上海科技大学知识管理系统

本发明公开了一种基于频分复用的多合一数据采集方法，其特征在于，包括以下步骤：将由N路光声信号以及N路载波信号分别输入N个乘法器，N路载波信号具有N个不同的载波频率，N≥4；每个乘法器分别输入一路光声信号以及一路载波信号后，将光声信号调制到相应的载波频率上后输出；N个乘法器输出的N路信号再通过一个加法器合并为一路信号后输入数字采集卡。本发明可以用信号源生成的高频载波信号调制光声信号，在频域上实现将多路信号合成一路以节省DAQ的通道数。最终可以在电脑端解调DAQ采集到的信号并重建图像。

The invention discloses an all-in-one data acquisition method based on frequency division multiplexing. The method is characterized by comprising the following steps of : respectively inputting N pathsof photoacoustic signals and N paths of carrier signals into N multipliers, wherein the N paths of carrier signals have N different carrier frequencies, and N is greater than or equal to 4; after each multiplier respectively inputs one path of photoacoustic signal and one path of carrier signal, modulating the photoacoustic signal to the corresponding carrier frequency and then outputting the photoacoustic signal; and combining the N paths of signals output by the N multipliers into one path of signal through an adder, and then inputting the signal into a digital acquisition card. According to the method, the photoacoustic signal can be modulated by using the high-frequency carrier signal generated by a signal source, and the multiple paths of signals are combined into one path in a frequency domain to save the number of channels of DAQ. Finally, the signal acquired by the DAQ can be demodulated at a computer end, and an image is reconstructed.