A ferrofluid mirror is a type of deformable mirror with a reflective liquid surface, commonly used in adaptive optics. It is made of ferrofluid and magnetic iron particles in ethylene glycol, the basis of automotive antifreeze. The ferrofluid mirror changes shape instantly when a magnetic field is applied. As the ferromagnetic particles align with the magnetic field, the liquid becomes magnetized and its surface acquires a shape governed by the equilibrium between the magnetic, gravitational and surface tension forces. Since any shapes can be produced by changing the magnetic field geometries, wavefront control and correction can be achieved.
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| - مرآة السوائل الممغنطة (ar)
- Ferrofluid mirror (en)
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| - مرآة السوائل الممغنطة (بالأنكليزية:Ferrofluid mirror) تستخدم مرايا السوائل الممغنطة عادة في البصريات التكيفية كمرآة تشوه. وهي مصنوعة من سوائل ممغنطة يستخدم الكهربائي لتغيير شكلها. (ar)
- A ferrofluid mirror is a type of deformable mirror with a reflective liquid surface, commonly used in adaptive optics. It is made of ferrofluid and magnetic iron particles in ethylene glycol, the basis of automotive antifreeze. The ferrofluid mirror changes shape instantly when a magnetic field is applied. As the ferromagnetic particles align with the magnetic field, the liquid becomes magnetized and its surface acquires a shape governed by the equilibrium between the magnetic, gravitational and surface tension forces. Since any shapes can be produced by changing the magnetic field geometries, wavefront control and correction can be achieved. (en)
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| - مرآة السوائل الممغنطة (بالأنكليزية:Ferrofluid mirror) تستخدم مرايا السوائل الممغنطة عادة في البصريات التكيفية كمرآة تشوه. وهي مصنوعة من سوائل ممغنطة يستخدم الكهربائي لتغيير شكلها. (ar)
- A ferrofluid mirror is a type of deformable mirror with a reflective liquid surface, commonly used in adaptive optics. It is made of ferrofluid and magnetic iron particles in ethylene glycol, the basis of automotive antifreeze. The ferrofluid mirror changes shape instantly when a magnetic field is applied. As the ferromagnetic particles align with the magnetic field, the liquid becomes magnetized and its surface acquires a shape governed by the equilibrium between the magnetic, gravitational and surface tension forces. Since any shapes can be produced by changing the magnetic field geometries, wavefront control and correction can be achieved. A ferrofluid mirror is controlled by a number of actuators, often arranged in a hexagonal array. Pure ferrofluids have low reflectivity, so they must be coated with a reflective layer. Water-based ferrofluids hold the reflective layer effectively, but water evaporates so quickly that the mirror could disappear within hours. Depositing a thin silver colloid known as a metal liquid-like film (MELLF) on the ferrofluid surface solves the problem of fast evaporation and low reflectivity of pure ferrofluids. The combination of fluid and metal results in a liquid optical surface that can be precisely shaped in a magnetic field. (en)
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