Tian Wang, Wei Wu, Ziyunxin Zhang. Design of non-contact measurement system for ethanol concentration using near infrared spectrometry characteristics[J]. Infrared and Laser Engineering, 2023, 52(12): 20230510

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- Infrared and Laser Engineering
- Vol. 52, Issue 12, 20230510 (2023)

Fig. 1. Light sources and sensors. (a) Infrared LED light source; (b) InGaAs photodiode

Fig. 2. Schematic diagram of the experimental setup

Fig. 3. Photodiode drive circuit

Fig. 4. ADS1115 circuit

Fig. 5. Actual diagram of the installation

Fig. 6. The linear relationship between alcohol concentration value and voltage value

Fig. 7. A quadratic polynomial relationship between alcohol concen-tration values and voltage values
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Table 1. Comparison table of different alcohol concen-tration values and corresponding voltage values
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Table 2. Comparison of measured and standard values
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Table 3. Repeat and continuous measurements at the same concentration

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