Abstract
The principle of this sensor function is based on polarization maintaining fiber (PMF) sensi- tivity during excitation of both two polarization modes. This excitation is caused by temperature change, when absorbing thermal radiation. This mechanism is used for detection of temperature field disturbance as an in- dicator. In the case described below, attention was de- voted to temperature field disturbance on the part of the human body. Thus, this sensor system could be used for protection of some entity. The aim of this study was to determine the sensitivity of PMF to radiating heat, the space configuration and time response.
Highlights
The thermal body is simulated by a plastic basin with warm water
At an excitation of both polarization axes, when the light propagates through the fiber, the phase shift happens between these axes
The phase shift is dependent on temperature and is dependent on incident thermal radiation and is dependent on change of the polarization state along the fiber as well
Summary
The thermal body is simulated by a plastic basin with warm water This arrangement enables changes in the test water temperature, basin bottom distance from the fiber and the number of exposed fiber segments. In the case more fiber segments are exposed, and two plastic basins are used. At an excitation of both polarization axes, when the light propagates through the fiber, the phase shift happens between these axes. The phase shift is dependent on temperature and is dependent on incident thermal radiation and is dependent on change of the polarization state along the fiber as well. This phase shift can be evaluated by polarizer (analyzer). Previous experiments [1], [2] showed, that the most suitable fiber, from the sensitivity point of view, Fig. 1: The arrangement of fiber sensor model
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