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A Novel and Fast Non-dispersive Infrared Gas Detection Technique

一种新型快速的非分光红外气体检测技术

Abstract—In the science and industry fields, Non-dispersive Infrared (NDIR) gas Detection Technique is usually used to measure the concentration of carbon dioxin (CO2). NDIR is an accurate and stable technique for analysing gas concentration and to be used in running automatic monitor system or long-term stable measurement. So far, it usually require 5 to 15 minutes to activate the circuit system until it is ready for measuring and the light source would be able to produce a stable spectrum infrared radiation. This research will use Correlated Double Sampling to adjust timing and shading value for analysing, which can improve not only the slow wait time effectively, but also the practicability of NDIR measurement substantially. The detector that design for the research required 28 seconds to activate and the effective loading time for measurement takes 37.5 seconds which is shorten about 23times of effective loading time with 865.5 seconds as the standard CO2 detectors do.

引言：在科学和工业领域，非分光红外检测技术（NDIR）已经经常被用来检测CO2气体的浓度。NDIR是一种准确稳定的气体浓度分析技术, 可用于运行自动监测系统或长期稳定的进行测量。到目前为止, 通常需要5到15分钟才能激活电路系统, 直到它准备好测量并且光源能够产生稳定的光谱红外辐射为止。本研究将利用相关双采样来调整时序和遮阳值进行分析, 这样不仅能有效地提高缓慢的等待时间, 而且能大大提高NDIR测量的实用性。为研究设计的检测器需要28秒的激活时间, 测量的有效加载时间需要37.5秒, 比标准CO2探测器的有效加载时间（865.5秒）缩短约23倍。

Keywords— Non-dispersive, Infrared gas detection, Correlated Double Sampling technique, CO2

关键词—非分光红外检测，相关双采样，CO2

1、INTRODUCTION

1、介绍

Most of the gas is colorless and odorless in daily lives, the smell of human sense is not able to be used as a way to recognize the difference of gas. However, there are some harmful gases which exist in the colorless and odorless gas. In a confined space, it is an important norm to manage the concentration of carbon dioxin (CO2) and the normal content is 0.03%. If the concentration of CO2 reaches to 1%, it will make people fell stuffy, dizzy, and palpitations; then people will feel shortness of breath, headache, and worse dizziness when it comes to 4 to 5%. When the time the concentration of CO2 gets to 10%, the function of human body will become serious disorder that makes people lose consciousness, unconsciousness, and respiratory arrest to death. In this point, the concentration detection of CO2 has its importance and necessity.

大多数气体在日常生活中是无色无臭的, 仅通过人类自身的感觉不能作为识别气体差异的一种方式。然而, 在这些无色、无臭气体中却存在着一些有害气体。在密闭空间内，二氧化碳浓度管理是一项重要的规范，其正常含量是0.03%。如果二氧化碳浓度达到1%, 就会使人感到闷热、头晕和心悸；当达到4%到5%的时候, 人们会感到呼吸急促、头痛和头晕加重。当二氧化碳浓度达到10%时, 人体的功能就会变成严重的紊乱, 使人失去意识、昏迷和呼吸骤停致死。在这一点上,二氧化碳的浓度检测有其重要性和必要性。

There are various types of gas sensors in the market, according to detective principles to classify them, the analysing methods usually are continuous sampling method which come with three main measuring types: the infrared type, ultraviolet (UV) ray type and thermal conductivity type. The UV ray type gas analysing is based on the UV radiation selectivity of absorption principle on the gas that to be measured, but the price of the machine will be higher with the same performance and function which compares to others. The principle of thermal conductivity gas analysing is to use the different thermal conductivity of gases, which have different rate to transfer heat with measurement. However, it is very sensitive with fluctuations of pressure and flow of the gas, especially the vapor, particles and other impurities in the medium will have a greater influence in measuring. In this case, a complex pre-sample system must be installed in order to get a measurement value. The infrared type of gas analysing method is based on Non-dispersive infrared (NDIR) spectrum that has been use commonly in these days. NDIR is an accurate and stable technique for analysing gas concentration and to be used in running automatic monitor system or long-term stable measurement.

当今市场上有各种类型的气体传感器, 根据检测原理对其进行分类, 分析方法通常是连续采样方法, 主要有三种测量类型: 红外型、紫外线(UV)射线型和导热性型。紫外射线型气体分析是基于吸收原理对待测量气体的紫外辐射选择性，但是机器的价格会比同性能和功能的其他机器高昂。热导气体分析的原理是利用气体的不同导热系数,可以通过气体所具有的不同的传热速率来进行测量。然而, 它对于压力和气体的流动波动非常敏感, 特别是蒸汽, 颗粒和其他杂质在测量时会具有很大影响。对于这种情况, 必须安装复杂的预采样系统, 以获得有价值的测量值。红外型气体分析方法是基于非色散红外 (NDIR) 光谱, 这个方法在当今是普遍使用的NDIR是一种准确稳定的气体浓度分析技术, 可用于运行自动监测系统或长期稳定的进行测量。

It usually require 5 to 15 minutes for the light source to produce a stable spectrum distribution with infrared radiation except the time for the gas to diffusion in chamber, which make this technique cannot be used in different type of measurement required. It occur huge errors when the machine cannot reach the stable thermal radiation in some pragmatic measurement.

光源通常需要5到15分钟才能产生的稳定的红外辐射光谱分布, 但气体在室内扩散的时间除外，这使得这种技术不能用于所需的不同类型的测量。在一些实际测量中, 当机器无法达到稳定的热辐射时, 就会出现巨大的误差。

There are two main items which were designed for this research, the first is to analyze infrared light sources of different power matching and the second is analyzing the infrared light bright and dark time of deployment. Finally, combining the advantages of both analyses

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