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This work addresses a fiber optical viscosity sensor using long-period fiber grating (LPFG) with a capillary tube mechanism. As soon as the preheated 100 ml fluid reaches an LPFG, the time need was used to determine the discharge time. Thus, a noticeable amplitude change of resonance wavelength in transmission spectrum was observed. The LPFG sensor was first immersed in hot air and then in fluid and...
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