CN207816810U - The calibrating installation of Long path differential optical absorption spectroscopy air quality monitor - Google Patents
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Abstract
本实用新型公开了一种长程差分吸收光谱空气质量监测仪的校准装置,包括圆柱形的气体光学吸收腔，所述气体光学吸收腔的一个端面上设有进气口，另一个端面上设有出气口；所述圆柱形的气体光学吸收腔的端面直径为300～500mm，柱高为100～300mm；所述进气口的孔径在30mm以内；所述出气口的孔径在30mm以内；所述气体光学吸收腔由远紫外类石英玻璃或紫外类石英玻璃制成。本实用新型能够在工况状态下对长程差分吸收光谱空气质量监测仪的浓度参数量值溯源指标进行检测以及校准，提高了校准的准确度及稳定性。本实用新型还具有体积小、结构简单、操作方便、易于携带等特点。
The utility model discloses a calibration device for a long-distance differential absorption spectrum air quality monitor, which comprises a cylindrical gas optical absorption cavity, one end surface of the gas optical absorption cavity is provided with an air inlet, and the other end surface is provided with a Gas outlet; the diameter of the end surface of the cylindrical gas optical absorption cavity is 300-500mm, and the column height is 100-300mm; the aperture of the air inlet is within 30mm; the aperture of the gas outlet is within 30mm; The gas optical absorption cavity is made of far ultraviolet quartz glass or ultraviolet quartz glass. The utility model can detect and calibrate the traceability index of the concentration parameter value of the long-distance differential absorption spectrum air quality monitor under the working condition, and improves the accuracy and stability of the calibration. The utility model also has the characteristics of small size, simple structure, convenient operation, easy to carry and the like.
Description
技术领域technical field
本实用新型涉及计量检测技术，更具体地说，是涉及一种长程差分吸收光谱空气质量监测仪的校准装置。The utility model relates to measurement and detection technology, in particular to a calibration device for a long-distance differential absorption spectrum air quality monitor.
背景技术Background technique
在对大气中的痕量挥发性有机物以及有毒有害物的测量过程中，光学在线监测技术是一种有效方法。相较于传统的化学法，光学法因为响应快、维护简易而广泛应用于环境监测。目前光学法主要包括长程差分吸收光谱法(Long Path Differential OpticalAbsorption Spectroscopy，简称LP-DOAS)、傅里叶红外变换光谱技术(Fourier transforminfrared spectroscopy，简称FTIR)和调谐二极管激光吸收光谱法(Tunable diode laserabsorption spectrometry，简称TDLAS)。In the process of measuring trace volatile organic compounds and toxic and harmful substances in the atmosphere, optical online monitoring technology is an effective method. Compared with traditional chemical methods, optical methods are widely used in environmental monitoring because of their fast response and easy maintenance. At present, optical methods mainly include Long Path Differential Optical Absorption Spectroscopy (LP-DOAS for short), Fourier transform infrared spectroscopy (FTIR for short) and Tunable diode laser absorption spectroscopy (Tunable diode laser absorption spectroscopy). , referred to as TDLAS).
其中，LP-DOAS技术具有测量速度快、精度高、分辨率高、测定波段宽、杂散光低以及信号多路传输等特点，不仅不需采样及样品的预处理，而且还可以实现无损分析，这样就可以同时对多种气体污染物进行在线自动测量，主要应用于工业区特征污染物定性或定量的动态分析，已被国内外环境监测及科研领域广泛应用。但长程差分吸收光谱空气质量监测仪的运行性能特征状况不确定度高，亟需经常对其进行量值溯源。Among them, LP-DOAS technology has the characteristics of fast measurement speed, high precision, high resolution, wide measurement band, low stray light and signal multiplex transmission. Not only does it not require sampling and sample pretreatment, but it can also achieve non-destructive analysis. In this way, multiple gas pollutants can be measured online and automatically at the same time. It is mainly used in the qualitative or quantitative dynamic analysis of characteristic pollutants in industrial areas. It has been widely used in environmental monitoring and scientific research fields at home and abroad. However, the operating performance characteristics of the long-range differential absorption spectroscopy air quality monitor have high uncertainty, and it is urgent to trace the source of its value frequently.
目前，对于长程差分吸收光谱空气质量监测仪的校准大多停留于实验室状态，所谓的实验室状态，是指将待校准仪器完全设置在充满标准气体的吸收光池中，这样，待校准仪器的观测光路完全在吸收光池中。而在工况状态即对空气中的污染气体进行实时测量时，长程差分吸收光谱空气质量监测仪的观测光路则暴露在由多种组分(包括固态颗粒物、气态污染物以及液态雾滴等)组成的空气中，环境条件与实验室状态有较大差别。并且实验室的吸收光池多为长几米、重达上百千克的设备构成，难以携带到工况条件下运用。At present, the calibration of long-range differential absorption spectroscopy air quality monitors mostly stays in the laboratory state. The so-called laboratory state means that the instrument to be calibrated is completely set in the absorption light cell filled with standard gas, so that the instrument to be calibrated The observation light path is completely in the absorption light cell. In the working condition, that is, when the polluting gases in the air are measured in real time, the observation optical path of the long-range differential absorption spectroscopy air quality monitor is exposed to various components (including solid particles, gaseous pollutants, and liquid droplets, etc.) The composition of the air, environmental conditions and laboratory conditions are quite different. Moreover, most of the optical absorption cells in the laboratory are composed of equipment with a length of several meters and a weight of hundreds of kilograms, which is difficult to carry and use under working conditions.
实用新型内容Utility model content
针对现有技术中存在的缺陷，本实用新型的目的是提供一种长程差分吸收光谱空气质量监测仪的校准装置。Aiming at the defects existing in the prior art, the purpose of the utility model is to provide a calibration device for a long-distance differential absorption spectrum air quality monitor.
为达到上述目的，本实用新型采用如下的技术方案：In order to achieve the above object, the utility model adopts the following technical solutions:
一种长程差分吸收光谱空气质量监测仪的校准装置,包括圆柱形的气体光学吸收腔，所述气体光学吸收腔的一个端面上设有进气口，另一个端面上设有出气口；A calibration device for a long-range differential absorption spectrum air quality monitor, comprising a cylindrical gas optical absorption cavity, one end surface of the gas optical absorption cavity is provided with an air inlet, and the other end surface is provided with an air outlet;
所述圆柱形的气体光学吸收腔的端面直径为300～500mm，柱高为100～300mm；The diameter of the end surface of the cylindrical gas optical absorption cavity is 300-500 mm, and the column height is 100-300 mm;
所述进气口的孔径在30mm以内；The aperture of the air inlet is within 30mm;
所述出气口的孔径在30mm以内；The aperture of the air outlet is within 30mm;
所述气体光学吸收腔由远紫外类石英玻璃或紫外类石英玻璃制成。The gas optical absorption cavity is made of far ultraviolet quartz glass or ultraviolet quartz glass.
所述圆柱形的气体光学吸收腔的端面直径与柱高的比例为7:3。The ratio of the diameter of the end face of the cylindrical gas optical absorption cavity to the height of the column is 7:3.
所述进气口与所述出气口中的一个气口设于相应端面的顶部，另一个气口则设于相应端面的底部。One of the air inlet and the air outlet is arranged on the top of the corresponding end surface, and the other air outlet is arranged on the bottom of the corresponding end surface.
所述圆柱形的气体光学吸收腔的侧面上还固设把手。A handle is also fixed on the side of the cylindrical gas optical absorption cavity.
还包括水平支架，所述水平支架设于所述圆柱形的气体光学吸收腔的下方。A horizontal bracket is also included, and the horizontal bracket is arranged under the cylindrical gas optical absorption cavity.
与现有技术相比，采用本实用新型的一种长程差分吸收光谱空气质量监测仪的校准装置，能够在工况状态下对长程差分吸收光谱空气质量监测仪的浓度参数量值溯源指标进行检测以及校准，提高了校准的准确度及稳定性。本实用新型还具有体积小、结构简单、操作方便、易于携带等特点。Compared with the prior art, the calibration device of a long-range differential absorption spectrum air quality monitor of the present invention can detect the traceability index of the concentration parameter value of the long-range differential absorption spectrum air quality monitor under working conditions And calibration, which improves the accuracy and stability of calibration. The utility model also has the characteristics of small size, simple structure, convenient operation, easy to carry and the like.
附图说明Description of drawings
图1为本实用新型的一种长程差分吸收光谱空气质量监测仪的校准装置的原理示意图。FIG. 1 is a schematic diagram of the principle of a calibration device for a long-distance differential absorption spectrum air quality monitor of the present invention.
具体实施方式Detailed ways
下面结合附图和实施例进一步说明本实用新型的技术方案。The technical scheme of the utility model is further described below in conjunction with the accompanying drawings and embodiments.
请参阅图1所示的一种长程差分吸收光谱空气质量监测仪的校准装置,包括圆柱形的气体光学吸收腔11，气体光学吸收腔的一个端面上设有进气口12，其孔径在30mm以内。另一个端面上设有出气口13，其孔径在30mm以内。Please refer to the calibration device of a long-distance differential absorption spectrum air quality monitor shown in Figure 1, including a cylindrical gas optical absorption cavity 11, an air inlet 12 is provided on one end of the gas optical absorption cavity, and its aperture is 30mm within. The other end face is provided with an air outlet 13, and its aperture is within 30mm.
圆柱形的气体光学吸收腔的端面直径为300～500mm，柱高为100～300mm。The diameter of the end surface of the cylindrical gas optical absorption cavity is 300-500 mm, and the column height is 100-300 mm.
长程差分吸收光谱空气质量监测仪目前所采用的光学波段绝大多数为紫外(UV)波段，因此构成气体光学吸收腔的石英玻璃的材质必须确保紫外波段(也就是LP-DOAS的工作波段)光束穿过气体光学吸收腔，而一般玻璃材质则会吸收该波段，致使测量误差极大。Most of the optical bands currently used by long-range differential absorption spectroscopy air quality monitors are ultraviolet (UV) bands, so the material of the quartz glass that constitutes the gas optical absorption cavity must ensure that the beams in the ultraviolet band (that is, the working band of LP-DOAS) Passing through the gas optical absorption cavity, the general glass material will absorb this wave band, resulting in a large measurement error.
现有技术中，石英玻璃中的二氧化硅成分应达到99.99％以上，硬度达到莫式七级。根据校准物种的所在光学波段，具体选择对应的石英玻璃类。石英玻璃按其光学性能可分为三类：In the prior art, the silica content in the quartz glass should reach more than 99.99%, and the hardness should reach Mohs 7. According to the optical band of the calibration species, select the corresponding quartz glass type. Quartz glass can be divided into three categories according to its optical properties:
远紫外类JGS1:在紫外和可见光谱范围内透明；在185～250nm波段范围内无吸收带；在2600～2800nm波段范围内有强吸收带；非发光，光辐射稳定。Far-ultraviolet type JGS1: transparent in the ultraviolet and visible spectrum; no absorption band in the 185-250nm band; strong absorption band in the 2600-2800nm band; non-luminescent, stable light radiation.
紫外类JGS2:在紫外和可见光谱范围内透明；在200～250nm波段范围内无吸收带；在2600～2800nm波段范围内有强吸收带；非发光，光辐射稳定。UV class JGS2: transparent in the ultraviolet and visible spectrum range; no absorption band in the range of 200-250nm; strong absorption band in the range of 2600-2800nm; non-luminescent, stable light radiation.
红外类JGS3:在可见和红外光谱范围内透明；在2600～2800nm波段范围内无明显吸收带。Infrared JGS3: transparent in the visible and infrared spectral range; no obvious absorption band in the 2600-2800nm band.
本方案中使用的是JGS1或JGS2类。The JGS1 or JGS2 classes are used in this scenario.
同时，用石英玻璃材料制作的圆柱形主体结构表面张力小，颗粒物不易被其表面吸附，而颗粒物的附着会影响观测光路的通过，造成仪器浓度的计算误差，进而影响校准结果。因此，在校准工作中采用石英玻璃材料作为主体结构具有良好的重复性和稳定性。At the same time, the surface tension of the cylindrical main structure made of quartz glass material is small, and particles are not easily adsorbed by its surface, and the attachment of particles will affect the passage of the observation light path, resulting in the calculation error of the instrument concentration, which in turn affects the calibration results. Therefore, the use of quartz glass material as the main structure in the calibration work has good repeatability and stability.
再请看图所示，气体光学吸收腔的侧面下方还设有与其相连的水平支架14，使得气体光学吸收腔的轴线能够保持在水平方向。需要说明的是，水平支架还可以采用单体结构，使用时只要将气体光学吸收腔的侧面放在上面即可保持腔体轴线的水平。As shown in the figure again, a horizontal bracket 14 connected to the side of the gas optical absorption cavity is also provided, so that the axis of the gas optical absorption cavity can be kept in the horizontal direction. It should be noted that the horizontal support can also adopt a monolithic structure, and the axis of the cavity can be kept horizontal as long as the side of the gas optical absorption cavity is placed on it during use.
气体光学吸收腔上还固设一个方便携带的把手15。A convenient handle 15 is also fixed on the gas optical absorption chamber.
经反复论证，当圆柱形的气体光学吸收腔的端面直径与柱高的比例为7:3时，气体光学吸收腔内的吸收气体在一定时间内的混合最为均匀。特别是所述圆柱形的气体光学吸收腔的端面直径为350mm，柱高为150mm时，在现场工况条件下操作最为科学、方便，即气体光学吸收腔中能够在最短时间内稳定驻留标准浓度气体，且腔内气体均匀分布，同时易于携带。After repeated demonstrations, when the ratio of the end diameter of the cylindrical gas optical absorption cavity to the column height is 7:3, the absorption gas in the gas optical absorption cavity is mixed most uniformly within a certain period of time. In particular, when the end face diameter of the cylindrical gas optical absorption cavity is 350 mm and the column height is 150 mm, it is the most scientific and convenient to operate under field conditions, that is, the gas optical absorption cavity can stably reside in the shortest time. Concentrated gas, and the gas in the cavity is evenly distributed, and it is easy to carry.
并且由图中所示可知，当进气口与出气口之间的直线距离越长充入的气体越容易在较短的时间内充满整个腔体。因此，图中的进气口位于端面的底部，出气口位于端面的顶部，反之亦然。较佳地，进气口以及出气口的孔径均为10mm。And it can be seen from the figure that the longer the linear distance between the air inlet and the air outlet, the easier it is for the gas to fill the entire cavity in a shorter time. Therefore, the air inlet in the figure is located at the bottom of the end face, and the air outlet is located at the top of the end face, and vice versa. Preferably, the apertures of the air inlet and the air outlet are both 10mm.
使用时，将带有解压阀门和流量调节装置的标准气体连接到进气口12，使得定量浓度的标准气体进入气体光学吸收腔11中，同时，将尾气处理装置连接到出气口13，防止污染环境空气。待流量稳定后，关闭进气口12与出气口13，使得气体光学吸收腔11呈现密闭状态。并确保待校准的长程差分吸收光谱空气质量监测仪的观测光路沿图中的箭头方向(即气体光学吸收腔的轴向)水平通过气体光学吸收腔11。如此按要求操作，就能按照计量法中的相关规定对待校的长程差分吸收光谱空气质量监测仪在工况状态下相应的被溯源量值指标如浓度参数等进行检测，还可以方便计算浓度示值误差、浓度重复性以及浓度稳定性等性能指标。When in use, connect the standard gas with decompression valve and flow regulating device to the inlet 12, so that the standard gas of quantitative concentration enters the gas optical absorption chamber 11, and at the same time, connect the tail gas treatment device to the gas outlet 13 to prevent pollution ambient air. After the flow is stabilized, the gas inlet 12 and the gas outlet 13 are closed, so that the gas optical absorption cavity 11 is in a sealed state. And ensure that the observation optical path of the long-distance differential absorption spectrum air quality monitor to be calibrated passes through the gas optical absorption cavity 11 horizontally along the direction of the arrow in the figure (ie, the axial direction of the gas optical absorption cavity). By operating according to the requirements in this way, the long-distance differential absorption spectrum air quality monitor to be calibrated can be tested in accordance with the relevant regulations in the measurement method, and the corresponding traceable value indicators such as concentration parameters can be detected under working conditions, and the concentration can also be conveniently calculated. Performance indicators such as value error, concentration repeatability and concentration stability.
校准工作结束后，将气泵连接到进气口12。通过吹扫，使气体光学吸收腔11中的残留气体通入尾气处理装置后排出。After the calibration work, connect the air pump to the air inlet 12. By purging, the residual gas in the gas optical absorption chamber 11 is passed into the tail gas treatment device and then discharged.
本技术领域中的普通技术人员应当认识到，以上的实施例仅是用来说明本实用新型的目的，而并非用作对本实用新型的限定，只要在本实用新型的实质范围内，对以上所述实施例的变化、变型都将落在本实用新型的权利要求的范围内。Those of ordinary skill in the art should recognize that the above embodiments are only used to illustrate the purpose of the utility model, rather than as a limitation of the utility model, as long as within the essential scope of the utility model, the above-mentioned The changes and modifications of the above embodiments will fall within the scope of the claims of the present utility model.
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| CN111141694A (en) * | 2019-12-16 | 2020-05-12 | 交通运输部公路科学研究所 | Calibration device and method for tunnel carbon monoxide content detector based on infrared absorption method |
| CN111323544A (en) * | 2020-03-27 | 2020-06-23 | 沈阳沃尔鑫环保科技有限公司 | Calibration method and system based on miniature air quality monitoring instrument |
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|---|---|---|---|---|
| CN111141694A (en) * | 2019-12-16 | 2020-05-12 | 交通运输部公路科学研究所 | Calibration device and method for tunnel carbon monoxide content detector based on infrared absorption method |
| CN111323544A (en) * | 2020-03-27 | 2020-06-23 | 沈阳沃尔鑫环保科技有限公司 | Calibration method and system based on miniature air quality monitoring instrument |
| CN111323544B (en) * | 2020-03-27 | 2022-09-20 | 沈阳沃尔鑫环保科技有限公司 | Calibration method and system based on miniature air quality monitoring instrument |
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