散射测量中的相关检测算法

为了提高系统的集成度,降低测量成本,用LabVIEW软件代替测量系统中的硬件锁相放大器,进而实现超光滑光学表面光散射参数的高性价比的准确测量。设计一种用于检测微弱散射光信号的测量系统,该测量系统由光路、光电探测、数据采集与控制、相关检测算法软件等部分组成。在分析测量系统原理的基础上,研究基于LabVIEW软件平台的锁相算法,提出在微弱光电信号检测中利用软件实现锁相检测的技术,并对其进行仿真实验分析。结果表明:当被测信号频率为0.2 kHz,幅值为1.0 V,噪声幅值为0.5 V时,测量误差为0.1%;证明该方法可有效实现对被调制微弱光电信号的检测。

Related Detection Algorithm in Scattering Measurement

In order to improve the integrated level of system and reduce the cost of measure, a high cost-effective and accurate measurement for the light scattering parameters of the super smooth optical surface is realized by using LabVIEW software to replace the hardware lock-in amplifier of measuring system. A photoelectric check system used for measuring light scattering are designed, the system is made up of light path, photoelectric detector, data acquisition and control system, the software for correlation detection algorithm etc. On that basis, the phase lock algorithm based on LabVIEW software platform is studied mainly in this paper. The technique for phase locked detection realized by software in the weak photoelectric signal detection is raised, and the technique is simulated. When measured signal frequency is 0.2 kHz, amplitude is 1.0 V and the noise amplitude is 0.5 V, the measurement error is 0.1%. The simulation result shows that the detection for the modulated weak photoelectric signal can be realized effectively by this method.