Thermal measuring and testing – Determination of inherent thermal property
Patent
1997-05-05
2000-08-01
Oen, William
Thermal measuring and testing
Determination of inherent thermal property
374 12, G01N 2500
Patent
active
060956801
ABSTRACT:
This invention presents an improved way to determine, nondestructively, the composition of an unknown material sample such as, for example, an alloy steel fastener or a carbon steel fastener of unknown standard grade. The procedure involves utilizing a pulse of heat from a focused laser or infrared heater to a spot at the end of a standard grade fastener of known length or applying a pulse of cold and then placing an infrared temperature detector a specific distance from the heat or cold source and measure the temperature-time transmission. Over an interval of time the nature of the transmitted pulse and the time variation of temperature causes a pattern that allows the determination of the alloy content of the bolt. The temperature-time signature of the bolt, the decay curve after shut-off and the slopes of the curves can be used to detect inferior or mismatched bolts in a laboratory, in a plant or production floor environment or in situ testing in installed equipment. The device will discriminate between the standard Society of Automotive Engineers designated standard grade 8 fastener and the grade 8.2 fastener and most of those used as counterfeits. In addition, it will distinguish between the grade 8 standard fastener, as well as the steel alloys accepted as substitutes for the grade 8 standard, and many of those carbon steel fasteners that are used as counterfeits and thus serve as a screening device in conjunction with established methods of determining the composition of metallic materials.
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Marshall Jeffrey D.
Oen William
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