Reduction of the Stray Light in Polycrometer for UV Spectral Radiation Measurement(<Feature>Industrial Applications of Optical Radiation)

Abstract

The polychromator which combined the single diffraction grating and the optical detector array has spread through lighting and the light source field by using spectrometry as the equipment which can be performed easily. However, stray light reduction which occurs from structure in a UV wavelength region was a subject. Especially measurement accuracy was not acquired when spectrometry in UV region, such as evaluation of the actinic UV hazard for skin and eye for the light source, was performed especially. Since the measurement light of the cause itself is weak in an ultraviolet region compared with a visible and infrared radiation, the influence of the stray light becomes large and it is because ultraviolet spectrometry accuracy falls. The technology of stray light reduction of a polychromator is introduced in this paper. It is the technology of using the optical feature of the polychromator that special distribution of the stray light in the spectrometer does not change, and aiming at stray light reduction by considering a part of optical ditector array as a stray light monitor.