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Open AccessArticle

The Effect of Light Source Line Width on the Spectrum Resolution of Dual-Frequency Coherent Detection Signals

1
Graduate School, Space Engineering University, Beijing 101416, China
2
Department of Electronic and Optical Engineering, Space Engineering University, Beijing 101416, China
*
Author to whom correspondence should be addressed.
Sensors 2019, 19(23), 5264; https://doi.org/10.3390/s19235264
Received: 14 October 2019 / Revised: 20 November 2019 / Accepted: 25 November 2019 / Published: 29 November 2019
(This article belongs to the Special Issue Laser-Spectroscopy Based Sensing Technologies)
In this paper, the power spectrum resolution problem of dual-frequency coherent mixing signals is analyzed when the Doppler frequency difference is small. The power spectrum function formula of the four optical coherent mixing signals is obtained using statistical theory and the Wiener–Khinchin theorem. The influence of delay time and light source line width on the power spectrum of dual-frequency coherent signals is analyzed using this formula. The results show that delay time only affects the peak of the power spectrum of the coherent signal. An increase in the line width of the light source broadens the signal power spectrum and reduces the peak value. The necessary condition for distinguishing the Doppler frequency difference is that the theoretical Doppler frequency difference is greater than 1/5 times the line width of the light source. View Full-Text
Keywords: dual-frequency coherence; line width; doppler shift; power spectrum; microwave beat frequency dual-frequency coherence; line width; doppler shift; power spectrum; microwave beat frequency
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MDPI and ACS Style

Ren, J.; Sun, H.; Zhang, L.; Zhao, Y. The Effect of Light Source Line Width on the Spectrum Resolution of Dual-Frequency Coherent Detection Signals. Sensors 2019, 19, 5264.

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