Ideas how to use the big piezoelements for the gauge with the small aperture

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Ideas how to use the big piezoelements for the gauge with the small aperture by Mind Map: Ideas how to use the big piezoelements for the gauge with the small aperture

1. a wave guide with focusing mirrors

1.1. a paraboloid

1.2. heart mirrors

2. a wave guide with refracting focusing surfaces

2.1. Fresnel lens

3. diaphragm use

4. use of effect of diffraction

4.1. ultrasonic holography

5. the classical acoustic concentrator

6. Hammer method: to neglect geometrical accuracy and to deduce an energy stream through a small window somehow

7. phased array