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    { "id" : "http://dbpedia.org/resource/Lock-in_amplifier"
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        "http://www.w3.org/2000/01/rdf-schema#comment" : [ "A lock-in amplifier is a type of amplifier that can extract a signal with a known carrier wave from an extremely noisy environment. Depending on the dynamic reserve of the instrument, signals up to 1 million times smaller than noise components, potentially fairly close by in frequency, can still be reliably detected. It is essentially a homodyne detector followed by low pass filter that is often adjustable in cut off frequency and filter order." ] ,
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