【Hacker News搬运】低成本二氧化碳传感器比较:光声与NDIR
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Title: Low Cost CO2 Sensors Comparison: Photo-Acoustic vs. NDIR
低成本二氧化碳传感器比较:光声与NDIR
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Url: https://www.airgradient.com/blog/co2-sensors-photo-acoustic-vs-ndir-updated/
很抱歉,我无法直接访问外部网站来获取内容。不过,我可以根据你提供的链接和标题来推测内容的大致方向,并给出一个可能的总结。 标题:“CO2传感器:光声与NDIR技术的比较(更新)” 可能的总结: 这篇文章可能探讨了两种流行的二氧化碳(CO2)传感器技术:光声(Photoacoustic)和NDIR(非分散红外)技术。作者可能会对比这两种技术的原理、性能、应用场景以及优缺点。 1. **原理比较**: - 光声技术:通过检测光声效应来测量气体浓度,即当光照射到气体分子上时,分子振动产生声波。 - NDIR技术:通过检测气体分子对特定波长红外光的吸收来测量浓度。 2. **性能比较**: - 光声传感器可能具有更高的灵敏度和更快的响应时间。 - NDIR传感器可能更加稳定,成本较低,易于维护。 3. **应用场景**: - 光声传感器可能适用于需要高精度和高灵敏度测量的场合,如科研和工业。 - NDIR传感器可能更适用于商业和民用市场,如家庭和办公室的CO2监测。 4. **优缺点**: - 光声技术的优点是高精度和快速响应,但可能成本较高。 - NDIR技术的优点是成本较低,易于使用,但可能精度稍低。 请注意,这只是一个基于标题的推测,实际内容可能有所不同。如果你需要具体的翻译或分析,你可能需要访问该链接并使用在线翻译工具或相关软件来获取详细内容。
Post by: todsacerdoti
Comments:
matznerd: Not sure what people are interested in CO2 sensors for, but I use them as a proxy for ventilation in indoor spaces, which is then a proxy for covid risk.<p>It won't tell you if the air is being filtered (need MERV13 or better), but a lot of places for efficiency and/or due to old HVAC equipment don't bring in fresh air, which increases the risk in a more confined and/or crowded space.<p>Also, some places like airplanes, which have HEPA filters and have 10-20 air changes per hour (ACH), don't run those systems at full power or bring in outside air at fast enough rate until airborne, so PPM can't build up to 2000 ppm vs the ~420 ambient outdoor CO2 level and approx 800 "good" indoor air rate.<p>I use an Aranet4 device, which uses 2 AA batteries that last like a year.
matznerd: 不确定人们对二氧化碳传感器感兴趣的是什么,但我用它们来代替室内空间的通风,这就是新冠肺炎风险的代表<p> 它赢了;我不会告诉你空气是否经过过滤(需要MERV13或更好),但有很多地方可以提高效率;或者由于旧的HVAC设备不起作用;不会引入新鲜空气,这会增加在更封闭和更舒适的环境中的风险;或拥挤的空间<p> 此外,一些地方,如飞机,有HEPA过滤器,每小时换气10-20次(ACH),没有;在升空之前,不要以全功率运行这些系统或以足够快的速度引入外部空气,因此PPM可以;t与约420的室外环境二氧化碳水平相比,上升到2000ppm,约为800”;良好";室内空气流量<p> 我使用的是Aranet4设备,它使用两节AA电池,续航时间大约一年。
lucubratory: I strongly recommend the Aranet4 Home for personal/home use. Very accurate, very long-lasting, tells you other things like humidity etc, and only 1-2 hundred dollars when we bought it (may be more expensive now, been a couple years of inflation).
lucubratory: 我强烈推荐Aranet4 Home for personal;家用。非常准确,非常持久,告诉你其他东西,比如湿度等,当我们买的时候只有1-2百美元(现在可能更贵,经过几年的通货膨胀)。
fotta: I have an SCD30 which is a dual-channel NDIR sensor and am pretty happy with it. Once a year I’ll take it outside to recalibrate it and it’s never drifted more than a few ppm. I make sure to turn off the auto-calibration and manually calibrate it because auto-calibration can lead to weird behavior if you don’t know what it’s doing (it re-baselines the lowest observed ppm in a time window as 400ppm).
fotta: 我有一个SCD30,它是一个双通道NDIR传感器,我对它很满意。每年我都会把它带到外面重新校准,它的漂移永远不会超过几个ppm。我确保关闭自动校准并手动校准,因为如果你不知道它在做什么,自动校准可能会导致奇怪的行为(它将时间窗口中观察到的最低ppm重新基线为400ppm)。
breput: I've used both the SenseAir S8 and Sensirion SCD41 sensors, and the SenseAir is clearly my favorite.<p>The SCD41 seems to require a lot more manual calibration while the S8 is very stable - maybe once every 3 months or so, I'll see it reporting ~380 ppm in fresh air (which is actually within spec).<p>The venerable MH-Z19 is probably my second favorite sensor, ahead of the SCD40-series.
breput: 我;我使用了SenseAir S8和Sensirion SCD41传感器,SenseAir显然是我最喜欢的<p> SCD41似乎需要更多的手动校准,而S8非常稳定——可能每3个月左右一次,我;我会看到它在新鲜空气中报告约380ppm(实际上在规格范围内)<p> 历史悠久的MH-Z19可能是我第二喜欢的传感器,排在SCD40系列之前。
amoshebb: I’ve never heard of any of these. What’s going on in low cost oxygen sensors? What should I google? I can only find $100+ galvanic sensors that need to be replaced after a few dozen months
amoshebb: 我从未听说过这些。低成本氧气传感器是怎么回事?我应该用谷歌搜索什么?我只能找到几十个月后需要更换的100美元以上的电流传感器