Ms. Ran Wang Profile

Ran Wang

at System Engineering Research Institute

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Publications (4)

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Proceedings Article | 5 November 2020 Paper

Research progress of ship IRST system

Ran Wang, Debao Yan, Zixuan Fang, Guoqing Wang, Qi Zhao

Proceedings Volume 11567, 115674D (2020) https://doi.org/10.1117/12.2580366

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Infrared Search and Track – IRST system as a passive panoramic surveillance device based on infrared features can detect and track air or surface targets. It has many advantages, such as high resolution, strong resistance to electronic interference, good concealment, and strong anti-stealth and so on. Because IRST system and the radar can be complemented by multi-sensor data fusion technology. this paper summarizes the research progress and key technology breakthrough of IRST system in domestic and abroad. Then by analyzing the outstanding advantages of IRST technology for one hand the research direction and application prospect of this technology in industrial and military fields are put forward, for the other hand the conceptual design and engineering research of this technology are summarized and prospected.

Proceedings Article | 5 November 2020 Paper

Research progress of LIDAR system based on optical phased array technology

Ran Wang, Debao Yan, Jincheng Wang, Guoqing Wang, Qi Zhao

Proceedings Volume 11567, 115674A (2020) https://doi.org/10.1117/12.2580344

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Optical Phase Array - OPA is a fast, flexible and non-mechanical beam pointing technology, which can be regarded as the extension of microwave phased array to the Optical wave frequency band. It has a wide application prospect and research value in target detection, imaging recognition, tracking scanning, laser interference and other fields. Optical phased array system is composed of a number of array elements, the basic idea is through electric scanning technology and modular design method. The beam can be transmitted, received and detected with high precision by using multiple small aperture beam oriental arrays. Based on acoustic-optic and elector-optic devices, the propagation direction of the beam is changed by controlling the initial phase of each element in the optical aperture, thus completed the laser beam array scan. In this paper, the development background and working principle of optical phased array technology are introduced. Based on the typical application of optical phased array technology, that is, laser phased array radar system, this paper summarizes the research progress and key technology breakthrough of this system in domestic and abroad. Finally, by analyzing the outstanding advantages of optical phased array technology, for one hand the research direction and application prospect of this technology in industrial and military fields are put forward, for the other hand the conceptual design and engineering research of this technology are summarized and prospected.

Proceedings Article | 24 October 2017 Paper

Design of remote laser-induced fluorescence system's acquisition circuit

Guoqing Wang, Yue Lou, Ran Wang, Debao Yan, Xin Li, Xin Zhao, Dong Chen, Qi Zhao

Proceedings Volume 10461, 104610R (2017) https://doi.org/10.1117/12.2283552

KEYWORDS: Laser induced fluorescence, Laser development, Laser systems engineering

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Laser-induced fluorescence system(LIfS) has been found its significant application in identifying one kind of substance from another by its properties even it’s thimbleful, and becomes useful in plenty of fields. Many superior works have reported LIfS’ theoretical analysis , designs and uses. However, the usual LIPS is always constructed in labs to detect matter quite closely, for the system using low-power laser as excitation source and charge coupled device (CCD) as detector. Promoting the detectivity of LIfS is of much concern to spread its application. Here, we take a high-energy narrow-pulse laser instead of commonly used continuous wave laser to operate sample, thus we can get strong fluorescent. Besides, photomultiplier (PMT) with high sensitivity is adopted in our system to detect extremely weak fluorescence after a long flight time from the sample to the detector. Another advantage in our system, as the fluorescence collected into spectroscopy, multiple wavelengths of light can be converted to the corresponding electrical signals with the linear array multichannel PMT. Therefore, at the cost of high-powered incentive and high-sensitive detector, a remote LIFS is get. In order to run this system, it is of importance to turn light signal to digital signal which can be processed by computer. The pulse width of fluorescence is deeply associated with excitation laser, at the nanosecond(ns) level, which has a high demand for acquisition circuit. We design an acquisition circuit including, I/V conversion circuit, amplifying circuit and peak-holding circuit. The simulation of circuit shows that peak-holding circuit can be one effective approach to reducing difficulty of acquisition circuit.

Proceedings Article | 24 October 2017 Paper

Study of improving signal-noise ratio for fluorescence channel

Guoqing Wang, Xin Li, Yue Lou, Dong Chen, Xin Zhao, Ran Wang, Debao Yan, Qi Zhao

Proceedings Volume 10461, 104610M (2017) https://doi.org/10.1117/12.2283358

KEYWORDS: Luminescence, Laser induced fluorescence, Laser systems engineering

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Laser-induced fluorescence(LIFS), which is one of most effective discrimination methods to identify the material at the molecular level by inducing fluorescence spectrum, has been popularized for its fast and accurate probe’s results. According to the research, violet laser or ultraviolet laser is always used as excitation light source. While, There is no atmospheric window for violet laser and ultraviolet laser, causing laser attenuation along its propagation path. What’s worse, as the laser reaching sample, part of the light is reflected. That is, excitation laser really react on sample to produce fluorescence is very poor, leading to weak fluorescence mingled with the background light collected by LIFS’ processing unit, when it used outdoor. In order to spread LIFS to remote probing under the complex background, study of improving signal-noise ratio for fluorescence channel is a meaningful work. Enhancing the fluorescence intensity and inhibiting background light both can improve fluorescence’ signal-noise ratio. In this article, three different approaches of inhibiting background light are discussed to improve the signal-noise ratio of LIFS. The first method is increasing fluorescence excitation area in the proportion of LIFS’ collecting field by expanding laser beam, if the collecting filed is fixed. The second one is changing field angle base to accommodate laser divergence angle. The third one is setting a very narrow gating circuit to control acquisition circuit, which is shortly open only when fluorescence arriving. At some level, these methods all can reduce the background light. But after discussion, the third one is best with adding gating acquisition circuit to acquisition circuit instead of changing light path, which is effective and economic.

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