CN205484030U - Ultraviolet absorption spectrum based adjustable wavelength measuring device for concentration of H2S and SO 2 mixed gas - Google Patents
Ultraviolet absorption spectrum based adjustable wavelength measuring device for concentration of H2S and SO 2 mixed gas Download PDFInfo
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Abstract
本实用新型为一种基于紫外吸收光谱H2S和SO2混合气体浓度可调波长测量装置，该装置包括光源模块、紫外光波段调节模块、混合气体注入提取模块和气体浓度测量分析模块；所述的光源模块为紫外光源；所述的紫外光波段调节模块包括第一透镜与紫外截止滤波片两部分；所述的混合气体注入提取模块包括样品池、第一球阀、样品集气瓶、第二球阀、真空计、真空泵和第二透镜；其中紫外光源、第一透镜、紫外截止滤波片、样品池、透镜前后顺次排列并同轴分布；样品集气瓶与样品池连接；真空计、真空泵分别与样品池相连。本实用新型利用紫外吸收光谱技术，紫外光能被这两种气体特征吸收，实现了实时性检测和自动测量。
The utility model is a wavelength adjustable measuring device for the concentration of H2S and SO2 mixed gases based on ultraviolet absorption spectrum, and the device comprises a light source module, an ultraviolet light band adjustment module, a mixed gas injection and extraction module and a gas concentration measurement and analysis module; the light source module is an ultraviolet light source; the ultraviolet light band adjustment module comprises a first lens and an ultraviolet cut-off filter; the mixed gas injection and extraction module comprises a sample pool, a first ball valve, a sample gas collection bottle, a second ball valve, a vacuum gauge, a vacuum pump and a second lens; wherein the ultraviolet light source, the first lens, the ultraviolet cut-off filter, the sample pool and the lens are arranged in sequence and coaxially distributed; the sample gas collection bottle is connected to the sample pool; the vacuum gauge and the vacuum pump are respectively connected to the sample pool. The utility model utilizes ultraviolet absorption spectrum technology, and ultraviolet light can be absorbed by the characteristics of the two gases, thereby realizing real-time detection and automatic measurement.
Description
技术领域technical field
本实用新型属于混合气体浓度测量仪器技术领域，具体来说是基于紫外吸收光谱H2S和SO2混合气体浓度可调波长测量装置。 The utility model belongs to the technical field of mixed gas concentration measuring instruments, in particular, it is an adjustable wavelength measuring device based on ultraviolet absorption spectrum H2S and SO2 mixed gas concentration.
背景技术Background technique
就目前社会发展的现状来说，经济发展的同时也造成了能量的大量消耗，进而导致环境污染的问题越来越严重，而大气污染也是多种环境污染中最为严重的一个，针对于大气污染物中主要污染物H2S和SO2气体的测量来说，以往传统测量低浓度的H2S和SO2混合气体的方法主要为化学分析法，即需在现场采取样品，然后带到实验室或在现场用特定的仪器进行分析，这样操作比较复杂，而且需要较大的人力和实时性也比较差，另外重庆大学的梅魏鹏发表的硕士论文基于紫外差分光谱的SO2、NOX混合气体的检测算法研究，文中只是大概分析了一些降噪手段和通过不同的反演算法来提高精度，实时性差且操作计算要复杂了很多；申请号为200910135826.8的中国发明专利申请公开了一种智能紫外气体分析仪产品，此专利是采用两个电检测器来测量气体浓度的，无法避免各自光路和电路中产生的外界影响，难以高精度、稳定地实现低浓度气体的测量。现在对于污染气体的检测有效的手段与技术还是相对于来说是比较少的，对于其主要大气污染物中的H2S和SO2测量技术运用到实际类型的实时气体检测仪器更少之又少，且技术手段很不成熟，测量精度也不是很高；因此开发具有在线监测H2S和SO2混合气体浓度值功能的高精度的仪器对我们应对环境污染来说是迫切需要的。As far as the current status of social development is concerned, economic development has also caused a large amount of energy consumption, which has led to more and more serious environmental pollution, and air pollution is also the most serious of various environmental pollution. For the measurement of the main pollutants H 2 S and SO 2 gases in the gas, the traditional method of measuring low-concentration H 2 S and SO 2 mixed gases is mainly chemical analysis, that is, samples need to be taken on site and then brought to the experiment In the laboratory or in the field with a specific instrument for analysis, this operation is more complicated, and requires a lot of manpower and poor real-time performance. In addition, Mei Weipeng of Chongqing University published a master's thesis based on ultraviolet differential spectroscopy of SO2, NOX mixed gas The research on the detection algorithm, the paper only roughly analyzes some noise reduction methods and improves the accuracy through different inversion algorithms, the real-time performance is poor and the operation and calculation are much more complicated; the Chinese invention patent application with the application number of 200910135826.8 discloses an intelligent ultraviolet For gas analyzer products, this patent uses two electrical detectors to measure gas concentration, which cannot avoid the external influences generated in their respective optical paths and circuits, and it is difficult to achieve low-concentration gas measurement with high precision and stability. At present, there are relatively few effective means and technologies for the detection of polluted gases, and there are even fewer real-time gas detection instruments for the measurement of H 2 S and SO 2 in the main air pollutants. There are few, and the technical means are very immature, and the measurement accuracy is not very high; therefore, it is urgent for us to develop a high-precision instrument with the function of on-line monitoring the concentration of H 2 S and SO 2 mixed gas for us to deal with environmental pollution.
实用新型内容Utility model content
本实用新型的目的在于克服现有技术测量误差大和测量精度低等不足，提供了一种紫外吸收光谱H2S和SO2混合气体浓度可调光波测量装置。本实用新型测量装置创新的结合紫外滤波片、maya2000pro的光纤光谱仪、石英玻璃做的紫外吸收率低的样品池以及计算机与其他辅助器件；实现了高精度实时在线检测H2S和SO2混合气体的浓度值；其中通过紫外光波段调节模块，能够实现手动调节光波段，可单一测其中一种气体(H2S气体)浓度值；整个H2S和SO2混合气体浓度测量装置的测量误差小，测量精度高。The purpose of the utility model is to overcome the shortcomings of large measurement error and low measurement precision in the prior art, and provide a light wave measurement device with adjustable concentration of mixed gas of H 2 S and SO 2 in ultraviolet absorption spectrum. The measuring device of the utility model innovatively combines ultraviolet filters, maya2000pro optical fiber spectrometers, sample pools made of quartz glass with low ultraviolet absorption rates, computers and other auxiliary devices; it realizes high-precision real-time online detection of H 2 S and SO 2 mixed gases The concentration value of the concentration value; among them, through the ultraviolet light band adjustment module, manual adjustment of the light band can be realized, and the concentration value of one of the gases (H 2 S gas) can be measured alone; the measurement error of the entire H 2 S and SO 2 mixed gas concentration measurement device Small, high measurement accuracy.
本实用新型解决技术问题所采用的技术方案是：The technical solution adopted by the utility model to solve technical problems is:
一种基于紫外吸收光谱的混合气体浓度可调波长测量装置，该装置包括光源模块、紫外光波段调节模块、混合气体注入提取模块和气体浓度测量分析模块；其中光源模块、紫外光波段调节模块、混合气体注入提取模块和气体浓度测量分析模块依照光源光照方向顺序排列；A mixed gas concentration adjustable wavelength measurement device based on ultraviolet absorption spectroscopy, the device includes a light source module, an ultraviolet light band adjustment module, a mixed gas injection extraction module, and a gas concentration measurement and analysis module; wherein the light source module, the ultraviolet light band adjustment module, The mixed gas injection extraction module and the gas concentration measurement and analysis module are arranged in sequence according to the light direction of the light source;
所述的光源模块为紫外光源；The light source module is an ultraviolet light source;
所述的紫外光波段调节模块包括第一透镜与紫外截止滤波片两部分；The ultraviolet light band adjustment module includes two parts: a first lens and an ultraviolet cut-off filter;
所述的混合气体注入提取模块包括样品池、样品集气瓶、真空计、真空泵和第二透镜；其中紫外光源、第一透镜、紫外截止滤波片、样品池、第二透镜前后顺次排列并同轴分布；样品集气瓶与样品池连接；真空计、真空泵分别与样品池相连；The mixed gas injection extraction module includes a sample cell, a sample gas collection bottle, a vacuum gauge, a vacuum pump, and a second lens; wherein the ultraviolet light source, the first lens, the UV cut-off filter, the sample cell, and the second lens are arranged in sequence and Coaxial distribution; the sample collection cylinder is connected to the sample pool; the vacuum gauge and vacuum pump are respectively connected to the sample pool;
所述气体浓度测量分析模块的组成包括光纤、光谱仪和计算机；其中光纤、光谱仪和计算机依次连接；光纤的光纤探头位于第二透镜的焦点处。The composition of the gas concentration measurement and analysis module includes an optical fiber, a spectrometer and a computer; wherein the optical fiber, the spectrometer and the computer are connected in sequence; the optical fiber probe of the optical fiber is located at the focal point of the second lens.
所述的光谱仪采用maya2000pro的光纤光谱仪；所述的紫外光源为氘灯放射的160nm～450nm的紫外光。The spectrometer adopts a maya2000pro fiber optic spectrometer; the ultraviolet light source is ultraviolet light of 160nm to 450nm emitted by a deuterium lamp.
与现有气体浓度检测技术相比，本实用新型克服了以往化学检测误差大和精度低的特点，实现了实时性检测和自动测量，具有很大的先进性，具体体现在以下几个方面：Compared with the existing gas concentration detection technology, the utility model overcomes the characteristics of large error and low precision in the previous chemical detection, realizes real-time detection and automatic measurement, and has great advancement, which is embodied in the following aspects:
(1)实用新型装置是利用紫外吸收光谱技术，紫外光能被这两种气体特征吸收；并根据线性理论导出了一种新的测量H2S和SO2混合气体中H2S气体浓度的测量方法，这种H2S线性测量方法简单有效且测量精度高，另外实用新型装置创新的加入了紫外滤波片来调节入射光的波长，把波长截止到200nm范围内，H2S气体的特征吸收峰在190nm～200nm范围内，而SO2气体在此波段特征吸收很弱，这样就能更好更精确的测量H2S气体的浓度。(1) The utility model device uses ultraviolet absorption spectroscopy technology, and ultraviolet light energy is absorbed by the characteristics of these two gases; and based on the linear theory, a new method for measuring the concentration of H 2 S gas in the mixed gas of H 2 S and SO 2 is derived Measurement method, this H 2 S linear measurement method is simple and effective and has high measurement accuracy. In addition, the utility model innovatively adds an ultraviolet filter to adjust the wavelength of the incident light, and cuts the wavelength to 200nm. The characteristics of H 2 S gas The absorption peak is in the range of 190nm to 200nm, and the characteristic absorption of SO 2 gas in this band is very weak, so that the concentration of H 2 S gas can be measured better and more accurately.
(2)测量方法简单；我们可以对低浓度地的H2S和SO2混合气体浓度一起进行检测；而且可以达到完全不用人工接触的自动监测；进而减少人为因素所造成误差的影响。(2) The measurement method is simple; we can detect the mixed gas concentration of H 2 S and SO 2 in low-concentration areas together; and can achieve automatic monitoring without manual contact; thereby reducing the influence of errors caused by human factors.
(3)装置仪器的灵敏度也是很高的；对于污染气体只需选择恰当的光谱波段，其测量结果就可达很高的数量级的浓度(可到ppm量级)；达到很高的测量精度。(3) The sensitivity of the device is also very high; as long as the appropriate spectral band is selected for the polluting gas, the measurement result can reach a very high order of magnitude concentration (up to the ppm level); and achieve very high measurement accuracy.
附图说明Description of drawings
图1是本实用新型基于紫外吸收光谱H2S和SO2混合气体浓度可调波长测量装置的整体结构框架图。Figure 1 is a frame diagram of the overall structure of the utility model based on the ultraviolet absorption spectrum H 2 S and SO 2 mixed gas concentration adjustable wavelength measuring device.
图2是本实用新型基于紫外吸收光谱H2S和SO2混合气体浓度测量装置的结构示意图。Fig. 2 is a structural schematic diagram of the utility model based on the ultraviolet absorption spectrum H 2 S and SO 2 mixed gas concentration measuring device.
具体实施方式detailed description
下面将结合本实用新型实施例中的附图，对本实用新型实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本实用新型一部分实施例，而不是全部的实施例。基于本实用新型中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本实用新型保护的范围。The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. example. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.
如图1所示，本实用新型基于紫外吸收光谱的混合气体浓度可调波长测量装置包括光源模块1、紫外光波段调节模块2、混合气体注入提取模块3和气体浓度测量分析模块4；其中光源模块1、紫外光波段调节模块2、混合气体注入提取模块3和气体浓度测量分析模块4依照光源光照方向顺序排列；As shown in Figure 1, the utility model based on the ultraviolet absorption spectrum mixed gas concentration adjustable wavelength measurement device includes a light source module 1, an ultraviolet light band adjustment module 2, a mixed gas injection extraction module 3 and a gas concentration measurement and analysis module 4; wherein the light source Module 1, ultraviolet light band adjustment module 2, mixed gas injection and extraction module 3 and gas concentration measurement and analysis module 4 are arranged in sequence according to the direction of the light source;
所述的光源模块1为紫外光源，在直流电源驱动下氘灯将发出波长在160nm～450nm的紫外光；The light source module 1 is an ultraviolet light source, and the deuterium lamp will emit ultraviolet light with a wavelength of 160nm to 450nm under the drive of a DC power supply;
所述的紫外光波段调节模块2包括第一透镜201与紫外截止滤波片202两部分，光源发出的紫外光经透镜准直后；再通过可控制的通过紫外截止滤波片后进入混合气体注入提取模块3；The ultraviolet light band adjustment module 2 includes two parts, the first lens 201 and the ultraviolet cut filter 202. After the ultraviolet light emitted by the light source is collimated by the lens, it enters the mixed gas injection and extraction after passing through the ultraviolet cut filter through a controllable Module 3;
如图2所示，混合气体注入提取模块3包括样品池301、第一球阀302、样品集气瓶303、第二球阀304、真空计305、真空泵306和第二透镜307；其中光源模块1的氘灯、第一透镜201、紫外截止滤波片202、样品池301、第二透镜307前后顺次排列并同轴分布；即根据紫外光的线路按顺序同轴分布；样品集气瓶303经第一球阀302与样品池301连接；真空计305、真空泵306经第二球阀304分别与样品池301相连；As shown in Figure 2, the mixed gas injection extraction module 3 includes a sample cell 301, a first ball valve 302, a sample gas collection bottle 303, a second ball valve 304, a vacuum gauge 305, a vacuum pump 306 and a second lens 307; wherein the light source module 1 The deuterium lamp, the first lens 201, the ultraviolet cut-off filter 202, the sample pool 301, and the second lens 307 are arranged in sequence and coaxially distributed; that is, they are coaxially distributed in sequence according to the lines of ultraviolet light; the sample gas cylinder 303 passes through the first A ball valve 302 is connected to the sample pool 301; a vacuum gauge 305 and a vacuum pump 306 are respectively connected to the sample pool 301 through the second ball valve 304;
具体为：样品池301为H2S和SO2混合气体检测容器；所述的球阀302是为了控制样品集气瓶303与样品池301气体流通的阀门；真空计305是为了测定和控制样品池的压强，维持稳定的测量环境；所述球阀306是用来控制与外环境连接，排出测量后的H2S和SO2混合气体；透镜307将再一次汇聚通过样品池已经被H2S和SO2混合气体特征吸收的近紫外光束，汇聚后的光束打到气体浓度测量分析模块4的光纤401的光纤探头上；Specifically: the sample cell 301 is a H 2 S and SO 2 mixed gas detection container; the ball valve 302 is a valve for controlling the gas flow between the sample gas collection bottle 303 and the sample cell 301; the vacuum gauge 305 is for measuring and controlling the sample cell pressure to maintain a stable measurement environment; the ball valve 306 is used to control the connection with the external environment, and discharge the measured H 2 S and SO 2 mixed gas; the lens 307 will once again converge through the sample cell that has been H 2 S and The near - ultraviolet light beam absorbed by the characteristic of SO2 mixed gas, the light beam after converging hits the optical fiber probe of the optical fiber 401 of the gas concentration measurement analysis module 4;
如图2所示，所述气体浓度测量分析模块4的组成包括光纤401、光谱仪402、计算机403；其中光纤401、光谱仪402和计算机403依次连接；光纤401的光纤探头位于第二透镜307的焦点处。As shown in Figure 2, the composition of described gas concentration measurement analysis module 4 comprises optical fiber 401, spectrometer 402, computer 403; Wherein optical fiber 401, spectrometer 402 and computer 403 are connected in sequence; The optical fiber probe of optical fiber 401 is positioned at the focal point of second lens 307 place.
光谱仪402采用maya2000pro的光纤光谱仪，即插即用型，分辨率在0.3～1nm，波长宽度160～450nm，具有宽动态范围和优异的紫外线反应等，能降低电子噪声，自动消除背景光的影响，适用于低亮度和的高的紫外线灵敏度，能够满足较低浓度的待测H2S和SO2混合气体；被H2S和SO2混合气体特征吸收的近紫外光束在光谱仪中进行模/数转化处理，最后将由光谱仪转换的数字数据传递到与其相连接的计算机403上，计算机装有与光谱仪对应的数据处理软件，得到H2S和SO2混合气体的特征吸收光谱图，其中计算机403中装有Originpro8.1光谱专业制图数据分析软件；Spectrometer 402 adopts maya2000pro fiber optic spectrometer, which is plug-and-play, with a resolution of 0.3-1nm and a wavelength width of 160-450nm. It has a wide dynamic range and excellent ultraviolet response. It can reduce electronic noise and automatically eliminate the influence of background light. It is suitable for low brightness and high ultraviolet sensitivity, which can meet the lower concentration of the mixed gas of H 2 S and SO 2 to be measured; the near-ultraviolet beam characteristically absorbed by the mixed gas of H 2 S and SO 2 is analyzed in the spectrometer Conversion processing, finally the digital data converted by the spectrometer is transferred to the computer 403 connected to it, and the computer is equipped with data processing software corresponding to the spectrometer to obtain the characteristic absorption spectrum of the mixed gas of H 2 S and SO 2 , wherein in the computer 403 Equipped with Originpro8.1 spectrographic professional mapping data analysis software;
所述基于紫外吸收光谱H2S和SO2混合气体浓度可调波长测量装置工作原理和测量使用过程是：The working principle and measurement process of the adjustable wavelength measuring device based on the ultraviolet absorption spectrum H 2 S and SO 2 mixed gas concentration are:
A.首先为工作原理：本实用新型H2S和SO2混合气体浓度测量装置依靠的是技术原理是Beer-Lambert定律为理论基础并结合线型理论，采用紫外波段吸收光谱检测技术，利用混合气体中二氧化硫(SO2)和硫化氢(H2S)在190nm～230nm的吸收光谱重叠范围进行SO2和H2S的混合气体浓度测量。A. First of all, the working principle: the utility model H 2 S and SO 2 mixed gas concentration measuring device relies on the technical principle, which is the Beer-Lambert law as the theoretical basis and combined with the linear theory, adopts the ultraviolet band absorption spectrum detection technology, and uses the mixed Sulfur dioxide (SO 2 ) and hydrogen sulfide (H 2 S) in the gas are measured in the mixed gas concentration of SO 2 and H 2 S in the overlapping range of absorption spectra of 190nm to 230nm.
本实用新型对测量SO2和H2S混合气体浓度值关键的创新测量技术为：The key innovative measurement technology of the utility model for measuring the concentration value of SO 2 and H 2 S mixed gas is:
(1)首先测量计算混合气体中SO2的浓度值，因为H2S气体的吸收光谱不会对测SO2的浓度值时所需的SO2的特征吸收光谱造成影响，由Beer-Lambert定律计算公式可知，对于SO2气体的浓度值可以由其特征吸收光谱的峰谷比来反映，然后再根据所测混合气体光谱的峰谷特性，选择吸收光谱上波长几个非常接近的峰谷来推导气体SO2的浓度值，本实用新型自己编写了一段采集计算SO2的浓度峰谷比的程序，利用编写的程序直接准确的得到多组SO2气体特征吸收峰谷值，在对几组峰谷比值求得平均值，最后通过程序直接得到所测SO2的精确浓度值。( 1 ) First measure and calculate the concentration value of SO2 in the mixed gas, because the absorption spectrum of H2S gas will not affect the characteristic absorption spectrum of SO2 required when measuring the concentration value of SO2, according to the Beer - Lambert law The calculation formula shows that the concentration value of SO2 gas can be reflected by the peak-to-valley ratio of its characteristic absorption spectrum, and then according to the peak-to-valley characteristics of the measured mixed gas spectrum, select several peaks and valleys with very close wavelengths on the absorption spectrum Deduce the concentration value of gas SO 2 , the utility model has written a section of program that collects and calculates the concentration peak-valley ratio of SO 2 , and utilizes the program written to directly and accurately obtain multiple groups of SO 2 gas characteristic absorption peak-valley values. The peak-to-valley ratio is used to obtain the average value, and finally the precise concentration value of the measured SO 2 is directly obtained through the program.
(2)以往的技术很难将H2S气体的吸收光谱从SO2和H2S混合气体的光谱中提取出来，而且从光谱技术来说单独测量H2S气体浓度技术方法也很少，本实用新型开创了一种简单有效的H2S气体浓度测量技术手段，首先利用SO2和H2S混合气体的光谱数据值减去混合气体中相应的SO2气体吸收光谱数据值来获得H2S气体的吸收光谱的技术，并通过先采集无待测气体时的背底光谱图，利用背地光谱的数据减去单独H2S气体的光谱图的数据后再除以背底光谱数据来得到H2S气体的特征吸收峰图，之后根据线性理论拟合出H2S气体特征吸收峰与其浓度值的线性曲线，最后H2S气体的浓度值可由将特征吸收峰直接代入所拟合好的线性曲线得到。(2) It is difficult to extract the absorption spectrum of H 2 S gas from the spectrum of SO 2 and H 2 S mixed gas in the past technology, and there are few technical methods to measure the concentration of H 2 S gas separately in terms of spectral technology. The utility model creates a simple and effective H 2 S gas concentration measurement technique. First, the H 2 S gas concentration is obtained by subtracting the corresponding SO 2 gas absorption spectrum data value in the mixed gas from the spectral data value of the SO 2 and H 2 S mixed gas. 2 S gas absorption spectrum technology, and by first collecting the background spectrum when there is no gas to be measured, subtracting the data of the spectrum of H 2 S gas alone from the data of the background spectrum and then dividing it by the background spectrum data Obtain the characteristic absorption peak diagram of H 2 S gas, and then fit the linear curve between the characteristic absorption peak of H 2 S gas and its concentration value according to the linear theory, and finally the concentration value of H 2 S gas can be fitted by directly substituting the characteristic absorption peak into A good linear curve is obtained.
(3)本实用新型在测量装置方面创新的设置了紫外光波段调节模块，即在光源与开始的透镜之间设置一个紫外截止滤波片，可以手动调节入射到样品池光的波长，把波长截止到200nm范围内，因为H2S气体的特征吸收峰在190nm～200nm范围内，而SO2气体在此波段特征吸收很弱，把其他200nm以上的波段光截止掉也对应的增强了待测气体在此波段光的有效吸收；这样就能更好更精确的测量出H2S气体的浓度。(3) The utility model is innovatively equipped with an ultraviolet band adjustment module in the measurement device, that is, an ultraviolet cut-off filter is set between the light source and the initial lens, which can manually adjust the wavelength of the light incident on the sample cell, and cut off the wavelength In the range of 200nm, because the characteristic absorption peak of H 2 S gas is in the range of 190nm to 200nm, and the characteristic absorption of SO 2 gas in this band is very weak, cutting off the light in other bands above 200nm also correspondingly enhances the gas to be tested Effective absorption of light in this band; in this way, the concentration of H 2 S gas can be measured better and more accurately.
B.本实用新型测量使用过程：首先通过氘灯光源发出近紫外的光，光源需稳定一小段时间，防止刚打开电源时氘灯发出紫外光纤会发生扰动而影响装置对SO2和H2S混合气体浓度测量结果的精度造成影响；光源发出的紫外先通过可调节的紫外截止滤波片后再经透镜准直紫外光；然后再将得到准直后的紫外平行光束通过样品池301；之后再打开球阀302将集气瓶303中待测浓度的SO2和H2S混合气体注入到样品池中，之后近紫外光束再通过样品池时经所要测的SO2和H2S混合气体特征吸收后，再经过透镜307汇聚到光纤401的光纤探头上；然后在经光纤传输到光谱仪402内，经光谱仪对传输的数据进行数据转换，主要是经模/数转化，最后输入到计算机403进行处理，在用光谱仪专用软件显示出光谱信号的图形曲线；最后再对测得数据与光谱图进行处理分析。B. The measurement and use process of the utility model: first, the light source of the deuterium lamp emits near-ultraviolet light, and the light source needs to be stabilized for a short period of time to prevent the disturbance of the ultraviolet optical fiber emitted by the deuterium lamp when the power is turned on, which will affect the device’s response to SO 2 and H 2 S The accuracy of the mixed gas concentration measurement results is affected; the ultraviolet rays emitted by the light source first pass through the adjustable ultraviolet cut-off filter and then collimate the ultraviolet light through the lens; then the collimated ultraviolet parallel beams pass through the sample cell 301; Open the ball valve 302 to inject the mixed gas of SO 2 and H 2 S with the concentration to be measured in the gas collecting bottle 303 into the sample cell, and then the near-ultraviolet light beam is absorbed by the characteristic absorption of the mixed gas of SO 2 and H 2 S when it passes through the sample cell Afterwards, it is converged to the optical fiber probe of the optical fiber 401 through the lens 307; then it is transmitted to the spectrometer 402 through the optical fiber, and the transmitted data is converted by the spectrometer, mainly through analog/digital conversion, and finally input to the computer 403 for processing , using the special software for the spectrometer to display the graphic curve of the spectral signal; finally, process and analyze the measured data and the spectrogram.
实施例1Example 1
本实施例采用上述连接关系，其中光源机构采用直流驱动的氘灯光源，用于得到近紫外光束，所述光谱仪402采用maya2000pro的光纤光谱仪，用于接受采集通过样品池后已经由气体特征吸收的近紫外光，对数据进行模/数转化处理。This embodiment adopts the above-mentioned connection relationship, wherein the light source mechanism adopts a deuterium lamp light source driven by DC to obtain near-ultraviolet light beams, and the spectrometer 402 adopts a fiber optic spectrometer of maya2000pro, which is used to receive and collect light that has been absorbed by the gas characteristics after passing through the sample pool Near-ultraviolet light is used for analog/digital conversion processing of data.
本实用新型未述及之处适用于现有技术。The unmentioned part of the utility model is applicable to the prior art.
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