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提出了一种用计算机实现的光纤 Bragg光栅反射波长移位的探测方法。由计算机经 D/ A转换器产生一个扫描三角波 ,驱动 PZT周期拉伸参考光纤光栅。当参考光纤光栅栅距与传感光纤光栅栅距匹配时 ,探测器输出峰值 ,由此可测得传感光纤光栅反射波长移位。实验表明 ,该方法可构成柔性实验系统 ,具有波长移位探测精度高 ,线性度好 ,易操作等优点。
A method of detecting wavelength shift of fiber Bragg grating by computer is proposed. By the computer through the D / A converter to generate a triangular wave scanning, drive PZT cycle stretch reference fiber grating. When the pitch of the reference fiber grating matches the grating pitch of the sensing fiber grating, the detector outputs a peak value, from which the reflection wavelength shift of the sensing fiber grating can be measured. Experiments show that this method can form a flexible experimental system, with the advantages of high precision of wavelength shift detection, good linearity and easy operation.