Trace atmosphere online detection system

The invention discloses a trace atmosphere on-line detection system, which is characterized in that when the system is used for atmosphere detection, a fiber grating sensor converts the change of environmental parameters of detected equipment into the offset of Bragg wavelength; the environmental parameters comprise temperature, pressure, humidity and gas concentration; the demodulator obtains the offset of the Bragg wavelengths, combines the light intensities corresponding to different Bragg wavelengths after continuous offset to obtain spectral data, and uploads the spectral data to the upper computer; and the upper computer obtains actual values of the measured environmental parameters according to the spectral data and the calibration parameters. The accuracy of the detection effect can be improved, the detection system is more convenient, and real-time detection can be achieved. 本发明公开一种痕量气氛在线检测系统，该系统进行气氛检测时，所述光纤光栅传感器将所述被测设备的环境参数的变化转换为布拉格波长的偏移量；所述环境参数包括温度、压力、湿度和气体浓度；所述解调仪获取所述布拉格波长的偏移量，将连续的发生偏移后的不同布拉格波长对应的