1. A measurement and reconstruction method for a turbine blade strain field based on fusion of an imaging technology and an infrared photoelectric measurement technology, comprising steps of: using the imaging technology to perform digital image measurement and treatment on a strain of a blade surface area, and calculating a displacement change of the blade surface area based on blade surface feature points; using the infrared photoelectric measurement technology to collect infrared radiation signals at blade edges, and identifying a displacement change of the blade edges at different temperatures based on radiation intensity differences between blades and blade gaps; fusing data measured by the two technologies through interpolation to obtain a target blade overall displacement change distribution under a specific working condition, and reconstructing a blade full-field strain, wherein the two measurements are performed independently with one dual-mode probe.
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