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vega2shane.py
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vega2shane.py
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import numpy as np
import matplotlib.pyplot as mp
import simIrcal as si
import simshane as ss
#from itertools import cycle
# Read in vega flux file
vega = np.loadtxt('spectra/alpha_lyr_stis_005.txt')
# convert from ergs s-1 cm-2 A-1 to ergs s-1 m-2 nm-1
vegaflux = vega[:,1]*1.0e5
vega[:,1] = vegaflux
vegalamb = vega[:,0]/10.0 # table has wavelength in angstroms
vega[:,0] = vegalamb
# K band strehl ratios
ircstr = 0.42
ircs = str(ircstr)
olstr = 0.6
ols = str(olstr)
shastr = 0.8
shas = str(shastr)
# Send vega through the telescope
vegairc = si.simIrcal(vega,skymod='cp',df=0.03,odel=0.01,aoT=18.0,sref=ircstr)
vegaout = ss.simshane(vega,skymod='cp',df=0.03,odel=0.01,aoT=18.0)
# Numbers for old laser system - only 8x8 subapertures
vegamos = ss.simshane(vega,skymod='cp',df=0.03,odel=0.01,subaps=8,aoT=18.0)
#vegamos = ss.simshane(vega,skymod='cp',df=0.03,odel=0.01,aoT=18.0,filts='mos')
# magnitude range
mags = np.arange(15.0, 25.5, 0.5)
# exposure time array mags (rows) x filters (columns)
exptarr = np.zeros((mags.size, vegaout['filter'].size), np.float)
snrarr = np.zeros((mags.size, vegaout['filter'].size), np.float)
iexptarr = np.zeros((mags.size, vegairc['filter'].size), np.float)
isnrarr = np.zeros((mags.size, vegairc['filter'].size), np.float)
mexptarr = np.zeros((mags.size, vegamos['filter'].size), np.float)
msnrarr = np.zeros((mags.size, vegamos['filter'].size), np.float)
sn = 5.0
ft = 300.0 # fowler time in secs
for j, f in enumerate(vegaout['filter']):
# ef = open('tables/sharcexpt'+f+'.txt.'+shas, 'w')
# sf = open('tables/sharcsnr' +f+'.txt.'+shas, 'w')
# ief = open('tables/ircalexpt'+f+'.txt.'+ircs, 'w')
# isf = open('tables/ircalsnr' +f+'.txt.'+ircs, 'w')
# oef = open('tables/sholexpt'+f+'.txt.'+ols, 'w')
# osf = open('tables/sholsnr' +f+'.txt.'+ols, 'w')
# mef = open('tables/mosfexpt'+f+'.txt.'+shas, 'w')
# msf = open('tables/mossnr' +f+'.txt.'+shas, 'w')
# ef.write('\multicolumn{{4}}{{|l|}}{{{0} filter}}\\\\\n'.format(f))
# ef.write('\hline\n')
# sf.write('\multicolumn{{4}}{{|l|}}{{{0} filter}}\\\\\n'.format(f))
# sf.write('\hline\n')
for i, m in enumerate(mags):
# m - 0 = -2.5 log (Rstar/Rvega)
# Star photons s-1 in psf coer given magnitude
Rstar = vegaout['Rsrc'][j] * 10**(-m/2.5)
iRstar = vegairc['Rsrc'][j] * 10**(-m/2.5)
mRstar = vegamos['Rsrc'][j] * 10**(-m/2.5)
# Sky photons s-1 in diffraction limited core for filter
Rsky = vegaout['Rsky'][j]
iRsky = vegairc['Rsky'][j]
mRsky = vegamos['Rsky'][j]
# Solve the SNR quadratic equation for t
exptarr[i,j] = ((sn**2*(Rstar + Rsky) +
np.sqrt(sn**4*(Rstar + Rsky)**2 +
4*sn**2*Rstar**2*vegaout['RN2n'][j]))
/(2*Rstar**2))
# ef.write('{0:.1f} & {1:.3e} & {2:.3e} & {3:.3e} & {4:.3e}\\\\\n'.format(m, exptarr[i,j], Rstar*exptarr[i,j], Rsky*exptarr[i,j], vegaout['RN2n'][j]))
# ef.write('\hline\n')
iexptarr[i,j]= ((sn**2*(iRstar + iRsky) +
np.sqrt(sn**4*(iRstar + iRsky)**2 +
4*sn**2*iRstar**2*vegairc['RN2n'][j]))
/(2*iRstar**2))
# ief.write('{0:.1f} & {1:.3e} & {2:.3e} & {3:.3e} & {4:.3e}\\\\\n'.format(m, iexptarr[i,j], iRstar*iexptarr[i,j], iRsky*iexptarr[i,j], vegairc['RN2n'][j]))
# ief.write('\hline\n')
mexptarr[i,j]= ((sn**2*(mRstar + mRsky) +
np.sqrt(sn**4*(mRstar + mRsky)**2 +
4*sn**2*mRstar**2*vegamos['RN2n'][j]))
/(2*mRstar**2))
# mef.write('{0:.1f} & {1:.3e} & {2:.3e} & {3:.3e} & {4:.3e}\\\\\n'.format(m, mexptarr[i,j], mRstar*mexptarr[i,j], mRsky*mexptarr[i,j], vegamos['RN2n'][j]))
# mef.write('\hline\n')
snrarr[i,j] = ((Rstar*ft)/
np.sqrt(Rstar*ft + Rsky*ft + vegaout['RN2n'][j]))
# sf.write('{0:.1f} & {1:.2f} & {2:.3e} & {3:.3e} & {4:.3e}\\\\\n'.format(m, snrarr[i,j], Rstar*ft, Rsky*ft,vegaout['RN2n'][j] ))
# sf.write('\hline\n')
isnrarr[i,j]= ((iRstar*ft)/
np.sqrt(iRstar*ft + iRsky*ft + vegairc['RN2n'][j]))
# isf.write('{0:.1f} & {1:.2f} & {2:.3e} & {3:.3e} & {4:.3e}\\\\\n'.format(m, isnrarr[i,j], iRstar*ft, iRsky*ft,vegairc['RN2n'][j] ))
# isf.write('\hline\n')
msnrarr[i,j]= ((mRstar*ft)/
np.sqrt(mRstar*ft + mRsky*ft + vegamos['RN2n'][j]))
# msf.write('{0:.1f} & {1:.2f} & {2:.3e} & {3:.3e} & {4:.3e}\\\\\n'.format(m, msnrarr[i,j], mRstar*ft, mRsky*ft,vegamos['RN2n'][j] ))
# msf.write('\hline\n')
# ef.close()
# sf.close()
# ief.close()
# isf.close()
# mef.close()
# msf.close()
#lines = ["-","--","-.",":"]
lstyles = ['r-', 'b-', 'g-', 'c-']
lstylei = ['r--', 'b--', 'g--', 'c--']
lstylem = ['r-.', 'b-.', 'g-.', 'c-.']
#linecycler = cycle(lines)
mp.clf()
mp.yscale('log')
mp.ylim(1e-2, 1e9)
mp.grid(True)
mp.title('Exposure time vs. Magnitude')
mp.xlabel('Magnitude (Vega system)')
mp.ylabel('Exposure time (s)')
sj, = mp.plot(mags, exptarr[:,3], lstyles[3])
sh, = mp.plot(mags, exptarr[:,1], lstyles[1])
sk, = mp.plot(mags, exptarr[:,2], lstyles[2])
sks, = mp.plot(mags, exptarr[:,0], lstyles[0])
ij, = mp.plot(mags, iexptarr[:,3], lstylei[3])
ih, = mp.plot(mags, iexptarr[:,1], lstylei[1])
ik, = mp.plot(mags, iexptarr[:,2], lstylei[2])
iks, = mp.plot(mags, iexptarr[:,0], lstylei[0])
mj, = mp.plot(mags, mexptarr[:,3], lstylem[3])
mh, = mp.plot(mags, mexptarr[:,1], lstylem[1])
mk, = mp.plot(mags, mexptarr[:,2], lstylem[2])
mks, = mp.plot(mags, mexptarr[:,0], lstylem[0])
mp.plot([14,26],[300,300],'--')
mp.text(np.min(mags)+0.1, 350, '300s Fowler')
mp.text(np.min(mags)+0.1, 150, 'Exposure')
leg1 = mp.legend([sj,sh,sk,sks],['J','H','K','Ks'], loc='upper left', title='ShARCS 16')
leg2 = mp.legend([mj,mh,mk,mks],['J','H','K','Ks'], loc='upper center', title='ShARCS 8')
mp.legend([ij,ih,ik,iks],['J','H','K','Ks'], loc='lower right', title='IRCAL')
mp.gca().add_artist(leg1)
mp.gca().add_artist(leg2)
#mp.savefig('figs/exptVmag-ircsha.'+ircs+'.png')
mp.savefig('figs/web/exptVmag-ircsha.png')
#mp.show()
mp.clf()
mp.yscale('log')
mp.grid(True)
mp.title('SNR vs. Magnitude')
mp.xlabel('Magnitude (Vega system)')
mp.ylabel('SNR')
sj, = mp.plot(mags, snrarr[:,3], lstyles[3])
sh, = mp.plot(mags, snrarr[:,1], lstyles[1])
sk, = mp.plot(mags, snrarr[:,2], lstyles[2])
sks, = mp.plot(mags, snrarr[:,0], lstyles[0])
ij, = mp.plot(mags, isnrarr[:,3], lstylei[3])
ih, = mp.plot(mags, isnrarr[:,1], lstylei[1])
ik, = mp.plot(mags, isnrarr[:,2], lstylei[2])
iks, = mp.plot(mags, isnrarr[:,0], lstylei[0])
mj, = mp.plot(mags, msnrarr[:,3], lstylem[3])
mh, = mp.plot(mags, msnrarr[:,1], lstylem[1])
mk, = mp.plot(mags, msnrarr[:,2], lstylem[2])
mks, = mp.plot(mags, msnrarr[:,0], lstylem[0])
mp.plot([14,26],[5,5],'--')
mp.text(np.min(mags)+0.1, 6, 'SNR=5')
leg1 = mp.legend([sj,sh,sk,sks],['J','H','K','Ks'], loc='lower left', title='ShARCS 16')
leg2 = mp.legend([mj,mh,mk,mks],['J','H','K','Ks'], loc='lower center', title='ShARCS 8')
mp.legend([ij,ih,ik,iks],['J','H','K','Ks'], loc='upper right', title='IRCAL')
mp.gca().add_artist(leg1)
mp.gca().add_artist(leg2)
#mp.savefig('figs/snrVmag-ircshamos'+ircs+'.png')
mp.savefig('figs/web/snrVmag-ircsha.png')
#mp.show()