A self-aligning ultrasound sensor for detecting foreign bodies in glass containers

B

“…The working principle and design of an ultrasonic transducer system with auto-alignment mechanism was first described by Zhao et al (102). The proposed system has been used for detecting foreign bodies in beverage containers.…”

Hybrid of multi-signal processing methods for detection of small objects in containers filled with beverages using ultrasound

“…Although in this study, water is used as a medium liquid, our previous work (Zhao et al, 2003b) indicates that this method is applicable to many beverages, such as orange and tomato juices. In fact many beverages have small impedance differences (o5%) from water, that makes it easier to transfer the results obtained from water to the beverages.…”

“…Fig. 1 is an example of this case where the echo signals were sampled from the outside of a glass bottle filled with water (Zhao, Basir, & Mittal, 2003a, 2003b. The first and the second pulses are respectively from the outer and the inner surfaces of the glass bottle.…”

Inspection of drinks cans using non-contact electromagnetic acoustic transducers

“…Consequently, it is desirable that all such contamination is detected and removed before the product reaches the consumer. A foreign body, which refers to any unwanted object in a food product (Zhao, Basir, & Mittal, 2003), is often introduced when food products are manufactured or packaged. Examples include metal or glass fragments, or other form of contaminants that have accidentally been introduced into the container either before or during filling.…”