Abstract: The present disclosure discloses a blind separation based high accuracy perspective detection method for a multilayer complex structure material. The method is achieved through blind separation of single channel periodic signals and frequency modulation interference of laser wave numbers. In this method, time series interference images captured by a photodetector are subjected to zero mean normalization; a vector ? of amplitude, frequency and phase field, which is to be solved and reflects characteristics of each interface in the multilayer complex-structure material, is created and is solved using a mathematical optimization method; a phase field distribution of the vector ? is finally extracted and is subjected to phase unwrapping, to realize high accuracy detection on an internal distribution of the multilayer complex structure material.

Abstract: The present disclosure discloses an apparatus for measuring an internal strain field of a dental resin, comprising: an optical measurement system, a probe and a data processor, wherein an optical fiber coupler in the optical measurement system has one input terminal connected to a light source, one output terminal connected to the probe, the other output terminal provided with an optical component including a reflective element for forming reference light and the other input terminal provided with an photoelectric imaging apparatus for receiving interference light formed by object light and the reference light. The probe is configured to irradiate detection light outputted from the optical fiber to a measured tooth and receive object light which is reflected by the tooth; and the data processor is configured to obtain a measurement result of the internal strain field of the measured dental resin according to an interference spectrum obtained through imaging by the photoelectric imaging apparatus.