Bendix M306 Continuous Resistance Strip Electron Multiplier, an ultraviolet detector representative of those used on the OSO-F satellite. Utilizes an open cathode magnetic electron multiplier design that does not need to be enclosed in a glass or other insulating envelope since the vacuum required for its operation is supplied by the lack of atmosphere in Earth orbit. A UV photon striking the surface of the cathode at the entrance grid of the device results in the release of one or more electrons. The first of a series of permanent magnets then directs the emitted electrons onto a strip of specially coated glass. This results in the release of a large number of secondary electrons. Repetition of this process leads to a cascade of charge. The current gain can be as high as 10 million fold. The detector was transferred to NASM by NASA (GSFC) in 1988.
Display Status
This object is on display in Boeing Aviation Hangar at the Steven F. Udvar-Hazy Center in Chantilly, VA.
Object Details
Country of Origin
United States of America
Type
INSTRUMENTS-Scientific
Manufacturer
Bendix Corp.
Dimensions
Other: 3/16 in. diameter x 1 in. tall x 1 in. long x 3/4 in. wide (0.5 x 2.5 x 2.5 x 1.9cm)
Other: 2 1/2 in. diameter (6.4cm)
Materials
Block - metal
Cathode - corrugated gold
Tubes - metal
Inventory Number
A19880226000
Credit Line
Transferred from the National Aeronautics and Space Administration
Data Source
National Air and Space Museum
Restrictions & Rights
Usage conditions apply
For more information, visit the Smithsonians Terms of Use.