Stray light errors in spectral colour measurement and two rejection methods

Abstract

The measurement errors caused by stray light of array spectrometers in the spectral colour measurement for light emitting diodes (LEDs) are studied. A stray light correction method and a filter-wheel stray light blocking technology are compared both by simulation and by experiment. The results show that the stray light may cause unacceptable measurement errors. Both the correction method and the filter-wheel technology are very effective in correcting the stray light errors for all the LEDs. The correction method needs infrared filters for white LEDs. An optimized design of the filter wheel is given.

A simple method of UV stray light correction for field spectrometers in Ground Validation Sites

“…It is an efficient and accurate correction method that obtains the spectral line spread functions for every pixel by using a set of monochromatic laser sources. This method is used to correct multichannel hyperspectral spectrographs of the Marine Optical Buoy (MOBY) and other optical instruments [9][10][11]. Building on the theoretical background of Zong et al, several researchers have developed practical approaches to stray light correction.…”

Spectral stray light effect on high-temperature measurements using a near-infrared multi-wavelength pyrometer

“…Spectral stray light generally originates from radiation scattered from imperfections in the dispersing grating, filter, prism and other optical elements in the system and can cause larger errors when measuring the spectral intensities of a source with a broad-band radiation distribution. The analysis of spectral stray light has been of great concern for spectrometer applications in the fields of colorimetry, photometry and optical spectroscopy with some correction methods developed to reduce the effect of the spectral stray light [27][28][29][30][31][32][33][34][35][36][37][38].…”

Stray light correction on array spectroradiometers for optical radiation risk assessment in the workplace

“…Several stray light rejection methods have been described in scientific literature. Optical methods can be applied to suppress the stray light, blocking the unwanted light by using an optical filter wheel [16,17]. This technology is commonly used in scanning spectroradiometers.…”