Mr. Yang Cheng Profile

Yang Cheng

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Proceedings Article | 19 October 2016 Paper

Application of drive circuit based on L298N in direct current motor speed control system

Liuliu Yin, Fang Wang, Sen Han, Yuchen Li, Hao Sun, Qingjie Lu, Cheng Yang, Quanzhao Wang

Proceedings Volume 10153, 101530N (2016) https://doi.org/10.1117/12.2246555

KEYWORDS: Control systems, Interferometers

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In the experiment of researching the nanometer laser interferometer, our design of laser interferometer circuit system is up to the wireless communication technique of the 802.15.4 IEEE standard, and we use the RF TI provided by Basic to receive the data on speed control system software. The system’s hardware is connected with control module and the DC motor. However, in the experiment, we found that single chip microcomputer control module is very difficult to drive the DC motor directly. The reason is that the DC motor's starting and braking current is larger than the causing current of the single chip microcomputer control module. In order to solve this problem, we add a driving module that control board can transmit PWM wave signal through I/O port to drive the DC motor, the driving circuit board can come true the function of the DC motor’s positive and reversal rotation and speed adjustment. In many various driving module, the L298N module’s integrated level is higher compared with other driver module. The L298N model is easy to control, it not only can control the DC motor, but also achieve motor speed control by modulating PWM wave that the control panel output. It also has the over-current protection function, when the motor lock, the L298N model can protect circuit and motor. So we use the driver module based on L298N to drive the DC motor. It is concluded that the L298N driver circuit module plays a very important role in the process of driving the DC motor in the DC motor speed control system.

Proceedings Article | 8 October 2015 Paper

Measurement of super large radius optics in the detection of gravitational waves

Cheng Yang, Sen Han, Quanying Wu, Binming Liang, Changlun Hou

Proceedings Volume 9677, 967727 (2015) https://doi.org/10.1117/12.2202738

KEYWORDS: Error analysis, Mirrors, Optical testing, Interferometers, Imaging systems, Precision measurement, Edge detection, Fizeau interferometers, Calibration, Physics

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The existence of Gravitational Wave (GW) is one of the greatest predictions of Einstein’s relative theory. It has played an important part in the radiation theory, black hole theory, space explore and so on. The GW detection has been an important aspect of modern physics. With the research proceeding further, there are still a lot of challenges existing in the interferometer which is the key instrument in GW detection especially the measurement of the super large radius optics. To solve this problem, one solution , Fizeau interference, for measuring the super large radius has been presented. We change the tradition that curved surface must be measured with a standard curved surface. We use a flat mirror as a reference flat and it can lower both the cost and the test requirement a lot. We select a concave mirror with the radius of 1600mm as a sample. After the precision measurement and analysis, the experimental results show that the relative error of radius is better than 3%, and it can fully meet the requirements of the measurement of super large radius optics. When calculating each pixel with standard cylinder, the edges are not sharp because of diffraction or some other reasons, we detect the edge and calculate the diameter of the cylinder automatically, and it can improve the precision a lot. In general, this method is simple, fast, non-traumatic, and highly precision, it can also provide us a new though in the measurement of super large radius optics.

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