共查询到19条相似文献,搜索用时 187 毫秒
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以热释电探测器的工作原理为基础,研究了热释电探测器对重频脉冲激光的瞬态响应特性,建立了热释电探测器对单脉冲激光辐照响应的工作模型,分析了影响探测器频率特性的主要因素。根据材料和结构参数模拟计算了实际应用中的响应模型。设计了信号检测电路并对其进行计算仿真。完成了探测器的频率响应、脉宽响应等实验测量,验证了热释电探测器用于高重频、窄脉冲激光能量测量的可行性。 相似文献
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本文阐述了薄膜型热释电探测器原理及其薄膜的制备方法,进一步分析、整理了薄膜制备过程中的条件及参数。 相似文献
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本文提出了新的基于圆环孔阵列超材料的钽酸锂热释电太赫兹探测器,以提高0.1—1 THz频段太赫兹波探测性能.仿真分析了内外径、周期、厚度等特征参数对圆环孔阵列超材料太赫兹波透射带宽及透射率的定量影响关系,阐明了圆环孔阵列超材料与热释电探测器的不同结合方式对探测器的带宽及噪声等效功率的作用机理;制备了两种圆环孔阵列超材料钽酸锂热释电太赫兹探测器;测试了圆环孔阵列超材料的透射特性和两类热释电探测器的噪声等效功率.结果表明,所制备的圆环孔阵列超材料在0.25—0.65 THz频段透射率大于40%,实现了带通滤波.当圆孔阵列超材料与热释电探测器保持足够间距时,在0.315 THz点频其噪声等效功率为11.29μW/Hz0.5,是带通波段外0.1 THz噪声等效功率的6.3%,实现了带通探测;当圆环孔阵列超材料与热释电探测器贴合时,在0.315 THz点频其噪声等效功率为4.64μW/Hz0.5,是无圆环孔阵列超材料探测器噪声等效功率的29.4%,实现了窄带探测.上述结论可用于生物成像、大分子探测等领域中特定太赫兹波段的带通与窄带探测. 相似文献
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单晶热释电探测器混合集成制造方法研究 总被引:2,自引:0,他引:2
在比较几种探测器集成制造方法的基础上,提出采用各向异性导电膜作为电信号互联的手段,实现热释电探测器与信号处理电路的混合集成,从而演示了一种兼容性良好的集成化多传感器制造方法.对单晶钽酸锂热释电探测器采取机械研磨减薄获得其薄膜,利用3M的5552R各向异性导电膜,实现了探测器与信号读出电路的互联.对探测器的测试表明:机械研磨减薄获得的钽酸锂薄膜表现出与晶体接近的热释电特性,探测器表现出良好的绝热性质和动态响应特性. 相似文献
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利用热释电材料的热释电效应做成的光电接收器件称作热释电探测器.目前广泛用于制作热释电探测器的热释电单晶主要有两种:一种是硫酸三甘肽晶体(TGS)及其同类晶体(LATGS和 DLATGS等);另一种是袒酸锂晶体(LiTaO3).相应地,我们单位研制的热释电探测器有两个系列:KAT系列(由DLATGS 相似文献
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根据热释电探测器工作原理 ,对其使用特点进行了分析。在分光型红外气体分析器 (DIGA)设计原理基础上 ,建立了基于热释电探测器的红外气体分析系统输入输出数学模型。依据该模型研制了一个新型多组分红外气体分析器 ,并指出设计DIGA注意的若干问题。应用表明 ,该模型对DIGA的设计、研究、性能分析和进一步改进具有一定的参考价值 相似文献
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光伏型太赫兹量子阱探测器(PV-THzQWIP)是光伏型量子阱光电探测器(PV-QWIP)在THz波段的扩展,它具有功耗低、暗电流小、噪声水平低以及焦平面阵列(FPAs)热分辨率高等优点,是THz频段技术应用的重要器件之一.文章主要介绍了PV-THzQWIP的工作原理、特点、理论设计及其研究进展. 相似文献
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Nowadays, sensors play an important role in human life. Among the many manufacturing methods used in the fabrication of sensors, three-dimensional (3D) printing has gradually shown its advantages, particularly with commercial products. Physical sensors, biosensors, and chemical sensors can all be fabricated via 3D printing technology, through either directly printing sensing components, printing molds for casting sensors, or printing platforms to be integrated with commercial sensors. In this article, the varieties of features and applications of 3D printing technologies used in the fabrication of sensors are reviewed. Several types of 3D printing technologies are compared for better understanding of the tools. With the development of new or hybrid manufacturing methods and materials used in the 3D printing technology, this technology will show its great advantages and potential in the fabrication of highly sensitive nanosensors or compound sensors with 3D intricate structures. 相似文献
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非制冷红外焦平面阵列(UFPA)不可避免地存在无效像元, 这对UFPA的成像效果造成了极坏的影响。为解决这一问题, 在分析并总结各种非制冷红外焦平面无效像元识别算法优缺点的基础上, 提出一种新的无效像元识别与实时补偿方法。根据像元响应特性, 采用循环迭代法以搜索最优的无效像元判别阈值, 并据此标识出无效像元的位置。在硬件实现阶段, 对于M×N的UFPA器件, 在任意采样时刻, 利用移位寄存器保存当前采样点之前的M个响应值, 使其输出可实时更新为与采样点同列的上一个数据; 同时, 利用一般的寄存器实时保存与采样点同行的前一个数据, 采用同帧行列间内插法实现无效像元的实时补偿。该算法有效地解决了无效像元识别阈值选取困难及不易实时补偿的问题。针对320×240的UFPA器件, 该算法在基于FPGA的红外图像处理系统上得以实时实现, 成功地消除了无效像元对UFPA成像效果的影响。 相似文献
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非致冷焦平面热成像技术 总被引:4,自引:0,他引:4
简要介绍了三种非致冷红外探测器的技术途径和发展现状。从系统原理提出UFPA热像仪的设计概念以及必须解决的几个关键技术。分析UFPQ的性能极限和系统的性能水平,并与第一代轻型热像仪的MRTD曲线进行比较。 相似文献
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介绍了一种新颖的在常温下直接测量灰体表面方向发射率的方法。采用直接比对样品与参照物表面的光谱辐射率来测量方向发射率ε的绝对值。使用的传感器是热释电传感器,采用光学调制和锁相放大技术,实现对微弱信号的检测。设计的实验装置结构简单不需要制冷。在实验中,使用一块干净的浮法玻璃和氧化不锈钢作为测试样品,测试温度为50—200℃,将一块标定过的已知发射率为0.67的材料作为参照物。在没有制冷的条件下,与参照物和NPL数值、标定值相比较,实验得到的结果令人满意。 相似文献
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Manufacturing technology for the fabrication a discrete actuator
using a magnetic shape memory alloy
B. Spasova M. C. Wurz H. H. Gatzen 《The European physical journal. Special topics》2008,158(1):243-247
To demonstrate the feasibility of combining thin-film fabrication techniques and discrete MSM stripes, a hybrid actuator system
was designed. The actuator system consists of four thin-film stators and two discrete MSM stripes mounted in a row. For creating
an actuator motion, one of the MSM stripes has to be excited by a pair of stators to cause variant switching. This results
in an elongation plus a compression of the second stripe and vice versa. The technologies required for fabricating the thin-film
stator are sputter deposition, PECVD, electroplating, etching, and photolithography. This paper describes the fabrication
process for a thin-film stator used for the MSM micro actuator system. It also presents technology study results indicating
the feasibility of the planned fabrication sequence. 相似文献
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The commercial test equipments from Pulse Instruments, Lumitron and Electro Optical Industries Inc. are very expensive. So, we proposed a new method of very low cost test system for testing the non-uniformity and signal/noise (S/N) and other characteristics of the uncooled focal plane array (UFPA). It uses complex programmable logic device to generate the necessary pulse for the UFPA and the low noise low dropout micropower regulator to obtain the low noise bias. A proportional-integral-differential controlled thermal electrical cooler based on micro-processor unit stabilizes the UFPA. The National Instruments 6111E Data Acquisition Card is used to convert the analog output of UFPA into digital signal into computer. Its 12-bits conversion capability provides sufficient accuracy for evaluating the S/N ratio and non-uniformity of 128×128 pixels UFPA. Labview is used to analyze the signal. The instrument is fast and convenient to adapt the system to other types of UFPA. Further discussion is presented to determine factors that affect the accuracy of the tester. 相似文献
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With CMOS scaling approaching its limits, there is a great need for advancements in novel devices, disruptive fabrication
technologies, advanced materials and alternative computer architectures for future nanoelectronic systems. The emergence of
memristive devices is one of promising solutions for the post-CMOS era. In this paper, we first introduce the fabrication
of transition metal oxide based memristor cross-bars using nanoimprint lithography (NIL). The fabrication technique is further
improved by using only one NIL step, reducing the fabrication efforts and improving the device performance. With shadow evaporation,
a host of devices such as 2-terminal lateral memristors and 3-terminal memristive devices (memistors) are also demonstrated.
By building memristor cross-bar arrays on foundry-made CMOS substrates using NIL, we have implemented hybrid nano/CMOS architecture.
This hybrid chip provides an FPGA-like functionality with reconfigurable memristors defining data paths to wire logic gates
into digital circuits. Future trends and issues with fabrication of memristive devices are also briefly discussed. 相似文献