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- W2003228571 abstract "Laser's optical output power and frequency are modulated when the optical beam is back-scattered into the active cavity of the laser. By signal processing, the Doppler frequency can be acquired, and the target's velocity can be calculated. Based on these properties, an interferometry velocity sensor can be designed. When target move in time-varying velocity mode, it is difficult to extract the target's velocity. Time-varying velocity measurement by self-mixing laser diode is explored. A mathematics model was proposed for the time-varying velocity (invariable acceleration) measurement by self-mixing laser diode. Based on this model, a Discrete Chirp-Fourier Transform (DCFT) method was applied, DCFT is analogous to DFT. We show that when the signal length N is prime, the magnitudes of all the side lobes are 1, whereas the magnitudes of the main lobe is , And the coordinates of the main lobe shows the target's velocity and acceleration information. The simulation results prove the validity of the algorithm even in the situation of low SNR when N is prime." @default.
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- W2003228571 date "2011-02-01" @default.
- W2003228571 modified "2023-09-26" @default.
- W2003228571 title "Study on time-varying velocity measurement with self-mixing laser diode based on Discrete Chirp-Fourier Transform" @default.
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- W2003228571 doi "https://doi.org/10.1088/1742-6596/276/1/012155" @default.
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