G - Physics – 01 – J
Patent
G - Physics
01
J
73/55, 340/136.2
G01J 3/12 (2006.01)
Patent
CA 1042681
ABSTRACT OF THE DISCLOSURE A reading device for mo?ochromatic having an outlet slit of adjustable width and a light dispersing element which is adjustable in relation to the outlet slit to shi? the spectrum in relation to the outlet slit, the reading device comprising a scale which is displaceable in relation to the adjustment of the light dispersing element with respect to the outlet slit and a transparent plate slidably mounted above the scale for movement in a direction perpendicular thereto. A sliding mechanism for adjusting the width of the outlet slit is connected to the plate through a suitable linkage such that the plate follows the move- ment of the adjustment of the width of the outlet slit. A system of pairs of curved lines are formed on the plate and the lines have curvatures such that at a determined position of the light dispersion element and a determined width of the slit they intersect the scale at points characteriz- ing a monochromatic spectrum transmittance curve. A light dividing element is disposed above the plate to receive an image thereof and to pass the same successively through a lens and a mask to a photo-detector.
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