Ms. Lingman Ni Profile

Lingman Ni

at Tianjin Univ

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Publications (2)

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Proceedings Article | 8 July 2022 Paper

Dual-comb velocity measurement

Jihui Zheng, Fumin Zhang, Lingman Ni, Xinghua Qu

Proceedings Volume 12282, 122820S (2022) https://doi.org/10.1117/12.2613446

KEYWORDS: Velocity measurements, Signal detection, Distance measurement, Velocimetry, Laser applications

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Laser measurement systems occupy an important role in many application fields, such as autonomous driving, robotics, precision manufacturing, and basic science. The appearance of the optical frequency comb provides a new solution for measurement and has gradually become a hot topic of research. This paper proposes a speed measurement scheme based on dual optical frequency combs (OFCs) to realize dynamic speed monitoring for moving objects. The dual-comb scheme has the advantages of high speed, high resolution and high precision. It can not only use the periodic pulse in time domain to realize large scale and high accuracy measurement, but also the interference spectrum in frequency domain can obtain interference information. The experiment uses two OFCs with a small repetition rate difference, one is the signal laser and the other as the local oscillation (LO) laser. The cavity length of the two OFCs is continuously adjusted to control the repetition rate difference of the two OFCs at 2 kHz. And use the frequency counter to monitor the repetition rate of the two OFCs during the measurement, and compensate the drift of the OFC in real time. Set the measurement target on the high-speed guide rail, control the guide rail to move at different speeds, and measure the movement speed of the object in real time, which can accurately measure the speed of objects.

Proceedings Article | 19 November 2021 Paper

Simulation of key parameters of dual soliton microcombs ranging system with high repetition rate

Jihui Zheng, Fumin Zhang, Xinghua Qu, Lingman Ni

Proceedings Volume 12059, 1205914 (2021) https://doi.org/10.1117/12.2612038

KEYWORDS: Ranging, Solitons, Distance measurement, Pulsed laser operation, Frequency combs, Numerical simulations

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The asynchronous optical sampling (ASOPS) ranging method using dual optical frequency combs (OFCs) has high measurement accuracy and fast measurement speed, is has been widely used in precision manufacturing, aerospace and scientific research. In recent years, with the development of photonic integration technology, the on-chip soliton microcomb technology has gradually matured. Microcomb has the advantages of small size, high repetition rate, great integration, and system stability, providing an ideal light source for ranging. This paper simulates on the key parameters of dual soliton microcombs ranging system with high repetition rate. The ranging model and numerical simulation method based on soliton microcomb are proposed, the effects of different repetition rate and repetition rate different on ranging accuracy are compared. The optimal parameters of soliton microcomb are obtained.

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