Abstract

The temperature variation of the total hemispherical emissivity h of an electropolished surface of 3N8 pure tungsten has been investigated with a transient calorimetric technique in the temperature range 180–1000 K. The experimental data are believed to be the first ever obtained on tungsten below 273 K and also the first ever obtained on electropolished tungsten above 273 K. It is found that the data depart in a significant manner at all temperatures investigated from the theory that assumes a zero relaxation time τ for conduction electrons. In the range 180–300 K, h behaves as though τ is finite and nearly independent of the frequency. At higher temperatures, h behaves in a manner that indicates qualitatively that τ is frequency dependent. Beginning at 600 K, the slope of the h -vs-T graph increases steadily up to 1000 K. This increase is belived to be due to the onset of interband excitations.

© 1978 Optical Society of America

Full Article  |  PDF Article

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

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

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 OSA member, or as an authorized user of your institution.

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

Figures (7)

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

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

Tables (2)

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

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

Equations (7)

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

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