Vol.23, NO.5, 2012
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Article Navigation >  Journal of Applied Meteorological Science  > 2012  >  23(5): 585-592
Yang Yun, Ding Lei, Cheng Xinghong, et al. Thermal offset correction methods for sensitivity of PSP pyranometer. J Appl Meteor Sci, 2012, 23(5): 585-592.
Citation: Yang Yun, Ding Lei, Cheng Xinghong, et al. Thermal offset correction methods for sensitivity of PSP pyranometer. J Appl Meteor Sci, 2012, 23(5): 585-592.
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Thermal Offset Correction Methods for Sensitivity of PSP Pyranometer

  • 1.

    Meteorological Observation Center, CMA, Beijing 100081

  • 2.

    Public Weather Service Center, CMA, Beijing 100081

  • 3.

    Nanjing University of Information Science & Technology, Nanjing 210044

  • Received Date: 2012-01-25
  • Rev Recd Date: 2012-06-21
  • Publish Date: 2012-10-31
    Abstract
  • The PSP pyranometer is used as a reference pyranometer and a reliable in strument in China. Before 2006 it is once used as national diffused reference to measure the reference diffused irradiance, the value of which is used in the sum composition method to calculate the reference global irradiance. The probability distribution of the nighttime thermal offsets within the pyranometers demonstrates near normal distribution. The offset of PSP type pyranometers is larger than that of 8-48 and CMP22 type. Finding the characteristics of the offset within different types of pyranometers and doing the calibration will improve the accuracy of diffused irradiance. The pyranometer calibration is done underclear sky. The negative thermal offset of the pyranometer causes that the sensitivity is underestimated. By the experiment and study on the thermal offset correction method for different type pyranometer, five correction methods are compared. The net longwave sensitivity method: Calculating the net longwave sensitivity of the pyranometer using longwave blackbody radiation, which is used in the sum composition method outdoors to correct the thermal offset of the pyranometer to reduce the offset effects. The differential algorithm with the reference global irradiance: Comparing it with the reference value derived from the sum composition method using the absolute cavity radiometer and CMP22 type secondary standard pyranometer with shading. The net longwave equation method: Analyzing the data of pyranometers and PIR type pyrgeometers measured at night to correct thermal offset. The cover method: Covering the dome of pyranometers in daytime to measure the offset of pyranometer directly. Using the voltage output of pyranometer in the nighttime as the thermal offset: Calculating the average voltage (night) when solar is 7° lower than horizon and transform it to irradiance as the thermal offset. When using the sum composition method to calibrate PSP pyranometer, the correction results of the net longwave sensitivity method is better than other methods. The result of the cover method is more close to the net longwave sensitivity method, the correction effects using the night voltage output method is not good. Drawing the daytime offset curves separately using the five offset correction methods, the net longwave equation method and the net longwave sensitivity method is more close to the reference value. But these methods are only confined to the shaded pyranometers, because shading makes pyranometer performs more like in the night. For unshading pyranometers, because of the effects of direct irradiance, the five correction methods are distinctly different with the true value. When using CMP22 and 8-48 pyranometers with shading in the sum composition method to test the reference diffused irradiance, the thermal offset could be ignored. But the CMP22 or 8-48 pyranometer should be calibrated by "shade/unshade" method to reduce the effects of offset for sensitivity.When the net longwave sensitivity method or the cover method is used in the sum composition method, the accuracy of PSP's sensitivity could be improved 1%.
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    References(19)

  • Fig. 1  Difference between measurement of pyranometer and reference global irradiance

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    Fig. 2  Thermal offset equation at night on 16 Oct 2011

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    Fig. 3  Daytime thermal offset curves calculating from thermal offset equation at night

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    Fig. 4  PSP pyranometer zero offset curve at night

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    Fig. 5  Daytime thermal offset curves of unshaded PSP pyranometer using five methods

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    Fig. 6  Daytime thermal offset curves of shaded PSP pyranometer using five methods

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    Table  1  Thermal offset comparison of pyranometer from various methods (unit:W·m-2)

    表号 型号 方法1 方法2 方法3 方法4 方法5
    20462F3 PSP -7.4 -10.5 -4.8 -3.3
    20463F3 PSP -7.8 -14.3 -4.3 -3.0
    33734F3 PSP -5.4 -11.6 -6.7 -8.1 -2.7
    33779 8-48 -1.4 3.3 -0.3
    060016 CMP22 -0.2 -2.2 -1.2
    100180 CMP22 -2.1 -1.0 -1.0
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    Table  2  Comparison of shade/unshade method to sum composition method corrected by RNET

    表号 型号 RUCS/(μV·W-1·m2) RCCS/(μV·W-1·m2) RSU/(μV·W-1·m2) 百分比误差/%
    RUCS RCCS
    20462 PSP 10.07 10.15 10.21 -1.4 -0.6
    20463 PSP 9.50 9.58 9.68 -1.9 -1.0
    33734 PSP 7.89 7.98 8.07 -2.2 -1.1
    注：RUCS为未修正的成分和法得到的灵敏度；RCCS为热偏移修正后的成分和法得到的灵敏度；RSU为“遮/不遮”法得到的灵敏度。下同。
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    Table  3  Comparison of 33734F3 sensitivity using three methods

    时间 太阳天
    顶角/(°)    		 净热辐射
    /(W·m-2)    		 RUCS/
    (μV·W-1·m2)    		 RCCS/
    (μV·W-1·m2)    		 RSU/
    (μV·W-1·m2)    		 百分比误差/%
    RUCS RCCS
    11:27:32 58.6 -137.8 7.77 7.91 7.97 -2.5 -0.8
    11:33:32 58.5 -134.5 7.78 7.91 7.97 -2.4 -0.7
    11:39:32 58.4 -135.2 7.79 7.92 7.98 -2.3 -0.7
    11:45:32 58.3 -135.3 7.79 7.92 7.98 -2.4 -0.7
    11:51:32 58.3 -136.5 7.79 7.92 7.98 -2.4 -0.7
    11:57:32 58.3 -135.6 7.77 7.91 7.98 -2.6 -0.9
    12:03:32 58.3 -136.2 7.78 7.92 8.00 -2.7 -1.0
    12:09:32 58.3 -137.0 7.77 7.90 7.98 -2.7 -1.0
    12:15:32 58.4 -136.2 7.76 7.90 8.00 -2.9 -1.2
    12:21:32 58.6 -136.0 7.76 7.89 7.99 -2.9 -1.2
    12:27:32 58.7 -136.2 7.76 7.89 8.00 -3.0 -1.3
    12:33:32 58.9 -139.3 7.77 7.91 8.00 -2.8 -1.1
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    Table  4  Comparison of shade/unshade method to sum composition method corrected by ENIR equation

    表号 型号 RUCS/(μV·W-1·m2) RCCS/(μV·W-1·m2) RSU/(μV·W-1·m2) 百分比误差/%
    RUCS RCCS
    20462 PSP 10.07 10.14 10.21 -1.4 -0.7
    20463 PSP 9.50 9.56 9.68 -1.9 -1.3
    33734 PSP 7.89 7.94 8.07 -2.2 -1.6
    36176 8-48 9.54 9.55 9.58 -0.5 -0.3
    100180 CMP22 9.34 9.37 9.38 -0.4 -0.1
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    Table  5  Comparison of shade/unshade method to sum composition method corrected by cap-offset

    表号 型号 RUCS/(μV·W-1·m2) RCCS/(μV·W-1·m2) RSU/(μV·W-1·m2) 百分比误差/%
    RUCS RCCS
    33734 PSP 7.89 7.98 8.07 -2.2 -1.2
    100180 CMP22 9.34 9.36 9.38 -0.4 -0.2
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    Table  6  Comparison of shade/unshade method to sum composition method corrected by average of zero offset at night

    表号 型号 RUCS/(μV·W-1·m2) RCCS/(μV·W-1·m2) RSU/(μV·W-1·m2) 百分比误差/%
    RUCS RCCS
    20462 PSP 10.07 10.10 10.21 -1.4 -1.1
    20463 PSP 9.50 9.52 9.68 -1.9 -1.7
    33734 PSP 7.89 7.91 8.07 -2.2 -2.0
    36176 8-48 9.54 9.53 9.58 -0.5 -0.5
    100180 CMP22 9.34 9.35 9.38 -0.4 -0.3
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    • Received : 2012-01-25
    • Accepted : 2012-06-21
    • Published : 2012-10-31
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