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浏览/检索结果: 共3条，第1-3条 帮助 已选(0)清除 条数/页：5101520253035404550556065707580859095100   排序方式：请选择作者升序作者降序题名升序题名降序发表日期升序发表日期降序提交时间升序提交时间降序 Modulated optical signal detection based on cross-correlation algorithm 会议论文 Beijing, China, 2021-06-20 作者:  Zeng, Ke;  Han, Junfeng;  Wang, Haitao;  Wang, Chen;  Xie, Xiaoping 收藏  |  浏览/下载：24/0  |  提交时间：2022/01/30 Space laser communication  Modulated optical signal  Cross-correlation algorithm  Extremely low SNR   Investigation of role of the discharge tube in pulse modulated surface-wave argon plasma column at atmospheric pressure by optical emission spectroscopy 期刊论文 PHYSICS OF PLASMAS, 2019, 卷号: 26 作者:  Chen, Chuan-Jie;  Li, Shou-Zhe;  Wu, Yue;  Zhang, Jialiang 收藏  |  浏览/下载：10/0  |  提交时间：2019/12/02 Argon  Atmospheric pressure  Carrier concentration  Electric discharges  Electron density measurement  Electron wave tubes  Light emission  Optical emission spectroscopy  Optical signal processing  Plasma diagnostics  Surface waves, Argon plasmas  Axial profiles  Collision frequency  Emission intensity  Gas temperature  Pulse modulated  Stark broadenings  Theoretical modeling, Gas discharge tubes   New phase measurement method for laser rangefinder (EI CONFERENCE) 会议论文 5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment, April 26, 2010 - April 29, 2010, Dalian, China Sun W.-J.; Sun J.-N.; Bu W.-B.; Meng Z. 收藏  |  浏览/下载：20/0  |  提交时间：2013/03/25 A new phase measurement method is designed and presented by using the technique of signal shifting phase and the technique of signal multiplication for laser rangefinder. The intensity of laser light is modulated by cosine circuit signal  at the same time the cosine circuit signal is thansformed sine signal by the shifting phase technique. Two signals mentioned above are multiplied by received signal from the target respectively  then being transmitted into signal processor after passing through low band filter respectively. The result of phase-shift between the received signal and sent signal is calculated by means of signal processor and time-counter with double frequency of modulation signal. The proposed system is composed of four units such as control and count unit  emitting and receiving unit of laser light  signal processing unit and result display unit. The two most advantages of proposed system over others are its ability of proper isolation which reduces crosstalk and its independency thermal drift. Theoretical calculations and experimental results have shown the accuracy better than 2 mm. 2010 Copyright SPIE - The International Society for Optical Engineering.