Pressure-measurement errors in a cold-cathode-ionization gauge caused by an external-electron source

2004 ◽  
Vol 22 (5) ◽  
pp. 2212-2215 ◽  
Author(s):  
Hiroshi Saeki ◽  
Tamotsu Magome ◽  
Yoshihiko Shoji ◽  
Takashi Momose
Keyword(s):  
Pressure Measurement ◽  
Measurement Errors ◽  
Electron Source ◽  
Cold Cathode ◽  
Ionization Gauge

Total Pressure Correction of a Sub-Miniature Five-Hole Probe in Areas of Pressure Gradients

2012 ◽  
Author(s):  
J. Town ◽  
A. Akturk ◽  
C. Camcı
Keyword(s):  
Pressure Measurement ◽  
Measurement Errors ◽  
Total Pressure ◽  
Pressure Gradients ◽  
Pressure Data ◽  
Flow Conditions ◽  
Complex Flow ◽  
Ducted Fan ◽  
The Difference ◽  
Best Fit

Five-hole probes, being a dependable and accurate aerodynamic tools, are excellent choices for measuring complex flow fields. However, total pressure gradients can induce measurement errors. The combined effect of the different flow conditions on the ports causes the measured total pressure to be prone to a greater error. This paper proposes a way to correct the total pressure measurement. The correction is based on the difference between the measured total pressure data of a Kiel probe and a sub-miniature prism-type five-hole probe. By comparing them in a ducted fan related flow field, a line of best fit was constructed. The line of best fit is dependent on the slope of the line in a total pressure versus span and difference in total pressure between the probes at the same location. A computer program, performs the comparison and creates the correction equation. The equation is subsequently applied to the five-hole probe total pressure measurement, and the other dependent values are adjusted. The validity of the correction is then tested by placing the Kiel probe and the five-hole probe in ducted fans with a variety of different tip clearances.

THE MAGNETRON GAUGE: A COLD-CATHODE VACUUM GAUGE

1959 ◽  
Vol 37 (11) ◽  
pp. 1260-1271 ◽  
Author(s):  
P. A. Redhead
Keyword(s):  
Magnetic Field ◽  
Anode Voltage ◽  
Axial Magnetic Field ◽  
Ion Current ◽  
Cold Cathode ◽  
Linear Region ◽  
Vacuum Gauge ◽  
Ionization Gauge ◽  
The Relationship ◽  
Unit Pressure

A cold-cathode ionization gauge with axial magnetic field is described which is capable of measuring pressure in the range 10−3to 10−12 mm Hg and is primarily useful in the range above 5 × 10−10 mm Hg. The gauge is operated with an anode voltage of 6 kilovolts and a magnetic field of 1000 gauss. The relationship between ion current and pressure is linear in the pressure range 10−4 to 5 × 10−10 mm Hg; at lower pressures the relationship i+ = cP1.7 obtains. In the linear region the ion current per unit pressure is given by i+ (amperes) [Formula: see text](mm Hg) for nitrogen (i.e., a sensitivity about 45 times greater than obtainable with a thermionic triode gauge).

Characteristics of a cold cathode electron source combined with secondary electron emission in a FED

2005 ◽  
Vol 251 (1-4) ◽  
pp. 170-176 ◽  
Author(s):  
Wei Lei ◽  
Xiaobing Zhang ◽  
Xuedong Zhou ◽  
Zuoya Zhu ◽  
Chaogang Lou ◽  
...  
Keyword(s):  
Electron Emission ◽  
Secondary Electron ◽  
Secondary Electron Emission ◽  
Electron Source ◽  
Cold Cathode
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