共查询到16条相似文献,搜索用时 64 毫秒
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针对瞬态微光信号动态范围大、低端信号微弱的特点,提出一种新的对数域压缩探测方案.基于该方案的设计原理分析,选择合适器件,完成电路设计进行实验验证.实验研究表明,该方案可将120 dB的瞬态光信号压缩到0~5 V的范围内,在降低了电路复杂性和功耗的同时,可大大缓解后级数据采集单元的设计压力. 相似文献
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(以CMOS图像传感器LUPA-1300-2为对象,研究了多斜率积分功能)在空间瞬态光探测系统中的应用.以ACTEL公司APA600 Flash型FPGA为硬件载体,分析设计了其驱动控制,验证了LUPA-1300-2的易操作性,结果表明,该功能可以降低系统的复杂程度和提高系统观测的动态范围,有利于观测瞬态光点周围的瞬间变化,从而提高系统的可靠性和信息收集能力. 相似文献
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本文阐述了图像分割技术的原理和在全息图处理中的应用,给出了基于边缘检测的图像分割技术的整个实现过程,实验研究了阈值方法分割和结合边缘检测方法分割全息图像,并给出了处理后的结果,本文对用全息方法测量粒子场的数据处理有一定的意义。 相似文献
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瞬态液晶技术在涡轮叶片内部冷却研究中的应用 总被引:3,自引:0,他引:3
瞬态液晶测量技术能有效测量物体表面的换热系数,目前已经在传热研究中得到了广泛的应用。本文重点介绍了该测量方法在高温涡轮叶片内部冷却传热研究中的实验过程及应用。对内部冷却U型通道的传热研究表明:气膜抽吸作用下,通道内孔附近的传热得到强化,但区域平均传热系数变化不大;同时抽吸能使带肋通道中的压力损失有所降低。为了满足叶片冷却设计中对传热和压力损失的不同要求,改变弯头区的结构形式是一种有效的手段。实验结果进一步表明,瞬态液晶测量方法能准确地测量内部冷却通道中的传热分布,能为测量和优化涡轮叶片内部冷却传热特性提供可靠的数据支持。 相似文献
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介绍了多道ICP-AES多元素瞬时信号检测处理集成软件的研制过程,应用该软件实现了多道ICP-AES和多种瞬时进样技术在线联用的信号采集、处理。 相似文献
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We propose a novel signal processing technique by which we can increase the effective signal to noise ratio of optical discs. This technique is capable of reducing the influence of random noise even when the playback signal contains a distortion. We apply this signal processing technique to single carrier independent pit edge recording optical disc system. When a linear recording density of 0.2 μm/bit and a track pitch of 0.8 μm for an optical pickup is used in a DVD pickup (γ =635 nm, NA=0.6), the experimental results show that the system can obtain tangential and radial skew margins of ±0.5° and ±0.75°, respectively. From the experimental results, we estimate that the proposed method is capable of increasing the capacity of DVD by a factor of about 1.2. 相似文献
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利用正交双路光纤传输光电流信号的处理方法,满足了光纤电流互感器在电力系统暂态保护应用中的实时处理要求.此方法可从正交双路光信号中直接提取两路电流信息,减小了光路传输不理想对电流测量值的影响.结合模数变换过采样技术和先进的数字信号处理技术,提高了系统对暂态故障的响应速度,改进了检测性能.实验表明,此方法在暂态信号的采集和实时处理方面,比现有方法的迟延小且精度高. 相似文献
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T. A. Moniem 《Fiber and Integrated Optics》2016,35(3):114-127
This article presents a methodology for an integrated Bragg grating using an alloy of GaAs, AlGaAs, and InGaAs with a controllable refractive index to obtain an adaptive Bragg grating suitable for many applications on optical processing and adaptive control systems, such as limitation and filtering. The refractive index of a Bragg grating is controlled by using an external electric field for controlling periodic modulation of the refractive index of the active waveguide region. The designed Bragg grating has refractive indices programmed by using that external electric field. This article presents two approaches for designing the controllable refractive indices active region of a Bragg grating. The first approach is based on the modification of a planar micro-strip structure of the iGaAs traveling wave as the active region, and the second is based on the modification of self-assembled InAs/GaAs quantum dots of an alloy from GaAs and InGaAs with a GaP traveling wave. The overall design and results are discussed through numerical simulation by using the finite-difference time-domain, plane wave expansion, and opto-wave simulation methods to confirm its operation and feasibility. 相似文献