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Metal porphyrin langmuir blodgett film optical fiber gas sensor

A gas sensor and metalloporphyrin technology, which is applied in instruments, scientific instruments, and material analysis through optical means, can solve the problems of detection accuracy affecting the promotion and application of sensors, poor selective recognition ability, and insufficient sensitivity, so as to improve Sensitive material selectivity, precise thickness control, and good film formation uniformity

Inactive Publication Date: 2009-12-09
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Such as figure 1 As shown, a metalloporphyrin Langmuir-Brodite membrane optical fiber gas sensor mainly includes 4 sets of dual-arm optical fibers, 4 reaction chambers, and 4 sets of metalloporphyrin LB membrane array plates. The metalloporphyrin LB film array plate consists of a metalloporphyrin LB film array 6 , a substrate 7 and a mirror 8 . The optical fiber is a general optical fiber. The incident fiber 1 and the exit fiber 2 have the same aperture. Each group of double-armed fibers is composed of an incident fiber 1, an exit fiber 2 and a fiber probe 3. The other end of the fiber probe 3 is set aside. For the very short fiber head part, the incident and outgoing fiber heads are fixed in the fiber probe at the same angle and opposite to each other symmetrically, and the optical path direction of the remaining part of the incident and outgoing fiber heads should point to the metal porphyrin corresponding to the group of double-armed fibers. The center point of the ...

Embodiment 2

[0028] A metalloporphyrin Langmuir-Brodite membrane optical fiber gas sensor mainly includes 2 sets of double-arm optical fibers, 4 reaction chambers, and 2 sets of metalloporphyrin LB membrane array plates. The metalloporphyrin LB film array plate consists of a metalloporphyrin LB film array 6 , a substrate 7 and a mirror 8 . The optical fiber is a general optical fiber. The incident fiber 1 and the exit fiber 2 have the same aperture. Each group of double-armed fibers is composed of an incident fiber 1, an exit fiber 2 and a fiber probe 3. The other end of the fiber probe 3 is set aside. For the very short fiber head part, the incident and outgoing fiber heads are fixed in the fiber probe at the same angle and opposite to each other symmetrically, and the optical path direction of the remaining part of the incident and outgoing fiber heads should point to the metal porphyrin corresponding to the group of double-armed fibers. The center point of the LB film, so that the light...

Embodiment 3

[0030] A metalloporphyrin Langmuir-Brodite membrane optical fiber gas sensor mainly includes 6 sets of double-arm optical fibers, 4 reaction chambers, and 6 sets of metalloporphyrin LB membrane array plates. The metalloporphyrin LB film array plate consists of a metalloporphyrin LB film array 6 , a substrate 7 and a mirror 8 . The optical fiber is a general optical fiber. The incident fiber 1 and the exit fiber 2 have the same aperture. Each group of double-armed fibers is composed of an incident fiber 1, an exit fiber 2 and a fiber probe 3. The other end of the fiber probe 3 is set aside. For the very short fiber head part, the incident and outgoing fiber heads are fixed in the fiber probe at the same angle and opposite to each other symmetrically, and the optical path direction of the remaining part of the incident and outgoing fiber heads should point to the metal porphyrin corresponding to the group of double-armed fibers. The center point of the LB film, so that the light...

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Abstract

A metalloporphyrin Langmuir-Brodite film optical fiber gas sensor relates to a sensor for detecting harmful gas devices in industrial production environments. The sensor of the invention mainly includes a double-arm optical fiber, a reaction chamber, a metalloporphyrin LB film array plate, and the like. Since the sensor of the present invention has the characteristics of low detection limit, high sensitivity, reusability, and wide detection range of gases, the present invention can be widely used to detect various volatile toxic gases in human production and living environments, and is especially suitable for industrial production. NO2, SO2, NO, CO, H2S, and phosgene and other harmful gas emission qualification testing and leakage testing.

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 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/17
Inventor 侯长军霍丹群龚恒郑小林廖海洋侯文生杨军皮喜田
Owner CHONGQING UNIV
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