[Doc Ewen looks into the horn antenna, 1950]
Image courtesy of Doc Ewen

Introduction

Harvard Cyclotron: 1948-1951


Detection of HI Line: 1951

Harvard 24ft and 60ft and NRAO founding: 1952-1956

1950s and 1960s: Two Roads that Crossed

Microwave & Millimeter Wave Applications in the 1970s and 1980s

Mm Wave Radiometry in the 1990s

May 2001 visit to NRAO Green Bank

Bibliography

Permissions


[Doc Ewen and horn antenna, 2001]
Image courtesy of Doc Ewen

Doc Ewen: The Horn, HI, and Other Events in US Radio Astronomy

by Doc Ewen, © 2003

Millimeter Wave Radiometry in the 1990s: PADLOC slides 18a & 18b

Visual and radiometric images

A 1600 foot overflight of Westover, approaching from the west. The radar was turned off and the radiometric mode only was used on this pass. The visual camera has a FOV of 37 degrees, the radiometric is 50 degrees. On a foggy day, the visual image would be blank, but the radiometric image would be unchanged.

[Visual image of Westover Airport]

Visual image of Westover Airport. Credit: Photo courtesy of Doc Ewen.

[Radiometric image of Westover Airport]

Radiometric image of Westover Airport. Credit: Photo courtesy of Doc Ewen.

PADLOC slide 19
Modified on Monday, 13-Jun-2005 17:51:11 EDT by Ellen Bouton