ing 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.
Deli Jia, Quanbin Wang, Boshi Dang, Siyu Jin, Ying Liu. Optimization Design of Optical System for On-Site Underground Injection Water Particle Size Detection[J]. Laser & Optoelectronics Progress, 2020, 57(19): 191901