The core goal of structural design is to improve the efficiency and adaptability of optical signal transmission. Traditional probes have shortcomings such as insufficient light reception and fixed optical path length. The new design achieves a breakthrough through a Y-shaped fiber structure: the combined fiber bundle adopts a layout of "middle illumination fiber+peripheral detection fiber", with 6 illumination fibers evenly surrounding the central detection fiber, allowing the scattered light from the light source to be efficiently captured after transmission, significantly improving spectral detection efficiency. The probe body adopts a modular design, with the end tube and sleeve connected by threads. By rotating the sleeve, the distance between the lens and the reflector can be adjusted, achieving an adjustable optical path of 0.25-10mm. It can adapt to different concentrations of liquid detection without replacing the probe, greatly enhancing practicality. In addition, the liquid outlet adopts a through type through-hole design, combined with a detachable pressure ring and cover structure, which not only ensures rapid liquid circulation but also facilitates later maintenance.

Corrosion resistant design requires selecting suitable materials based on the characteristics of the contact medium. The core of the optical fiber is preferably made of quartz fiber, which has excellent corrosion resistance to most solvents and can be protected by a polyimide layer to avoid direct contact damage. The selection of shell materials is graded according to environmental requirements: 304 or 316 stainless steel is used for conventional environments, while PEEK, PTFE, or Hastelloy C276 is used for strong corrosion scenarios. These materials can still maintain structural stability in strong acid and alkali environments. The sealing process is bonded with corrosion-resistant epoxy resin, and ordinary metal rings are avoided at the joints. If necessary, silicone resin metal sleeves are used to enhance waterproof and anti-corrosion capabilities.

The collaborative optimization of structure and corrosion-resistant design is the key to improving the reliability of probes. For example, in chemical fluid monitoring, the combination of 316L stainless steel casing and quartz lens not only ensures stable optical path through threaded locking structure, but also utilizes material corrosion resistance to resist chemical medium erosion. For high-temperature corrosive environments, the combination of high-temperature resistant quartz fiber and Hastelloy shell can work for a long time at 200 ℃ while meeting the requirements of corrosion resistance.

The design of immersed fiber optic probes needs to balance optical performance and environmental adaptability: signal transmission is optimized through Y-shaped fiber layout and adjustable optical path structure, and environmental resistance is strengthened through corrosion-resistant materials such as quartz and PEEK and sealing processes. Future research and development should further promote material innovation and structural miniaturization, achieve synchronous improvement of detection efficiency and corrosion resistance, and adapt to more complex industrial application scenarios.