Optical pH sensor for the alkaline region

Blue, Robert and Stewart, G. (1997) Optical pH sensor for the alkaline region. Electronics Letters, 33 (6). 526 - 528. (https://doi.org/10.1049/el:19970321)

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An optical sensor incorporating near infrared opto-electronics which measures pH in the alkaline region is reported. Contaminants within the aqueous solutions whose pH is being measured interfered with the evanescent wave sensing technique and a method to overcome this problem is demonstrated.