共查询到19条相似文献,搜索用时 62 毫秒
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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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晶体的32种对称类型中有21种没有对称中心,而在具有压电性的20种无对称中心的点群中,有10种点群的晶体具有热释电效应.这类晶体存在固有的自发极化,当晶体的温度变化时,自发极化强度也随之改变,与极化强度方向垂直的晶体表面产生过剩的热释电电荷.最早观察到热释电现象的矿石是电气石.十九世纪初发现罗息盐(酒石酸钾钠)的热释电性,以后又陆续发现很多晶体具有热释电性能.目前常用的红外探测器材料有硫酸三甘肽(TGS)、钽酸锂、铌酸锶钡以及钛酸铅陶瓷等.实用的热释电材料都是铁电体,它们的极化强度能随外加电场而反转.二十世纪三十年代有人… 相似文献
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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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热释电红外探测器在安全防护系统中的应用研究 总被引:7,自引:0,他引:7
利用人体发出的红外线,通过热释电红外传感器的接收和放大,形成具有一定电压幅度的控制信号,用这一控制信号去触发语音录放电路工作,就可制成具有自动控制功能的热释电红外探测语音录放系统。电路采用最新热释电红外探测模块与语音录放模块设计,当有人出现在热释电红外探测模块的探测范围时,热释电红外传感器首先将接收到的红外辐射能转换成电能信号,再经内部电路放大、比较处理后输出控制信号,触发语音录放模块工作,播放事先录制好的语音内容,提醒人们注意。该系统电路简洁、成本低、抗干扰能力强、耐低温、免调试、工作稳定和使用方便。适宜于安装在变电所、高压开关柜和电力变压器等危及人身安全的处所使用。 相似文献
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M. K. Kerimov É. A. Kerimov S. N. Musaeva A. E. Panich M. A. Kurbanov 《Physics of the Solid State》2007,49(5):925-929
The influence of structural and electrical parameters of the pyroelectric phase on the pyroelectric properties of composites based on poly(vinylidene fluoride), vinylidene fluoride-tetrafluoroethylene copolymer (F-42), and pyroelectric ceramics of the lead zirconate titanate family with different structures is investigated. It is revealed that the pyroelectric coefficient of the composite is determined by the reorientation polarization and the mobility of domains in the pyroelectric ceramic phase, which depend on the homogeneous parameter of the spontaneous strain of the perovskite cell. 相似文献
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A new type of spatial solitons i.e. pyroelectric photovoltaic spatial solitons based on the combination of pyroelectric and photovoltaic effect is predicted theoretically. It shows that bright, dark and grey spatial solitons can exist in unbiased photovoltaic photorefractive crystals with appreciable pyroelectric effect. Especially, the bright soliton can form in self-defocusing photovoltaic crystals if it gives larger self-focusing pyroelectric effect. 相似文献
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Gao Xiang 《International Journal of Infrared and Millimeter Waves》1990,11(5):641-649
In this paper, the application of the pyroelectric detectors for Far-Infrared laser diagnostics on TOKAMAK plasma is described. We discovered experimentally that the Fabry-Perot interference could affect the performance of the pyroelectric detectors (PED). The improved pyroelectric detector (IPD) was developed for FIR laser coheront measuring. Some designing considerations about the pyroelectric detectors used in high temperature plasma conditions are mentioned. 相似文献
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S. V. Yablonskii E. A. Soto-Bustamante 《Journal of Experimental and Theoretical Physics》2010,111(5):814-821
We show both theoretically and experimentally that passive amplification of the pyroelectric current takes place when modulated
radiation is recorded by a pyroelectric detector in some range of modulation frequencies. The amplification effect manifests
itself in the fact that the current generated by a thin pyroelectric film lying on a massive heat-conducting substrate exceeds
that in a freely suspended film. We use a ferroelectric 70:30 P(VDF-TrFE) copolymer, a crystalline guanidine pyroelectric,
and a 70:30 composition of an achiral liquid-crystal polymer and its monomer PM6R14n-M6R14n to illustrate the frequency dependence
of the pyroelectric current. 相似文献
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The pyroelectric signal from triglycine sulphate has been studied by a focussed He-Ne laser beam and a phase sensitive detection method. It is observed that anti-parallel domains give rise to pyroelectric signals of opposite polarity. The pyroelectric signal is zero when the laser spot is in between anti-parallel domains. The intensity of the pyroelectric signal is recorded and the domain structure is determined. 相似文献
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综述了红外传感器技术的最新发展,由于应用了薄膜型红外探测器,衍射光学聚光镜和共振压电斩波器,红外传感器实现了微型化,在许多领域中获得了广泛的应用。 相似文献
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《Infrared Physics & Technology》1999,40(2):79-82
The contributions of the primary and secondary pyroelectric effects and that of the tertiary pyroelectric effect are both considered in the discussion of the detection mechanism of type II pyroelectric detectors, and the total signal voltage and the voltage responsivity are given and analysed. 相似文献
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《Infrared Physics & Technology》1999,40(2):71-78
The contribution of the tertiary pyroelectric effect in LiTaO3 type II pyroelectric detectors is discussed according to the theory of thermoelastics and piezoelectrics, and the spatial bound charge and responsivity generated by the contribution of tertiary pyroelectric effect are described. 相似文献
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O'Sullivan JW Panarin YP Vij JK Seed AJ Hird M Goodby JW 《J Phys Condens Matter》1996,8(38):L551-L556
The effects of temperature and applied voltage on the pyroelectric properties of an antiferroelectric liquid crystal are given. It has been found that the pyroelectric signal depends strongly on the bias voltage across the sample. The pyroelectric signal behaviour is interpreted with the aid of spontaneous polarization data and good agreement is found between the results from the pyroelectric and polarization techniques. The spontaneous polarization of the sample exhibits the temperature- and field-induced `Devil's staircase' behaviour, as predicted by the Ising model. 相似文献