METHOD AND DEVICE FOR DETERMINING CHARACTERISTIC OF FREQUENCY REGION OF WAVE

Ultrasonic wave attenuation in an object is determined from the number of zero crossings of a reflected signal as a function of depth. The zero crossing density is indicative of the frequency spectrum, and by comparing the zero crossing density at one level to the zero crossing density at a second l...

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Bibliographische Detailangaben
Hauptverfasser:	SUTEFUAN UEIN FURATSUKUSU, NOOBAATO JIYOSEFU PERUKU, GIYARII HARORUDO GUROBAA, JIEIMUSU KENESU RIRII
Format:	Patent
Sprache:	eng
Schlagworte:	DIAGNOSIS HUMAN NECESSITIES HYGIENE IDENTIFICATION INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC ORINFRASONIC WAVES MEASURING MEASURING ELECTRIC VARIABLES MEASURING MAGNETIC VARIABLES MEDICAL OR VETERINARY SCIENCE PHYSICS SURGERY TESTING
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Beschreibung
Zusammenfassung:	Ultrasonic wave attenuation in an object is determined from the number of zero crossings of a reflected signal as a function of depth. The zero crossing density is indicative of the frequency spectrum, and by comparing the zero crossing density at one level to the zero crossing density at a second level a measure of attenuation therebetween is obtained. Apparatus for implementing the method comprises a zero crossing detector such as a Schmitt triggered monostable multivibrator and a pulse counter.