共查询到18条相似文献,搜索用时 125 毫秒
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本文首先介绍了CdS光敏电阻光照特性的一种测试方法,然后设计了两个应用实验,一个是通过光敏电阻测量玻璃砖的光吸收系数,另一个是运用光敏电阻来控制蜂鸣器报警与路灯照明,并给出实验结果. 相似文献
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LP—1激光功率计原理及其在物理实验中的应用 总被引:3,自引:0,他引:3
在光学实验中有很多需要测量光强的实验,如光度测量、光学成象系统的照度、菲涅耳衍射的光强分布、偏振光的研究、迈克尔逊干涉仪测量光源的相干长度、菲涅耳公式的研究等。常用的测光元件有光敏电阻、硒光电池、硅光电二极管和光电倍增管。光敏电阻的线性较差,仅在弱光和小范围(如一个数量级)内光电导和照度之间可作线性 相似文献
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《Physica E: Low-dimensional Systems and Nanostructures》2011,43(10):2614-2617
The interference of magneto-intersubband oscillations and microwave-induced resistance oscillations is studied in high-density triple quantum wells. We give an introduction into magnetotransport in trilayer systems and focus on photoresistance measurements. The power and frequency dependence of the observed magnetoresistance oscillations can be described by the inelastic mechanism of photoresistance, generalized to the three-subband case. 相似文献
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Z. D. Kvon K.-M. Dantscher M.-T. Scherr A. S. Yaroshevich N. N. Mikhailov 《JETP Letters》2016,104(10):716-720
The terahertz resistive response of a two-dimensional topological insulator in a HgTe quantum well in the quasiballistic transport regime is studied. The photoresistance appearing only near the charge neutrality point is detected. The application of the magnetic field up to 4 T in the plane of the quantum well results in an increase in the photoresistance in the peak and in the expansion of the region near the charge neutrality point where it exists. The reported results imply that the observed photoresistance is due to transitions involving edge dispersion branches of the two-dimensional topological insulator. 相似文献
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研制了可用于脉冲辐射场中子探测的4He闪烁裂变中子探测器,并对其时间响应进行了理论和实验研究。采用经验公式和蒙特卡罗方法模拟计算了不同厚度裂变靶产生的裂变碎片和不同能量中子产生的反冲4He核在4He气中的飞行时间,并依据卷积原理推导出探测器的时间响应计算公式。计算结果表明,探测器的波形上升时间约为19.5 ns,半高宽约31.0 ns。用ING-103型稠密等离子体聚焦装置(DPF)脉冲中子发生器对探测器的时间响应进行了实验测量,实验结果与理论值基本一致。 相似文献
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Light-transforming polymeric materials based on two luminophor dopants (europium(III) nitrate with 1,10-phenanthroline and quinaldic acid characterized by intense luminescence in the spectral range of 400–650 nm) have been fabricated. It has been established that the photoresistance of polymeric materials based on the fabricated composites is higher than that of the polymeric material activated with europium(III) nitrate with 1,10-phenanthroline. It has been also established that luminescence and photochemical characteristics of polymeric composites are determined by the dopant molar ratio: the maximum luminescence intensity and photoresistance characterize the polymeric material containing europium(III) nitrate with 1,10-phenathroline and quinaldic acid at a molar ratio of 1: 2. 相似文献
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G. E. Malashkevich V. B. Prokopenko D. V. Dem’yanenko I. M. Mel’nichenko 《Physics of the Solid State》1999,41(11):1815-1820
A sol-gel method is used to synthesize silicate films dyed in the sol stage with rhodamine C or methylene blue and further
doped with cerium or lanthanum. It is shown that this sort of doping leads to a reduction in the peak intensity and a change
in the shape of the S
1←S
0 band of the dyes, as well as to a shift in this band in a direction that depends on the H2O: Si(OC2H5)4 ratio. At the same time, the photoresistance of the rhodamine C molecules increases. The observed spectral changes are explained
by the formation of supramolecules that include organic molecules, rare earth ions, and elements from the structural grid
of the film, while the enhanced photoresistance is explained mainly by strengthening of the T
1→S
0 transitions in the dye.
Fiz. Tverd. Tela (St. Petersburg) 41, 1979–1984 (November 1999) 相似文献
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The time domain method is more reliable for the study of nonlinear dielectric response compared with frequency domain analysis. A Tikhonov regularization method, which is widely adopted for ill-posed problem, is described for derivation of the relaxation time distribution function, g(τ), from the ferroelectric discharge current in time domain. The new method allows study of the structure variation and the relaxation behavior of ferroelectrics at different temperatures. For barium stannate titanate ceramics (BTS20), g(τ) has been successfully derived; the relaxation peaks move to shorter times with increasing temperature in the range 20–60°C, which may indicate a space charge thermal activation process. However, g(τ) could not be derived from the discharge current by the regularization method for BTS20 at temperatures above 60°C or for lanthanum-doped lead zirconium titanate transparent ceramic (PLZT), since the data do not satisfy the discrete Picard condition, which is a valid criterion for regularization method. 相似文献