• Infrared and Laser Engineering
  • Vol. 52, Issue 12, 20230510 (2023)
Tian Wang, Wei Wu, and Ziyunxin Zhang
Author Affiliations
  • School of Physics and Electronic Science, Guizhou Education University, Guiyang 550018, China
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    DOI: 10.3788/IRLA20230510 Cite this Article
    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 Copy Citation Text show less
    Light sources and sensors. (a) Infrared LED light source; (b) InGaAs photodiode
    Fig. 1. Light sources and sensors. (a) Infrared LED light source; (b) InGaAs photodiode
    Schematic diagram of the experimental setup
    Fig. 2. Schematic diagram of the experimental setup
    Photodiode drive circuit
    Fig. 3. Photodiode drive circuit
    ADS1115 circuit
    Fig. 4. ADS1115 circuit
    Actual diagram of the installation
    Fig. 5. Actual diagram of the installation
    The linear relationship between alcohol concentration value and voltage value
    Fig. 6. The linear relationship between alcohol concentration value and voltage value
    A quadratic polynomial relationship between alcohol concen-tration values and voltage values
    Fig. 7. A quadratic polynomial relationship between alcohol concen-tration values and voltage values
    Sample numberConcentration valueVoltage value/V
    175.0%0.767
    274.6%0.736
    373.7%0.703
    471.8%0.664
    570.0%0.630
    665.3%0.575
    760.6%0.524
    858.3%0.514
    946.0%0.429
    1035.3%0.371
    1128.8%0.340
    1222.1%0.312
    1315.7%0.291
    149.50%0.266
    157.00%0.259
    164.10%0.245
    170%0.237
    Table 1. Comparison table of different alcohol concen-tration values and corresponding voltage values
    Sample numberStandard valueMeasurementsAbsolute error
    175.2%74.6%0.6%
    272.7%71.8%0.9%
    371.4%70.3%1.1%
    464.7%64.2%0.5%
    553.5%52.9%0.6%
    642.5%43.1%0.6%
    739.5%39.7%0.2%
    835.3%35.7%0.4%
    926.1%26.9%0.8%
    1018.5%19.2%0.7%
    Table 2. Comparison of measured and standard values
    Sample numberRepeat the measurementContinuous measurements
    172.8%72.8%
    272.8%72.8%
    372.7%72.7%
    472.7%72.8%
    572.7%72.7%
    672.6%72.7%
    772.8%72.6%
    872.7%72.8%
    972.8%72.7%
    1072.8%72.6%
    Table 3. Repeat and continuous measurements at the same concentration
    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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