Measurement and Analysis of Focus Dispersion in Infrared Compound-Eye Lens Array

Machining error and material stress are the main causes of focal length difference and mirror distortion of each sub-structure for the compound-eye lens array, which will cause each sub-aperture to defocus and increase the actual measurement error. In view of the difficulty in measuring the consistency of the axial focus position of large-scale infrared compound-eye lens array with a sub-aperture of millimeters, this paper proposes a measurement method based on the focal plane coupling parameter transmission in the optical system, and establishes an experimental measurement system for multi-aperture focal length consistency. The sharpness fixed focus method is used for the sampling precision measurement of the sub-aperture focal position consistency in an infrared compound-eye lens array. The measurement results show that the measured focal position range and the standard deviation of focal position are 21.0 μ$m$ and 6.26 μm, respectively. The measurement method for the multi-aperture focal position consistency proposed in this paper provides a quantitative evaluation method for the optical performance of the infrared compound-eye lens array.