Critical angle refractometer for measuring refractive index...

Details Critical angle refractometer for measuring refractive index... Critical angle refractometer for measuring refractive index...

G - Physics

01

N

G01N 21/84 (2006.01)

Patent

CA 2054887

72359-4 ABSTRACT A high precision linear solid state opto-electronic critical angle refractometer which is adapted to continuously measure the refractive index of a liquid over a narrow range of refractive indices when immersed into liquid being measured. The device is adapted for use in both industrial and oceanic remote sensing applications. The device is compact and is comprised of a broad beam monochromatic infra-red semiconductor light source, a planar prism with one measuring plane and a reflective plane per- pendicular to the measuring surface, and a small aperture semi- conductor light detector shielded by an infra-red band-pass optical filter. The device is capable of measuring small changes in refractive index linearly with resolutions of 1 ppm or better and can be manually adjusted to measure bands of refractive index contained within a wide range of indices.

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