Company Filing History:
Years Active: 2014
Title: Norbert L Johnson - Innovator in Retroreflectance Measurement
Introduction
Norbert L Johnson is a notable inventor based in Saint Paul, MN (US). He has made significant contributions to the field of optical measurement, particularly through his innovative patent related to retroreflectance.
Latest Patents
Johnson holds a patent for an "Apparatus for measuring the retroreflectance of materials." This invention comprises various embodiments of a retroreflectometer capable of measuring the retroreflectance of a material. The retroreflectometer includes an illumination path and a retroreflection path. The illumination path consists of focusing optics, a source aperture, a beamsplitter, and a collimating lens. The retroreflection path features a focusing lens, a beamsplitter, a receiver aperture, and a receiver. The source aperture shapes the transverse profile of the light to make it suitable for measurement. Focusing optics, such as a biconvex lens, may be placed between the light source and the source aperture. After the beam is reflected by the object under test, it enters the retroreflection path of the instrument. The focusing lens directs the light through the beamsplitter and onto the receiver aperture. The receiver aperture may serve as the input slit for a spectrometer, or there may be optics, such as a lens or an optical fiber, that transfer the light from the aperture to the receiver. Various embodiments of the invention may utilize a photopically corrected detector, multiple detectors with filters, or a spectrometer as the receiver.
Career Highlights
Norbert L Johnson is associated with Gamma Scientific Inc., where he has applied his expertise in optical measurement technologies. His work has contributed to advancements in the field, particularly in the accurate measurement of retroreflectance.
Collaborations
Johnson has collaborated with Stephen K Eckhardt, further enhancing the innovative efforts within his field.
Conclusion
Norbert L Johnson's contributions to the measurement of retroreflectance through his patented invention highlight his role as a significant innovator in optical technologies. His work continues to influence advancements in the field.