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Article

Design of an Integrated Near-Infrared Spectroscopy Module for Sugar Content Estimation of Apples

Division of Electronics and Electrical Engineering, Dongguk University, Seoul 04620, Korea
Academic Editor: Aiqun Liu
Micromachines 2022, 13(4), 519; https://doi.org/10.3390/mi13040519
Received: 28 February 2022 / Revised: 17 March 2022 / Accepted: 24 March 2022 / Published: 26 March 2022
(This article belongs to the Section E:Engineering and Technology)
An integrated near-infrared (NIR) spectroscopy prototype module for sugar content estimation of apples is presented. Since this is the first attempt to design an integrated NIR spectroscopy module, we followed the design process as follows. First, we estimated the sugar content of apples using a tungsten halogen light source and a 700 nm–1000 nm NIR spectrometer with a 10 nm wavelength resolution and a 16b analog-to-digital converter (ADC) resolution. Second, we determined the most effective wavelengths among 31 evenly distributed wavelengths while observing the correlation coefficient, R2, and then we reduced the ADC resolution 1b by 1b starting from 16b while also observing the R2. Lastly, we designed an integrated NIR spectroscopy module with the selected eight wavelengths and a 13 ADC resolution. The module implemented in a 0.18 μm 1P6M CMOS process occupies a die area of 0.84 mm2. By utilizing this module with eight off-chip light emitting diodes (LED) and one photo diode (PD), the measured R2 and the standard error of calibration (SEC) were 0.365 and 0.686 brix, respectively. View Full-Text
Keywords: NIR spectroscopy; sugar content estimation; CMOS integrated circuits NIR spectroscopy; sugar content estimation; CMOS integrated circuits
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MDPI and ACS Style

Byun, S. Design of an Integrated Near-Infrared Spectroscopy Module for Sugar Content Estimation of Apples. Micromachines 2022, 13, 519. https://doi.org/10.3390/mi13040519

AMA Style

Byun S. Design of an Integrated Near-Infrared Spectroscopy Module for Sugar Content Estimation of Apples. Micromachines. 2022; 13(4):519. https://doi.org/10.3390/mi13040519

Chicago/Turabian Style

Byun, Sangjin. 2022. "Design of an Integrated Near-Infrared Spectroscopy Module for Sugar Content Estimation of Apples" Micromachines 13, no. 4: 519. https://doi.org/10.3390/mi13040519

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