Use of a Tungsten Filament Lamp as a Calibration Standard in the Vacuum Ultraviolet

J. L. Buckley

doi:10.1364/AO.10.001114

Applied Optics
Vol. 10,
Issue 5,
pp. 1114-1118
(1971)
•https://doi.org/10.1364/AO.10.001114

Use of a Tungsten Filament Lamp as a Calibration Standard in the Vacuum Ultraviolet

J. L. Buckley

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J. L. Buckley, "Use of a Tungsten Filament Lamp as a Calibration Standard in the Vacuum Ultraviolet," Appl. Opt. 10, 1114-1118 (1971)

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Abstract

A tungsten ribbon filament lamp fitted with a sapphire window and operated at a temperature of 2800 K is shown to be a stable reproducible calibration source over the wavelength range 1500–2700 Å. Spectra of the lamp obtained using a 50-cm Ebert spectrometer and an extreme-solar-blind photomultiplier with pulse-counting electronics are reproducible to better than ±10% over this spectral range. Careful calibration of the spectrometer and photomultiplier has allowed a direct measurement of the absolute spectral radiance of the lamp, hence the apparent emissivity of the hot tungsten filament, from 1500 Å to 2700 Å.

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Wavelength (Å)	Spectrum (counts sec⁻¹)			Average net counts sec⁻¹	Standard deviation of average (%)

	1	2	3
1500	54.6	52.0	52.5	11	10.2
1600	145	140	141	101	2.1
1700	658	650	635	608	1.6
1800	808	800	800	763	0.5
1900	351	351	353	314	0.3
2000	289	287	289	251	0.4
2100	623	630	624	590	0.5
2200	1,665	1,662	1,669	1,630	0.2
2300	2,870	2,740	2,720	2,740	2.4
2400	8,940	8,410	8,320	8,520	3.2
2500	21,120	19,940	19,780	20,250	2.9
2600	31,900	30,500	30,300	30,900	2.3
2700	30,700	29,500	29,500	29,900	1.9
1200	42.9	50.9	41.3	43.9 counts sec⁻¹ avg. background
1300	48.0	44.7	44.5
1400	45.3	44.3	43.8

Wavelength (Å)	Lamp (39.00 A) (photon cm⁻² sec⁻¹ sr⁻¹ Å⁻¹)	Blackbody (2798 K) (photon cm⁻² sec⁻¹ sr⁻¹ Å⁻¹)
1500	4.5 × 10⁵	1.5 × 10⁷
1600	7.1 × 10⁶	1.0 × 10⁸
1700	6.1 × 10⁷	5.2 × 10⁸
1800	3.8 × 10⁸	2.2 × 10⁹
1900	1.8 × 10⁹	8.1 × 10⁹
2000	4.8 × 10⁹	2.6 × 10¹⁰
2100	1.5 × 10¹⁰	7.2 × 10¹⁰
2200	4.5 × 10¹⁰	1.8 × 10¹²
2300	1.1 × 10¹¹	4.2 × 10¹¹
2400	2.7 × 10¹¹	9.0 × 10¹¹
2500	6.7 × 10¹¹	1.8 × 10¹²
2600	1.3 × 10¹²	3.4 × 10¹²
2700	2.7 × 10¹²	6.0 × 10¹²

Wavelength (Å)	Spectrum (counts sec⁻¹)			Average net counts sec⁻¹	Standard deviation of average (%)

	1	2	3
1500	54.6	52.0	52.5	11	10.2
1600	145	140	141	101	2.1
1700	658	650	635	608	1.6
1800	808	800	800	763	0.5
1900	351	351	353	314	0.3
2000	289	287	289	251	0.4
2100	623	630	624	590	0.5
2200	1,665	1,662	1,669	1,630	0.2
2300	2,870	2,740	2,720	2,740	2.4
2400	8,940	8,410	8,320	8,520	3.2
2500	21,120	19,940	19,780	20,250	2.9
2600	31,900	30,500	30,300	30,900	2.3
2700	30,700	29,500	29,500	29,900	1.9
1200	42.9	50.9	41.3	43.9 counts sec⁻¹ avg. background
1300	48.0	44.7	44.5
1400	45.3	44.3	43.8

Wavelength (Å)	Lamp (39.00 A) (photon cm⁻² sec⁻¹ sr⁻¹ Å⁻¹)	Blackbody (2798 K) (photon cm⁻² sec⁻¹ sr⁻¹ Å⁻¹)
1500	4.5 × 10⁵	1.5 × 10⁷
1600	7.1 × 10⁶	1.0 × 10⁸
1700	6.1 × 10⁷	5.2 × 10⁸
1800	3.8 × 10⁸	2.2 × 10⁹
1900	1.8 × 10⁹	8.1 × 10⁹
2000	4.8 × 10⁹	2.6 × 10¹⁰
2100	1.5 × 10¹⁰	7.2 × 10¹⁰
2200	4.5 × 10¹⁰	1.8 × 10¹²
2300	1.1 × 10¹¹	4.2 × 10¹¹
2400	2.7 × 10¹¹	9.0 × 10¹¹
2500	6.7 × 10¹¹	1.8 × 10¹²
2600	1.3 × 10¹²	3.4 × 10¹²
2700	2.7 × 10¹²	6.0 × 10¹²

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Applied Optics