Fiber oxygen sensor for petroleum storage tank leakage monitoring

Abstract

The invention discloses a fiber oxygen sensor for petroleum storage tank leakage monitoring; the fiber oxygen sensor comprises an FP cavity, a FP cavity mirror surface, a resonant cavity, a resonant cavity mirror surface, an emitting end, an incident end and a metallurgy powder sleeve pipe; the top of the single mode fiber is sleeved with the resonant cavity mirror surface; the resonant cavity isarranged in the connecting portion between the resonant cavity mirror surface and the single mode fiber; the emitting end is arranged on one end of the resonant cavity mirror surface; the incident endis arranged on the other end of the resonant cavity mirror surface. The fiber oxygen sensor is scientific and reasonable in structure, safe and convenient to use, low in cost, simple in structure, can be widely promoted and mounted, and suitable for unmanned monitoring of the petroleum storage tank areas in a long time; the sensor can transmit via optical signals, thus improving the response speed; the metallurgy powder-in tube can prevent water molecules from entering the fiber oxygen sensor; oxygen molecules with the vibration inherent frequency at 760 nanometer of the oxygen can absorb light spectrums; the whole sensing structure is passive and electric neutral, thus preventing current of a conventional sensor from causing safety incidents.

Description

technical field [0001] The invention relates to the technical field of optical fiber oxygen sensors, in particular to an optical fiber oxygen sensor used for oil storage tank leakage monitoring. Background technique [0002] At present, the sensors used for natural gas leakage detection mainly include semiconductor gas sensors, electrochemical gas sensors, solid electrolyte gas sensors, contact combustion gas sensors, etc. These sensors generally have slow response speed and are easily interfered by other gas components. And the disadvantages of frequent maintenance and low measurement accuracy make it difficult to realize remote, real-time, online monitoring. The biggest disadvantage of this type of sensor is that it is charged by itself, and there are potential safety hazards when used in special environments such as flammable and explosive. In recent years, domestic and foreign The research in this field is developing rapidly, especially the optical detection method based...

AI Technical Summary

Problems solved by technology

[0002] At present, the sensors used for natural gas leakage detection mainly include semiconductor gas sensors, electrochemical gas sensors, solid electrolyte gas sensors, contact combustion gas sensors, etc. These sensors generally have slow response speed and are easily interfered by other gas components. And the disadvantages of frequent maintenance and low measurement accuracy make it difficult to realize remote, real-time, online monitoring. The biggest disadvantage of this type of sensor is that it is charged by itself, and there are potential safety hazards when used in special environments such as flammable and explosive. In recent years, domestic and foreign The research in this field is developing rapidly, especially the optical detection method based on laser absorption spectroscopy to monitor natural gas leakage, including non-dispersive infrared absorption (NDIR), Fourier transform infrared (FTIR) spectrometer and tunable Semiconductor laser spectroscopy (TDLAS) has the advantages of fast response speed and high detection efficiency, but NDIR and FTIR are detected by using the molecular absorption spectrum in the near-infrared band. The influence of gases such as CO2 and H2O in the air makes the measurement signal The background is large, the precision is low, and it is not suitable for remote measurement. Tunable semiconductor laser spectroscopy (TDLAS) has the advantages of high sensitivity, high resolution, and fast response, and can realize remote, online, and in-situ monitoring. It has become the mainstay of new natural gas leakage monitoring instruments. Moreover, there are handheld methane gas remote detector products using this technology on the market abroad, the sensitivity can reach the ppm level, the response time is 0.1 s, but the measurement distance is less than 10 m, and there are also related vehicle and airborne leakage On-site experiments on monitoring equipment, some extractive combustible gas detection devices have been developed by some companies, but this extractive equipment must extract and sample the on-site gas, and the detection time will increase, so it is not suitable for dangerous occasions such as tunnels and natural gas stations. For the monitoring of oxygen in this application environment, there is currently no effective monitoring method

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