Fiber optic probes provide efficient diagnostic and sensing

Fiber optic probes are used as fiber sensors for minimally invasive measurements into the human body for a long time. To be more precise, an optical fiber sensor is considered to be a special device that allows transforming an input parameter or measurand into another parameter known as the signal. For example, it is possible to convert a pressure signal into a light intensity change by a displacement membrane on the tip of a fiber optic probe.

The thing is that efficient sensing systems are required to have the ability to choose one parameter without interference from the other parameters, such optical fiber qualities as high sensitivity, precision or closeness to the current measurement, and quite a low cost. Therefore, optical fibers must compensate these parameters within some limits. Fiber probes provide the potential to comply with the mentioned sensor requirements such as miniaturization, perfect biocompatibility, speed, and safety. 

The principle of fiber optic probe operation is based on the light transmission into the body that directly or indirectly interacts with the required biological parameters. As a result of such interactions, a change in the laser beam occurs. The application of fiber probes in optical fiber sensors includes both chemically and physically-based measurements. All fiber optic probes are distinguished on direct and indirect sensors.

Compared to indirect probes, in direct fiber probes, the light interacts directly with the sample. For example, fiber optic probes allow performing measurements of such things as blood oxygenation, quantifying blood analytes with either two side-firing fiber probes separated at a fixed distance resulting in fiber optic bundles that can be applied to transmit and receive light to and from tissue to differentiate between normal and cancerous or precancerous lesions. 

The operation of indirect fiber optic probes includes a tiny transducer that is installed to the distal end of the optical fiber so the light interacts with this transducer and the transducer, in its turn,  interacts with the sample. Fiber probes can be applied to control pressure or temperature changes by simply exciting less light to be specularly reflected into the optical fiber as the tip is moved. 

The advantages of fiber optic probes are the following:

  •  The design of fiber probes makes them cleanable in processes where probe optics can be contaminated by media;
  • The fiber optic probes are allowed to be retracted, cleaned and calibrated during a chemical process, which makes it possible to remote process-control in any liquid, gas or solid mixtures under harsh environmental conditions;
  • The fiber probes facilitate qualitative and quantitative product analysis, makes the detection of specific chemical and physical properties possible.

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 optical fiber products, please contact us at

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