Photochemical etching of filters for effective light and sound control
Karl Martinson, Director of Business Development for North America, MICROMETAL ETCHING GROUPThis article highlights how the properties of micrometal’s photochemical etching (PCE) process enable the production of very thin metal filters with hole geometries that can vary within a single pattern. Such filters can be produced for a wide range of applications in light and sound control.
Light control
Controlling light transmission and attenuation, especially angle-dependent, can be challenging depending on size constraints and available space. Our PCE process can be used to produce very thin metal plates that transmit, attenuate, block, and even focus or redirect light – depending on the angle of incidence, and all without moving parts or energy consumption. Light transmission of up to 90 percent and near-complete attenuation can be achieved within the same plate, and creative design options enable unique manipulation of light.
Thin filters with differently angled, shaped, and arranged openings, manufactured using PCE, offer solutions for advanced light control. The ability to create openings with multiple geometries and angles within a single pattern or array on a plate allows complex and highly specific manipulation of light. For example, different hole angles can affect the directional dependence of light, allowing beams to be selectively blocked, refracted, or reflected. Furthermore, different hole shapes and patterns can control the intensity, scattering, and distribution of transmitted light. A clear example is the lamination of such plates onto or into window glass, allowing sunlight to be blocked during peak times and transmitted at other times – reducing heating and cooling costs.
These filters can also be used in optical systems, displays, or advanced lighting solutions to enable customized lighting profiles, precise beam shaping, and controlled light scattering. The ability to combine different hole shapes and angles within a pattern can also be crucial in applications such as spectrometry, where light must be split into its individual wavelengths in specific patterns …
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