Development of O_2 and CO_2 measurement system for science education

在这项研究中，我们为科学教育开发了一套易于操作的O2和CO2测量系统。我们使用了一种易于制作的手工制作的膜片电池式传感器作为O2传感器。这种氧气传感器不仅可以测量空气中的氧气浓度，还可以测量溶液中的氧气浓度，适合作为一种教育工具。该系统采用固体电解液传感器模块作为CO_2传感器，利用O_2和CO_2传感器的组合，实现了对O_2和CO_2浓度的自动同步测量。我们还开发了使用商用电子表格软件的测量软件，方法是使用USB连接将传感器与PC连接。最重要的优点是能够可视化O_2和CO_2等不可见和无味气体的浓度随时间的变化。我们使用O_2和CO_2测量系统测量了作者呼出的空气，测量了浅呼气和深呼气。第一，浅显的I…更多吸入的空气被呼入呼气袋。然后，空气被深深地吸入并保持30秒，然后被呼出到袋子里。每隔5秒采样一次，连续90秒测量每个样品的O2和CO2浓度，结果表明，浅呼气时的O2浓度从20.8%下降到18.6%。另一方面，CO_2浓度为17.8ppm，这是大气CO_2浓度的增加。深度呼气时O2浓度由20.9%降至16.8%，降幅约为4.1%。另一方面，二氧化碳浓度为2.4ppm。总之，任何人都可以使用呼气袋和传感器系统轻松测量浅呼气和深呼气时氧气和二氧化碳浓度随时间的变化。我们还可以轻松地进行实验，并获得高精度的数据。这一传感器系统可以作为自然科学研究的一种教育工具来推广“生命”的基本概念。较少

In this study, we developed an easy-to-operate O_2 and CO_2 measurement system for science education. We used an easily-prepared hand-made diaphragm galvanic cell-type sensor as the O_2 sensor. This O_2 sensor can measure not only the oxygen concentration in air, but also in a solution, making it suitable as an educational tool. We used a solid electrolyte-type sensor module as the CO_2 sensor.This system makes automatic and simultaneous measurements of O_2 and CO_2 concentration possible using the combination of the O_2 and CO_2 sensors. We also developed measurement software using commercially available spreadsheet software by connecting the sensor with a PC using a USB connection. The most important advantage is to be able to visualize the changes in the concentration of invisible and odorless gases such as O_2 and CO_2 as a function of time.We measured the author's expired air using the O_2 and CO_2 measurement system, measuring both shallow and deep expirations. First, shallowly i … More nhaled air is exhaled into an expiration bag. Then, air is deeply inhaled and held for 30 seconds before being exhaled into the bag. We sampled the air every 5 seconds and measured the O_2 and CO_2 concentration of each sample for 90 seconds.In respect to the results, the O_2 concentration in shallow expiration was decreased from 20.8% to 18.6%. On the other hand, the CO_2 concentration was 17, 8ppm, which was an increase the atmospheric CO_2 concentration. The O_2 concentration in deep expiration was observed to decrease by about 4.1% from 20.9% to 16.8%. On the other hand, the CO_2 concentration was 2, 4ppm.In conclusion, anyone can easily measure changes in the O_2 and CO_2 concentration as a function of time in shallow and deep expiration using an expiration bag and the sensor system. We can also carry out experiments easily and obtain highly accurate data. This sensor system can be expected to promote the basic concept of"Life"as an educational tool for the study of natural science. Less