Refractive Index Insensitive Temperature Sensor Based on an Optical Fiber Interferometer
In this work we present an in-line fiber-optics sensor for temperature measurements. The sensing probe is a single-mode/single-mode (SM-SM) fiber configuration formed by splicing two sections of SM fibers with a lateral offset, the sensing probe is coated by the sputtering technique using gold. The measurement of the temperature is carried out by monitoring the shift of the interference pattern. This sensor configuration exhibits insensitivity to changes in the refractive index of the external medium, which broadens the range of environments in which the sensor can measure. The temperature sensitivity obtained for this configuration was 5380 nm/°C.
OBJECTIVE ::: To establish a new method to discriminate Aaron's beard by Fourier transformation infrared spectrometry. ::: ::: ::: METHODS ::: Attenuation Reflection-Fourier transformation infrared spectrometry with clustering analysis was used to the identification of Aaron's beard. ::: ::: ::: RESULTS ::: There were obvious differences in Aaron's beard. The results are consistent with that of morphologic study. ::: ::: ::: CONCLUSION ::: This method is rapid, simple and economical, and can be used to the quality control.