Measurement of Axisymmetric Temperature Field by Interference Fringe Schlieren Method

： The temperature field is a common condition-monitoring parameter that is widely used to moni• tor the condition of large industrial equipment.The schlieren method is an effective flow-field visualization method to measure the spatial temperature field.The traditional schlieren method rebuilds the spatial re• fractive index field by directly measuring the light deflection angle and then calculating the temperature field.However， the light deflection angle is generally very small， and direct measurements produce large measurement errors.A method that uses interference fringes to amplify the light deflection angle is pro• posed， effectively improving the measurement accuracy of the schlieren technique.First， interference