Instead of the Rochonprisms of the Hardy's recording spectrophotometer, we applied an advanced sector photometer for our recording spectrophotometre for the ultraviolet and visible regions. Similar to the case of the ordinary rotating sector photometer for the photographic photometriess, the photoelectric sector photometer, whose relative exposure times for the sample and the standard material are able to control, warks with higher accuracy than that of the photographic measurements. But it is usable only when some adequate designs are adopted.
If we take an exposure figure for the flicker cycle as follows:-one cycle corresponds to 2π; the standard material, whose reflectance is R
1, is irradiated from-
π/
2-α to-
π/
2+α; an unkown sample, whose reflectance is R
2, is irradiated from+
π/
2-β to-
π/
2+β; variing α values, where α+β must be
π/
2, observe the amplitude of the alternating photocurrent of the fundamental cycles, then an αvalue, where the signal disappears, will be found, and the R
2 value can be caluclarated from the equation R
2/R
1=tanα
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