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首页> 外文会议>International Seminar on Intelligent Technology and Its Applications >Non-Dispersive Infrared (NDIR) sensor design and its application on alcohol detection
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Non-Dispersive Infrared (NDIR) sensor design and its application on alcohol detection

机译：非分散红外（NDIR）传感器设计及其在酒精检测中的应用

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Alcohol concentration measurement becomes very important in mixing a chemical solution. The measurement in general uses a conventional method that requires direct contact and a long time of measurement period, such as using a capacitive sensor. Another method is Non-Dispersive Infrared (NDIR) which is capable of measuring the concentration of alcohol without any direct contact and within relatively short test period. In NDIR system, infrared light generated by an infrared source passes through the sample tube. Then, the infrared light that can be absorbed by the hydrocarbon particles of the alcohol is sensed by an infrared detector. In this paper, the infrared source is made of inexpensive 19 Gauge nichrome wire heated at different temperatures to find the best alcohol absorption. PID controller system is employed to maintain constant temperature of the infrared source. The infrared light absorbed is then detected by a thermopile sensor. The result showed that the best alcohol absorption is at 60 °C, and it is proportional to the magnitude of the concentration, the greater the concentration, the higher the value of its absorbance. Absorbance value for distilled water is 0 while the absorbance value for 20% alcohol is at 0.15 and for 60% alcohol is 0.26. This proves that the higher the concentration of alcohol, the infrared light absorbed will be higher. Overall, the inexpensive NDIR system is capable of observing and detecting alcohol that may be used for other solutions in further research.
机译：酒精浓度的测量在混合化学溶液时变得非常重要。该测量通常使用需要直接接触并且需要较长测量时间的常规方法，例如使用电容传感器。另一种方法是非分散红外（NDIR），它能够在相对短的测试时间内无需任何直接接触即可测量酒精的浓度。在NDIR系统中，由红外源产生的红外光穿过样品管。然后，可以被醇的烃颗粒吸收的红外光由红外检测器感测。在本文中，红外光源由便宜的19规格镍铬合金丝制成，在不同温度下加热以获得最佳的酒精吸收。 PID控制器系统用于维持红外光源的恒定温度。然后由热电堆传感器检测吸收的红外光。结果表明，最佳酒精吸收温度为60°C，且与浓度的大小成正比，浓度越大，其吸光度值越高。蒸馏水的吸光度值为0，而20％酒精的吸光度值为0.15，而60％酒精的吸光度值为0.26。这证明酒精浓度越高，吸收的红外光就越高。总的来说，廉价的NDIR系统能够观察和检测酒精，这些酒精可用于进一步研究的其他解决方案。

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