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Abstract
The paper deals with the overview of fiber optic methods suitable for temperature measurement and monitoring. The aim is to evaluate the current research of temperature measurements in the interval from temperature close to 0 up to 1000°C. Since the measuring chain is a functional combination of optical methods, optical fiber properties, and other photonic elements together with control electronic circuits, it is necessary to find a suitable compromise between the chosen measurement method, measuring range, accuracy, and resolution. Optical fiber sensors can be used in cases where standard electrical measurement methods cannot be used. These may be areas with high electrical and magnetic interference or critical areas. Therefore, there is intensive development of optical and fiber optic methods based on blackbody and greybody radiation, luminescence, fiber Bragg gratings (FBGs), and interferometers.
Highlights
At present, many fundamentally different ways of measuring high temperatures are used
The blackbody measurement method is suitable because of its simplicity since it requires only a fiber and a suitable photodetector. The pitfall of this method lies in the measuring range and accuracy that can be measured by this method; it is suitable for measuring temperatures from 300°C to temperatures which depend on the softening or melting temperature of the deployed optical fiber, which may be up to 2000°C
This disadvantage can be overcome by using wider spectrum sources, where the magnitude of the spectral shift of light reflected by the fiber Bragg gratings (FBGs) is usually evaluated
Summary
Many fundamentally different ways of measuring high temperatures are used. One of the primary users of temperature measurements is the automotive industry. There are a number of areas where it is necessary to measure or at least monitor this high temperature directly. These are, in particular, points in the exhaust pipe, near catalytic converters, or turbochargers. An example of temperature measurement using optical methods is dealt with in the article from Bock et al [1]. Another article from Jiang et al is about a temperature fiber sensor for the aviation industry [2]
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