Should Tungsten Ribbon Lamps Be Replaced or Not?

2003 ◽  
Author(s):  
M. S. Matveyev
Keyword(s):  
Tungsten Ribbon

Laser cleaning of tungsten ribbon

2014 ◽  
Vol 308 ◽  
pp. 216-220 ◽  
Author(s):  
Aniruddha Kumar ◽  
V.R. Sonar ◽  
D.K. Das ◽  
R.B. Bhatt ◽  
P.G. Behere ◽  
...  
Keyword(s):  
Laser Cleaning ◽  
Tungsten Ribbon

Multiple colorimetry of the Sun

1966 ◽  
Vol 24 ◽  
pp. 254-255
Author(s):  
G. E. Kron
Keyword(s):  
Full Moon ◽  
The Other ◽  
The Sun ◽  
Optical Instrument ◽  
Electric System ◽  
Other Hand ◽  
Color System ◽  
Tungsten Ribbon ◽  
Standard Lamp ◽  
Modern Standard

In spite of the importance of knowing the color of the Sun on a modern standard photo-electric system, only two efforts have been made during recent times to measure this quantity. These are by Stebbins and Kron (1) who measured the Sun on the six-color system of Stebbins and Whitford, and by Louis Gallouët (2) who measured the Sun on theUBVsystem of Johnson and Morgan. Stebbins and Kron compared the light from the Sun after it had been dimmed with a special “reducing” device with the light from a tungsten ribbon filament standard lamp, which, in turn, had been compared with the light of distant stars. Gallouët, on the other hand, measured both the Sun and stars by means of an extremely ingenious optical instrument that acted as a light gatherer when used on the distant stars, and as a light reducer when used in its inverted optical sense on the Sun. Gallouët also measured the magnitude of the Sun, as well as the color and magnitude of the full Moon.

A new determination of the emissivity of tungsten ribbon

Physica ◽  
1954 ◽  
Vol 3 (7-12) ◽  
pp. 690-I ◽  
Author(s):  
J DEVOS
Keyword(s):  
Tungsten Ribbon

The Temperature Measurements of Polymethyl Methacrylate Under Shock Loading

2011 ◽  
Vol 6 (1) ◽  
pp. 116-122
Author(s):  
Sergey A. Bordzilovsky ◽  
Sergey M. Karakhanov
Keyword(s):  
Absorption Coefficient ◽  
Brightness Temperature ◽  
Polymethyl Methacrylate ◽  
Shock Loading ◽  
Equations Of State ◽  
Incandescent Lamp ◽  
Temperature Measurements ◽  
Optical Pyrometer ◽  
Tungsten Ribbon

The brightness temperature was measured in polymethyl methacrylate shocked to 35 GPa by means of the fast two wavelengths optical pyrometer. The calibration of the pyrometer was performed by using a standard tungsten ribbon incandescent lamp prior to each shot. The measured brightness temperature at the wavelength λ = 550 nm was Tb = (1540 ± 30) K and at the wavelength λ = 630 nm it was Tb = (1510 ± 110) K. The results were compared with the temperature calculations obtained from different polymethyl methacrylate equations of state. The absorption coefficient of the shocked polymethyl methacrylate (α = 2.5 mm–1) was determined by using the time dependences in the pyrometric signals

Evolution of the Surface Structure of CVD Tungsten During Annealing

1995 ◽  
Vol 403 ◽  
Author(s):  
C. L. Briant ◽  
R. H. Wilson ◽  
L. Bigio ◽  
W. G. Morris
Keyword(s):  
Chemical Vapor Deposition ◽  
Surface Structure ◽  
Rough Surface ◽  
Vapor Deposition ◽  
Chemical Vapor ◽  
Tungsten Ribbon ◽  
Tungsten Surface

AbstractThis paper reports a study in which a rough tungsten surface was prepared by chemical vapor deposition of tungsten on a tungsten ribbon. The samples were then heated to study the smoothing behavior of the rough surface. The results show that at 1600°C the surface becomes smooth after approximately five to ten hours. At 2400°C the surface becomes smooth within 15 minutes.

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