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NCJRS Abstract

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NCJ Number: 148800 Find in a Library
Title: Noninvasive Evaluation of Vehicular Lamp Bulbs
Journal: Crime Laboratory Digest  Volume:21  Issue:1  Dated:(January 1994)  Pages:5-7
Author(s): W A Tobin
Date Published: 1994
Page Count: 3
Sponsoring Agency: National Institute of Justice/
Rockville, MD 20849
NCJRS Photocopy Services
Rockville, MD 20849-6000
Sale Source: National Institute of Justice/
NCJRS paper reproduction
Box 6000, Dept F
Rockville, MD 20849
United States of America

NCJRS Photocopy Services
Box 6000
Rockville, MD 20849-6000
United States of America
Document: PDF
Type: Survey
Format: Article
Language: English
Country: United States of America
Annotation: Headlights and other lamp bulbs removed from vehicles involved in accidents and submitted to laboratories for forensic analysis can include a wide variety of bulb types and conditions.
Abstract: While for some bulbs, an intact glass envelope is not a barrier to successful nondestructive evaluation of the filament characteristics, the construction of others, particularly sealed beam headlights, is not conducive to unobstructed visual and microscopic examination. Standard laboratory procedure for examining a lamp bulb with an intact glass envelope is the potentially dangerous practice of thermally or mechanically breaching and removing the envelope. This article describes a newly developed, noninvasive procedure to evaluate filaments in bulbs with intact glass envelopes, which combines X-radiography with both static and dynamic electrical continuity measurements. The only safety equipment required is a radiation monitor. 6 figures
Main Term(s): Science and Technology
Index Term(s): Crime laboratories; Forensic sciences; Glass analysis
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