Design of an Indigenised Electronic Lock-In Amplifier

[摘要] An indigenised lock-in amplifier is designed that enables the accurate measurement ofsignals contaminated by broad-band noise, power-line pick-up, frequency drift, or othersources of interference. It does this by means of an extremely narrow band detectorwhich has the centre of its passband locked to the frequency of the signal to be measured.Large improvements in signal-to-noise ratio are achieved.

[学科分类] 电子、光学、磁材料