All-fiber carbon isotope detection system and detection method

Abstract

The all-fiber carbon isotope detection system comprises a detection light source, a time-delay optical fiber and an input optical fiber, an optical fiber annular channel comprises a hollow-core optical fiber air chamber, and the two opposite ends of the hollow-core optical fiber air chamber are connected with the time-delay optical fiber and the input optical fiber respectively; the probe light is propagated in the optical fiber annular channel and circularly passes through the hollow-core optical fiber air chamber; the hollow-core optical fiber gas chamber is filled with gas to be detected; the pump light source is connected with the optical fiber annular passage and is used for generating pump light and introducing the pump light into the hollow-core optical fiber gas chamber, the temperature and the refractive index of gas are changed under the action of the pump light, and the phase of probe light is changed after the probe light passes through the gas in the hollow-core optical fiber gas chamber; the photoelectric detector is used for receiving the phase-changed detection light returned by the delay optical fiber and the input optical fiber; and the data processing controller is electrically connected with the photoelectric detector and the pump light source respectively. The problems of high gas consumption, high cost and large volume caused by a large optical gas chamber of the existing carbon isotope detection device are solved. 本发明公开一种全光纤化的碳同位素检测系统以及检测方法，包括：检测光源，延时光纤和输入光纤，光纤环形通路包括空芯光纤气室，空芯光纤气室相对立的两端分别连接延时光纤和输入光纤，探测光在光纤环形通路中传播并循环经过空芯光纤气室；空芯光纤气室内填充有待检测的气体；泵浦光源连接光纤环形通路，并用于产生泵浦光并通入到空芯光纤气室，气体通过泵浦光的作用而改变温度和折射率，探测光经过空芯光纤气室的气体而改变相位；光电探测器用于接收延时光纤和输入光纤中所传回的相位改变后的探测光；数据处理控制器分别电连接光电探测器与泵浦光源。解决当下的碳同位素检测装置因光学气室大而导致耗气量大、成本高、体积大的问题。