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Fast processing of optical fringe movement in displacement sensors without using an ADC

机译:无需使用ADC即可快速处理位移传感器中的光学条纹运动

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An interferometer based optical sensor for displacement measurement is reported. This method requires quite simple signal processing as well as least electronic components. Referring to this technique, two photodiodes spatially shifted by 90 degrees were used. The output of photodiodes was converted into rectangular signals which were extracted in LabVIEW using the data acquisition card without using an analog to digital converters (ADC). We have also processed the signals in C++ after acquiring via parallel port. A Michelson interferometer configuration was used to produce linear fringes for the detection of displacements. The displacement less than 100 nm could be measured using this technique.
机译:报道了基于干涉仪的用于位移测量的光学传感器。这种方法需要非常简单的信号处理以及最少的电子元件。参照该技术,使用了在空间上错开90度的两个光电二极管。将光电二极管的输出转换为矩形信号,然后在LabVIEW中使用数据采集卡将其提取,而无需使用模数转换器(ADC)。通过并行端口获取信号后,我们还使用C ++处理了信号。迈克尔逊干涉仪配置用于产生用于检测位移的线性条纹。使用该技术可以测量小于100 nm的位移。

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