Mercurial > public > atmospheric_lidar_ghk / file comparison
comparison: system_settings/optic_input_example_lidar.py
system_settings/optic_input_example_lidar.py
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| 1 # This Python script will be executed from within the main lidar_correction_ghk.py | |
| 2 # Probably it will be better in the future to let the main script rather read a conguration file, | |
| 3 # which might improve the portability of the code within an executable. | |
| 4 # Due to problems I had with some two letter variables, most variables are now with at least | |
| 5 # three letters mixed small and capital. | |
| 6 # Error calculation? | |
| 7 # False: only calculate the GHK-parameters. True: calculate also errors. Can take a long time. | |
| 8 Error_Calc = True | |
| 9 | |
| 10 # Header to identify the lidar system | |
| 11 # | |
| 12 EID = "xx" # Earlinet station ID | |
| 13 LID = "example lidar" # Additional lidar ID (short descriptive text) | |
| 14 print(" Lidar system :", EID, ", ", LID) | |
| 15 | |
| 16 # +++ IL Laser beam polarisation and +-Uncertainty | |
| 17 DOLP, dDOLP, nDOLP = 0.995, 0.005, 1 #degree of linear polarization; default 1 | |
| 18 RotL, dRotL, nRotL = 0., 2., 1 #alpha; rotation of laser polarization in degrees; default 0 | |
| 19 | |
| 20 # +++ ME Emitter optics and +-Uncertainty; default = no emitter optics | |
| 21 DiE, dDiE, nDiE = 0.0, 0.1, 0 # Diattenuation; default 0 | |
| 22 TiE = 1.0 # Unpolarized transmittance; default 1 | |
| 23 RetE, dRetE, nRetE = 0., 180., 0 # Retardance in degrees; default 0 | |
| 24 RotE, dRotE, nRotE = 0., 1., 0 # beta: Rotation of optical element in degrees; default 0 | |
| 25 | |
| 26 # +++ MO Receiver optics including telescope | |
| 27 DiO, dDiO, nDiO = 0.0, 0.2, 1 # Diattenuation; default 0 | |
| 28 TiO = 1.0 # Unpolarized transmittance; default 1 | |
| 29 RetO, dRetO, nRetO = 0., 180., 0 # Retardance in degrees; default 0 | |
| 30 RotO, dRotO, nRotO = 0., 0.1, 0 #gamma: Rotation of the optical element in degrees; default 0 | |
| 31 | |
| 32 # +++++ PBS MT Transmitting path defined with TS, TP, PolFilter extinction ratio ERaT, and +-Uncertainty | |
| 33 # --- Polarizing beam splitter transmitting path | |
| 34 TP, dTP, nTP = 0.95, 0.01, 1 # transmittance of the PBS for parallel polarized light | |
| 35 TS, dTS, nTS = 0.005, 0.001, 1 # transmittance of the PBS for cross polarized light | |
| 36 RetT, dRetT, nRetT = 0.0, 180., 0 # Retardance in degrees | |
| 37 # --- Pol.Filter behind transmitted path of PBS | |
| 38 ERaT, dERaT, nERaT = 0.001, 0.001, 0 # Extinction ratio | |
| 39 RotaT, dRotaT, nRotaT = 0., 1., 0 # Rotation of the Pol.-filter in degrees; usually close to 0° because TP >> TS, but for PollyXTs it can also be close to 90° | |
| 40 # -- | |
| 41 TiT = 0.5 * (TP + TS) # do not change this | |
| 42 DiT = (TP-TS)/(TP+TS) # do not change this | |
| 43 DaT = (1-ERaT)/(1+ERaT) # do not change this | |
| 44 TaT = 0.5*(1+ERaT) # do not change this | |
| 45 | |
| 46 # +++++ PBS MR Reflecting path defined with RS, RP, and cleaning PolFilter extinction ratio ERaR and +-Uncertainty | |
| 47 # ---- for PBS without absorption the change of RS and RP must depend on the change of TP and TS. Hence the values and uncertainties are not independent. | |
| 48 RS_RP_depend_on_TS_TP = True | |
| 49 # --- Polarizing beam splitter reflecting path | |
| 50 if(RS_RP_depend_on_TS_TP): | |
| 51 RP, dRP, nRP = 1-TP, 0.00, 0 # do not change this | |
| 52 RS, dRS, nRS = 1-TS, 0.00, 0 # do not change this | |
| 53 else: | |
| 54 RP, dRP, nRP = 0.05, 0.01, 1 # change this if RS_RP_depend_on_TS_TP = False; reflectance of the PBS for parallel polarized light | |
| 55 RS, dRS, nRS = 0.98, 0.01, 1 # change this if RS_RP_depend_on_TS_TP = False; reflectance of the PBS for cross polarized light | |
| 56 RetR, dRetR, nRetR = 0.0, 180., 0 # Retardance in degrees | |
| 57 # --- Pol.Filter behind reflected path of PBS | |
| 58 ERaR, dERaR, nERaR = 0.001, 0.001, 1 # Extinction ratio | |
| 59 RotaR, dRotaR, nRotaR = 90., 1., 1 # Rotation of the Pol.-filter in degrees; usually 90° because RS >> RP, but for PollyXTs it can also be 0° | |
| 60 # -- | |
| 61 TiR = 0.5 * (RP + RS) # do not change this | |
| 62 DiR = (RP-RS)/(RP+RS) # do not change this | |
| 63 DaR = (1-ERaR)/(1+ERaR) # do not change this | |
| 64 TaR = 0.5*(1+ERaR) # do not change this | |
| 65 # NEW --- Additional ND filter transmission (attenuation) during the calibration | |
| 66 TCalT, dTCalT, nTCalT = 1, 0.01, 0 # transmitting path, default 1, 0, 0 | |
| 67 TCalR, dTCalR, nTCalR = 0.1, 0.001, 1 # reflecting path, default 1, 0, 0 | |
| 68 | |
| 69 # +++ Orientation of the PBS with respect to the reference plane (see Improvements_of_lidar_correction_ghk_ver.0.9.8_190124.pdf) | |
| 70 # Y = +1: polarisation in reference plane is finally transmitted, | |
| 71 # Y = -1: polarisation in reference plane is finally reflected. | |
| 72 Y = +1. | |
| 73 | |
| 74 # +++ Calibrator | |
| 75 | |
| 76 # --- Calibrator Type used; defined by matrix values below | |
| 77 TypeC = 3 #Type of calibrator: 1 = mechanical rotator; 2 = hwp rotator (fixed retardation); 3 = linear polarizer; 4 = qwp; 5 = circular polarizer; 6 = real HWP calibration +-22.5° | |
| 78 | |
| 79 # --- Calibrator Location | |
| 80 LocC = 3 #location of calibrator: 1 = behind laser; 2 = behind emitter; 3 = before receiver; 4 = before PBS | |
| 81 # --- MC Calibrator parameters | |
| 82 if TypeC == 1: #mechanical rotator | |
| 83 DiC, dDiC, nDiC = 0., 0., 0 # Diattenuation | |
| 84 TiC = 1. | |
| 85 RetC, dRetC, nRetC = 0., 0., 0 # Retardance in degrees | |
| 86 RotC, dRotC, nRotC = 0., 0.1, 1 #constant calibrator rotation offset epsilon | |
| 87 # Rotation error without calibrator: if False, then epsilon = 0 for normal measurements | |
| 88 RotationErrorEpsilonForNormalMeasurements = True # is in general True for TypeC == 1 calibrator | |
| 89 elif TypeC == 2: # HWP simulated by rotator without retardance! | |
| 90 DiC, dDiC, nDiC = 0., 0., 0 # Diattenuation; ideal 0.0 | |
| 91 TiC = 1. | |
| 92 RetC, dRetC, nRetC = 180., 0., 0 # Retardance in degrees | |
| 93 #NOTE: use here twice the HWP-rotation-angle | |
| 94 RotC, dRotC, nRotC = 0.0, 0.1, 1 #constant calibrator rotation offset epsilon | |
| 95 RotationErrorEpsilonForNormalMeasurements = True # is in general True for TypeC == 2 calibrator | |
| 96 elif TypeC == 3: # linear polarizer calibrator. Diattenuation DiC = (1-ERC)/(1+ERC); ERC = extinction ratio of calibrator | |
| 97 DiC, dDiC, nDiC = 0.9998, 0.00019, 1 # Diattenuation; ideal 1.0 | |
| 98 TiC = 0.4 # ideal 0.5 | |
| 99 RetC, dRetC, nRetC = 0., 180., 3 # Retardance in degrees | |
| 100 RotC, dRotC, nRotC = 0.0, 0.1, 0 #constant calibrator rotation offset epsilon | |
| 101 RotationErrorEpsilonForNormalMeasurements = False # is in general False for TypeC == 3 calibrator | |
| 102 elif TypeC == 4: # QWP calibrator | |
| 103 DiC, dDiC, nDiC = 0.0, 0., 0 # Diattenuation; ideal 0.0 | |
| 104 TiC = 1.0 # ideal 0.5 | |
| 105 RetC, dRetC, nRetC = 90., 0., 0 # Retardance in degrees | |
| 106 RotC, dRotC, nRotC = 0.0, 0.1, 1 #constant calibrator rotation offset epsilon | |
| 107 RotationErrorEpsilonForNormalMeasurements = False # is False for TypeC == 4 calibrator | |
| 108 elif TypeC == 6: # real half-wave plate rotator calibration at +-22.5° => rotated_diattenuator_X22x5deg.odt | |
| 109 DiC, dDiC, nDiC = 0., 0., 0 # Diattenuation; ideal 0.0 | |
| 110 TiC = 1. | |
| 111 RetC, dRetC, nRetC = 180., 0., 0 # Retardance in degrees | |
| 112 #Note: use real HWP angles here | |
| 113 RotC, dRotC, nRotC = 0.0, 0.1, 1 #constant calibrator rotation offset epsilon | |
| 114 RotationErrorEpsilonForNormalMeasurements = True # is in general True for TypeC == 6 calibrator | |
| 115 else: | |
| 116 print ('calibrator not implemented yet') | |
| 117 sys.exit() | |
| 118 | |
| 119 # --- LDRCal assumed atmospheric linear depolarization ratio during the calibration measurements in calibration range with almost clean air (first guess) | |
| 120 LDRCal,dLDRCal,nLDRCal= 0.2, 0.15, 1 # spans most of the atmospheric depolarisation variability | |
| 121 # LDRCal,dLDRCal,nLDRCal= 0.009, 0.005, 1 # spans the interference filter influence | |
| 122 | |
| 123 # ==================================================== | |
| 124 # NOTE: there is no need to change anything below. | |
| 125 # ==================================================== | |
| 126 # !!! don't change anything in this section !!! | |
| 127 # NEW *** | |
| 128 bPlotEtax = False # plot error histogramms for Etax | |
| 129 | |
| 130 # *** Only for signal noise errors *** | |
| 131 nNCal = 0 # error nNCal, calibration signals: one-sigma in steps to left and right | |
| 132 nNI = 0 # error nNI, 0° signals: one-sigma in steps to left and right; NI signals are calculated from NCalT and NCalR in main programm, but noise is assumed to be independent. | |
| 133 | |
| 134 # --- number of photon counts in the signal summed up in the calibration range during the calibration measurements | |
| 135 NCalT = 28184 # default 1e6, assumed the same in +45° and -45° signals | |
| 136 NCalR = 28184 # default 1e6, assumed the same in +45° and -45° signals | |
| 137 NILfac = 2 # (relative duration (laser shots) of standard (0°) measurement to calibration measurements) * (range of std. meas. smoothing / calibration range); example: 100000#/5000# * 100/1000 = 2 | |
| 138 # LDRmeas below will be used to calculate IR and IT of 0° signals. | |
| 139 # calculate signal counts only from parallel 0° signal assuming the same electronic amplification in both channels; overwrites above values | |
| 140 CalcFrom0deg = True | |
| 141 NI = 1e5 #number of photon counts in the parallel 0°-signal | |
| 142 | |
| 143 if(CalcFrom0deg): | |
| 144 # either eFactT or eFacR is = 1 => rel. amplification | |
| 145 eFacT = 1 # rel. amplification of transmitted channel, approximate values are sufficient; def. = 1 | |
| 146 eFacR = 10 # rel. amplification of reflected channel, approximate values are sufficient; def. = 1 | |
| 147 NILfac = 2 # (relative duration (laser shots) of standard (0°) measurement to calibration measurements) * (range of std. meas. smoothing / calibration range); example: 100000#/5000# * 100/1000 = 2 | |
| 148 | |
| 149 NCalT = NI / NILfac * TCalT * eFacT # photon counts in transmitted signal during calibration | |
| 150 NCalR = NI / NILfac * TCalR * eFacR # photon counts in reflected signal during calibration | |
| 151 # LDRmeas below will be used to calculate IR and IT of 0° signals. | |
| 152 # NEW *** End of signal noise error parameters *** | |
| 153 | |
| 154 | |
| 155 # --- LDRtrue for simulation of measurement => LDRsim | |
| 156 LDRtrue = 0.4 | |
| 157 LDRtrue2 = 0.004 | |
| 158 | |
| 159 # --- measured LDRm will be corrected with calculated parameters GHK | |
| 160 LDRmeas = 0.3 | |
| 161 | |
| 162 # --- this is just for correct transfer of the variables to the main file | |
| 163 DOLP0, dDOLP, nDOLP = DOLP, dDOLP, nDOLP | |
| 164 RotL0, dRotL, nRotL = RotL, dRotL, nRotL | |
| 165 # Emitter | |
| 166 DiE0, dDiE, nDiE = DiE, dDiE, nDiE | |
| 167 RetE0, dRetE, nRetE = RetE, dRetE, nRetE | |
| 168 RotE0, dRotE, nRotE = RotE, dRotE, nRotE | |
| 169 # Receiver | |
| 170 DiO0, dDiO, nDiO = DiO, dDiO, nDiO | |
| 171 RetO0, dRetO, nRetO = RetO, dRetO, nRetO | |
| 172 RotO0, dRotO, nRotO = RotO, dRotO, nRotO | |
| 173 # Calibrator | |
| 174 DiC0, dDiC, nDiC = DiC, dDiC, nDiC | |
| 175 RetC0, dRetC, nRetC = RetC, dRetC, nRetC | |
| 176 RotC0, dRotC, nRotC = RotC, dRotC, nRotC | |
| 177 # PBS | |
| 178 TP0, dTP, nTP = TP, dTP, nTP | |
| 179 TS0, dTS, nTS = TS, dTS, nTS | |
| 180 RetT0, dRetT, nRetT = RetT, dRetT, nRetT | |
| 181 | |
| 182 ERaT0, dERaT, nERaT = ERaT, dERaT, nERaT | |
| 183 RotaT0,dRotaT,nRotaT= RotaT,dRotaT,nRotaT | |
| 184 | |
| 185 RP0, dRP, nRP = RP, dRP, nRP | |
| 186 RS0, dRS, nRS = RS, dRS, nRS | |
| 187 RetR0, dRetR, nRetR = RetR, dRetR, nRetR | |
| 188 | |
| 189 ERaR0, dERaR, nERaR = ERaR, dERaR, nERaR | |
| 190 RotaR0,dRotaR,nRotaR= RotaR,dRotaR,nRotaR | |
| 191 | |
| 192 LDRCal0,dLDRCal,nLDRCal=LDRCal,dLDRCal,nLDRCal |
