The chemical imaging sensor is a semiconductor-based chemical sensor capable of visualizing pH and ion distributions. The spatial resolution depends on the lateral diffusion of photocarriers generated by illumination of the semiconductor substrate. In this study, two types of optical setups, one based on a bundle of optical fibers and the other based on a binocular tube head, were developed to project a hybrid illumination of a modulated light beam and a ring-shaped constant illumination onto the sensor plate. An improved spatial resolution was realized by the ring-shaped constant illumination, which suppressed lateral diffusion of photocarriers by enhanced recombination due to the increased carrier concentration.

化学成像传感器是基于半导体的化学传感器，能够可视化pH和离子分布。空间分辨率取决于通过半导体衬底的照射产生的光载流子的横向扩散。在这项研究中，开发了两种类型的光学装置，一种基于光纤束，另一种基于双目镜筒头，以将调制光束和环形恒定照明的混合照明投射到传感器上盘子。通过环形恒定照明实现了改善的空间分辨率，该环形照明通过增加载流子浓度而增强复合，从而抑制了光载流子的横向扩散。