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- 实验方案
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[IEEE 2019 IEEE 2nd International Conference on Electronics Technology (ICET) - Chengdu, China (2019.5.10-2019.5.13)] 2019 IEEE 2nd International Conference on Electronics Technology (ICET) - An X-Band Compact 3-dB Waveguide Coupler
摘要： This paper proposed an X-band compact 3-dB waveguide coupler with high power capacity and compact structure designed for a SLED pulse compression device and conducted the researches on structure design, theoretical analysis and numerical simulation. The structure of the 3-dB coupler is very simple, which is mainly constructed by two standard rectangular waveguides with a coupling hole connects them. The numerical simulation results show that the reflection coefficient S11 and the transmission coefficient S21 are both smaller than -47dB at the center frequency of 9.3GHz, which means low reflection and high isolation between Port 1 and Port 2. The transmission coefficients S31 and S41 are - 2.99dB and -3.01dB, respectively, which implies good 3-dB coupling characteristic of the device. And the phase difference of the output signals of these two 3-dB coupling ports is exactly 90 degrees. The 3-dB coupler is with higher power capacity because there is no electric field enhancement in the coupling area. When two 45 MW microwave pulses with phase difference of 90 degrees are injected from Port 3 and Port 4, the microwave energy will be composited and output from Port 2. The maximum electric field of 300kV/cm appears in the center of the output waveguide. Under the vacuum condition, the power capacity of the 3-dB coupler is up to 250MW.
关键词： SLED,high power capacity,3-dB,coupler,X-band
更新于2025-09-16 10:30:52
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[IEEE 2019 International Conference on Numerical Simulation of Optoelectronic Devices (NUSOD) - Ottawa, ON, Canada (2019.7.8-2019.7.12)] 2019 International Conference on Numerical Simulation of Optoelectronic Devices (NUSOD) - Energy Efficiency Analysis of GaN-based Superluminescent Diodes
摘要： Gallium-nitride-based superluminescent light-emitting diodes (SLEDs) are attractive light sources for augmented or virtual reality devices and other applications. However, the energy efficiency of SLEDs is still far below the peak values reported for LEDs and laser diodes. Utilizing advanced numerical device simulation, this paper investigates the internal physical processes that cause the low SLED efficiency.
关键词： superluminescent light-emitting diode,Gallium Nitride,SLED,efficiency
更新于2025-09-16 10:30:52
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What limits the efficiency of GaN-based superluminescent light-emitting diodes (SLEDs)?
摘要： Gallium-nitride-based SLEDs are attractive light sources for augmented reality displays and other applications. However, the electrical-to-optical power conversion efficiency (PCE) of SLEDs is still far below the record-high values reported for LEDs. Utilizing advanced numerical device simulation, this paper investigates the internal physical pro- cesses that cause the low PCE of SLEDs. The poor hole conductivity strongly reduces the electrical efficiency, similar to laser diodes. However, in contrast to laser diodes, the rising carrier density in the active layers is identified as main reason for enhanced Auger recom- bination that severely limits the internal quantum efficiency. Design improvement options are demonstrated.
关键词： Superluminescent light-emitting diode,Auger recombination,InGaN/GaN,Laser diode,Self-heating,Power conversion efficiency,SLED,Hole conductivity
更新于2025-09-12 10:27:22
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[Institution of Engineering and Technology CSAA/IET International Conference on Aircraft Utility Systems (AUS 2018) - Guiyang, China (19-22 June 2018)] CSAA/IET International Conference on Aircraft Utility Systems (AUS 2018) - A New Automatic Tracking and Shooting Technique Used in Seat Ejection Test Based on Image Recognition
摘要： In rocket sled tests, a new automatic tracking technique based on image recognition is proposed to adapt to the development of intelligent technology. The automatic tracking system is mainly composed of tracking camera, shooting camera and technique adopted Camshift as the main algorithm, and at the same time designed and optimized the tracing algorithm of the key points such as the target capture of the rocket sled, the ejection seat coming out of the cabin, and man-seat separation, there by achieving the automatic tracking of the whole process of rocket sled ejection seat test. In addition, by conducting a simulation experiment with the angular velocity of 120°/s and the speed of 1.2 Ma, the feasibility of automatic tracking system servo control strategy is verified. Based on this automatic tracking technology, the design of automatic tracking test system for seat ejection test is being carried out.
关键词： Image recognition,Automatic tracking,Rocket sled test,Ejection seat
更新于2025-09-09 09:28:46