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Machine translation
1. (WO1981003701) INTEGRITY CHECK FOR ULTRASONIC FLUID INTERFACE SENSING SYSTEM
Latest bibliographic data on file with the International Bureau   

Pub. No.:    WO/1981/003701    International Application No.:    PCT/US1981/000736
Publication Date: 24.12.1981 International Filing Date: 01.06.1981
IPC:
G01F 23/296 (2006.01), G01F 25/00 (2006.01)
Applicants:
Inventors:
Priority Data:
158109 10.06.1980 US
Title (EN) INTEGRITY CHECK FOR ULTRASONIC FLUID INTERFACE SENSING SYSTEM
(FR) CONTROLE D'INTEGRITE POUR SYSTEME DE DETECTION D'INTERFACE A FLUIDE ULTRASONIQUE
Abstract: front page image
(EN)An ultrasonic system for sensing a liquid-fluid interface comprises a support structure (10) to which a transmitting crystal (21) and a receiving crystal (22) are bonded in such a way that the crystals (21 and 22) are positioned opposite each other across a gap (30). Each of the crystals (21 and 22) has a relatively high resonant frequency and a relatively low resonant frequency. An amplifier means (40) and a bandpass filter means (50) are connected to the crystals (21 and 22) to form a feedback loop. In normal operation, the transmitting crystal (21) is excited to resonate at its high resonant frequency in order to cause transmission of an ultrasonic signal across the gap (30) without causing appreciable ultrasonic transmission through the support structure (10) to the receiving crystal (22). When it is desired to test the system for integrity in the absence of liquid in the gap (30), the transmitting crystal (21) is excited to resonate at its low resonant frequency and the passband of the bandpass filter means (50) is shifted to enable low frequency oscillations to occur in the feedback loop due to ultrasonic transmission (i.e., cross-talk) through the support structure (10) between the crystals (21 and 22).
(FR)Un systeme ultrasonique de detection d'un interface liquide-fluide comprend une structure de support (10) sur laquelle un cristal de transmission (21) et un cristal de reception (22) sont lies de telle maniere que les cristaux (21 et 22) soient places opposes l'un a l'autre de part et d'autre d'un espace (30). Chacun des cristaux (21 et 22) possede une frequence de resonance relativement elevee et une frequence de resonance relativement basse. Un amplificateur (40) et un filtre de bande passante (50) sont connectes aux cristaux (21 et 22) pour former une boucle de reaction. En fonctionnement normal, le cristal de transmission (21) est excite pour resonner a sa frequence elevee de resonance de maniere a effectuer la transmission d'un signal ultrasonique au travers de l'espace (30) sans provoquer de transmission ultrasonique appreciable au travers de la structure de support (10) au cristal de reception (22). Lorsque l'on veut tester le systeme pour verifier son integrite en l'absence de liquide dans l'espace (30), le cristal de transmission (21) est excite a sa basse frequence de resonance et la bande passante du filtre a bande passante (50) est decalee pour permettre a des oscillations de basse frequence de se produire dans la boucle de reaction par transmission ultrasonique (c.a.d. diaphonie) par l'intermediaire de la structure de support (10) entre les cristaux (21 et 22).
Designated States:
Publication Language: English (EN)
Filing Language: English (EN)