RADIOMETRIC TEMPERATURE MEASUREMENTS OF SHORT DURATION EVENTS
Abstract
A 4-color spectroscope using the wavelengths 0.546, 0.577, 0.623, and 0.750 microns was used to determine the surface temperatures of electrically exploded wires and aluminum projectiles of velocity 4,500 m/sec. Several values of initial capacitor energy, pressure, and ambient atmosphere were used with the exploded wires. The projectiles were observed in a normal atmosphere at 710 mm Hg. The temperatures observed for exploded wires for an initial capacitor energy of 0.8 joule in air at 710 mm Hg were: 3825 ! 25 K for aluminum, 3100 ! 75 K for copper, and 3700 ! 25 K for tungsten. For an aluminum projectile in air at 710 mm Hg at a velocity of 4,500 m/sec, the temperature observed was 3250 ! 50 K. The spectral distribution in all cases was observed to be black body and could be fitted by the Wien radiation law. Calibration was achieved using a tungsten ribbon lamp. Blackbody radiation data from the Planck radiation law are also given using the new value for the second radiation constant, C2 = 14,388 microns K for temperatures from 2000 to 4000 K and wavelengths from 0.500 to 0.800 microns.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1961
- Accession Number
- AD0272075
Entities
People
- Earle B. Mayfield
Organizations
- Naval Air Weapons Station China Lake