Natural gas leakage warning monitoring apparatus and method based on optic-fiber FP cavity-type probe

Abstract

The invention discloses a natural gas leakage warning monitoring apparatus based on an optic-fiber FP cavity-type probe, and relates to the technical field of warning monitoring. The apparatus includes a laser device, which is respectively connected with a signal generation module and a laser device driver; the laser device drives a sensor group, wherein conversion and demodulation of signals between the laser device and the sensor group are carried out through a laser processing system; the laser processing system sends the signal, detected by the sensor group, to a photoelectric detector, then the signal is converted into an electric signal thereby; the electric signal is amplified and sent to a data collection module through a pre-amplifier; the data information collected by the data collection module is sent to a control center to process the signal. In the invention, a plurality of sensors are driven by one laser device, so that the apparatus can supply sufficient laser energy, can achieve long-distance detection and multi-point time-sharing measurement; the sensors and transmission signal both belong to optic-fiber medium, so that the apparatus is passive and has intrinsic safety. The apparatus is suitable for flammable and combustible sites, such as petrochemical engineering, due to the whole optic-fiber networking manner.

Description

technical field [0001] The invention belongs to the technical field of early warning and monitoring, and in particular relates to a natural gas leakage early warning and monitoring device based on an optical fiber FP cavity probe, and a natural gas leakage early warning and monitoring method based on an optical fiber FP cavity probe. 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 frequent maintenance, low measurement accuracy and other shortcomings, it is difficult to achieve 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 explo...

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Problems solved by technology

[0004] Moreover, there are handheld methane gas remote detector products using this technology on the market abroad, the sensitivity can reach ppm level, the response time is 0.1s, but the measurement distance is less than 10m

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 use in dangerous places such as tunnels and natural gas stations.

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