基于LabVIEW的弹光调制型傅里叶变换光谱实时复原

Real-time restoration of photo-elastic modulation Fourier transform spectrum based on LabVIEW

针对弹光调制型傅里叶变换光谱仪难以采集到一个完整周期的激光干涉信号,并且无法对其进行光谱实时复原的问题,设计了基于LabVIEW的弹光调制型傅里叶变换光谱实时复原。首先,选用波长为632.8 nm的氦氖激光器作为光源,经过弹光调制型傅里叶变换光谱仪后,产生随时间变化的干涉信号,然后再通过光电探测器对干涉信号进行转换,获取干涉数据。最后用高速数据采集卡将数据采集下来并传输到LabVIEW上位机,对干涉数据进行光谱复原中的数据处理,并进行波长标定和复原分析。实验表明,对采集的单色激光在上位机LabVIEW能获取到一个完整周期的干涉信号,并经光谱复原算法可以实时复原得到频谱图,复原激光误差小于1 nm,半峰宽为0.01μm。

Aiming at the problem that it is difficult for the photo-elastic modulation Fourier transform spectrometer to collect a complete period of laser interference signal and cannot perform the real-time restoration of the spectrum, designs a real-time restoration of the photo-elastic modulation Fourier transform spectrum based on LabVIEW. First, a He-Ne laser with a wavelength of 632.8 nm is selected as the light source. After the incident laser passes through the photo-elastic modulation Fourier transform spectrometer, an interference signal that changes with time is generated, and then the interference signal is converted by a photo-elastic detector to obtain interference data. Finally, use a high-speed data acquisition card to collect the data and transmit it to the LabVIEW host computer, perform data processing in the spectrum restoration of the interference data, and perform wavelength calibration and restoration analysis. Experiments show that LabVIEW can obtain a complete cycle of the interference signal from the collected monochromatic laser on the host computer, and the spectrum restoration algorithm can be used to restore the spectrogram in real time. The error of the restored laser is less than 1 nm, and the half-peak width is 0.01 μm.