The theory of Langley method was used to calibrate the four multi-wavelength MICROTOPS Ⅱ sun-photometers at Lingshou in Hebei Province,and good calibration results were obtained by using least square method.Then error analysis was taken from instrument viewing angle,filter bandwidth,weather condition,gas absorption etc.The modified Langley method was adopted to the water vapor channel(936 nm).Finally,calibration results of five channels were calculated for each instrument.In order to verify the effectivenes...
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