Special techniques of acquiring weak signal are used in the designing of the instrument, including high precision source modulation technique and phase sensitivity detection technique.
仪器采用了高精度的光源调制技术,相敏检测技术等弱信号提取技术,单片机系统全部采用新型I2C或SPI集成电路芯片设计,具有测量精度高、体积小、功耗低等特点,适用于水中矿物油和动植物油含量的检测。
The frequency spectrum analysis method, correlation method and phase sensitive detection method were used to extract the phase difference.
方法:使用LabVIEW对数据采集卡编程,实现信号的采集,并使用频谱分析法、相关法以及相敏检测法提取参考信号与检测信号的相位差,实现软件鉴相。