Question

我目前正在尝试傅里叶变换激光光谱。原始数据是文本文件格式，我使用numpy导入数据。

由于数据是针对激光光谱的，因此X值是激光的波长，Y值代表激光的强度。

使用下面的代码，我将激光光谱绘制为

import numpy as np
import matplotlib.pyplot as plt
from pylab import genfromtxt
from matplotlib import pyplot

filelist = []
time = [0.00,-1.33,-2.67,-4.00,-5.33,-6.67]
offset = 0

index = 0

filelist.append("0.SSM")

for i in range (1,6):
    filelist.append("-%s00.SSM" %i)

for fname in filelist:
    data = np.genfromtxt(fname, delimiter='  ',unpack=True,skip_header=2)
    X=data[0,:]
    Y=data[1,:]
    offset = offset + 500
    plt.plot(X,Y+offset,label=str(time[index])+'ps')
    index=index+1
    plt.xlim([759,850])
    axes=plt.gca

pyplot.title("Laser Spectrum of Both Pumps with Negative Time Delay(Pump 1 = 796nm, Pump 2 = 804nm)")
plt.xlabel("Wavelength[nm]")
plt.ylabel("Counts[arb.unit]")
plt.legend(loc='best')
plt.savefig('796and804nmminus')
plt.show()

这就是我的激光光谱的样子。

这里的问题是当我尝试傅里叶变换这个图时。我傅里叶变换了Y值并手动将X值（波长）转换为时间。（通过使用电磁波的波长 - 频率关系）

我认为我处理X值的方式是错误的，因为它不是从0开始。当它们保存在数组中时，有没有办法根据X值对Y值进行傅里叶变换？

我用于傅立叶变换的代码如下。由于这是试运行，因此只使用了一个文本文件来存储数据。

import numpy as np
import matplotlib.pyplot as plt
from pylab import genfromtxt
from matplotlib import pyplot

filelist = []
from scipy.fftpack import fft, ifft,rfft

sol = 299792458.00 #this is the speed of light in m/s


time = [0.00]

offset = 0

index = 0

filelist.append("0.SSM")

# for i in range (1,6):
#     filelist.append("-%s00.SSM" %i)

for fname in filelist:
    data = np.genfromtxt(fname, delimiter='  ',unpack=True,skip_header=2)
    X=data[0,:]
    F=sol/X
    Y=data[1,:]
    Z1=rfft(Y)

    time1 = (1/F)*10**6

    plt.plot(time1,Z1,label=str(time[index])+'ps')
    index=index+1
    plt.xlim([2.2,2.5])
    axes=plt.gca

pyplot.title("Laser Spectrum of Both Pumps with Negative Time Delay(Pump 1 = 796nm, Pump 2 = 804nm)")
plt.xlabel("Time[ms]")
plt.ylabel("Counts[arb.unit]")
plt.legend(loc='best')
plt.savefig('796and804nmminus')
plt.show()

这就是我的＆＃34;傅里叶变换＆＃34;（至少我认为英国“金融时报”工作）图表的样子。

我的数学知识和编程知识都有点不稳定，所以非常感谢任何帮助/建议。

顺便说一句，这就是我的数据文件的样子

" File: Sabrina\20171212\796and804\0.SSM
" SCOPE->  Wave:814.54nm  Pix:1050  Val:225.600  Time:5ms  Avg:5  Sm:1  Sg:0  Tc:off  Z Y  Xt:1  Ch:1 
 688.00  2.113E+002
 688.25  2.093E+002
 688.50  2.116E+002
 688.75  2.166E+002
 689.00  2.125E+002
 689.25  2.130E+002
 689.50  2.096E+002
 689.75  2.139E+002
 690.00  2.138E+002
 690.25  2.128E+002
 690.50  2.117E+002
 690.75  2.087E+002
 691.00  2.079E+002
 691.25  2.098E+002
 691.50  2.114E+002
 691.75  2.114E+002
 692.00  2.116E+002
 692.25  2.135E+002
 692.50  2.150E+002
 692.75  2.146E+002
 693.00  2.131E+002
 693.25  2.125E+002
 693.50  2.115E+002
 693.75  2.110E+002
 694.00  2.126E+002
 694.25  2.135E+002
 694.50  2.135E+002
 694.75  2.141E+002
 695.00  2.154E+002
 695.25  2.171E+002
 695.50  2.176E+002
 695.75  2.183E+002
 696.00  2.181E+002
 696.25  2.154E+002
 696.50  2.141E+002
 696.75  2.141E+002
 697.00  2.160E+002
 697.25  2.165E+002
 697.50  2.168E+002
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 699.75  2.148E+002
 700.00  2.164E+002
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 700.75  2.195E+002
 701.00  2.196E+002
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 701.50  2.213E+002
 701.75  2.218E+002
 702.00  2.217E+002
 702.25  2.222E+002
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 704.00  2.191E+002
 704.25  2.187E+002
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 821.75  2.268E+002
 822.00  2.280E+002
 822.25  2.274E+002
 822.50  2.249E+002
 822.75  2.242E+002
 823.00  2.249E+002
 823.25  2.247E+002
 823.50  2.250E+002
 823.75  2.252E+002
 824.00  2.232E+002
 824.25  2.220E+002
 824.50  2.230E+002
 824.75  2.243E+002
 825.00  2.262E+002
 825.25  2.280E+002
 825.50  2.274E+002
 825.75  2.242E+002
 826.00  2.212E+002
 826.25  2.196E+002
 826.50  2.205E+002
 826.75  2.201E+002
 827.00  2.193E+002
 827.25  2.204E+002
 827.50  2.227E+002
 827.75  2.235E+002
 828.00  2.226E+002
 828.25  2.222E+002
 828.50  2.229E+002
 828.75  2.251E+002
 829.00  2.252E+002
 829.25  2.248E+002
 829.50  2.231E+002
 829.75  2.228E+002
 830.00  2.228E+002
 830.25  2.238E+002
 830.50  2.256E+002
 830.75  2.249E+002
 831.00  2.235E+002
 831.25  2.227E+002
 831.50  2.229E+002
 831.75  2.220E+002
 832.00  2.221E+002
 832.25  2.210E+002
 832.50  2.221E+002
 832.75  2.267E+002
 833.00  2.289E+002
 833.25  2.266E+002
 833.50  2.249E+002
 833.75  2.236E+002
 834.00  2.231E+002
 834.25  2.219E+002
 834.50  2.199E+002
 834.75  2.201E+002
 835.00  2.213E+002
 835.25  2.228E+002
 835.50  2.251E+002
 835.75  2.277E+002
 836.00  2.285E+002
 836.25  2.262E+002
 836.50  2.221E+002
 836.75  2.199E+002
 837.00  2.190E+002
 837.25  2.189E+002
 837.50  2.193E+002
 837.75  2.195E+002
 838.00  2.189E+002
 838.25  2.200E+002
 838.50  2.221E+002
 838.75  2.230E+002
 839.00  2.250E+002
 839.25  2.266E+002
 839.50  2.272E+002
 839.75  2.254E+002
 840.00  2.243E+002
 840.25  2.248E+002
 840.50  2.240E+002
 840.75  2.214E+002
 841.00  2.195E+002
 841.25  2.189E+002
 841.50  2.196E+002
 841.75  2.207E+002
 842.00  2.215E+002
 842.25  2.224E+002
 842.50  2.230E+002
 842.75  2.238E+002
 843.00  2.236E+002
 843.25  2.217E+002
 843.50  2.204E+002
 843.75  2.210E+002
 844.00  2.215E+002
 844.25  2.204E+002
 844.50  2.188E+002
 844.75  2.177E+002
 845.00  2.194E+002
 845.25  2.213E+002
 845.50  2.222E+002
 845.75  2.210E+002
 846.00  2.193E+002
 846.25  2.196E+002
 846.50  2.206E+002
 846.75  2.205E+002
 847.00  2.207E+002
 847.25  2.217E+002
 847.50  2.223E+002
 847.75  2.240E+002
 848.00  2.251E+002
 848.25  2.239E+002
 848.50  2.191E+002
 848.75  2.164E+002
 849.00  2.161E+002
 849.25  2.167E+002
 849.50  2.178E+002
 849.75  2.204E+002
 850.00  2.227E+002
 850.25  2.239E+002
 850.50  2.239E+002
 850.75  2.225E+002
 851.00  2.217E+002
 851.25  2.207E+002
 851.50  2.209E+002
 851.75  2.205E+002
 852.00  2.197E+002
 852.25  2.176E+002
 852.50  2.160E+002
 852.75  2.167E+002
 853.00  2.188E+002
 853.25  2.184E+002
 853.50  2.204E+002
 853.75  2.224E+002
 854.00  2.232E+002
 854.25  2.238E+002
 854.50  2.250E+002
 854.75  2.237E+002
 855.00  2.192E+002
 855.25  2.161E+002
 855.50  2.145E+002
 855.75  2.142E+002
 856.00  2.169E+002
 856.25  2.196E+002
 856.50  2.211E+002
 856.75  2.220E+002
 857.00  2.216E+002
 857.25  2.222E+002
 857.50  2.224E+002
 857.75  2.225E+002
 858.00  2.221E+002
 858.25  2.221E+002
 858.50  2.201E+002
 858.75  2.176E+002
 859.00  2.183E+002
 859.25  2.205E+002
 859.50  2.214E+002
 859.75  2.214E+002
 860.00  2.214E+002
 860.25  2.197E+002
 860.50  2.182E+002
 860.75  2.168E+002
 861.00  2.156E+002
 861.25  2.163E+002
 861.50  2.184E+002
 861.75  2.202E+002
 862.00  2.211E+002
 862.25  2.198E+002
 862.50  2.197E+002
 862.75  2.212E+002
 863.00  2.223E+002
 863.25  2.198E+002
 863.50  2.192E+002
 863.75  2.162E+002
 864.00  2.162E+002
 864.25  2.176E+002
 864.50  2.195E+002
 864.75  2.208E+002
 865.00  2.200E+002
 865.25  2.180E+002
 865.50  2.165E+002
 865.75  2.164E+002
 866.00  2.158E+002
 866.25  2.154E+002
 866.50  2.172E+002
 866.75  2.205E+002
 867.00  2.230E+002
 867.25  2.224E+002
 867.50  2.234E+002
 867.75  2.235E+002
 868.00  2.238E+002
 868.25  2.227E+002
 868.50  2.221E+002
 868.75  2.211E+002
 869.00  2.191E+002
 869.25  2.170E+002
 869.50  2.173E+002
 869.75  2.181E+002
 870.00  2.193E+002
 870.25  2.189E+002
 870.50  2.184E+002
 870.75  2.181E+002
 871.00  2.182E+002
 871.25  2.191E+002
 871.50  2.200E+002
 871.75  2.196E+002
 872.00  2.170E+002
 872.25  2.143E+002
 872.50  2.123E+002
 872.75  2.120E+002
 873.00  2.128E+002
 873.25  2.131E+002
 873.50  2.151E+002
 873.75  2.178E+002
 874.00  2.209E+002
 874.25  2.230E+002
 874.50  2.213E+002
 874.75  2.187E+002
 875.00  2.165E+002
 875.25  2.169E+002
 875.50  2.181E+002
 875.75  2.187E+002
 876.00  2.178E+002
 876.25  2.172E+002
 876.50  2.164E+002
 876.75  2.156E+002
 877.00  2.148E+002
 877.25  2.152E+002
 877.50  2.175E+002
 877.75  2.167E+002
 878.00  2.165E+002
 878.25  2.186E+002
 878.50  2.220E+002
 878.75  2.218E+002
 879.00  2.190E+002
 879.25  2.170E+002
 879.50  2.173E+002
 879.75  2.190E+002
 880.00  2.205E+002
 880.25  2.225E+002
 880.50  2.216E+002
 880.75  2.194E+002
 881.00  2.179E+002
 881.25  2.161E+002
 881.50  2.148E+002
 881.75  2.145E+002
 882.00  2.158E+002
 882.25  2.173E+002
 882.50  2.177E+002
 882.75  2.180E+002
 883.00  2.196E+002
 883.25  2.198E+002
 883.50  2.175E+002
 883.75  2.172E+002
 884.00  2.170E+002
 884.25  2.156E+002
 884.50  2.147E+002
 884.75  2.146E+002
 885.00  2.169E+002
 885.25  2.177E+002
 885.50  2.174E+002
 885.75  2.176E+002
 886.00  2.182E+002
 886.25  2.188E+002
 886.50  2.206E+002
 886.75  2.198E+002
 887.00  2.172E+002
 887.25  2.158E+002
 887.50  2.159E+002
 887.75  2.161E+002
 888.00  2.153E+002
 888.25  2.153E+002
 888.50  2.166E+002
 888.75  2.170E+002
 889.00  2.155E+002
 889.25  2.162E+002
 889.50  2.185E+002
 889.75  2.186E+002
 890.00  2.171E+002
 890.25  2.161E+002
 890.50  2.158E+002
 890.75  2.170E+002
 891.00  2.172E+002
 891.25  2.158E+002
 891.50  2.138E+002
 891.75  2.134E+002
 892.00  2.149E+002
 892.25  2.166E+002
 892.50  2.189E+002
 892.75  2.205E+002
 893.00  2.196E+002
 893.25  2.185E+002
 893.50  2.177E+002
 893.75  2.160E+002
 894.00  2.137E+002
 894.25  2.128E+002
 894.50  2.142E+002
 894.75  2.166E+002
 895.00  2.185E+002
 895.25  2.196E+002
 895.50  2.198E+002
 895.75  2.180E+002
 896.00  2.170E+002
 896.25  2.164E+002
 896.50  2.167E+002
 896.75  2.178E+002
 897.00  2.166E+002
 897.25  2.142E+002
 897.50  2.139E+002
 897.75  2.139E+002
 898.00  2.142E+002
 898.25  2.144E+002
 898.50  2.134E+002
 898.75  2.117E+002
 899.00  2.129E+002
 899.25  2.136E+002
 899.50  2.142E+002
 899.75  2.156E+002
 900.00  2.161E+002
 900.25  2.152E+002
 900.50  2.140E+002
 900.75  2.124E+002
 901.00  2.125E+002
 901.25  2.141E+002
 901.50  2.158E+002
 901.75  2.164E+002
 902.00  2.164E+002
 902.25  2.156E+002
 902.50  2.119E+002
 902.75  2.093E+002
 903.00  2.116E+002
 903.25  2.140E+002
 903.50  2.154E+002
 903.75  2.169E+002
 904.00  2.169E+002
 904.25  2.165E+002
 904.50  2.165E+002
 904.75  2.175E+002
 905.00  2.173E+002
 905.25  2.146E+002
 905.50  2.132E+002
 905.75  2.148E+002
 906.00  2.167E+002
 906.25  2.162E+002
 906.50  2.161E+002
 906.75  2.158E+002
 907.00  2.139E+002
 907.25  2.118E+002
 907.50  2.117E+002
 907.75  2.128E+002
 908.00  2.144E+002
 908.25  2.147E+002
 908.50  2.140E+002
 908.75  2.132E+002
 909.00  2.129E+002
 909.25  2.135E+002
 909.50  2.140E+002
 909.75  2.139E+002
 910.00  2.135E+002
 910.25  2.146E+002
 910.50  2.152E+002
 910.75  2.148E+002
 911.00  2.150E+002
 911.25  2.159E+002
 911.50  2.162E+002
 911.75  2.154E+002
 912.00  2.137E+002
 912.25  2.134E+002
 912.50  2.136E+002
 912.75  2.141E+002
 913.00  2.130E+002
 913.25  2.118E+002
 913.50  2.150E+002
 913.75  2.200E+002
 914.00  2.211E+002
 914.25  2.196E+002
 914.50  2.176E+002
 914.75  2.132E+002
 915.00  2.100E+002
 915.25  2.098E+002
 915.50  2.098E+002
 915.75  2.105E+002
 916.00  2.118E+002
 916.25  2.116E+002
 916.50  2.124E+002
 916.75  2.140E+002
 917.00  2.157E+002
 917.25  2.159E+002
 917.50  2.155E+002
 917.75  2.146E+002
 918.00  2.146E+002
 918.25  2.174E+002
 918.50  2.187E+002
 918.75  2.163E+002
 919.00  2.155E+002
 919.25  2.141E+002
 919.50  2.122E+002
 919.75  2.122E+002
 920.00  2.134E+002
 920.25  2.163E+002
 920.50  2.185E+002
 920.75  2.205E+002
 921.00  2.205E+002
 921.25  2.190E+002
 921.50  2.160E+002
 921.75  2.148E+002
 922.00  2.149E+002
 922.25  2.144E+002
 922.50  2.151E+002
 922.75  2.144E+002
 923.00  2.134E+002
 923.25  2.146E+002
 923.50  2.177E+002
 923.75  2.195E+002
 924.00  2.178E+002
 924.25  2.167E+002
 924.50  2.171E+002
 924.75  2.174E+002
 925.00  2.165E+002
 925.25  2.158E+002
 925.50  2.143E+002
 925.75  2.139E+002
 926.00  2.165E+002
 926.25  2.175E+002
 926.50  2.164E+002
 926.75  2.156E+002
 927.00  2.161E+002
 927.25  2.169E+002
 927.50  2.159E+002
 927.75  2.163E+002
 928.00  2.176E+002
 928.25  2.165E+002
 928.50  2.133E+002
 928.75  2.111E+002
 929.00  2.118E+002
 929.25  2.124E+002
 929.50  1.961E+002
 929.75  4.606E+001

X，Y数据的傅立叶变换（Python）

0 个答案: