Microperforated absorbers
Microperforated absorbers: Precision in the millimeter range
Microperforated absorbers (MPAs) represent the technological pinnacle of modern acoustic wall and ceiling systems. While conventional resonators often rely on additional insulating materials, the HSA3 utilizes the pure physics of air friction in microscopically small openings.
Structure and mode of operation
A microperforated absorber consists essentially of three precisely matched components:
- The microperforated plate: A surface with a multitude of microscopically small holes.
- The air volume: A sealed cavity directly behind the plate.
- The sound-reflective back wall: This forms the acoustic boundary of the system.
From a physics perspective, it is an acoustic mass-spring system based on the principle of the Helmholtz resonator: The air mass in the holes oscillates in a controlled manner in front of the elastic "air spring" of the rear volume.
The secret of viscous friction
The crucial difference compared to conventional perforated plates lies in the hole size. In standard resonators, the air often glides through the center without friction, necessitating damping fleeces to slow it down. In the HSA3, however, the holes are so small that the acoustic boundary layer extends across the entire cross-section of the hole.
- The entire air mass in the hole is subject to viscous friction against the hole walls.
- Sound energy is converted directly into heat with high efficiency in these micropores.
- Some of this frictional heat is dissipated via the thermal conductivity of the plate material.
Advantages of HSA3 technology
The use of this boundary layer friction enables performance levels that remain unattainable with conventional absorbers:
Fiber-free hygiene
Since the friction within the hole is sufficient, no mineral wool is required. Ideal for cleanrooms, hospitals, and allergy sufferers.
Transparent acoustics
The HSA3 can be made from transparent acrylic glass . Window surfaces become acoustically active without obstructing the view.
- Broadband effect: High efficiency across a wide frequency range despite minimal hole area.
- Thermal efficiency: Without insulating fleeces, the cavity remains optimally usable for thermal component activation (heating/cooling).
- Material variety: Since the function is based on geometry, a wide variety of material combinations are possible.
With the HSA3, you are choosing a solution that combines scientific excellence with the highest aesthetic and hygienic freedom.