Development of an optical pressure measurement system using an external cavity diode laser with a wide tunable frequency range

Takei, Yoshinori; Arai, Kenta; Yoshida, Hajime; Bitou, Youichi; Telada, Souichi; Kobata, Tokihiko

doi:10.1016/j.measurement.2019.107090

Cited by 41 publications

(23 citation statements)

References 17 publications

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“…where, ( ) is the pressure distribution along the clearance/gap between the piston and cylinder, ℎ( ) = ( ) − ( ) is the radial clearances between piston and cylinder at = 0 and along with the radial axis, respectively, and are the ideal radii of the piston and cylinder at = 0 and and are radii of piston and cylinder, respectively with varying engagement length (x). To calculate A2 and A3, pressure distribution has to be calculated using the theories developed in the references 3,4 . The gas flow rate in the gap between the piston and cylinder is given by equation 2…”

Section: Effective Area Calculationmentioning

confidence: 99%

“…where ( ) is Poiseuille's coefficient which is function of rarefaction parameter ( = ( )ℎ( )/ ( )) 3,4 , where is the coefficient of viscosity of gas i.e. 17.72 µPa sec for N2 [9] and = √2 ⁄ is the most probable speed, is the universal gas constant, is the molecular mass of the gas used and is the temperature inside APG.…”

Section: Effective Area Calculationmentioning

confidence: 99%

“…After calculating pressure distribution and crevice size, rarefaction parameter was calculated. The rarefaction parameter was further used to calculate Poisuelle's coefficient ( ( ) .by considering crevice as planar channel using kinetic Boltzmann equation 3,4 In case of the diffuse scattering of molecules on the crevice wall, the Poiseuille coefficient is given as [11]. In real sense, N2 gas does not have the complete accommodation, but its tangential component of accommodation coefficients is given by = 0.9 [10].…”

Section: Effective Area Calculationmentioning

confidence: 99%

“…Recently, NIST USA has been developed laser interferometer based Optical Interferometer Manometer (OIM) primary pressure standards [2][3][4]. To meet the requirement of mercury-free equipment, most of the NMIs has developed p-c assembly based primary pressure standards to realize the Pascal and maintain the traceability chain.…”

Section: Introductionmentioning

confidence: 99%

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Establishment of air piston gauge as primary pressure standard at CSIR-National Physical Laboratory INDIA

2020

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The air piston gauge (APG) was established at CSIR-National Physical Laboratory, India (NPLI) since 2000. Later the same piston- cylinder(p-c) assembly was calibrated in NIST USA; however, it was never published for metrology communities. As per international protocol, the establishment of the APG as a primary standard, the effective area of p-c assembly, and masses must be directly traceable to SI units. The first time we have calculated the effective area and associated uncertainty of p-c assembly using dimension and mass metrology, traceability to the SI units, i.e., meter and kilogram. To realize the APG as primary pressure standards, we have calculated the effective area of p-c assembly of APG directly from dimension metrology, which is further supported by various other methods. The effective area values obtained in the pressure range of 6.5 – 360 kPa lie in the range of 3.356729 – 3.357248 cm² due to uncertainty limitation in the measurement of dimension of internal diameter of cylinder. The expected values of the effective area which are also measured from cross-float technique against ultrasonic interferometer manometer (UIM), primary pressure standards. The accuracy in effective area measurement is possible only when the resolution in the internal radius of the cylinder should at least be up to 5th decimal order and the uncertainty is 80 nm. The expanded uncertainty was measured nearly 11 ppm at <em>k</em> = 2 by considering the uncertainty in internal radii of cylinder and radii of piston around 80 nm.

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Section: Effective Area Calculationmentioning

confidence: 99%

Section: Effective Area Calculationmentioning

confidence: 99%

Section: Effective Area Calculationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Establishment of air piston gauge as primary pressure standard at CSIR-National Physical Laboratory INDIA

2020

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“…RISE (RISE Research Institutes of Sweden) and Umeå university in Sweden also develop from 2000's, this type of refractometer (double FP cavity in Zerodur ® ) using an original method of pressure modulation (GAMOR) to limit temperature effects on the cavity [7], [8]. NIM (National Institute of Metrology of China) in China, NMIJ (National Metrology Institute of Japan) in Japan [9] and PTB (Physikalisch-Technische Bundesanstalt) in Germany [10] start the development of such instruments.…”

Section: Introductionmentioning

confidence: 99%

Towards an improved helium-based refractometer for pressure measurements

et al. 2020

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This paper describes a quantum realization of the pascal based a helium absolute refractometer at 532 nm. The short-term stability in pressure is ± 2 mPa with a resolution in pressure of this new optical pressure standard is better than 1 mPa with temperature stability about 1 mK. A new design of the refractometer is presented to have better temperature stability and accurate temperature measurements to reach uncertainties in pressure better than current conventional methods.

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