Method for measuring the surface area of a solid

A method for enhancing the intensity of a photoacoustic signal by surrounding a solid with a gas having a normal boiling point at least about 25 DEG C. below the temperature at which the photoacoustic effect is being measured and a critical temperature not less than about 2 DEG C. By utilizing a sec...

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Bibliographische Detailangaben
Hauptverfasser:	GALLAGHER, JR., JOSEPH G, SCHAFFER, ARNOLD M
Format:	Patent
Sprache:	eng
Schlagworte:	INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES MEASURING PHYSICS TESTING
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Beschreibung
Zusammenfassung:	A method for enhancing the intensity of a photoacoustic signal by surrounding a solid with a gas having a normal boiling point at least about 25 DEG C. below the temperature at which the photoacoustic effect is being measured and a critical temperature not less than about 2 DEG C. By utilizing a second gas, selected from the permanent gases having a critical temperature not greater than about -73 DEG C., the surface area of a solid can be measured in accordance with procedures and relationships herein described.