Measuring the refractive index of liquid

Details Measuring the refractive index of liquid Measuring the refractive index of liquid

1987-03-06

1989-05-30

LaRoche, Eugene R.

Optics: measuring and testing

Refraction testing

Refractive rod engages specimen

356128, 250573, G01N 2141, G01N 1506

Patent

active

048345334

ABSTRACT:
An apparatus for measuring the refractive index of liquid particularly suitable for use in an ink-jet printing system is provided. The apparatus includes a light emitting diode and a photodiode which are optically coupled by an optical fiber which in turn is partly immersed in a liquid to be measured. In one aspect, the wavelength of light emitted from the light emitting diode is so set to be outside a light absorption wavelength range of the liquid to be measured. In another aspect, provision is made of a temperature dependent resistor which changes its electrical resistance depending on the temperature of the liquid to be measured so as to vary the level of the driving current to be applied to the light emitting diode thereby varying the amount of light to be emitted.

REFERENCES:
patent: 3282149 (1966-11-01), Shaw et al.
patent: 3850528 (1974-11-01), DeBellis
patent: 3999857 (1976-12-01), David et al.
patent: 4660974 (1987-04-01), Machler et al.

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