A New Standard for the Candela in the USSR

Sapritskii, V. I.

doi:10.1088/0026-1394/24/2/001

Cited by 14 publications

(4 citation statements)

References 4 publications

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“…3. The spectral radiance Le, (A) is obtained from the BBM-3000, which is also used in the candela I, realization [8].…”

Section: Realization Of the Scale Of Spectral Radiance Lel (A)mentioning

confidence: 99%

“…The measurement system comprises the BBM-2500 (3.4) furnished with photoelectric pyrometers, test lamps to be calibrated (6) mounted on motor-driven rotatable tables (7), mirror condensers (10,l l), rotatable plane mirrors (9), integrating spheres (8), and a photometer (15). Optical bench (1) is intended for the transfer of the E,, (I,) and I,, (i) units and optical bench (2) for the Le, (3.)…”

Section: Realization Of Spectral Irradiance E (A) and Spectral Radian...mentioning

confidence: 99%

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National Primary Radiometric Standards of the USSR

Sapritskii¹

1990

Metrologia

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A versatile combined primary standard of the USSR has been established at VNIIOFI for the realization of radiometric units. The standard is based on two black bodies, operable at temperatures from 400 to 3000 K, and an absolute radiometer. Units of both spectral and broadband quantities are reproduced within the 0,2 pm to 25 pm range. A black-body radiator made of niobium carbide and graphite is used over the temperature range of 1500-3000 K, while that for the lower temperatures from 400 to 1200K is a heat-pipe with a sodium heattransfer medium. In order to determine the thermodynamic temperature T of the high-temperature black body, relative values of radiant flux P, ( T ) and spectral radiance Le, (ii, 7;) at several temperatures are found. The method allows realization of radiometric and photometric quantities irrespective of the International Practical Temperature Scale (IPTS-68). The absolute radiometer used is of a special design and has a control system capable of maintaining the conical receiving cavity at constant temperature throughout the measurement process. The absolute radiometer is intended to realize radiometric units as well as to measure the spectral sensitivity of radiation receivers.

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“…3. The spectral radiance Le, (A) is obtained from the BBM-3000, which is also used in the candela I, realization [8].…”

Section: Realization Of the Scale Of Spectral Radiance Lel (A)mentioning

confidence: 99%

Section: Realization Of Spectral Irradiance E (A) and Spectral Radian...mentioning

confidence: 99%

National Primary Radiometric Standards of the USSR

Sapritskii¹

1990

Metrologia

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“…Illuminance is a photometric quantity which is related to many aspects of human society, and the modern photometric standards have been realized in many national metrology institutes since about 40 years ago [1][2][3][4]. The new progress in photometry focuses on LED [5], detector-based realization of photometric scales [6] and mesopic photometry [7].…”

Section: Introductionmentioning

confidence: 99%

Extension of NIM illuminance scale to very low levels (1 × 10⁻¹⁰ lx to 2 lx)

Lv¹,

Jiang²,

Lin³

et al. 2022

Metrologia

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The realization of the low light level illuminance scale of the National Institute of Metrology (NIM, China) is presented. Two methods were used to achieve the photometric scale covering (1×10-10～2×100) lx, the first method based on the luminance adjustable two-stage integrating sphere source was used to realize the illuminance scale down to 1×10-6 lx, while the other method based on a twin-source superposition linearity measurement facility was applied to extend the scale from 1×10-6 lx to 1×10-10 lx. The expanded relative uncertainty of the (1×10-10～2×100) lx illuminance scale was evaluated to be from 1.0% to 0.8% varying with range (coverage factor k=2). As part of our research work, a photon counting type photometer was developed and calibrated in the (2×10-10～1×10-6) lx range using this low light level illuminance scale with expanded relative uncertainty 13% to 1.4% (k=2). This low light level photometric scale can meet the calibration requirement of high sensitivity photometers such as the micro-lux photometers and photon counting type photometers.

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“…The main factor in disagreement was the color temperature of modern tungsten filament light sources (2856 K), which was far from color temperature of freezing point of platinum. Also use of broadband rather than monochromatic radiation and extrapolation of the spectral distribution of blackbody radiator to higher color temperatures was the major uncertainty in the calculation of maximum spectral luminous efficacy of radiation (K m ) and realization of luminous intensity unit [4,6].…”

Section: Introductionmentioning

confidence: 99%