The earth radiation budget (ERB) experiment is scheduled to be flown aboard the
NIMBUS F satellite that is to be launched in mid-1974. This experiment includes
channels, to measure solar radiation, earth-reflected radiation (albedo), and
earth-emitted long-wave radiation. The calibration techniques and the standards
employed are included in the topics of this paper. Problems associated with
achieving the desired levels of confidence for a multifaceted, high accuracy
satellite experiment are discussed and some results of preliminary calibrations
are presented.
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Channels 1S and 2S are redundant.
Values of channel operational sensitivities include safety factors for
temperature effects and irradiance uncertainties. 10 V = 2048
bits. Channels 1S through 8S are fitted with N3-type thermopile
detectors; channels, 9S and 10S have type-K2 thermopiles. The
unencumbered field of view for all channels is 10°; the maximum
field is 26° for channels 1S through 8S and 28° for
channels 9S and 10S.
RG695 hemispheres between 2 Suprasil W
hemispheres
0 to 250
0 to 3.2
4.096
0.665
Channels 11E and 12E are redundant channels. All channels have type-N3
thermopile sensors. Field of view of all channels is 121°
unencumbered and 133.3° maximum. Channel 12E has a field-of-view
selection of 89.4° unencumbered, 112.4° maximum.
Table III
Scanning Channel Characteristics
Channel
Wavelength limits
(μm)
Filter
FOV degrees
Responsivity (V/W RMS/RMS)
Noise equivalent radiance (W
cm−2 sr−1)
NEP (W
Hz−1/2)
15–18
0.2–5.0
Suprasil W
0.25 × 5.14
50
3.7 ×
10−5
6.65 ×
10−9
19–22
4.5–50
Deposited layers on diamond substrate
0.25 × 5.14
50
1.8 ×
10−5
1.73 ×
10−9
Table IV
Accuracy and Precision Goals for ERB Sensing Channels
Channels 1S and 2S are redundant.
Values of channel operational sensitivities include safety factors for
temperature effects and irradiance uncertainties. 10 V = 2048
bits. Channels 1S through 8S are fitted with N3-type thermopile
detectors; channels, 9S and 10S have type-K2 thermopiles. The
unencumbered field of view for all channels is 10°; the maximum
field is 26° for channels 1S through 8S and 28° for
channels 9S and 10S.
RG695 hemispheres between 2 Suprasil W
hemispheres
0 to 250
0 to 3.2
4.096
0.665
Channels 11E and 12E are redundant channels. All channels have type-N3
thermopile sensors. Field of view of all channels is 121°
unencumbered and 133.3° maximum. Channel 12E has a field-of-view
selection of 89.4° unencumbered, 112.4° maximum.
Table III
Scanning Channel Characteristics
Channel
Wavelength limits
(μm)
Filter
FOV degrees
Responsivity (V/W RMS/RMS)
Noise equivalent radiance (W
cm−2 sr−1)
NEP (W
Hz−1/2)
15–18
0.2–5.0
Suprasil W
0.25 × 5.14
50
3.7 ×
10−5
6.65 ×
10−9
19–22
4.5–50
Deposited layers on diamond substrate
0.25 × 5.14
50
1.8 ×
10−5
1.73 ×
10−9
Table IV
Accuracy and Precision Goals for ERB Sensing Channels
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