Carrier-suppressed modulation and self-mixing demodulation for vibration measurement.
We present a double-sideband suppressed-carrier (DSB-SC) technique achieved by an optical balanced detection approach for measuring small vibrations. The baseband signal is recovered by demodulating the DSB-SC signal with a self-mixing approach without local oscillator, which is usually required in coherent detection. The achievement of carrier suppression and vibration measurement is experimentally demonstrated, and the result closely agrees with the theoretical predictions.
Department of Computer and Communication Engineering, Nan Kai University of Technology, Nantou, Taiwan.
Kuo-Chen
KC
Lang
Hung-Jin
HJ
Teng
Hui-Kang
HK
Teng