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 .
View of capacitance circuit utilizing a gas piston gauge.
Schematic of piston gauge geometry for Ruska low, middle, and high range pistons.
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.
Capacitance of gap as a function of gauge pressure for PG35.
Gap clearance in nm as a function of gauge pressure for PG35. Error bars are standard uncertainty in gap, .
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.
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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