Dr. Fu Yang Profile

Dr. Fu Yang

at Donghua Univ

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Publications (2)

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Proceedings Article | 13 December 2024 Paper

Research on echo signal processing in the marine particulate organic carbon detection system

Zixian Wang, Jianhua Shang, Fu Yang, Yan He

Proceedings Volume 13496, 134960G (2024) https://doi.org/10.1117/12.3046282

KEYWORDS: Signal detection, Signal processing, Ocean optics, Pulse signals, Photon counting, Photodetectors, Analog electronics, Optical signal processing, Optical circuits, Device simulation

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The ocean plays an important role in the global carbon cycle. Carbon is transmitted along the food chain in the form of particulate organic carbon (POC), starting from the photosynthesis of phytoplankton. Therefore, detecting the content of POC in the ocean plays a significant role in estimating the carbon sink capacity of the ocean. With the help of LIDAR detection systems, the profile concentration information of POC in seawater can be detected based on the optical property changes caused by phytoplankton. In order to satisfy the detection requirements of a LIDAR system, a detection capability with sensitivity up to the single photon level, dynamic range of 50dB, and response bandwidth of 180MHz, the echo optical signal detection and processing system is designed combining the analog detection and photon counting detection. By means of theoretical analysis, simulation analysis and experimental analysis, the analog detection channel output signal meets the following ADC acquisition requirements, and the photon counting channel can accurately discriminate the input pulse signal accurately. This echo optical signal detection and processing system is capable of providing a signal bandwidth of 180MHz and a fixed time delay without distortion, oscillation or pulse width broadening.

Proceedings Article | 18 June 2021 Paper

Simulation research of ocean lidar system based on the single photon detection array

Fu Yang, Yanyu Lu, Tangjiali Chen, Yan He, Bingyi Liu

Proceedings Volume 11850, 118500R (2021) https://doi.org/10.1117/12.2599561

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The detection of ocean profile optical parameters is of great significance to ocean science. The existing ocean passive remote sensing systems mainly focus on the detection of surface parameters. If we want to obtain the ocean profile parameters in a big area, active remote sensing technology is necessary to adopted. The difficulty of ocean active remote sensing detection system lies in the strong reflection of the sea surface, and rapid attenuation of the laser energy under the surface. Therefore, the dynamic range of the signal can reach nearly five orders of magnitude. It’s a great challenge for the performance of the detection system that undertakes the role of photo-electric conversion. Only by fully simulating the performance of the detection system can we obtain the corresponding relationship between the returned optical signal and the output electrical signal, and ensure the reliability of the subsequent signal processing. In this paper, Hamamatsu multipixel Photon Counter is selected as the detector, and the return photo profile data is provided by Ocean University of China. The photoelectric conversion process is simulated both in digital and analog mode. Meanwhile, the influences of background light, after pulse, accumulation times, laser wavelength and detection area are also simulated and analyzed. The simulation results are in good agreement with the trend of the theoretical curve. The simulation system provides a basis for accurately evaluating the photoelectric conversion process of Ocean Lidar, and guarantees the authenticity of the subsequent signal processing system.

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