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Abstract

The presented work is a experimental method for estimation and detection of low frequency signals. An efficient receiver is implemented using balanced homodyne detection. The setup is successful in determining the moving mirror frequencies with minimum noise. Here the local oscillator frequency is the frequency which is applied to the mirror. The beam of two different frequencies is imposed on photo detector circuits, which are subtracted and output signal is observed on oscilloscope. The difference amplifier used should have high CMRR and    input impedance.

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