CRCU

Chemical Research in Chinese Universities ›› 2009, Vol. 25 ›› Issue (5): 624-627.

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High Sensitive Long Period Fiber Grating Sensor for Detection of Nitrite

QIAN Ying1*, YU Yong-sen1, LI Qiu-shun2, WU Si-zhu1, ZHAO Kai-jun3*, YANG Bai-liang1 and ZHANG Yu-shu1   

  1. 1. State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering,
    2. College of Chemistry, Jilin University, Changchun 130012, P. R. China;
    3. Electrical Diagnosis Division, China-Japan Union Hospital, Jilin University, Changchun 130033, P. R. China
  • Received:2009-01-16 Revised:2009-02-16 Online:2009-09-25 Published:2009-12-07
  • Supported by:

    Supported by the National Natural Science Foundation of China(Nos.60707016 and 60807030).

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Abstract:

A high sensitive long period fiber grating(LPFG) sensor for the detection of nitrite is proposed, which is realized by coating multiple poly(sodium 4-styrensulfonate)(PSS) and poly(diallyldimethylammonium) chloride (PDDA) layers on the fiber grating surface. The sensitivity of this LPFG sensor is maximum when the number of assembled layers is 70. Under this condition, a nitrite concentration of 3×10–3 mol/L, which is lower than the National Food Additive Standard, 4.2×10–3 mol/L, can be distinguished. The sensitivity is further increased by 30% when nitrite was determined in the sucrose solution with a concentration of 65%, which provides a new solution for the best refraction index approaching matched index of the fiber cladding. Compared with chemical methods, this nitrite detection technology offers some advantages, such as high accuracy, non toxicity, high speed, low cost, without chemical reagent, and is suitable for foodstuff security detection.

Key words: Long period fiber gratings; Refractive index sensor; Detection of nitrite