The Fiber-Optic Photothermal Interferometric Sensor (FOPIS): A novel technique for chemical measurements. Balconi L., Martinelli, M., Sigon, F., & Vegetti, G. Process Control and Quality, 3(1-4):107-114, 1992.
The Fiber-Optic Photothermal Interferometric Sensor (FOPIS): A novel technique for chemical measurements [link]Website  abstract   bibtex   
Corrosion, scaling and deposition effects in the water-steam side represent a cause of unavailability in electric power plants. Cycle chemistry control is essential in order to prevent or eliminate them. The aim of this communication is to present an original fiber-optic sensor approach to the detection of chemical species in aqueous solution, for process fluid monitoring. The working principle of the sensor relies on Interferometric Photothermal Spectroscopy. Presence of an analyte in the process fluid causes absorption of light at a specific wavelength, transmitted by an appropriate fiber-optic cable. The subsequent thermal decay induces an optical path change in the fluid, which is detected by an advanced fiber-optic interferometric probe. Therefore, the chemical sensor head is completely fiber-optics based, and can be differently configured to the specific monitoring needs (analyte, concentration range, chemical-physical parameters) while maintaining its characteristics of low-invasivity, chemical inertness and e.m. safety. An example of laboratory detection of Fe ions in typical process fluid concentrations is given. The sensor may constitute the basis for the development of a photonic chemical sensing network. © 1992.
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 title = {The Fiber-Optic Photothermal Interferometric Sensor (FOPIS): A novel technique for chemical measurements},
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 year = {1992},
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 keywords = {Chemical analysis,Corrosion,Fiber optic sensors,Fibre Optics,Flow injection analysis,Interferometric,Interferometric photothe,Photothe,Spectroscopy},
 pages = {107-114},
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 abstract = {Corrosion, scaling and deposition effects in the water-steam side represent a cause of unavailability in electric power plants. Cycle chemistry control is essential in order to prevent or eliminate them. The aim of this communication is to present an original fiber-optic sensor approach to the detection of chemical species in aqueous solution, for process fluid monitoring. The working principle of the sensor relies on Interferometric Photothermal Spectroscopy. Presence of an analyte in the process fluid causes absorption of light at a specific wavelength, transmitted by an appropriate fiber-optic cable. The subsequent thermal decay induces an optical path change in the fluid, which is detected by an advanced fiber-optic interferometric probe. Therefore, the chemical sensor head is completely fiber-optics based, and can be differently configured to the specific monitoring needs (analyte, concentration range, chemical-physical parameters) while maintaining its characteristics of low-invasivity, chemical inertness and e.m. safety. An example of laboratory detection of Fe ions in typical process fluid concentrations is given. The sensor may constitute the basis for the development of a photonic chemical sensing network. © 1992.},
 bibtype = {article},
 author = {Balconi L., undefined and Martinelli, Mario and Sigon, F and Vegetti, G},
 journal = {Process Control and Quality},
 number = {1-4}
}
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