A capacitive pressure gauge as a reliable transfer pressure standard

Kumar, Yashwant; Kumar, Vinay; Jain, Kamlesh; Kashyap, Subhash C.

doi:10.1016/s0925-4005(99)00088-x

Cited by 16 publications

(4 citation statements)

References 12 publications

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“…for the last many decades. [8][9][10][11][12][13][14][15][16][17] In the past, many authors, including our group have reported lead-based materials for suitable pressure sensors in the low and high-pressure range, where a signicant change in dielectric constant, piezoelectric coefficient and capacitive reactance was observed as a function of pressure. [1][2][3][5][6][7]13,[18][19][20][21][22][23][24][25][26] However, the effect of pressure on change in dielectric constant was not as signicant that it can be realized for real high-pressure sensor devices.…”

Section: Introductionmentioning

confidence: 99%

Giant pressure sensitivity in piezo/ferro-electric ceramics

et al. 2020

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Section: Introductionmentioning

confidence: 99%

Giant pressure sensitivity in piezo/ferro-electric ceramics

et al. 2020

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“…The strain gauge type PTs have also been used very sparingly but for high pressure ranges up to 1.4 GPa [9][10]. The capacitance type PT as TS has also been used and produces accurate and repeated results up to 500 MPa [11]. The limited sensitivity, poor linearity and long term stability, zero shifts with time and high hysteresis of the PTs limit their use as a highly precise TS or a pressure measuring device for scientific and industrial applications.…”

Section: Introductionmentioning

confidence: 99%

A Computer Controlled Precision High Pressure Measuring System

Sadana¹,

Yadav²,

Jha³

et al. 2011

Measurement Science Review

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A microcontroller (AT89C51) based electronics has been designed and developed for high precision calibrator based on Digiquartz pressure transducer (DQPT) for the measurement of high hydrostatic pressure up to 275 MPa. The input signal from DQPT is converted into a square wave form and multiplied through frequency multiplier circuit over 10 times to input frequency. This input frequency is multiplied by a factor of ten using phased lock loop. Octal buffer is used to store the calculated frequency, which in turn is fed to microcontroller AT89C51 interfaced with a liquid crystal display for the display of frequency as well as corresponding pressure in user friendly units. The electronics developed is interfaced with a computer using RS232 for automatic data acquisition, computation and storage. The data is acquired by programming in Visual Basic 6.0. This system is interfaced with the PC to make it a computer controlled system. The system is capable of measuring the frequency up to 4 MHz with a resolution of 0.01 Hz and the pressure up to 275 MPa with a resolution of 0.001 MPa within measurement uncertainty of 0.025%. The details on the hardware of the pressure measuring system, associated electronics, software and calibration are discussed in this paper.

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“…The high precision EMT is generally used as a secondary pressure standard or a transfer pressure (TP) standard for the pressure measurement and for the calibration of pressure measuring instruments [1][2][3][4][5][6][7][8][9]. These EMTs convert motion generated by a forcesumming device into an electrical signal.…”

Section: Introductionmentioning

confidence: 99%

“…x 3 (mV) 3 x 4 (mV) 4 V(a 0 , a 1 ) = 0.005575767 V(a 1 , a 2 ) = 0.031631747 V(a 2 , a 0 ) = 0.005575767 δy/ δa 1 = x (mV) r(a 0 , a 1 ) = 0.00238193 r(a 1 , a 2 ) = 0.002863293 r(a 2 , a 0 ) = 0.144190815…”

mentioning

confidence: 99%

Least squares best fit line method for the evaluation of measurement uncertainty with electromechanical transducers (EMT) with Electrical Outputs (EO)

Yadav

Kumaraswamy

Gupta

et al. 2010

MAPAN

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In the electromechanical type indirect pressure indicating devices (IPIDs), the applied pressure is indirectly computed by some relationship between applied pressure and an analog / digital electrical signal in terms of voltage, current or frequency measured by a sensing element of such devices. If the output of an EMT in terms of any electrical quantity i.e. voltage, current or frequency, is related / dependent upon input quantity i.e. pressure then this relationship can be defined by a curve that has been fitted to experimental data by method of least square. The calculation of the calibration results and the associated uncertainties is a complex matter involving many influencing quantities. The present paper describes a method for calibration and evaluating uncertainty in pressure measurement using such EMTs with EOs through statistical analysis of errors.

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A capacitive pressure gauge as a reliable transfer pressure standard

Cited by 16 publications

References 12 publications

Giant pressure sensitivity in piezo/ferro-electric ceramics

Giant pressure sensitivity in piezo/ferro-electric ceramics

A Computer Controlled Precision High Pressure Measuring System

Least squares best fit line method for the evaluation of measurement uncertainty with electromechanical transducers (EMT) with Electrical Outputs (EO)

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