Optics: measuring and testing – Lamp beam direction or pattern
Patent
1977-08-24
1979-07-10
Corbin, John K.
Optics: measuring and testing
Lamp beam direction or pattern
350269, G01J 100
Patent
active
041605985
ABSTRACT:
The light power not occluded during a repetitive, transverse knife-edge scanning of a focused spot is measured by a photodetector while an interferometer measures the displacement of the knife-edge during the scanning operation. The knife-edge is supported on a glass plate carried by the photodetector with a liquid medium being located between the glass plate and the light sensitive surface of the photodetector to enhance light reception by the photodetector. The differentiated output of the photodetector when displayed (e.g., by means of an oscilloscope) provides a graphic representation of the intensity profile of the spot which is dependent on the composite refractive index of the glass plate and the liquid medium. The output of the interferometer when displayed along with the intensity profile of the spot provides a known quantity with reference to which spot diameter as a function of the composite refractive index can be accurately determined to within 1/8 of a wavelength of the light provided for the measurements of the interferometer.
REFERENCES:
patent: 3612885 (1971-10-01), Arnaud
patent: 3894804 (1975-07-01), Detwiler et al.
Gorog et al., "Information Scanning Technology: Applications of CW AlGaAs Injection Lasers;" Applied Optics; Jun. 1976, vol. 15, pp. 1425-1431.
Firester et al., "Knife-Edge Scanning Measurements of Subwavelength Focused Light Beams;" Applied Optics, Jul. 1977, vol. 16, pp. 1971-1974.
Firester Arthur H.
Heller Macy E.
Corbin John K.
Meagher W. H.
RCA Corporation
Rosenberger R. A.
Whitacre Eugene M.
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