Transcription of Phase sensitive detection: the lock-in amplifier
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Phase sensitive detection: the lock-in amplifier
Phase sensitive detection: the lock-in amplifier by Dr. G. Bradley Armen Department of Physics and Astronomy 401 Nielsen Physics Building The University of Tennessee Knoxville, Tennessee 37996-1200. Copyright April 2008 by George Bradley Armen*. *All rights are reserved. No part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage or retrieval system, without permission in writing from the author.
The lock-in amplifier operates on a very simple scheme: Consider a sinusoidal input signal V(t) =V0 sin(ωt +φ) . Suppose we also have available a reference signal VR (t) =sin(Ωt). The product of these two gives beats at the sum and difference …
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