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关于锁相放大器有些问题我一直弄不懂。

关于锁相放大器有些问题我一直弄不懂。待测信号与参考信号的关系是怎么样的?待测信号是混杂在噪声信号中的,根据哪些条件去设置参考信号?如何才能知道提取出来的信号是否与噪声信号成功分离?我看了一下锁相放大器的原理,由于能力有限,还是没有解决。水平有限,望请大家帮帮忙!