labview源码，包括锁相放大器，运算放大器，信号发生器，数字示波器，数字电压测试仪等-labview source code, including the lock-in amplifier, operational amplifier, signal generator, digital oscilloscope, digital voltage tester, etc.

通过labview控制信号发生器和锁相放大器进行共振频率检测的程序。freq test.vi实现信号发生器的频率扫描，lockin test.vi 实现锁相放大器的参数设定，数据采集.vi实现锁相数据的采集，waveform arrays to file实现波形数据到文件数据的转换。共振频率测试.vi实现晶振等共振频率的测试-Resonance frequency detection procedures performed by labview control signal generator

此LABVIEW程序可将采用波长调制法探测得到的信号进行二次谐波解调，功能类似于锁相放大器。(he LABVIEW program can demodulate the signals detected by the wavelength modulation method with two harmonics.)

利用LabVIEW实现锁相放大器的功能，用于提取特定频率的有用信号的幅值，过滤噪声干扰，可以选择参考信号源为方波/正弦波(An lock-in amplifier built in LabVIEW)