排序方式: 共有18条查询结果,搜索用时 78 毫秒
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使用多个线阵CCD-计算机系统实时监控多界面位置 总被引:1,自引:0,他引:1
本文提出一套多界面位置实时监控系统。该系统采用八个线阵CCD像感器分别接收每个界面的光学图像。按照控制程序的设定,适时点亮界面的照明光源,同时驱动CCD开始工作,并在采集完界面位置信息后,关掉照明光源及CCD,以延长系统的寿命,实现长期连续工作。为了同时分别监控多个界面,设计了专用微机接口电路,通过硬件电路实现各界面数据的同时锁存,然后将每个CCD的光电信号采入计算机,解决了目视读数无法保证多处数据在时间上一致性的困扰。运用该系统监控多处油水界面,每处均可在100mL体积的检测管内测量到0.1mL的界面变化。 相似文献
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We propose a new formula to describe the dynamics of holographic grating formation under low intensity pulse exposures in cationic photopolymers, in which the dark reaction contributes dominantly to the grating strength. The formula is based on the living polymerization mechanism and the diffusion-free approximation. The analytical solution indicates that the grating formation time depends on the termination rate constant, while the final grating strength depends linearly on the total exposure energy. These theoretical predictions are verified experimentally using the Aprilis HMC-400μm photopolymer. The results can provide guidelines for the control and optimization of the holographic recording conditions in practical applications. 相似文献
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CCD直接细分光栅位移传感器的研究 总被引:1,自引:0,他引:1
介绍一种采用CCD为测量元件的光栅位移传感器的设计方法。该方法利用CCD分辨率高、像素均匀的特点,对光栅刻线的像的移动进行精确定位和直接数字化,改变了以往对莫尔条纹进行位相细分的方法。该方法将细分和数字化在测量信号处理流程中的位置前移到光电转换环节,大大简化了后续电路,同时细分数也有大幅度提高,可以方便地实现数千倍的细分。在数据拼接时采用绝对栅距累加的方法,减小了光栅刻线质量对测量精度的影响。整个系统可由计算机通过并行端口进行控制 相似文献
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Insensitivity of Speckle Multiplexing to Multi—longitudinal Modes of Laser in Volume Holographic Storage 总被引:1,自引:0,他引:1 下载免费PDF全文
If a diode pumped solid state laser is used in a holographic storage system,its multi longitudinal modes may damage the angular selectivity of the hologram amd introduce more cross talk in the system.By theoretical analysis,we found that with adopting the speckle multiplexing scheme,holographic systems are no longer sensitive to the multi longitudinal modes of the laser source,and consequently the damage described above could be well suppressed.Moreover,the following high density storage experimental results also express strong advocacy of this conclusion.this result may greatly prompt the miniaturization of holographic stroage system. 相似文献
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