Results of a bilateral comparison of the high-vacuum primary standards at the Korea Research Institute of Standards and Science and the UK National Physical Laboratory

Hong, S. S.; Chung, Kyu Jin; Redgrave, F J

doi:10.1088/0026-1394/37/1/2

Cited by 4 publications

(1 citation statement)

References 5 publications

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“…Type B uncertainties (also known as systematic uncertainties are usuallyˆxed and depend on the design of the system as well as history of measuring instruments used) Fig. 14 Results of the bilateral comparison between; (a) NMIJ (Formerly ETL) and KRISS 46) , (b) NPL (UK) and KRISS 47) . Table 2 For UIM at 1.3125 kPa, the combined standard uncertainty was determined from the quadratic addition of the individual sources.…”

Section: Uncertainties Data Sheetmentioning

confidence: 99%

The KRISS Primary Vacuum Gauge Calibration Standards: A Review

Khan¹,

Hong

Satar³

et al. 2016

J. Vac. Soc. Jpn.

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The calibration of vacuum gauges is mainly carried out in two ways; i) using the primary standards in which the readings of a test gauge are compared with the pressures generated by the standard, and ii) by comparison method in which the readings of the gauge under test are compared with the output signal of a secondary standard. The former type of standards are, usually, large and complicated systems comprising of vacuum pumps, chambers, valves, and gauges etc. while the later type are simply vacuum gauges, with superior qualities, which are attached to a properly designed calibration system. The Vacuum Measurement Lab at Korea Research Institute of Standards and Science (KRISS), Rep. of Korea, maintains primary standards as well as systems for calibration by comparison method. The KRISS primary standards can be used for the calibration purpose in the pressure range from ～10-7 Pa to 133 kPa. For bilateral as well as key comparison of these standards, KRISS has participated in the past where its standards have good degree of equivalence and hence international recognition, with other national standards like that of NIST, PTB, NPL(UK), etc. Besides, the KRISS Vacuum Measurement Lab also has comparison system which can be used for calibration by comparison method. However, here the KRISS primary vacuum gauge calibration standards are discussed brie‰y with the aim to provide enough information to the readers in a single paper.

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Section: Uncertainties Data Sheetmentioning

confidence: 99%

The KRISS Primary Vacuum Gauge Calibration Standards: A Review

Khan¹,

Hong

Satar³

et al. 2016

J. Vac. Soc. Jpn.

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Twin-photon techniques for photo-detector calibration

Brida

Genovese

2005

Laser Phys. Lett.

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The aim of this review paper is to enlighten some recent progresses in quantum optical metrology in the part of quantum efficiency measurements of photo-detectors performed with bi-photon states. The intrinsic correlated nature of entangled photons from Spontaneous Parametric Down Conversion phenomenon has opened wide horizons to a new approach for the absolute measurement of photodetector quantum efficiency, outgoing the requirement for conventional standards of optical radiation; in particular the simultaneous feature of the creation of conjugated photons led to a well known technique of coincidence measurement, deeply understood and implemented for standard uses. On the other hand, based on manipulation of entanglement developed for Quantum Information protocols implementations, a new method has been proposed for quantum efficiency measurement, exploiting polarisation entanglement in addition to energy-momentum and time ones, that is based on conditioned polarisation state manipulation. In this review, after a general discussion on absolute photo-detector calibration, we compare these different methods, in order to give an accurate operational sketch of the absolute quantum efficiency measurement state of the art.

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Measurement uncertainties for vacuum standards at Korea Research Institute of Standards and Science

Hong

Shin

Chung

2006

Journal of Vacuum Science &Amp; Technology A: Vacuum, Surfaces, and Films

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The Korea Research Institute of Standards and Science has three major vacuum systems: an ultrasonic interferometer manometer (UIM) (Sec. II, Figs. 1 and 2) for low vacuum, a static expansion system (SES) (Sec. III, Figs. 3 and 4) for medium vacuum, and an orifice-type dynamic expansion system (DES) (Sec. IV, Figs. 5 and 6) for high and ultrahigh vacuum. For each system explicit measurement model equations with multiple variables are, respectively, given. According to ISO standards, all these system variable errors were used to calculate the expanded uncertainty (U). For each system the expanded uncertainties (k=1, confidence level=95%) and relative expanded uncertainty (expanded uncertainty/generated pressure) are summarized in Table IV and are estimated to be as follows. For UIM, at 2.5–300Pa generated pressure, the expanded uncertainty is <4.17×10−2Pa and the relative expanded uncertainty is <1.18×10−2; at 1–100kPa generated pressure, the expanded uncertainty is <7.87Pa and the relative expanded uncertainty is <7.84×10−5. For SES, at 3–100Pa generated pressure, the expanded uncertainty is <1.77×10−1Pa and the relative expanded uncertainty is <1.81×10−3. For DES, at 4.6×10−3–1.3×10−2Pa generated pressure, the expanded uncertainty is <1.04×10−4Pa and the relative expanded uncertainty is <8.37×10−3; at 3.0×10−6–9.0×10−4Pa generated pressure, the expanded uncertainty is <8.21×10−6Pa and the relative expanded uncertainty is <1.37×10−2. Within uncertainty limits our bilateral and key comparisons [CCM.P-K4 (10Pa–1kPa)] are extensive and in good agreement with those of other nations (Fig. 8 and Table V).

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Results of a bilateral comparison of the high-vacuum primary standards at the Korea Research Institute of Standards and Science and the UK National Physical Laboratory

Cited by 4 publications

References 5 publications

The KRISS Primary Vacuum Gauge Calibration Standards: A Review

The KRISS Primary Vacuum Gauge Calibration Standards: A Review

Twin-photon techniques for photo-detector calibration

Measurement uncertainties for vacuum standards at Korea Research Institute of Standards and Science

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