EG&G DT-150 Light Intensity Detector  
Written by Accutron on 2013-02-23  

The Edgerton, Germeshausen & Grier (EG&G) DT-150 Light Intensity Detector is the light sensing component of the AN/ASH-4 Light & Time Recording Set, a type of non-imaging radiometer known as a bhangmeter. Bhangmeters utilize a phototube or photodiode sensor to record a nuclear explosion's light intensity over time. Such detonations have a characteristic double-peak light emission curve. By measuring the time between the two peaks, a determination of the nuclear device's yield may be obtained.

The AN/ASH-4 is part of the Indirect Bomb Damage Assessment (IBDA) system, a specialized instrument package installed on a B-50D Superfortress strategic bomber. The IBDA system consists of the AN/ASH-4, AN/APQ-24 Radar Set and a K-17 Aerial Camera. The AN/ASH-4 was also installed in two Lockheed F-94 Starfires. The IBDA system was used to examine atmospheric detonations during Operation Teapot, a series of 14 nuclear test explosions conducted at the Nevada Test Site in 1955.

EG&G DT-150 Light Intensity Detector.

DT-150, underside interface and orientation mark.

DT-150, closeup of internals.

DT-150, identification placard.

Typical bhangmeter double peak reading from a 19Kt nuclear event - Operation Tumbler-Snapper, fourth detonation, modified TX-7 device, May 1, 1952.

This article is part of the [Aerospace & Defense Components] exhibit.

©2000-2019 The Vintage Technology Association. All rights reserved.