Traditional high temperature sensors are unsuitable for high temperature real-time online measurement.In order to solve the problem,a novel high temperature resistant fiber Bragg grating(FBG) sensing system based on wavelength modulation is developed.A new packaged high temperature-resistant FBG sensor head is designed in this system,which is small in volume and has high sensitivity and good linearity.The diffraction technique based on InGaAs image sensor is used to demodulate the reflected wave...