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A novel laser altimetry method with a long-range detection and high spatial resolution is proposed. The proposed method is based on random code phase modulation and heterodyne detection. The application of random code removes the pulselength restriction. Coarse and accurate measurements are combined in the signal process. In the proof-of-concept experiment, the range resolution and range accuracy...
A laser range finder used the technique of heterodyne detection and pseudorandom phase modulation is proposed. The detail principle of the detection system is presented. Simulation results show that 34.6 dB signal to noise ratio can be achieved under the laser transmit power of 0.1W, pulse length of 82us, telescope aperture of 0.1m, local oscillator power of 1mW, target distance of 100m. And the system...
High power laser has been used widely in industrial and surgical fields for its many advantages. However, the characteristics of the laser beam may evolve when it is transmitted from the laser exit to the application position through a medium, especially through optical fibers. The evolution of polarization and beam quality of the laser beam in large core fiber are investigated theoretically and experimentally...
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