The irradiances of 37 spectral lines emitted by mercury pencil-type lamps were
measured by comparison with calibrated continuum sources. The lines span the
region 230–590 nm. For the 14 most prominent lines the absolute irradiances
should be useful for radiometric calibrations at an uncertainty level of ∼15%
(95% confidence). The ratios of the irradiances for this same group of lines are
significantly more reproducible; they should be useful at an uncertainty level
of ∼10%.
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Entries in bold italic represent the primary group of lines for which
more extensive measurements and aging tests were made. The uncertainties
represent a 95% level of confidence.
Irradiance for this line was determined from the irradiance at 436 nm by
use of the ratio given in Table
3.
Combined irradiance for the group of four lines at 280 nm.
These adjacent lines were not resolved in the irradiance measurements.
The irradiance was divided among the lines based on their observed
ratios in higher-resolution scans.
The irradiance of only the strongest of these adjacent lines was measured
directly. The irradiance of the other lines was determined from their
observed ratios to the strongest line in high-resolution scans.
Table 3
Ratios of Irradiances of Selected Lines of Hg Pencil Lamps to Irradiance
at 436 nm
Entries in bold italic type represent the group of primary lines for
which more extensive measurements and aging tests were made. The
uncertainties represent a 95% level of confidence.
The ratio for this line was determined from only one observation per
lamp.
Ratio for the combined irradiance for the group of four lines at 280
nm.
These adjacent lines were not resolved in the irradiance measurements.
The irradiance was divided among the lines based on their observed
ratios in higher-resolution scans.
The irradiance of only the strongest of these adjacent lines was measured
directly. The irradiance of the other lines was determined from their
observed ratios to the strongest line in high-resolution scans.
Table 4
Change in Irradiance for Selected Hg Lines in Lamp 1 when the Ambient
Temperature Was Raised from 23 to 31°C
Wavelength
(nm)
Irradiance
Change from 23 °C (%)
253.6521
−22.0
289.3601
3.7
296.7283
3.7
312.5674
5.3
365.0158
2.3
404.6565
1.6
407.7837
11.7
435.8335
−2.8
546.0750
−2.7
576.9610
5.0
579.0670
6.1
Tables (4)
Table 1
Irradiances at a Distance of 250 mm Measured at 436 nm in Different Hg
Pencil Lamps
Lamp No.
Irradiance
(10−6 W cm−2)
1
2.47
1
2.55
1
2.48
1
2.62
2
2.83
2
2.61
3
2.69
3
2.63
4
2.73
4
2.49
4
2.65
4
2.50
4
2.50
4
2.49
4
2.47
4
2.48
4
2.80
5
2.83
5
2.48
5
2.67
5
2.50
5
2.48
5
2.44
5
2.44
5
2.44
5
2.30
5
2.26
6
2.64
6
2.49
Table 2
Irradiances of Selected Lines of Hg Pencil Lamps at a Distance of 250 mma
Entries in bold italic represent the primary group of lines for which
more extensive measurements and aging tests were made. The uncertainties
represent a 95% level of confidence.
Irradiance for this line was determined from the irradiance at 436 nm by
use of the ratio given in Table
3.
Combined irradiance for the group of four lines at 280 nm.
These adjacent lines were not resolved in the irradiance measurements.
The irradiance was divided among the lines based on their observed
ratios in higher-resolution scans.
The irradiance of only the strongest of these adjacent lines was measured
directly. The irradiance of the other lines was determined from their
observed ratios to the strongest line in high-resolution scans.
Table 3
Ratios of Irradiances of Selected Lines of Hg Pencil Lamps to Irradiance
at 436 nm
Entries in bold italic type represent the group of primary lines for
which more extensive measurements and aging tests were made. The
uncertainties represent a 95% level of confidence.
The ratio for this line was determined from only one observation per
lamp.
Ratio for the combined irradiance for the group of four lines at 280
nm.
These adjacent lines were not resolved in the irradiance measurements.
The irradiance was divided among the lines based on their observed
ratios in higher-resolution scans.
The irradiance of only the strongest of these adjacent lines was measured
directly. The irradiance of the other lines was determined from their
observed ratios to the strongest line in high-resolution scans.
Table 4
Change in Irradiance for Selected Hg Lines in Lamp 1 when the Ambient
Temperature Was Raised from 23 to 31°C
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