What is the FWHM of the channels? What is the smile of the camera?
The FWHM (Full Width at Half Maximum) of the ULTRIS X20 is designed to be 10 nm for every channel in the 350-1000 nm range. As shown in the image (FWHM), the design is met in practice, even across the entire image area of the camera. The peak positions can be determined more precisely than the sampling interval of the camera indicates. Using a weighted peak position, we find the maximum of the 532 nm laser radiation at 531.09 nm.
The spectral filters of the ULTRIS X20 are produced linearly. Each channel is separated by 10 nm and offers a 10 nm FWHM (see Figure “Filter Positions”). Therefore, the results in other channels are similar to the given example at 532 nm.
Summary
The ULTRIS X20 has unprecedented wavelength accuracy across all channels and locations in the image. For the user, the system has a negligible amount of smile (below 1 nm). This is made possible by the physically easy-to-understand working principle of the device and our extensive calibration (patent pending). In this calibration, each individual pixel in the 20 MP array is calibrated for its precise central wavelength position with a monochromatic measurement from 300-1000 nm.
About the Author
Dr. René Heine is the Co-Founder and CEO of Cubert GmbH, a leader in real-time spectral imaging. Since founding the company in 2012, René has been instrumental in shaping Cubert’s technological direction and growth. He holds a Doctor of Physics degree from the University of Ulm, where he graduated magna cum laude, and completed his diploma thesis at Harvard Medical School. René’s deep expertise in physics and his vision for cutting-edge imaging technologies drive Cubert’s innovations and advancements in hyperspectral solutions.
