Detector, Electron Multiplier

Detector, Electron Multiplier

     

Bendix manufactered this open cathode electron multiplier and detector circa early 1960s, typical of detectors flown on early OSO spacecraft. The cathode is not enclosed in a glass or other insulating envelope since it was designed to work in the vacuum of space. A sufficiently energetic UV photon striking 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 with the resulting current gain as high as 10 million fold.

The detector was transferred to NASM by NASA (GSFC) in 1995.

Transferred from the National Aeronautics and Space Administration

Country of Origin
United States of America

Manufacturer
Bendix Corp.

Location
Steven F. Udvar-Hazy Center, Chantilly, VA
Hangar
Boeing Aviation Hangar

Type
INSTRUMENTS-Scientific

Materials
Overall - metal and glass, electronics
Dimensions
3-D: 8 x 3.3 x 2.9cm (3 1/8 x 1 5/16 x 1 1/8 in.)

Bendix manufactered this open cathode electron multiplier and detector circa early 1960s, typical of detectors flown on early OSO spacecraft. The cathode is not enclosed in a glass or other insulating envelope since it was designed to work in the vacuum of space. A sufficiently energetic UV photon striking 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 with the resulting current gain as high as 10 million fold.

The detector was transferred to NASM by NASA (GSFC) in 1995.

Transferred from the National Aeronautics and Space Administration

Country of Origin
United States of America

Manufacturer
Bendix Corp.

Location
Steven F. Udvar-Hazy Center, Chantilly, VA
Hangar
Boeing Aviation Hangar

Type
INSTRUMENTS-Scientific

Materials
Overall - metal and glass, electronics
Dimensions
3-D: 8 x 3.3 x 2.9cm (3 1/8 x 1 5/16 x 1 1/8 in.)

ID: A19950049000