The author is with the Celestial Sensor Group, in the Spacecraft Control Section of the Guidance and Control Division, Jet Propulsion Laboratory, Pasadena, California 91103.
This paper describes a method of performing sensor calibrations using an NBS standard of spectral irradiance. The method shown, among others, was used for calibration of the Mariner IV Canopus sensor. Agreement of inflight response to preflight calibrations performed by this technique has been found to be well within 10%.
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6. Determination of star absolute spectral irradiance
5
7. Absolute reflectance of MgO
4
8. Errors in the NBS bulb other than those caused by erroneous current measurements
5
The maximum possible error based on the sum of all errors, based on the above error sources, equals 26%. The probable error based on the square root of the sum of the squared errors is 11%.
Representative Spectral Distribution (Normalized to Unity at Its Peak) for the NBS Standard of Spectral Irradiancea
Wavelength (μ)
Normalized irradiance
0.25
0.000545
0.26
0.00103
0.27
0.00182
0.28
0.00300
0.29
0.00464
0.30
0.00684
0.31
0.00985
0.32
0.0135
0.33
0.0190
0.34
0.0239
0.35
0.0315
0.36
0.0396
0.37
0.0496
0.38
0.0604
0.39
0.0739
0.40
0.0870
0.41
0.104
0.42
0.119
0.43
0.137
0.44
0.154
0.45
0.175
0.46
0.197
0.47
0.222
0.48
0.243
0.49
0.272
0.50
0.299
0.51
0.325
0.52
0.346
0.53
0.376
0.54
0.404
0.55
0.434
0.56
0.460
0.57
0.490
0.58
0.515
0.59
0.545
0.60
0.572
0.61
0.600
0.62
0.622
0.63
0.649
0.64
0.672
0.65
0.704
0.66
0.724
0.67
0.748
0.68
0.775
0.69
0.798
0.70
0.819
0.71
0.839
0.72
0.858
0.73
0.878
0.74
0.896
0.75
0.906
0.76
0.925
0.77
0.937
0.78
0.946
0.79
0.955
0.80
0.961
0.81
0.975
0.82
0.981
0.83
0.985
0.84
0.988
0.85
0.993
0.86
0.995
0.87
0.997
0.88
0.998
0.89
1.0
0.90
1.0
0.91
1.0
0.92
0.998
0.93
0.997
0.94
0.995
0.95
0.991
0.96
0.988
0.97
0.987
0.98
0.985
0.99
0.982
1.00
0.979
1.01
0.973
1.02
0.966
1.03
0.960
1.04
0.955
1.05
0.952
1.06
0.945
1.07
0.939
1.08
0.931
1.09
0.927
1.10
0.922
This table presents data for NBS Bulb No. 171. Peak output for this bulb was 6.7 × 10−3 W/(cm2μ) at λ = 0.9 μ and D = 43 cm [i.e, K1(D) = 6.7 × 10−3, when D = 43 cm].
Tables (6)
Table I
Estimate of Maximum Error by Two Methods for the Mariner IV Canopus Sensor
6. Determination of star absolute spectral irradiance
5
7. Absolute reflectance of MgO
4
8. Errors in the NBS bulb other than those caused by erroneous current measurements
5
The maximum possible error based on the sum of all errors, based on the above error sources, equals 26%. The probable error based on the square root of the sum of the squared errors is 11%.
Representative Spectral Distribution (Normalized to Unity at Its Peak) for the NBS Standard of Spectral Irradiancea
Wavelength (μ)
Normalized irradiance
0.25
0.000545
0.26
0.00103
0.27
0.00182
0.28
0.00300
0.29
0.00464
0.30
0.00684
0.31
0.00985
0.32
0.0135
0.33
0.0190
0.34
0.0239
0.35
0.0315
0.36
0.0396
0.37
0.0496
0.38
0.0604
0.39
0.0739
0.40
0.0870
0.41
0.104
0.42
0.119
0.43
0.137
0.44
0.154
0.45
0.175
0.46
0.197
0.47
0.222
0.48
0.243
0.49
0.272
0.50
0.299
0.51
0.325
0.52
0.346
0.53
0.376
0.54
0.404
0.55
0.434
0.56
0.460
0.57
0.490
0.58
0.515
0.59
0.545
0.60
0.572
0.61
0.600
0.62
0.622
0.63
0.649
0.64
0.672
0.65
0.704
0.66
0.724
0.67
0.748
0.68
0.775
0.69
0.798
0.70
0.819
0.71
0.839
0.72
0.858
0.73
0.878
0.74
0.896
0.75
0.906
0.76
0.925
0.77
0.937
0.78
0.946
0.79
0.955
0.80
0.961
0.81
0.975
0.82
0.981
0.83
0.985
0.84
0.988
0.85
0.993
0.86
0.995
0.87
0.997
0.88
0.998
0.89
1.0
0.90
1.0
0.91
1.0
0.92
0.998
0.93
0.997
0.94
0.995
0.95
0.991
0.96
0.988
0.97
0.987
0.98
0.985
0.99
0.982
1.00
0.979
1.01
0.973
1.02
0.966
1.03
0.960
1.04
0.955
1.05
0.952
1.06
0.945
1.07
0.939
1.08
0.931
1.09
0.927
1.10
0.922
This table presents data for NBS Bulb No. 171. Peak output for this bulb was 6.7 × 10−3 W/(cm2μ) at λ = 0.9 μ and D = 43 cm [i.e, K1(D) = 6.7 × 10−3, when D = 43 cm].