A pyrographite blackbody source BB3200pg has been developed
after many years of research pursuing more accurate UV measurements.
Unique properties of pyrographite as aniso-tropic refractory
material made it possible to improve substantially the operating
and metrological characteristics of blackbody sources (specifically,
maximum temperature and service life).
For the first time, a “sandwich” technology is realized,
that is, the radiator is assembled from pyrographite rings.
As a result, a high radiance uniformity along the cavity and
the bottom has been attained, as well as longer service life
at maximum temperature and high electric resistance. The source
is designed so that only individual pyrographite rings need
replacement after protracted operation and not the whole cavity.
The BB3200pg is intended for accurate and reliable measurements
of spectral radiance or spectral irradiance in the wavelength
range starting from 200 nm, and also for temperature measurements.
BB3200 has been installed at NIST (USA, 2 off), PTB
(Germany, 2 off), NPL (UK), NIM (China), VNIIOFI (Russia)
Delivery Set
Stainless steel water cooled housing
Radiator assembly
One spare set of replaceable parts
Argon purge supply/safety interlock systems
Cooling plant water supply/safety interlock systems with flow
meter with flow meter (low pressure input)
Cooling plant water supply/safety interlock systems with flow
meter
Precision aperture with water-cooled holder
Temperature stabilized water circulator for aperture holder
and optical feedback system
Vacuum vane pump with pressure gauge and accessories
User Manual and Protocols of Tests
System integration and personnel training, including
10 days on-site visit of Vega International specialist.
12 months warranty parts and labor.
References
1) Sperfeld P., Metzdorf J., Galal Yousef S., Stock K. D.
and Möller W. Improvement and extension of the black-body-based
spectral irradiance scale -Metrologia, 1998, 35, No 4, pp.
267-271
2) Sperfeld P., Metzdorf J., Harrison N. J., Fox N. P., Klevnoy
B. B., Khromchenko V. B., Mekhontsev S. N., Schapoval V. I.,
Zelener M. F., Sapritsky V. I. Investigation of High Temperature
Blackbody BB3200pg - Metrologia, 1998, v. 35, No 4, pp. 419-422
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