Apparatus for measuring refractive index of medium using light,

Details Apparatus for measuring refractive index of medium using light, Apparatus for measuring refractive index of medium using light,

1995-12-19

1998-06-16

Turner, Samuel A.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

356361, 356349, G01B 902

Patent

active

057679711

ABSTRACT:
A second harmonic generation (SHG) device is used for conversion of wavelength. The direction of polarization of light beams is suitably rotated by a direction-of-polarization rotating unit, for example by 45.degree., and thereafter these light beams are guided into the SHG device. This can minimize attenuation of intensity of light beam due to conversion of wavelength. Hence, using this direction-of-polarization rotating unit in the apparatus for measuring the medium, the intensity of light being incident upon the photodetector can be increased, whereby the refractive index of the medium can be measured more accurately than by the conventional apparatus.

REFERENCES:
patent: 3399591 (1968-09-01), Drougard et al.
patent: 4948254 (1990-08-01), Ishida
patent: 5404222 (1995-04-01), Lis

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