Julius Muschaweck

How do illumination and sensing optics perform under temperature variation? Simulation software can tell us, but only if we tell the software about two key properties of the optical materials: (i) thermal expansion and (ii) refractive index change with temperature. Expansion is the easier part: We take CTE l, the linear coefficient of thermal expansion, from the data sheet and scale our optical parts accordingly. Refractive index change is more difficult: For many optical pla

Let's assume we design optics for some spotlight. Typically, the spec says e.g. "30° FWMH" and "3500 cd". When we ask for more details about the beam shape, the answer may well be "soft and nice" (rotational symmetry is assumed). That's a somewhat incomplete specification for an engineer! However, the customer is (almost) always the king, and we better be nice to the king -- for example, by proposing a precise beam shape which is, indeed, a "soft and nice" bell shape and work

We deal routinely with spectra in illumination optics. We need to analyze LED spectra, compute color coordinates and color rendering...