Metal porphyrin langmuir blodgett film optical fiber gas sensor

Abstract

A metal porphyrin lange mull bulogit film optical fiber gas sensor relates to a sensor for checking harmful gas device in industrial condition. The inventive sensor comprises a dual-arm optical fiber, a reaction chamber, and a metal porphyrin LB film array board. The invention is characterized in low check limit, high sensitivity, repeat application, and wide check air range, and the invention can be used to check various volatile harmful gas, more particularly check the discharge and leaked harmful gas as NO2, SO2, NO, CO, H2S and carbonyl chloride.

Description

technical field [0001] The invention belongs to the technical field of detecting harmful gas in the atmospheric environment, in particular to a sensor for detecting harmful gas in the industrial production environment. Background technique [0002] With the rapid development of industrial technology, industrial production has brought a large number of pollutants to the human living environment, mainly volatile organic compounds (VOCs) gases, such as nitrogen dioxide (NO 2 ), nitric oxide (NO), ammonia (NH 3 ), hydrogen sulfide (H 2 S), phosgene, etc. These volatile organic gases have seriously affected human's daily life environment, and constantly endanger people's physical and mental health. Among them, nitrogen dioxide is corrosive and physiologically stimulating, which will damage the development of the lungs and lead to changes in the structure of the lungs. It is one of the main factors for the formation of photochemical smog and one of the sources of acid rain. It ...

AI Technical Summary

Problems solved by technology

The biggest feature of this type of fiber optic gas sensor is that it adopts a single-input-single-out optical path transmission form, and there are some sensors that use a single-input and multiple-out optical structure, but the multi-bundle output optical fibers used to detect the target substance are still A certain single information of a substance, whether it is an incident signal or an outgoing signal, can only represent a specific sensitive characteristic of a substance

Such a fiber optic gas sensor can only identify one substance or a class of substances with the same characteristics, and its selective recognition ability is poor, and its sensitivity is not high enough.

For sensors using metalloporphyrins as sensitive substances, such as Sichuan University's "Research on Dissolved Oxygen Sensors of Tetrabromophenylplatinum Porphyrin Polyvinyl Chloride Sensitive Films", the sensitive film is directly prepared by a rotary membrane instrument. Such a sensor Sensitive membranes often affect the promotion and application of such sensors due to incomplete reaction, detection accuracy and selectivity.

Images