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Short-range optical limited displacement resolution in laser heterodyne detection system
Yan, C. H.; T. F. Wang; H. Y. Zhang; T. Lu and S. S. Wu
2017
Source PublicationActa Physica Sinica
Volume66Issue:23
AbstractPhotocurrent power spectral density function of laser heterodyne detection is obtained by the statistical theory and Wiener-Khinchin theorem. For a short-range distance heterodyne system without considering atmospheric turbulence, we observe the relations between the photocurrent spectral line distribution and the laser linewidth, the intermediatefrequency signal, and the propagation delay time of signal light relative to local oscillator light. Theoretical formula of photocurrent power spectrum in relevant papers is revised to eliminate the effect of laser linewidth. Onedimensional probability distribution model of phase noise caused by laser linewidth is built based on the signal and noise theory. Accordingly we establish a mathematical model of limit detection accuracy based on laser wavelength, detection distance, and laser linewidth, which indicates the minimum detectable amplitude of heterodyne system. According to the numerical results, we find that the distribution of photocurrent spectral line intensities is greatly dependent on the relation between delay time and coherent time. And the minimum resolvable displacement increases with the detection distance and laser linewidth increasing. When the optical limited displacement resolution is 0.266 nm with a laser wavelength of 532 nm, a laser linewidth is 1 kHz, and a detection distance is 100 m. Experimental data in relevant papers agree well with the theoretical derivations. Our findings show that the research of displacement resolution might provide a quantitative reference for the theoretical research and engineering application of short-range heterodyne resolution.
Indexed Bysci ; ei
Language中文
Document Type期刊论文
Identifierhttp://ir.ciomp.ac.cn/handle/181722/59364
Collection中科院长春光机所知识产出
Recommended Citation
GB/T 7714
Yan, C. H.,T. F. Wang,H. Y. Zhang,et al. Short-range optical limited displacement resolution in laser heterodyne detection system[J]. Acta Physica Sinica,2017,66(23).
APA Yan, C. H.,T. F. Wang,H. Y. Zhang,&T. Lu and S. S. Wu.(2017).Short-range optical limited displacement resolution in laser heterodyne detection system.Acta Physica Sinica,66(23).
MLA Yan, C. H.,et al."Short-range optical limited displacement resolution in laser heterodyne detection system".Acta Physica Sinica 66.23(2017).
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