{'fraction_non_alphanumeric': 0.008352315869400152, 'fraction_numerical': 0.01366742596810934, 'mean_word_length': 4.8061674008810575, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Optimization Design of Optical System for On-Site Underground Injection Water Particle Size Detection

Aiming at the technical challenge that it is difficult to realize the on-site detection of the particle size of the underground injection water for the water-drive oilfield development we present a design concept of an optical system based on the optical scattering principle for the on-site injection water particle size detection Using a laser beam with a wavelength of 640 nm and a 4× collimated beam expander system we obtain an 8 mm illumination aperture Using pupil matching and aberration balance we achieve the optimal design of a compact optical system with a diameter of 42 mm which meets the particle size detection requirements in the 1--100 μm range and has the ability to realize the real time underground on-site detection The focal length of the optical system is 50 mm the field of view is 17° the aperture is 8 mm and the spot radius within the field of view is less than 6 μm which can effectively avoid the interference of non-scattered light on the energy of the photosensitive ring The detection of standard particle samples via prototype shows that the test accuracy is less than 5% which meets the design requirements and thus verifies the feasibility and rationality of the designed system