Campbell CVF4 Spécifications télécharger pdf (Page 18)

CNR4 Net Radiometer

TABLE 5-2. Resistance values versus CNR4's Pt-100 temperature in °C.

Temperature

[°C]

Resistance

[Ω]

Temperature

[°C]

Resistance

[Ω]

Temperature

[°C]

Resistance

[Ω]

-30

-29

-28

-27

-26

-25

-24

-23

-22

-21

-20

-19

-18

-17

-16

-15

-14

-13

-12

-11

-10

-9

-8

-7

-6

-5

-4

-3

-2

-1

88.22

88.62

89.01

89.40

89.80

90.19

90.59

90.98

91.37

91.77

92.16

92.55

92.95

93.34

93.73

94.12

94.52

94.91

95.30

95.69

96.09

96.48

96.87

97.26

97.65

98.04

98.44

98.83

99.22

99.61

100.00

100.39

100.78

101.17

101.56

101.95

102.34

102.73

103.12

103.51

103.90

104.29

104.68

105.07

105.46

105.85

106.24

106.63

107.02

107.40

107.79

108.18

108.57

108.96

109.35

109.73

110.12

110.51

110.90

111.28

111.67

112.06

112.45

112.83

113.22

113.61

113.99

114.38

114.77

115.15

115.54

115.93

116.31

116.70

117.08

117.47

117.85

118.24

118.62

119.01

119.40

119.78

120.16

120.55

120.93

121.32

121.70

122.09

122.47

122.86

5.4 Calculation of Albedo

Albedo is the ratio of reflected short-wave radiation to incoming short-wave

radiation. This unitless value ranges between 0 and 1. Typical values are 0.9

for snow, and 0.3 for grassland. To determine the albedo, the measured values

of the two pyranometers can be used. The pyrgeometers are not involved, as

they do not measure short-wave solar radiation. Do not use the measured

values when the solar elevation is lower than 10 degrees above the horizon.

Errors in the measurements at these elevations are likely and yield unreliable

results. This is due to deviations in the directional response of the

pyranometers.

Albedo = (E lower Pyranometer) / (E upper Pyranometer) (5-3)

1 2 ... 13 14 15 16 17 18 19 20 21 22 23 ... 59 60

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