Simple differential lock-in amplifier for optical measurements
- 1 September 1982
- journal article
- Published by AIP Publishing in Review of Scientific Instruments
- Vol. 53 (9) , 1388-1391
- https://doi.org/10.1063/1.1137172
Abstract
A lock-in amplifier for chopped optical signals is described. It is simple but effective. Its special features are: (a) The system reduces the effect on the experimental results of fluctuations in the light source intensity. (b) The locking in can be carried out with a chopper operating with a variable frequency. (c) A series of odd harmonics synchronous with the chopper can be chosen to be highly rejected. In particular, a signal due to pickup of the 3rd harmonics can be made small.Keywords
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