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

Zhao, Bosen; Basir, Otman; Mittal, G.S.

doi:10.1016/j.lwt.2006.03.012

Cited by 4 publications

(1 citation statement)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These authors showed that the relative attenuation could be used to detect the objects and that absolute values are needed to recognize the differences between internal disorder and foreign bodies. Zhao et al (2007) used backscattered signals for detecting foreign bodies adhering to the inner walls of a bottle but this problem is in essence different, since time gating (measuring and comparing the time of flight of different signals) was not usable, which is not the case for the technique presented in this paper.…”

Section: Introductionmentioning

confidence: 99%

Ultrasonic internal defect detection in cheese

Leemans

Destain

2009

Journal of Food Engineering

View full text Add to dashboard Cite

Different ultrasonic signals and detection techniques were used and compared to detect internal foreign bodies present in semi-soft cheeses. The signals were a pulse or a chirp and the detection was carried out by using either correlation with a reference signal or a wavelet decomposition. The principle of the detection consisted in measuring the time of flight of the transmitted signals and of the echoes, the latter in the absence of foreign body should be the double of the former. The presence of a foreign object affected this pattern in several ways. In order to assess the method, a small plastic cylindrical object of 3 mm in diameter was introduced in one half of the cheese and was tested for detection, the second half being used as reference for the control cheese. The results showed that the two signals and the two detection methods were able to localise the transmitted signals and the echo from the opposite face of the cheese under all circumstances. For the foreign body detection, the correlation method gave superior results, in term of signal to noise ratio as well as in term of error rate, while the two signals gave similar results. The analysis of the mean and standard deviation of the signal to noise ratio of the object echo showed that some samples presented peak values close to those due to the noise. Nevertheless, the object was detected in 90% of the tests. There was no significant effect of temperature on the detection technique.

show abstract

Section: Introductionmentioning

confidence: 99%