PRINCIPLES AND INSTRUMENTATION FOR THE MEASUREMENT OF WORK-FUNCTION VARIATIONS BY ELECTRON-BEAM SCANNING.
NAVAL RESEARCH LAB WASHINGTON D C
Pagination or Media Count:
An experimental tube and associated circuitry were developed to measure the point-by-point variation or patchiness in the work function of conductive surfaces. The technique involves scanning the surface with a smalldiameter, low-energy electron beam in a television-like fashion. An enlarged image showing the pattern of the work-function variation on the surface is obtained on a kinescope tube. The associated circuitry also provides a method of obtaining, during one scan, the values of the work functions of many small regions of the scanned surface. These individual values are automatically catalogued and stored by means of a 400-channel analyzer which gives a plot of the area distribution in work function in about three seconds. This instrumentation was primarily designed for the purpose of measuring patch distributions on surfaces that might be used as thermionic sources of electrons in vacuum tubes and energy converters. Author
- Electrooptical and Optoelectronic Devices
- Electric Power Production and Distribution
- Test Facilities, Equipment and Methods