Expand this Topic clickable element to expand a topic
Skip to content
Optica Publishing Group

The Electric Welsbach Lamp

Not Accessible

Your library or personal account may give you access

Abstract

This lamp is to serve as a source of radiation from the visible into the far infrared. The heating unit consists of sheets of ashed Welsbach mantle heated by the glow or arc discharge formed between terminals connected to the secondary of a high potential transformer. When operated in air, a small, pointed gas flame is allowed to play on the mantle, thus steadying the electrical discharge and increasing the temperature. From 0.7 to 15μ, gas plus electricity are used, whereas, from 15μ, to 150μ, gas alone is employed. When the lamp is operated in a partial vacuum, variations in spectral distribution are effected largely by working at different pressures. At pressures around 10 cm the emission is similar to that of the gas Welsbach in the region of longer wave-lengths, while at pressures near 30 cm the emission rivals that of a Nernst lamp in the near infrared (0.7 to 15μ).

© 1936 Optical Society of America

Full Article  |  PDF Article
More Like This
Filters for the Infrared

R. Bowling Barnes and Lyman G. Bonner
J. Opt. Soc. Am. 26(12) 428-433 (1936)

Changes in Color Temperature of Tungsten-Filament Lamps at Constant Voltage*

Deane B. Judd
J. Opt. Soc. Am. 26(11) 409-420 (1936)

Spectral Radiant Intensities of Some Tungsten Filament Incandescent Lamps

B. T. Barnes and W. E. Forsythe
J. Opt. Soc. Am. 26(8) 313-315 (1936)

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Figures (4)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Select as filters


Select Topics Cancel
© Copyright 2024 | Optica Publishing Group. All Rights Reserved