This work fabricates and demonstrates a temperature sensor with high sensitivity and an expanded measuring range based on the microfiber knot resonator.Multiple-modes are generated in the microfiber knot resonator and participate in the resonance.The spectra of multiple mode resonance is superimposed on each other to form a vernier spectrum with envelope.By extracting the envelope of the vernier spectrum,high-sensitivity temperature measurement can be achieved with the sensitivity of up to-10 nm/℃.However,the temperature measurement range using the vernier spectrum is calculated to be only about 4℃.To solve the problem of too small measurement range,the envelope spectrum and single frequency component spectrum are combined to expand the measurement range to about 20℃.Compared with the resonance spectrum corresponding to the single frequency component,the vernier envelope spectrum achieves an amplification of sensitivity of about 1 600 times.This scheme uses the vernier effect to improve the sensitivity of temperature measurement.Meanwhile,the temperature measuring range of the vernier spectrum is expanded by using the resonant spectrum corresponding to a single frequency component,which improves the performance and practicability of the sensor.
关键词
光纤传感器/微纳光纤谐振环/游标光谱/温度测量/高灵敏度/测量范围扩展
Key words
optical fiber sensor/microfiber resonator/vernier spectrum/temperature measurement/high sensitivity/measurement range expanding
维普
万方数据