Fiber optic probes for MIR spectroscopy

Nowadays optical fiber systems based on fiber optic probes for chemical sensing become more and more accessible since they offer a wide range of applications. Techniques based on fiber optic technology are quantitative which means the opportunity to be calibrated almost in all cases. Herewith, such features of optical fibers as the flexibility and the measurement ability in situations, where taking a sample is not possible, make fiber probes a very powerful sensing device to analytical chemists.

The chemical sensing process is considered to be the first commercial application of mid-infrared transmitting optical fibers. The thing is that a pretty low cost of chalcogenide glass optical fiber with losses of less than 1 dB m1 over most of the spectral range opens new opportunities for the development of commercially viable fiber sensing systems employing mid-infrared fiber-optics.

Thus, fiber optic probes for MIR spectroscopy allows “taking the spectrometer to the sample”, compared to conventional techniques of taking the sample to the spectrometer. Therefore, the opportunity to install fiber probes in reaction flasks or reactors has caused the development of a new paradigm for molecular spectroscopy.

The application of fiber optic probes includes their use daily in university laboratories, for industrial process development, and in industrial quality control laboratories. Such fiber probes offer very important data information that is not always accessible by any other sensing technique. Moreover, it is possible to design optical fiber sensors using any of the 5 basic sensing schemes that include “transmission, reflection, grazing angle reflection, attenuated total reflection (ATR probes), and a variant on the ATR effect known as the fiber evanescent wave sensor.”

The operation of MIR fiber optic systems is based on the overall optical signal level and the magnitude of the chemical signature. The first IR fiber optic probe is regarded as an ATR probe for monitoring dye synthesis reactions. ATR probes are fiber optic devices applied in MIR spectroscopy because of the extremely high level of extinction coefficients and too short path lengths of transmission cells required for practical use. 

Modern fiber optic probes for MIR spectroscopy are gaining acceptance as highly convenient and useful devices for chemical sensing in a great variety of applications. Fiber optic technology enables us to perform numerous measurements that would otherwise be unpractical, and the high level of fiber sensing systems allows nonspectroscopists to use the fiber probes in routine laboratory environments.

Optromix is a provider of top quality special fibers and broad spectra optical fiber solutions. The company delivers the best quality special fibers and fiber cables, fiber optic bundles, spectroscopy fiber optic probes, probe couplers and accessories for process spectroscopy to clients. If you have any questions or would like to buy fiber optic ATR probes, please contact us at

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