Focussing electroacoustic transducer and method for testing its output power
First Claim
1. A focusing electroacoustic transducer with a carrier which on its front side is equipped with a first group and on its rear side with a second group of ceramic peizoelements, wherein in normal operation of the electroacoustic transducer the first element group may be activated time delayed with respect to the second element group with in each case a high voltage impulse and may be set into operation for emitting sound, characterised in that the transducer for a transducer test operation is set up such that one of the element groups may be activated with a primary high voltage impulse corresponding to the high voltage impulse produced on normal operation and thereupon a secondary voltage impulse produced by the piezoelements of the other element group due to a mechanical loading transmitted via the carrier may be produced as a measurement signal and as a measure of the present transducer power compared to pregiven, previously determined and stored reference values which indicate the normal transducer power.
1 Assignment
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Accused Products
Abstract
With a focusing electroacoustic transducer with a carrier which on its front side is equipped with a first group and on its rear side with a second group of ceramic piezolelements, a testing of the transducer power in a transducer test operating mode is carried out in that one of the element groups on the front or rear side is impinged with a high voltage impulse corresponding to the high voltage produced on normal operation of the transducer, and thereupon a secondary voltage impulse serving as a measurement voltage which at the same time is produced by a mechanical loading of the piezoelements of the other group transmitted by the carrier, as a measure of the present transducer power of the activated element group is compared to pregiven, previously determined and stored reference values of the transducer power of the activated element group.
6 Citations
7 Claims
- 1. A focusing electroacoustic transducer with a carrier which on its front side is equipped with a first group and on its rear side with a second group of ceramic peizoelements, wherein in normal operation of the electroacoustic transducer the first element group may be activated time delayed with respect to the second element group with in each case a high voltage impulse and may be set into operation for emitting sound, characterised in that the transducer for a transducer test operation is set up such that one of the element groups may be activated with a primary high voltage impulse corresponding to the high voltage impulse produced on normal operation and thereupon a secondary voltage impulse produced by the piezoelements of the other element group due to a mechanical loading transmitted via the carrier may be produced as a measurement signal and as a measure of the present transducer power compared to pregiven, previously determined and stored reference values which indicate the normal transducer power.
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4. A method for testing the output power of a focusing electroacoustic transducer which is equipped on the front side with a first group and on the rear side with a second group of ceramic piezolelements, wherein in normal operation the first element group may be activated time-delayed with respect to the second element group with in each case a high voltage impulse and may be set into operation for emitting sound, wherein the method has the following steps:
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A one of the element groups is activated with a primary high voltage impulse which corresponds to a high voltage impulse produced in the normal operation of the electroacoustic transducer;
B a secondary voltage impulse which is produced in the piezoelements of the other element group by way of mechanical loading transmitted via the carrier after the primary high voltage impulse produced in step A, is derived as a measurement signal. C the secondary voltage impulse produced in step B and derived as a measurement signal is compared to at least one pregiven and in method steps A and B previously evaluated reference value of the transducer power of the activated element group. - View Dependent Claims (5, 6, 7)
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Specification