EP 2796208 A1 20141029 - Method for controlling an acoustic cell
Title (en)
Method for controlling an acoustic cell
Title (de)
Verfahren zur Steuerung einer akustischen Zelle
Title (fr)
Procédé pour commander une cellule acoustique
Publication
Application
Priority
EP 13164759 A 20130422
Abstract (en)
The present invention is related to an iterative method for controlling an acoustic cell (1) separating dispersed particles in a liquid medium, said acoustic cell (1) comprising two opposed plates (5) delimiting a resonating cavity filled with said liquid medium, at least one of the opposed surfaces (4) comprising a piezoelectric transducer (4) coupled to an electrical power generator for producing ultrasonic waves in said resonating cavity, said method comprising the steps of: a. applying an ultrasonic sound field by applying a periodic electrical potential of initial resonant frequency fi and initial power Pi to said piezoelectric transducer (5); b. measuring the cosine of the resulting phase shift phi (cos(phi)) between the electric current and the electric potential applied to the transducer (5); c. if the cos(phi) is lower than a predetermined threshold, increasing the power Pi, else decreasing the power Pi; d. determining the sign of the gradient of cos(phi) as a function of the frequency; e. varying the frequency in the gradient direction thereby maximising cos(phi); f. getting to step (b).
IPC 8 full level
B06B 1/02 (2006.01)
CPC (source: EP)
B06B 1/0246 (2013.01)
Citation (applicant)
EP 0633049 A1 19950111 - TRAMPLER FELIX [AT], et al
Citation (search report)
- [Y] US 5711888 A 19980127 - TRAMPLER FELIX [AT], et al
- [Y] US 5892315 A 19990406 - GIPSON LAMAR HEATH [US], et al
- [Y] US 4689515 A 19870825 - BENNDORF GERALD [DE], et al
- [A] EP 1195460 A2 20020410 - KAO CORP [JP]
- [A] US 2011254519 A1 20111020 - HASEGAWA HIROSHI [JP], et al
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated extension state (EPC)
BA ME
DOCDB simple family (publication)
EP 2796208 A1 20141029; WO 2014173745 A2 20141030; WO 2014173745 A3 20150326
DOCDB simple family (application)
EP 13164759 A 20130422; EP 2014057685 W 20140416