采用高温固相法制备了不同Tb³⁺掺杂浓度的NaGd（MoO₄）₂∶Tb³⁺荧光粉，XRD结果证实所制得样品为纯相。利用荧光光谱测量对该荧光粉的发光浓度猝灭进行了分析，证明荧光浓度猝灭是由Tb³⁺离子间的交换相互作用所导致，并符合浓度猝灭的Ozawa模型。采用Auzel提出的自产生猝灭模型对Tb³⁺的⁵D₄能级荧光动力学进行了分析，结果表明该模型能够很好地解释荧光寿命对浓度的依赖关系。研究了Tb³⁺的⁵D₄能级的发光强度和荧光寿命对样品温度的依赖关系，提出了利用荧光寿命进行温度传感的方法，并对温度传感的绝对和相对灵敏度进行了分析。

货币、身份证件、有价证券及商品的伪造和仿制严重威胁国家政治安全、金融稳定，侵害社会团体及个人利益。防伪技术是防范和抑制造假和克隆行为的有效手段，基于发光材料的防伪标签是当前防伪领域的研究热点。本文主要介绍近年来用于防伪标签的发光材料的研究进展，包括用于防伪标签发光材料的种类、防伪材料的发光机理、实现防伪鉴别所使用的激励源、发光防伪标签的设计方法及制作技术和防伪标签的鉴别方法等。此外，本文还对当前发光防伪材料存在的问题，以及未来发展趋势作了系统分析。

为了实现液晶屏字符高效、精准的自动化检测，针对液晶屏字符显示的断线、亮度缺陷，提出一种基于多特征矩融合的液晶屏字符缺陷检测算法。首先提取原始液晶屏图像中ROI区域，使用Hu不变矩来描述字符的结构特征，采用Zernike矩来弥补Hu矩所不能描述的高阶矩信息；然后使用颜色矩来描述字符的颜色特征，采用灰度矩弥补颜色矩所不能描述的灰度信息，并运用2DPCA技术融合上述矩阵，通过欧氏距离来衡量标准图像融合特征矩阵与待检测图像融合特征矩阵之间的相似度，通过设定相似度阈值来达到缺陷检测的目的。实验的客观和主观评价结果表明：主观上，该算法具有一定的稳定性、实用性；客观上，该算法相比于同类算法具有较低的误判率1%、漏判率0%以及较高的效率0.6 s，基本满足实际检测需求。

In order to solve the problem of low measurement accuracy caused by uneven imaging resolutions, we develop a three-dimensional catadioptric vision sensor using 20 to 100 lasers arranged in a circular array called omnidirectional dot maxtric projection (ODMP). Based on the imaging characteristic of the sensor, the ODMP can image the area with a high image resolution. The proposed sensor with ODMP can minimize the loss of the detail information by adjusting the projection density. In evaluating the performance of the sensor, real experiments show the designed sensor has high efficiency and high precision for the measurement of the inner surfaces of pipelines.

The existing two-dimensional vision measurement methods ignore lens distortion, require the plane to be perpendicular to the optical axis, and demand a complex operation. To address these issues, a new approach based on local sub-plane mapping is presented. The plane calibration is performed by dividing the calibration plane into sub-planes, and there exists an approximate affine invariance between each small sub-plane and the corresponding image plane. Thus, the coordinate transformation can be performed precisely, without lens distortion correction. The real comparative experiments show that the proposed approach is robust and yields a higher accuracy than the traditional methods.