Application of Centroid Principle to Wavelength Demodulation of Fiber Grating Sensors
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摘要: 在光纖光柵傳感懸臂梁調諧濾波技術中,峰值法進行波長檢測誤差大,精度低,測量結果不穩定.針對峰值法的不足提出了一種質心原理方法.該方法利用掃描的光強分布圖形的質心檢測光纖光柵的波長變化,與傳統的峰值法相比可使檢測精度提高70倍,大大降低了波長檢測誤差.Abstract: Among the tunable filter technologies of optical fiber grating sensors, the peak method is an usual way, but it has poor precision and the result is unstable. A centroid principle method was proposed, which used the detection of wavelength variation by the centroid of scanned light intensity distribution curves. Compared with the peak method, the accuracy is improved 70 times and the error of the wavelength detection decreases greatly.
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Key words:
- centroid principle /
- wavelength demodulation /
- fiber grating
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