SPECTROPHOTOMETRIC DEVICE

摘要

PURPOSE:To enable spectrophotometry and colorimetry with high accuracy with any light sources even if the position setting with an incident optical system is rough by combining a monochrometer and the light transmission and diffusion plate, light shielding hood and optical fiber bundle set in the size and position relation to meet the conditions of the optical system within the monochrometer. CONSTITUTION:The monochrometer 5 has an opening angle thetam from an incident slit 6 to a concave diffraction grating 7. The optical fiber bundle 3 is connected at one end to the slit 6 and is specified in diameter (d) and numerical aperture N.A. to N.A.-sin(thetam/2) or N.A.>sin(thetam/2). The milky white diffusion plate 1 having transmission and diffusion characteristics is fixed apart at the distance L of L>>d from the other end of the bundle 3 and has the diameter of D-2Ltan(thetam/2). The light shielding hood 2 shields light in the space from the diffusion plate 1 to the other end of the bundle 3. The light of a light source 8 to be measured is transmitted and diffused by the diffusion plate 1 and is projected through the bundle 3 to approximately the entire surface of the grating 7 of the meter 5.