System for measuring concentration of trace substance

A technology of substance concentration and measurement system, which is applied in the field of optical detection, can solve the problems of reducing the portability of equipment, and achieve the effects of low production cost, convenient portability and improved sensitivity

Inactive Publication Date: 2015-07-01
FUZHOU PHOTOP QPTICS CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

which reduces the portability of the device

Method used

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  • System for measuring concentration of trace substance
  • System for measuring concentration of trace substance
  • System for measuring concentration of trace substance

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Embodiment Construction

[0021] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0022] The trace substance concentration measuring system of the present invention adopts a coreless optical fiber close to the diameter of the fundamental wave to transmit the signal light for detection, and utilizes the skin effect of the surface laser on the surface of the coreless optical fiber with a length of the order of one kilometer to make the light transmitted in the coreless optical fiber The signal light can be absorbed by the substance to be measured to detect the concentration of trace substances in gas or liquid. Specifically, the trace substance concentration measurement system includes a light source, a spectroscopic unit, a coupling unit, a coreless optical fiber, a second detector, and a first detector arranged on one side of the spectroscopic unit arranged along the optical path. Among them, the coreless fiber is wound side...

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Abstract

The invention discloses a system for measuring a concentration of a trace substance. The system comprises a light source, a light splitting unit, a coupling unit, coreless optical fibers and a second detector arranged along an optical path, and also comprises a first detector arranged at one side of the light splitting unit. The coreless optical fibers are not overlaid and are wound on an optical fiber support side by side. The light splitting unit splits lights emitted by the light source into reference light and signal light, and the reference light directly enters into the first detector. The signal light is coupled to the coreless optical fibers by the coupling unit and enters into the second detector by the coreless optical fibers. Through skin effects of laser propagated in the coreless optical fiber with the diameter close to a fundamental wave diameter, the signal light propagated in the coreless optical fiber can be absorbed by a substance to be detected and is used for trace substance detection so that detection of signal light in an absorption cell is greatly improved and spectral detection sensitivity is effectively improved. The system has a small volume, can be carried conveniently, is suitable for continuous, real time and fast remote sensing monitoring of gaseous and liquid trace substances, and has a low making cost.

Description

technical field [0001] The invention relates to the field of optical detection, in particular to a trace substance concentration measurement system. Background technique [0002] With the development of optical technology, more and more optical detection methods are used in the field of measurement of atmospheric trace gas and liquid concentration. Compared with traditional sampling and contact chemical measurement methods, the spectral measurement method is convenient and simple to extract, can measure the absolute concentration of trace gases without changing their chemical properties, and can realize continuous, real-time and rapid monitoring of large-scale air pollution remote sensing monitoring. [0003] Atmospheric trace gases such as CO 2 、CH 4 , CO, NO, N 3 o 4 , NH 3 , SO 2 、C 2 h 2 、C 2 h 4 、C 2 h 6 etc. Their concentrations in the atmosphere are mainly in the range of ppt-ppm, and the detection sensitivity of spectral technology is high, generally rea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/01
Inventor 吴砺张新汉林志强李俊梅刘鸿飞林磊
Owner FUZHOU PHOTOP QPTICS CO LTD
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