Fiber-optic pH meter using NIR dye
| Autor: | Peter Dr. Czerney, H. Lehmann, G. Schwotzer, Gerhard J. Mohr |
|---|---|
| Rok vydání: | 1995 |
| Předmět: |
Optical fiber
business.industry Metals and Alloys Photometer Condensed Matter Physics Laser Glass electrode pH meter Surfaces Coatings and Films Electronic Optical and Magnetic Materials law.invention chemistry.chemical_compound Optics chemistry law Materials Chemistry Electrical and Electronic Engineering Optode Absorption (electromagnetic radiation) business Instrumentation Acid dye |
| Zdroj: | Sensors and Actuators B: Chemical. 29:392-400 |
| ISSN: | 0925-4005 |
| DOI: | 10.1016/0925-4005(95)01713-5 |
| Popis: | An absorption-based, fiber-optic pH meter for the physiological pH range is presented. It employs a sensor membrane based on a NIR proton-carrier dye and laser diodes as light sources. It is shown that an optical absorption sensor with a sensor dye placed on the tip of a bifucated fiber requires special provisions to receive sufficient light back from the sensor head to the detector. With respect to available cheap and intensive light sources in the NIR, it is advantageous to use NIR dyes for chemical sensor membranes. A new type of acidochrome dye immobilized in a PVC matrix is presented for use with a two-wavelength, single-beam fiber-optic photometer. The scopes and limitations of the optical design of this photometer are discussed. pH values measured with the fiber-optic pH meter are compared with the results obtained with a glass electrode. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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