Characterization of the displacement response in chromatic confocal microscopy with a hybrid radial basis function network

Wenlong Lu, Cheng Chen, Jian Wang, Richard Leach, Chi Zhang, Xiaojun Liu, Zili Lei, Wenjun Yang, Xiangqian Jiang

Research output: Contribution to journalArticle


Characterization of the displacement response is critical for accurate chromatic confocal measurement. Current characterization methods usually provide a linear or polynomial relationship between the extracted peak wavelengths of the spectral signal and displacement. However, these methods are susceptible to errors in the peak extraction algorithms and errors in the selected model. In this paper, we propose a hybrid radial basis function network method to characterise the displacement response. With this method, the peak wavelength of the spectral signal is firstly extracted with a state-of-art peak extraction algorithm, following which, a higher-accuracy chromatic dispersion model is applied to determine the displacement-wavelength relationship. Lastly, a radial basis function network is optimized to provide a mapping between the spectral signals and the residual fitting errors of the chromatic dispersion model. Using experimental tests, we show that the hybrid radial basis function network method significantly improves the measurement accuracy, when compared to the existing characterizing methods.

Original languageEnglish
Pages (from-to)22737-22752
Number of pages16
JournalOptics Express
Issue number16
Early online date25 Jul 2019
Publication statusPublished - 5 Aug 2019


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