Photometrical Measurements And Manual for the General Practice of Photometry; With Especial Reference to the Photometry of Arc And Incandescent Lamps
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± 0.25 VARIOUS PHOTOMETERS AND PHOTOMETRICAL DEVICES 89. The dispersion lens. — A concave lens placed in the path of the light from a source will disperse it over an increased surface', whose ratio of increase of area over that which would have been covered by the unobstructed light is determined by the radius of curvature of the lens. The intensity of the resulting illumination will vary inversely with the amount of the dispersion.
The method is apparently a simple one and of value in photomet...rical measurements, but in practice several sources of error have proven the method an unsatisfactory one. Except for purposes of investigation, it is now seldom employed, and its lessened importance does not warrant a full discussion of its theory in this connection. Absorption plates, and especially the revolving sector, are more suitable and practical means for diminishing the intensity of the radiations from a light source.
The objections to the use of the dispersion lens arise from reflection of light at the surface, spherical aberration, and absorption by the glass.
What to read after Photometrical Measurements And Manual for the General Practice of Photometry; With Especial Reference to the Photometry of Arc And Incandescent Lamps?
You can find similar books in the "Read Also" column, or choose other free books by Stine, Wilbur M. (Wilbur Morris), B. 1863 to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
± 0.25 VARIOUS PHOTOMETERS AND PHOTOMETRICAL DEVICES 89. The dispersion lens. — A concave lens placed in the path of the light from a source will disperse it over an increased surface', whose ratio of increase of area over that which would have been covered by the unobstructed light is determined by the radius of curvature of the lens. The intensity of the resulting illumination will vary inversely with the amount of the dispersion.
The method is apparently a simple one and of value in photomet...rical measurements, but in practice several sources of error have proven the method an unsatisfactory one. Except for purposes of investigation, it is now seldom employed, and its lessened importance does not warrant a full discussion of its theory in this connection. Absorption plates, and especially the revolving sector, are more suitable and practical means for diminishing the intensity of the radiations from a light source.
The objections to the use of the dispersion lens arise from reflection of light at the surface, spherical aberration, and absorption by the glass.
What to read after Photometrical Measurements And Manual for the General Practice of Photometry; With Especial Reference to the Photometry of Arc And Incandescent Lamps?
You can find similar books in the "Read Also" column, or choose other free books by Stine, Wilbur M. (Wilbur Morris), B. 1863 to read onlineMoreLess
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