A novel coherent optical fiber sensor for nonincremental measurements of phase-conveyed information is reported. When the frequency of a laser source is sinusoidally modulated, a nonincremental measurement can be processed with the same frequency-demodulation treatment as used for an incremental one. This method is applied to a polarimetric fiber-optic sensor to obtain the absolute temperature measurement in the range of 20–100°C. A rotating half-wave plate gives the polarimetric setup the frequency carrier essential for the demodulation process. Experimental data confirming the theoretical predictions are reported together with the measured sensitivity values.
Nonincremental coherent optical fiber sensor
MARTINELLI, MARIO;
1988-01-01
Abstract
A novel coherent optical fiber sensor for nonincremental measurements of phase-conveyed information is reported. When the frequency of a laser source is sinusoidally modulated, a nonincremental measurement can be processed with the same frequency-demodulation treatment as used for an incremental one. This method is applied to a polarimetric fiber-optic sensor to obtain the absolute temperature measurement in the range of 20–100°C. A rotating half-wave plate gives the polarimetric setup the frequency carrier essential for the demodulation process. Experimental data confirming the theoretical predictions are reported together with the measured sensitivity values.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
