A New Interferometric Manometer

Harrison, Edward; Hatt, D. J.; Prowse, D B; Wilbur-Ham, J

doi:10.1088/0026-1394/12/3/004

Cited by 29 publications

(9 citation statements)

References 12 publications

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“…The CSIRO standard [7] consisted of a mercury-filled U-tube manometer in which the mercury surfaces acted as the reflectors of a Michelson interferometer. The difference in heights of the mercury surfaces was measured by use of laser interferometry techniques using a He-Ne laser.…”

Section: Commonwealth Scientific and Industrial Research Organizationmentioning

confidence: 99%

Comparison of pressure standards in the range 10 kPa to 140 kPa

et al. 1998

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This report summarizes the results obtained by twelve laboratories in a comparison of pressure measurement standards in the range 10 kPa to 140 kPa, carried out under the auspices of the Consultative Committee for Mass and Related Quantities. Measurements were taken in the absolute mode and, by some participants, in the gauge mode. Good repeatability and, until near the end, reproducibility were observed in the transfer standard. The results displayed significant differences between some of the participants beyond those expected from their claimed uncertainties.

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Section: Commonwealth Scientific and Industrial Research Organizationmentioning

confidence: 99%

Comparison of pressure standards in the range 10 kPa to 140 kPa

et al. 1998

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“…The cat's-eye beam-reflecting devices of the type used in MM1, as well as in HG5 in its lower range, consist of focusing lenses carried by suitable floats, as shown in Figure 2. Studies on cat's-eyes were carried out some years ago for application in certain mercury manometers [11,12]. Unlike these previous realizations, the lightweight design adopted at the IMGC is such that the devices are able to float on the menisci rather than sink deeply into the mercury.…”

Section: Descriptionmentioning

confidence: 99%

The MM1 laser interferometer low-range mercury manometer of the IMGC

Alasia¹,

Capelli²,

Cignolo³

et al. 1999

Metrologia

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A compact version, designated MM1, of the HG5 primary standard manometer of the Istituto di Metrologia "G. Colonnetti" (IMGC) is described. The instrument was constructed in order to exploit thoroughly, in the range of pressures up to 5 kPa, the potential accuracy of the measurement principle and instrumentation already adopted in HG5 -the same optical components, instrument hardware and software can be used on either of the manometers. The improvement in measurement accuracy of the MM1 instrument over that of HG5 in the same range was largely obtained by reducing by an order of magnitude the lengths of both mercury and gas columns. This provision can reduce the uncertainties associated with the computation of aerostatic heads in the U-tube and with the correction of interferometer readings for gas refractivity, as well as reduce the detrimental effects of residual temperature gradients inside the manometer body. In addition, the systematic adoption of purpose-built cat's-eye optical devices allows the reflection of laser beams to be made directly on mercury menisci, whereas the massive, all-metal body construction of the manometer ensures an improved mechanical stability. The paper includes the uncertainty budget, with evaluated standard uncertainties ranging between 12 mPa at 1 Pa and 53 mPa at 5 kPa, in the relative or gauge measurement mode.

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“…The cat's-eye type of float is used in a manometer at the National Physical Laboratory (NPL) with a range of 110 kPa. It has also been used at the CSIRO in a manometer with a range of 100kPa [30]. The CSIRO floats have the added feature that the wall of the float at the interface with the reflecting mercury surface is inclined at the "normal" mercury contact angle, with the intention of minimizing capillary effects on the height of the enclosed pool of mercury.…”

Section: Float Retroreflectorsmentioning

confidence: 99%

Three and a Half Centuries Later - The Modern Art of Liquid-Column Manometry

Tilford

1994

Metrologia

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After three and a half centuries the Tomcellian mercury manometer remains the most accurate pressure standard. State-of-the-art manometers achieve parts-per-million total uncertainties near atmospheric pressures and imprecisions as low as 0,Ol Pa. The total uncertainty is determined primarily by uncertainties in the measurement of the height of the mercury surfaces and the average mercury density. The latter is limited generally by the uncertainty of the average temperature of the mercury. The techniques used to locate the mercury surfaces and determine their heights not only determine the imprecision and accuracy of the height measurement, but can also have a significant effect on the maintenance of a stable and uniform mercury temperature. This review discusses the factors important in highaccuracy manometers with particular emphasis on surface detection and height measurement techniques. Specifically discussed are capacitance detection, white-light fringes, optical interferometry, with and without floats, and ultrasonic measurements.

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A New Interferometric Manometer

Cited by 29 publications

References 12 publications

Comparison of pressure standards in the range 10 kPa to 140 kPa

Comparison of pressure standards in the range 10 kPa to 140 kPa

The MM1 laser interferometer low-range mercury manometer of the IMGC

Three and a Half Centuries Later - The Modern Art of Liquid-Column Manometry

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