Standard Lamp

2016 ◽  
pp. 1168-1170
Author(s):  
Cheng-Hsien Chen
Keyword(s):  
Standard Lamp

Brightness temperatures and intensity measurements in flash discharges

1961 ◽  
Vol 262 (1310) ◽  
pp. 409-419 ◽  
Keyword(s):  
Brightness Temperature ◽  
Wavelength Range ◽  
Intensity Distribution ◽  
Wave Number ◽  
Brightness Temperatures ◽  
Intensity Measurements ◽  
Capillary Type ◽  
Standard Lamp ◽  
The Continuum

The brightness temperature and the intensity distribution of the Lyman, coaxial and capillary-type flash tubes have been measured and compared over the wavelength range from 2580 to 4520 Å. The brightness temperature, obtained by comparison with a standard lamp, for these flash tubes ranged from 13 000 to 30 000 °K. The intensity per unit wave number was found to be independent of wave number over the above range for the Lyman and coaxial tubes. For the capillary flash the region independent of wave number extended up to 31 000 cm -1 beyond which the continuum decreased exponentially, in agreement with the predictions of the Unsöld-Kramers theory.

scholarly journals Studying the Calibration Compact Lamps as a Working Standards

2018 ◽  
Vol 6 (01) ◽  
Author(s):  
E. M. El-Moghazy ◽  
F.M. EL-Sharkawy
Keyword(s):  
High Power ◽  
Supply Voltage ◽  
Spectral Power ◽  
Luminous Flux ◽  
Working Standard ◽  
Working Standards ◽  
Standard Lamp

Working standards for compact lamps is very important to some inspection organizations in Egypt.  We prepare the working standard lamp of high power compact lamp .These lamps provide the realization of luminous flux scale in the photometry laboratory in national institute for standard (NIS).  We choose three types of lamps in our study.  The lamp types are compact florescent lamp at nominal watt (WL1) 85watt, (WL2) at nominal Watt 105 Watt with ballast and (WL3) at nominal Watt 105watt without ballast.  The spectral power distributions of all the standard lamps and test lamps are measured.  The results of experimentally obtained values of luminous flux of each lamp type at the calibration values of supply voltage at 220 volts are illustrated.

AN INVESTIGATION OF THE MACBETH ILLUMINOMETER

1948 ◽  
Vol 26f (2) ◽  
pp. 59-65 ◽  
Author(s):  
W. E. Knowles Middleton ◽  
A. R. Ramsey
Keyword(s):  
Color Temperature ◽  
Working Standard ◽  
Standard Lamp

The MacBeth illuminometer is a well known portable photometer of the visual type. Measurements of its errors show that the instrument gives reliable results if used with care. The most serious errors may occur when the color temperature of the light that is being measured differs greatly from that of the working standard lamp in the instrument. Under such conditions, different observers may obtain widely different results.

scholarly journals 29a. Working Group on Absolute Spectrophotometry

1970 ◽  
Vol 14 (1) ◽  
pp. 329-331
Author(s):  
J. B. Oke
Keyword(s):  
Melting Point ◽  
Temperature Scale ◽  
Spectral Energy Distribution ◽  
Thermodynamic Temperature ◽  
Spectral Energy ◽  
Light Sources ◽  
National Bureau ◽  
Practical Temperature ◽  
Practical Temperature Scale ◽  
Standard Lamp

Two new and independent determinations of the absolute spectral energy distribution in αLyr have been completed during the last three years. The first of these by Hayes has been published in part (Wolff, Kuhi and Hayes, 1968). It was done at the Lick Observatory using the Crossley reflector and two ribbon-filament standard lamps. His published results are based on the old practical temperature scale which is based on a melting point for gold of 1336·16K. The new scale has been adjusted to agree as well as possible with the thermodynamic temperature scale and is based on 1337·59K for the melting point of gold. Hayes’ results have been adjusted to this new scale and are shown in Table 1. The numbers listed are — 2·5 log fv + const, when fv is the flux from αLyr in ergs s-1 cm-2 Hz-1. The results are normalized to 0·000 at λ5556.The new calibration by Oke and Schild was carried out on Palomar Mountain. A four inch reflecting telescope was built and mounted with the prime focus scanner which was built for the 200-inch telescope. Three light sources were used (1) a ribbon-filament standard lamp calibrated with an accuracy of 2 % by the National Bureau of Standards was used from λ3300 to λ8000.

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.

400～900 nm Spectral Irradiance of Cryogenic Radiometer-Based Irradiance Standard Lamp Using System Level Calibration Method

2010 ◽  
Vol 30 (11) ◽  
pp. 3349-3353
Author(s):  
陈洪耀 Chen Hongyao ◽  
张黎明 Zhang Liming ◽  
邹鹏 Zou Peng ◽  
谢萍 Xie Ping ◽  
郑小兵 Zheng Xiaobing ◽  
...  
Keyword(s):  
Calibration Method ◽  
Spectral Irradiance ◽  
System Level ◽  
Cryogenic Radiometer ◽  
Standard Lamp
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