Mr. Jinyu Lu Profile

Jinyu Lu

at Henan Institute of Meteorological Science

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Publications (2)

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Proceedings Article | 18 November 2019 Paper

Realization of high-intensity focusing ultrasound pressure and detection of sound field

Jie Zhao, Weimin Zhu, Jinyu Lu, Tao Liu, Dayong Wang

Proceedings Volume 11189, 111891Q (2019) https://doi.org/10.1117/12.2537803

KEYWORDS: Ultrasonography, Thin films, Particles, Ultrasonics, Demodulation, Transducers, Positron emission tomography, Calibration, Spherical lenses, Acoustics

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In the ultrasound field, the parameters of the therapeutic sound field can’t trace to the source, or be directly measured. In order to solve this problem, this paper builds a system to obtain high-intensity focusing ultrasound pressure and detect sound field. High-intensity ultrasound pressure is detected directly by laser scanning technology. This technology overcomes the disadvantages of needlelike or thin-film hydrophone, whose tolerance is low, invasive detection influences the ultrasound field, and limited size brings the amendment average effect. Firstly, the general principle to measure the ultrasound pressure is proposed. The optical interference method is adopted to put a thin film coated with gold into the ultrasound field. When the thickness of the thin film is much smaller than the wavelength of the ultrasound, the vibration velocity of the thin film can be obtained by laser vibrometer, then the sound pressure of the same position can be calculated accordingly. Secondly, the configuration of the system is clearly shown, including the hardware and software. The system can realize scanning the ultrasound field, and obtain the characteristics parameters. Finally, the achieved target is introduced. The range of frequency is from 0.5 MHz to 60 MHz with 10 MPa@1 MHz peak-to-peak sound pressure value. The scanning configuration has the spatial accuracy better than 0.02 mm, and X/Y/Z scope larger than 400 mm. The above parameters mainly meet the requirement of the therapeutic sound field.

Proceedings Article | 18 November 2019 Paper

Study of vehicle exhaust detection based on TDLAS

Kexin Zhang, Weimin Zhu, Jie Zhao, Jinyu Lu, Tao Liu

Proceedings Volume 11189, 111891H (2019) https://doi.org/10.1117/12.2537568

KEYWORDS: Absorption, Carbon monoxide, Modulation, Sensors, Semiconductor lasers, Signal detection, Gases, Infrared radiation, Absorption spectroscopy, Detection and tracking algorithms

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Tunable Diode Laser Absorption Spectroscopy (TDLAS) applies optical method to realize fast and non-contact detection. This technology has the advantages of high resolution and high sensibility, and been widely employed in atmosphere environment detection in recent years. This paper mainly introduces how TDLAS is applied to detect the vehicle exhaust, to determine the content of CO, CO₂, NO and alkanes etc. Firstly, the principle of TDLAS is Lambert-Beer's law. It is based on the specific spectral "fingerprint" characteristics of different gases to detect the gas composition. In the same time, the light intensity is attenuated by molecular absorption, which is used to accurately analyze the density of gas. There are two ways to achieve. One is direct-absorption way, whose configuration and signal processing are simple, results have no need to be demarcated. The other is wavelength-modulation way, which has high resolution and low threshold. The selection of absorption spectral line needs not only to adapt the central wavelength of laser and responding wavelength of detector, but also to avoid the crossed spectral line of different gas to improve the precision of detection. Secondly, TDLAS system includes three parts, which are signal generation, signal detection and signal processing. Finally, TDLAS is compared with other spectral detection technologies in the aspect of sensitivity, character of working, applicable kinds of gas, in order to highlight the application scope of each technology.

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