Optical null apparatus

Details Optical null apparatus Optical null apparatus

1975-06-16

1976-08-17

Smith, Alfred E.

Optics: measuring and testing

Range or remote distance finding

With photodetection

250343, 350266, 350273, 356 51, G01N 2134, G01J 342, G05D 2500

Patent

active

039750990

ABSTRACT:
A correction system is disclosed for double-beam spectrophotometers of the optical nulling type in which a mechanical radiation attenuator is positionally adjusted in the path of the reference beam by means of an error signal proportional to the detected difference in intensity and between the sample and reference beams. The attenuator takes the form of a circular sector mounted for angular displacement about an axis through the sector circle center by a servomotor in response to the error signal. The sector contains one or more wedge-shaped apertures arcuately disposed about said center so that the reference beam passes through the apertures and is partially (or totally) occluded in accordance with the angular position of the sector. In order to correct for quadratic non-linearities in the instrument output, a generally sinusoidal correction factor is mechanically superimposed on the instrument's measuring characteristic by enabling adjustable displacement of the servomotor rotational drive axis from alignment with said axis of rotation of the circular sector.

REFERENCES:
patent: 3013470 (1961-12-01), Pliskin
patent: 3347616 (1967-10-01), Mori et al.

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