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. A. Introduction Phase - sensitive detection is a powerful method for seeing very small signals in the presence of overwhelming noise. Developed in the 1960's, it's become a ubiquitous experimental technique, and the lock-in amplifier1 is the instrument which makes this method possible. In this laboratory we'll learn about the method in some generality, and apply it to measure some very small quantities which would be impossible by conventional means. The laboratory consists (like life) of three stages: First we'll look at a synthetic signal in the presence of some well behaved noise'.
A lock-in, or phase-sensitive, amplifier is simply a fancy AC voltmeter. Along with the input, one supplies it with a periodic reference signal. The amplifier then responds only to the portion of the input signal that occurs at the reference frequency with a fixed phase relationship. By designing experiments that exploit this feature, it’s
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