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挠曲电材料在传感、驱动方面呈现出的优良特性,使其在结构健康监测领域具有极大应用前景。挠曲电系数是衡量材料挠曲电效应的重要指标,对其测定受限于微小位移、微小电量的精确测量。本文分析了测定挠曲电系数的关键环节,提出了测定挠曲电系数的实验方案,利用锁定放大器和压电微驱动器以及超景深三维显微镜构建测试平台,精确测量微电量及微位移,进而准确测定挠曲电系数。在室温下对钛酸锶钡(Ba0.75Sr0.25TiO3)试样进行了研究,初步测量了纵向挠曲电系数以及横向挠曲电系数,验证了用该平台测定挠曲电系数的可行性,为进一步开展挠曲电材料的研究和应用提供了基础实验平台。
The excellent properties of flexoelectric materials in terms of sensing and driving make them have great application prospects in the field of structural health monitoring. Flexural coefficient is an important measure of the material flexural electrical effect, its measurement is limited to small displacement, the precise measurement of small power. In this paper, the key points of measuring the flexoelectric coefficient are analyzed. An experimental scheme for the determination of flexural coefficient is proposed. The test platform is constructed by using a lock-in amplifier, a piezoelectric microactuator and a depth of field 3D microscope to accurately measure microdatalements and microdisplays, Flexural coefficient was measured. The samples of barium strontium titanate (Ba0.75Sr0.25TiO3) were investigated at room temperature. The longitudinal and transverse flexural coefficients of the barium titanate samples were measured. The feasibility of using this platform to test the flexural coefficients was verified. It provides a basic experimental platform for the further research and application of flexoelectric materials.