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A capacitive probe for measuring the clearance between the piston and the cylinder of a gas piston gauge
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10.1063/1.3310092
/content/aip/journal/rsi/81/3/10.1063/1.3310092
http://aip.metastore.ingenta.com/content/aip/journal/rsi/81/3/10.1063/1.3310092

Figures

Image of FIG. 1.
FIG. 1.

Ratio of average gap pressure to inlet pressure in a constant width gap as a function of pressure difference between gap inlet and ambient (gap exit). Shown for .

Image of FIG. 2.
FIG. 2.

View of capacitance circuit utilizing a gas piston gauge.

Image of FIG. 3.
FIG. 3.

Schematic of piston gauge geometry for Ruska low, middle, and high range pistons.

Image of FIG. 4.
FIG. 4.

Gap capacitance as a function of vertical position of piston within cylinder for PG29, at gauge pressures of 58.3, 92.9, and 162.1 kPa.

Image of FIG. 5.
FIG. 5.

Capacitance of gap as a function of gauge pressure for PG35.

Image of FIG. 6.
FIG. 6.

Gap clearance in nm as a function of gauge pressure for PG35. Error bars are standard uncertainty in gap, .

Tables

Generic image for table
Table I.

Dimensions, operating conditions, capacitance measurements, and calculated gap clearance for six NIST gas piston gauges. Standard uncertainty listed for gap capacitance and gap clearance. Both and assume that gap is uniform in angular and vertical directions.

Generic image for table
Table II.

Distortion coefficient, standard uncertainty of distortion coefficient, and change in effective area due to distortion at maximum pressure, for six NIST gas piston gauges. is a “gauge” pressure.

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/content/aip/journal/rsi/81/3/10.1063/1.3310092
2010-03-10
2014-04-19
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: A capacitive probe for measuring the clearance between the piston and the cylinder of a gas piston gauge
http://aip.metastore.ingenta.com/content/aip/journal/rsi/81/3/10.1063/1.3310092
10.1063/1.3310092
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