is a tungsten-iodine lamp that has a high output in the SPECTRUM of interest. A lens system collimates the light beam and DIRECTS it through thin-film interference filters that PROVIDE WAVELENGTH selection.



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