Multi-parameter efficient and non-destructive testing of optical lenses is a key link in improving the quality of optical manufacturing. Traditional contact measurement methods suffer from low efficiency and potential damage to the lens surface, while existing non-contact optical detection technologies struggle to simultaneously achieve high-precision measurements of thickness, refractive index and Abbe number. A multi-parameter synchronous detection method based on LED low-coherence interferometry technology is proposed. Utilizing a Michelson interferometer optical path structure, a joint solution model for lens center thickness, refractive index and Abbe number is established through the principle of equal optical path length. In experiments, LED light sources with wavelengths centered at 465 nm and 625 nm, a 50∶50 beam splitter, and a grating for distance measurement are used to perform repeated measurements on standard lenses made of resin, glass and polycarbonate (PC) materials. The experimental results show that this method can measure lens thickness within the range of 0.5-5.0 mm, with an absolute error of ±5 μm; the refractive index measurement range is 1.3-1.8, with an error of ±0.005; the Abbe number analysis range is 25-70, with a relative error of 5%. The system’s repeatability error is below 0.1%, and the single measurement time is less than 9 s. This method provides an efficient and high-precision non-destructive testing solution for optical lens production quality inspection.
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