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报道了一种在光纤内部通过采用157nm激光微加工一个自封闭法布里-珀罗(F-P)腔而形成的在线式全光纤标准具。实验研究了这种标准具的应变和温度特性,结果表明,在标准具两固定点相距1m的情况下,位移-相移系数和位移-谷值波长漂移系数分别为1mrad/μm和5.2pm/μm,曲线的线性度为99.92%;在18℃～500℃的温度范围内平均温度系数为0.13mrad/℃和0.64pm/℃,温度不敏感。实验证明该标准具有很好的传感特性,能满足各种应变测试的需要,如极好的条纹对比度(高达30dB)、低温度交叉敏感、大规模生产的极大潜能、低成本和耐恶劣环境能力强等。
Reported an in-line all-fiber etalon formed inside a fiber by micro-machining a self-enclosed Fabry-Perot (F-P) cavity using a 157 nm laser. The strain and temperature characteristics of the etalon are experimentally studied. The results show that the displacement-phase shift coefficient and displacement-to-valley wavelength drift coefficient are 1mrad / μm and 5.2pm / μm, the linearity of the curve is 99.92%; the average temperature coefficient is 0.13mrad / ℃ and 0.64pm / ℃ in the temperature range from 18 ℃ to 500 ℃, the temperature is not sensitive. Experiments show that the standard has good sensing characteristics to meet the needs of a variety of strain testing, such as excellent stripe contrast (up to 30dB), low temperature cross-sensitivity, large potential for large-scale production, low cost and harshness Environmental ability and so on.