Electrode dimensions of the Bayard-Alpert ionization gauge and its sensitivity

Collector position in the centre of the anode gave maximum sensitivity.

“The collector position in the centre of the anode gave the maximum sensitivity [12,16].”

A large diameter (40 mm) with at the same time small length (5 mm) appeared unfavourable.

“However, a large diameter (40 mm) with at the same time small length (5 mm) appeared unfavourable [16].”

Forming a thin wire into a helical one gave the same sensitivity as a 1 mm wire.

“Forming a thin wire into a helical one (0.15 mm wire into a helical diameter of 1 mm with 6 turns per 1 mm) gave the same sensitivity as a 1 mm wire [16].”

Groszkowski found sensitivity decreases monotonically by about a factor of 10 when collector diameter dc was changed from 2 mm to 9 μm.

“He found that the sensitivity decreases monotonically by about a factor of 10 when the collector diameter d c was changed from 2 mm to 9 μm [16].”

Groszkowski estimated the number of oscillations of electrons as 2 to 4, with higher number for smaller grid wire diameters.

“Groszkowski also estimated the number of oscillations of the electrons and found 2 to 4 oscillations, where the higher number is true for smaller grid wire diameters [16].”

Sensitivity increased with the length of the collector wire, with the larger effect for bigger diameters.

“The sensitivity also increased with the length of the collector wire, with the larger effect for bigger diameters [16].”

Replacing one collector wire by four parallel wires forming a square prism increased sensitivity by 20% only.

“Replacing the one collector wire by four parallel of the same kind forming a square prism did increase the sensitivity by 20% only [16].”