Foreign Body Detection in Foods Using the Ultrasound Pulse/Echo Method

Abstract

A "Foreign Body" (FB) is any undesirable piece of solid matter (metal, glass, stone, plastic)

Detection of Foreign Bodies in Foods Using Continuous Wave Terahertz Imaging

“…However, for on-line inspection, this technique must be acoustically coupled because of the large difference in acoustic impedance between transmitter and air (4 . 21,27). Other techniques have specific applications such as nut shell detection but are not satisfactory for detecting low-density FBs when buried inside food products and packaging (9).…”

“…Various techniques have been tested and commercially exploited for the detection of FBs, including magnetic field systems (metal detectors) (17), optical techniques (2,11), X-ray systems (9,22,28), electrostatic techniques (9), microwave imaging (3,5), near-infrared imaging (12,20), UV and fluorescence imaging (2,24), nuclear magnetic resonance (19), and ultrasonic imaging (4,8,21,27). Of these techniques, only magnetic systems (metal detectors), optical systems, and X rays have widespread use (3,7,9).…”

Ultrasonic detection of bone fragment in mechanically deboned chicken breasts

“…This suggests that amplitude ratio can be used to distinguish between uncut and cut samples, and between cut or uncut (only) samples and cut samples containing a bone fragment of any size used in this study. Zhao et al (2003) demonstrated that amplitude ratio was successfully used to detect foreign bodies in glass bottles containing liquid. In this study, the transducer detected a cut surface presumably because of the following reasons: i) the upper and the lower surfaces of the cut sample were not completely in contact, and ii) the cut surfaces may not have been perfectly horizontal resulting in reflection of ultrasonic waves away from the transducer.…”

Optimal Transducer Placement for Deep Learning-Based Non-Destructive Evaluation

“…In addition to detecting structural defects, the ultrasonic non-destructive testing methods also can be used to measure the thickness [ 5 , 6 , 7 ] or elasticity [ 8 ] of the material. Furthermore, ultrasonic flaw detection technique has been applied to food [ 9 ] and medical fields [ 10 , 11 , 12 ]. As described above, ultrasonic non-destructive inspection methods are capable of detecting defects on several structures and can be used for various purposes.…”