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Detection of Low-Density Foreign Objects in Infant Snacks Using a Continuous-Wave Sub-Terahertz Imaging System for
Byeong-Hyeon Na1, Dae-Ho Lee1, Jaein Choe1
1School of Food Science and Biotechnology, Kyungpook National University, Daegu 41566, Republic of Korea.
Sensors (Basel, Switzerland)
|November 27, 2024
Summary
A new sub-terahertz (THz) imaging system effectively detects low-density foreign objects (LDFOs) in infant snacks. This advanced technology enhances food safety by identifying contaminants missed by traditional methods.
Area of Science:
- Food Science and Technology
- Sensor Technology
- Consumer Safety
Background:
- Low-density foreign objects (LDFOs) present significant food safety risks.
- Existing detection methods like metal and X-ray detectors are insufficient for low-density, nonmetallic contaminants.
Purpose of the Study:
- To develop and optimize a continuous-wave sub-terahertz (THz) imaging system for real-time, on-site detection of LDFOs in infant snacks.
- To evaluate the system's performance under various conditions and with different food types.
Main Methods:
- Optimized a sub-terahertz (THz) imaging system by adjusting attenuation (0-9 dB) and image processing parameters (White, Black, Gamma: 0-100).
- Evaluated detectability of eight LDFOs beneath infant snacks at a scanning speed of 30 cm/s.
- Measured snack moisture content using a modified AOAC-based drying method at 105 °C.
Main Results:
- Optimal settings varied by snack type: 3 dB attenuation with specific image parameters for puffed snacks and freeze-dried chips, and 0 dB for others.
- Successfully detected common contaminants like houseflies and cockroaches.
- Detected LDFOs as small as 3 mm in single-layer snacks and up to 7.5 mm in two-layer snacks, including various plastics and elastomers.
Conclusions:
- The optimized sub-terahertz (THz) imaging system provides rapid and effective detection of LDFOs in infant snacks.
- This technology offers a promising advancement for enhancing safety and quality control in the food industry.
