One of the features of reliable polymer optical fiber (POF) Bragg grating sensors is high sensitivity. Towards this, we have investigated a method to enhance the intrinsic pressure and thermal sensitivity of fiber Bragg grating (FBG) sensors inscribed in POFs. By pre-straining the FBG we demonstrated that: (1) the pressure induced mechanical contraction of the fiber can be suppressed, resulting in an increase in the pressure sensitivity of the grating by a factor of 5; and (2) the temperature induced strain can be suppressed, resulting in an increase in the thermal response by more than a factor of 10. The pressure sensitivity enhancement was found to be independent of the amount of pre-strain for levels ranging from 0.07 to 0.33%. The enhancement of the temperature sensitivity was also found to be independent of the amount of pre-strain, but only for temperatures up to when the thermal expansion cancels the pre-strain.

高可靠度是可靠的聚合物光纤（POF）布拉格光栅传感器的特征之一。为此，我们研究了一种增强POF中刻写的光纤布拉格光栅（FBG）传感器的固有压力和热敏性的方法。通过对FBG进行预应变，我们证明：（1）可以抑制压力引起的光纤机械收缩，从而使光栅的压力敏感度提高5倍；（2）可以抑制温度引起的应变，从而使热响应增加10倍以上。发现压敏度的增强与预应变的量无关，范围为0.07至0.07。 0.33％。还发现温度敏感性的提高与预应变的量无关，