Mr. Haoyang Yu Profile

Haoyang Yu

at Tsinghua Univ Shenzhen International Graduate School

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Proceedings Article | 19 November 2019 Paper

Angular velocity measurement system based on optical frequency comb

Ruyu Ma, Haoyang Yu, Kai Ni, Qian Zhou, Xinghui Li, Guanhao Wu

Proceedings Volume 11182, 1118210 (2019) https://doi.org/10.1117/12.2537826

KEYWORDS: Frequency combs, Light sources, Sagnac interferometers, Interferometry, Fiber optic gyroscopes, Aerospace engineering

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The optical frequency comb (OFC) is an emerging laser light source, which has laid the foundation for high resolution, high sensitivity, wide bandwidth and fast measurement. Angular velocity measurement as an important direction in the field of measurement has been paid attention. Nowadays, fibre optic gyroscope (FOG) is usually used to measure angular velocity. The Sagnac effect is the theoretical basis of FOG. Therefore, it is especially important to verify whether the FOG has Sagnac effect. Through theoretical derivation, when the FOG is used as a light source in combination with Sagnac interferometer and the Sagnac interferometer rotates at different angular velocities, the trigonometric function reflects the mutual transformation of the intensity of the light emitted by the interferometer and angular velocities, and the corresponds nonlinear relationship. This proves that FOG has Sagnac effect. When repetition frequency of FOG is locked ,this system can be used to measure angular velocity. In the experiment, we use 1km single-mode fiber as the rotating part of Sagnac interferometer, and measure the light intensity value at 20 different angular velocities. Measuring 10 times at each angular velocity for the mean value, which are used to fit the trigonometric function curve. The results show that the correlation coefficient of the fitting curve is greater than 0.99, and standard deviations of the measurement points are less than 0.06V. The corresponding angle error values at different angular velocities are converted into the distance errors, which are less than 0.032um.

Proceedings Article | 25 October 2018 Paper

A simulation method for dual-comb spectroscopy with jitter noise

Haoyang Yu, Kai Ni, Qian Zhou, Xinghui Li, Guanhao Wu

Proceedings Volume 10822, 108220Q (2018) https://doi.org/10.1117/12.2500976

KEYWORDS: Signal to noise ratio, Spectroscopy, Distortion, Frequency combs, Control systems, Computer simulations, Interferometers, Fourier transforms, Visible radiation, Ultrafast phenomena

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Dual-comb spectroscopy is an emerging spectral detection technology with high resolution, high sensitivity, broad bandwidth and fast detection speed. By using a pair of coherent optical frequency combs, asynchronous light sampling is realized and pico-scale theoretical resolution can be achieved without mechanical scanning components. However, coherence between dual combs suffers from the frequency jitter, which causes distortion of spectral information. Furthermore, since jitter noise components in the experiment are complex, widely sourced, and difficult to control. It is impractical to study the effects of a specific jitter noise and observe how jitter correction algorithm works through an actual dual-comb spectroscopy experimental system. To solve this problem, a simulation method is proposed for dualcomb spectroscopy with jitter noise to verify the effectiveness of data processing algorithm. Two Gaussian random jitter sequence with a standard deviation of 0.16fs are generated as time jitter for dual-comb spectroscopy simulation system. The simulation results show that the time jitter causes the calculated spectral center wavelength δν to have a random jitter of standard deviation of ~40GHz. The time-domain averaging method and the frequency-domain averaging method are applied to the data obtained from the simulation system. Through 100 time-domain averaging, there is no visible compensation effect on the deviation of calculated spectral center wavelength, and the SNR becomes worse as the average number increases. On the contrary, 100 frequency-domain averaging reduces the standard deviation of the spectral center wavelength deviation to ~2.6GHz and can obtain 10 times the SNR of 100 time-domain averaging.

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