Abstract

The use of the Hunter multipurpose reflectometer for color measurement has been limited, particularly at low reflectances, by inaccuracies arising chiefly from stray light in the optical system. A baffle is described whose installation greatly reduces stray light, so that its effect may be ignored above 2 percent reflectance. A method is also described for making corrections for stray light in those cases where its effect cannot be neglected. Application of these two procedures permits the Hunter reflectometer to furnish useful data down to reflectances of 0.1 percent.

© 1950 Optical Society of America

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References

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  1. R. S. Hunter, J. Research Nat. Bur. Stand. 25, 581 (1940).
    [Crossref]

1940 (1)

R. S. Hunter, J. Research Nat. Bur. Stand. 25, 581 (1940).
[Crossref]

Hunter, R. S.

R. S. Hunter, J. Research Nat. Bur. Stand. 25, 581 (1940).
[Crossref]

J. Research Nat. Bur. Stand. (1)

R. S. Hunter, J. Research Nat. Bur. Stand. 25, 581 (1940).
[Crossref]

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Figures (2)

Fig. 1
Fig. 1

Stray-light baffle. Baffle 1 intercepts stray light from the support of comparison-beam mirror 2 and prevents stray-light from entering the measuring photo-cell tunnel 3.

Fig. 2
Fig. 2

Reduction of scale corrections by stray light elimination.

Tables (1)

Tables Icon

Table I Comparison of measured and calculated scale corrections.

Equations (5)

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i r = I and S = S b , the scale reading at balance .
S b / S = i r / I ( S b - S ) / S = - ( I - i r ) / I Δ S / S = - Δ i r / I I = S · ( - Δ i r / Δ S ) .
S t / S b = ( I - i s ) / I
( S t - S b ) / S b = - i s / I .
δ = - S b · i s / I .