A piece-wise transition detection algorithm that performs displacement measurements for self-mixing sensors is developed. The algorithm can correctly detect self-mixing fringes at a low signal-to-noise ratio in the presence of disturbances without filtering. Displacement reconstructions by the phase unwrapping method based on this algorithm are experimentally validated, with laser subject to the moderate feedback regime.

An alternative technique for infrasound detection based on the self-mixing (SM) interference of a laser diode is described. The principle involved is the dependence of the power emitted by the laser diode on infrasound-induced membrane vibration. The Fourier transform and fringe-counting methods are used to analyze the self-mixing signal. Infrasound signals are experimentally measured from 2 to 20 Hz with a resolution of 0.25, and the results well agree with the theoretical ones.

在Zn(NO3)2和Co(NO3)2溶液中, 以柠檬酸作为络合剂, 采用阴极恒电位沉积法直接在ITO衬底上制备出纯ZnO和Co掺杂ZnO(ZnO∶Co)纳米棒阵列膜。采用X射线衍射、扫描电镜和能量色散谱对所制备ZnO纳米棒的晶体结构和表面形貌进行了表征, 利用光致发光光谱研究了样品的发光性质。结果表明: 所制备的ZnO纳米棒呈六角纤锌矿结构, 具有沿(002)面择优生长特性, Co掺杂使ZnO纳米棒的直径变细。部分Co2+取代了Zn2+进入ZnO的晶格, 掺入量为2.2 at%左右。Co掺杂使ZnO的禁带宽度变窄, 紫外发射峰产生显著红移。