Prof. Steffen Reichel
Professor at Hochschule Pforzheim
SPIE Involvement:
Author | Instructor
Area of Expertise:
laser amplifier , optical design , fiber optics and optical communication , optical material and filter (thin film & absorption) , diffractive optics , optical measurements
Publications (22)

Proceedings Article | 26 February 2020 Paper
Proc. SPIE. 11304, Advances in Display Technologies X
KEYWORDS: Light emitting diodes, Safety, Visualization, Calibration, Light sources and illumination, Microcontrollers, Tolerancing, Temperature metrology, RGB color model

Proceedings Article | 25 February 2020 Paper
Proc. SPIE. 11302, Light-Emitting Devices, Materials, and Applications XXIV
KEYWORDS: Visualization, Reflection, Scattering, Light scattering, Bidirectional reflectance transmission function, Light sources and illumination, Goniophotometry

Proceedings Article | 21 June 2019 Paper
Proc. SPIE. 11056, Optical Measurement Systems for Industrial Inspection XI
KEYWORDS: Light emitting diodes, LabVIEW, Sensors, Calibration, Reliability, Optical testing, Data acquisition, Integrating spheres

Proceedings Article | 5 June 2018 Paper
Proc. SPIE. 10690, Optical Design and Engineering VII
KEYWORDS: Modeling, Zemax, Microscopes, Refractive index, Glasses, Optical simulations, Wavefront distortions, Systems modeling

Proceedings Article | 5 June 2018 Paper
Proc. SPIE. 10690, Optical Design and Engineering VII
KEYWORDS: Optical components, Lenses, Glasses, Distortion, Objectives, Photographic lenses, Tolerancing, Systems modeling

Showing 5 of 22 publications
Conference Committee Involvement (2)
Illumination Optics VI
13 September 2021 | Madrid, Spain
Illumination Optics V
14 May 2018 | Frankfurt, Germany
Course Instructor
SC1286: Modern Optical Measurements: An Introduction with Practical Applications
“The best remedy against hallucination is measuring” [Plato, 427-347 B.C.]. Thus measuring is necessary to describe and quantify a physical quantity. Optical measurements require care since they can be used to characterize small distances and, hence, are sensitive to disturbances. In addition, measuring involves many hints and tricks to obtain reliable, repeatable quantities.<p> </p> This course teaches fundamentals of modern optical measurements. We begin with basics such as refractive index measurements and integrating sphere operations (infinite sum of reflected beams…). Next, measurements of external transmission, internal transmission and transmittance are explained. Afterwards a goniophotometer and an x-y stage for numerical aperture (NA) or light distribution curve and laser beam diameter measurements are shown and described. This is followed by the basics of spectral measurements—including how a monochromator works--and finally interferometric measurement techniques are explained. The course discusses how many repeated measurements are needed for reliable, statistically significant results and what statistical data should be provided to fully characterize a measurement.<p> </p> In reference to essential/relevant applications the individual advantages and drawbacks of various methods are described. Anyone faced with the question “How can I do basic optical measurements?” or “How reliable is my measurement result?” will benefit from this course. The applications section will provide best practice examples for optical measurements on LEDs, lighting and/or displays.
SC1287: Optical Measurements for (Automotive) Displays & Lighting
The move towards autonomous vehicles will be accompanied by increased use of interior displays of various form factors as well as the use of novel illumination schemes including contour lighting. The need to optimize visual ergonomics for such displays and lighting solutions requires additional, new optical measurement techniques extending the current methodologies. Given the high standards of the automotive industry, such techniques, once developed and refined, can easily map to additional applications including e-signage, the medical industry, and high volume manufacturing. <p> </p> This course provides an introduction to the fundamentals of optical measurements of displays and LED light guides including such parameters luminance, color and grey scale. Temperature, ambient light, and component aging all affect the perceived image quality. Optical measurement system layouts and methods will be presented and compared, and the impact of such measurements as they relate to human factors such as visual perception will be discussed. All measurements and methods will be taught through a strong theoretical foundation moving then to a focus on practical applications of these results. Case studies will enable interactive discussions pertinent to the student since there are often more than one solution for any given application. Anyone faced with questions such as, “How can I evaluate the optical performance of displays and interior lighting for premium applications” or “What do my measurement results imply in terms of human perception and vision” will benefit from this course.
SC1013: Choosing the Correct Optical Filter for Your Application
This course enables attendees to choose and specify the appropriate optical filter type for different applications. The physical principles of interference (multilayer thin film) and absorption (doped glass) filters are explained. Optical filters are clustered into groups according to their spectral characteristics (e.g. band pass or notch filter). The individual advantages and drawbacks of the different filter types are described across the ultraviolet, visible and infrared spectrum. Anyone who is faced with the question "what is the right filter for my application?" or "how should I specify the filter?" will benefit from this course.
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