19 January 2001 Recent developments in fiber optic IR sensors
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Abstract
Although there is an ongoing effort to use infrared- spectroscopy for tissue differentiation and classification, there is still a need for the development of a sensor for use in the quick and non-destructive detection of spectral changes resulting from, for example, the influence of temperature. It is our intention to investigate flat IR- sensors and their suitability as a tool for detection within bio-organic compounds. Initial investigations using bio- liquids, tissues in the native and coagulated state, and micro-organisms have already been carried out. According to the literature, major IR-spectroscopic differences can be expected in the fingerprint region (1500-1000 cm-1). An experimental set up was based on an FTIR-spectrometer, fiber optic cables, sensor and an external detector. A sensor was used whereby a segment of 1.5 cm at the center of the fiber was flattened to approx. 150 micrometers . Transmission spectra of flattened fibers have been compared to those of the cylindrical fibers. Spectral differences were obtained indicating a possible use for the study of thermal damage in tissues. The fiber-optic based results are comparable to micro-ATR-FTIR-spectroscopy (attenuated total reflectance) measurements. IR-sensing was performed either using circular or flat silver halide wave guides.
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Uwe Bindig, Uwe Bindig, Martina Meinke, Martina Meinke, Ingo H. Gersonde, Ingo H. Gersonde, Oded Spector, Oded Spector, Abraham Katzir, Abraham Katzir, Gerhard J. Mueller, Gerhard J. Mueller, } "Recent developments in fiber optic IR sensors", Proc. SPIE 4158, Biomonitoring and Endoscopy Technologies, (19 January 2001); doi: 10.1117/12.413807; https://doi.org/10.1117/12.413807
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