Campbell-scientific CNR4 Net Radiometer Bedienungsanleitung PDF herunterladen (Seite 56)

Appendix B. CNF4 Heater/Ventilator

'CNR4 multipliers

Public cnr4_mult(4)

Const pyranometer_up_mult = 1000/pyranometer_up_sensitivity '(W/m^2/mV)

Const pyranometer_dn_mult = 1000/pyranometer_dn_sensitivity '(W/m^2/mV)

Const pyrgeometer_up_mult = 1000/pyrgeometer_up_sensitivity '(W/m^2/mV)

Const pyrgeometer_dn_mult = 1000/pyrgeometer_dn_sensitivity '(W/m^2/mV)

DataTable (cnr4_data,True,-1)

DataInterval (0,60,Min,10)

CardOut (1,-1)

Minimum (1,batt_volt,FP2,0,False)

Sample (1,logger_temp,FP2)

Average (4,cnr4(1),IEEE4,False)

Average (1,cnr4_T_C,IEEE4,False)

A nr4_verage (1,c T_K,IEEE4,False)

A ong_verage (1,l up_corr,IEEE4,False)

Average (1,long_dn_corr,IEEE4,False)

Average (1,Rs_net,IEEE4,False)

Average (1,Rl_net,IEEE4,False)

Average (1,albedo,IEEE4,False)

Average (1,Rn,IEEE4,False)

EndTable

DataTable (cnr4_ts,True,-1)

DataInterval (0,1,Sec,10)

CardOut (1,-1)

Sample (4,cnr4(1),IEEE4)

Sample (1,cnr4_T_K,IEEE4)

EndTable

BeginProg

'Load the multiplier values for the CNR4

cnr4_mult(1) = pyranometer_up_mult

cnr4_mult(2) = pyranometer_dn_mult

cnr4_mult(3) = pyrgeometer_up_mult

cnr4_mult(4) = pyrgeometer_dn_mult

Scan (1,Sec,3,0)

PanelTemp (logger_temp,250)

Battery (batt_volt)

'CNR4 radiation measurements

VoltDiff (cnr4(),4,mV20C,1,True ,0,_60Hz,cnr4_mult(),0)

'CNR4 thermistor measurement

BrHalf (Vs_Vx,1,mv5000,16,Vx1,1,2500,True ,0,250,1.0,0)

Rs = 1000*(Vs_Vx/(1-Vs_Vx))

cnr4_T_C = 1/(1.0295e-3+2.391e-4*LN(Rs)+1.568e-7*(LN(Rs))^3)-273.15

'Convert CNR4 temperature to Kelvin

cnr4_T_K = cnr4_T_C+273.15

'Correct the long-wave radiation values from pyrgeometers

long_up_corr = long_up+5.67e-8*cnr4_T_K^4

long_dn_corr = long_dn+5.67e-8*cnr4_T_K^4

'Compute short-wave net radiation

Rs_net = short_up - short_dn

'Compute long-wave net radiation

Rl_net = long_up - long_dn

'Compute albedo

albedo = short_dn/short_up

B-10

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