Method for detesting natural gas and toxic gas with real-time mobile remote sensor

Abstract

Disclosed is a detecting method of natural gas and poisonous gas, utilizing a real-time mobile remote measuring sensor, wherein a multiple harmonic modulated semiconductor laser absorption spectroscopy method, an photoelectricity receiving system, a DSP software/hardware technology and a laser driving circuit are utilized. A laser beam emitted from an infrared laser emitting/receiving unit formed by a semiconductor laser, fibers, collimating mirrors, filters, photoelectric detectors and micro coke rate reflectors is output after it is collimated by the collimating mirrors through fibers, and then is scattered when it meets an objective. After a frequency selection and filtration by the filters, the scattered laser is then focused, by a reflector, to the photosensitive surface of the photoelectric detector where it is received. The analog signals of a photoelectric detection are digitalized and then sent to the DSP signals processor for a processing to provide concentration information of natural gas and poisonous gas to be tested between the emitting laser and the objective. Therefore, a continuous mobile detection of natural gas and poisonous gas invading into a production locale or a non-production locale is achieved to maintain the safety of the production locale or a non-production locale.

Description

1. Technical field [0001] The invention belongs to the field of ring mirror science and spectroscopy, and in particular relates to a detection method for natural gas and toxic gas by using a real-time mobile telemetry sensor. 2. Background technology [0002] Natural gas is flammable, explosive and toxic, so it is very important to ensure the safe operation of gas pipelines and gas treatment station facilities. After a long period of service in natural gas pipelines, failure accidents may occur due to external interference, corrosion, pipe material and construction quality, etc., resulting in fires, explosions, poisoning, major economic losses, casualties and environmental pollution. In addition, high-sulfur natural gas accounts for a considerable proportion of my country's proven natural gas reserves. The characteristic of high-sulfur natural gas is that it not only contains high H2S, but also is rich in CO2. The combination of these two acidic substances will cause serio...

AI Technical Summary

Problems solved by technology

Chemical sensors have high sensitivity, but are prone to "poisoning" failure and require frequent maintenance; semiconductor sensors: poor selectivity, easily interfered by other gas components in the atmosphere, high false alarm rate, and the instrument also needs regular zero calibration

In addition to the shortcomings of semiconductor sensors, metal oxide sensors also have the disadvantage of sleep

The infrared gas sensor has the defects of low detection sensitivity and easy interference due to the principle of reason, resulting in high post-maintenance costs

The southwestern region where my country's high-sulfur natural gas reservoirs are located is located in a mountainous area. The terrain in this area is complex, geological disasters occur frequently, and the local weather is changeable. The influence limits the practical application of the above sensors in natural gas gathering and transportation, long-distance transportation and urban pipeline networks.

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