Abstract
We propose and experimentally demonstrate a demodulation technique for real-Time monitoring the change process of liquid concentration based on a tilted fiber Bragg grating (TFBG) and differential amplification detection. Continuous variations of the TFBG transmission power are measured by using two photodiodes (or a precision reference voltage generator instead of the referenced photodiode) along with two integrated operational amplifier circuits (IOAC). The voltage-concentration curves are obtained, by recording the output voltages of the two IOACs at different time. The experimental results show that such a fast demodulation technique is capable of measuring the effective glycerol solution concentration over the range of about 89%-69%.
Original language | English |
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Pages (from-to) | 15347-15352 |
Number of pages | 6 |
Journal | Optics Express |
Volume | 20 |
Issue number | 14 |
DOIs | |
State | Published - 2 Jul 2012 |