Chromatic confocal measurement decoded using color recognition for high resolution, integration, and efficiency

• DOI: 10.1364/oe.546702
• Publication Date: 2025-03-22T06:57:24Z
• Authors: Jiayu Ru; Xueliang Zhu; Siying Liu; Bingcai Liu; Hongjun Wang; Ailing Tian; Weiguo Liu

We proposed a chromatic confocal measurement method for color recognition of spectral signals that uses a color detector. This method addressed insufficient color resolution using quantization-based subdivision, and it provided a theoretical basis to improve confocal measurement resolution. In addition, its size was approximately 1/200th that of conventional spectrometers on the market, which was conducive to the realization of online detection applications. Furthermore, this method used one-point data to obtain the one-point position, which provided a significant absolute efficiency advantage. According to the experimental results, the system achieved an axial resolution of 0.37 µm with a measurement range of 2.05 mm. This color-decoding method was characterized by its high resolution, compact size, and rapid processing capabilities. It thus demonstrated its significant potential for future applications in the optical precision measurement field.