LIA_Final.py

import numpy as np
import math as m
from scipy.fft import fft, ifft,fftfreq
import eyes17.eyes
p=eyes17.eyes.open()
import time as t

################################ Lock in Amplifier ########################################
def LIA(V_in,t_in,f):   #V_in is the input voltage, t_in is the time list (in S),
    V_in_sin=[]         #f is the frequency
    V_in_cos=[]                      
    for i in range(len(V_in)):      
        V_in_sin.append(V_in[i]*2*np.sin(2*np.pi*f*t_in[i]))
        V_in_cos.append(V_in[i]*2*np.cos(2*np.pi*f*t_in[i]))
    V_out_sin_fft=fft(V_in_sin)
    V_out_cos_fft=fft(V_in_cos)
    V_out= np.sqrt((V_out_sin_fft[0].real/len(V_out_sin_fft))**2+(V_out_cos_fft[0].real/len(V_out_cos_fft))**2)
    return V_out
############################################################################################