PH measurement utilizing a light source

Details PH measurement utilizing a light source PH measurement utilizing a light source

1996-06-07

1998-01-13

Porta, David P.

Radiant energy

Luminophor irradiation

With ultraviolet source

2502521A, 162 49, G01N 2164

Patent

active

057082758

ABSTRACT:
The pH of a material containing lignin is determined by directing an ultraviolet light at the material. One of the characteristics of lignin is giving off a fluorescence in response to an ultraviolet light. A monochrometer is used to observe the fluorescence and produces a signal of the intensity of the fluorescent light at varying wavelengths. This signal is displayed on a display means such as a computer screen. Calibration occurs before the pH measurement of the material occurs. The calibration data along with information from the signal is used to calculate the pH of the material. No contact with the material is required in determining the pH of the material.

REFERENCES:
patent: 5220172 (1993-06-01), Berthold et al.
patent: 5456252 (1995-10-01), Vari et al.
patent: 5486915 (1996-01-01), Jeffers et al.

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