Skoči na glavni sadržaj

Hrvatski časopis za prehrambenu tehnologiju, biotehnologiju i nutricionizam, Vol. 4 No. 1-2, 2009.

Stručni rad

Use of low-intensity ultrasound for foreign bodies determination in food systems

Mladen Brnčić ; Prehrambeno-biotehnološki fakultet Sveučilišta u Zagrebu, Zagreb, Hrvatska
Damir Markučič orcid id orcid.org/0000-0001-6310-1325 ; Fakultet strojarstva i brodogradnje, Sveučilište u Zagrebu, Zagreb, Hrvatska
Miroslav Omelić ; Fakultet strojarstva i brodogradnje, Sveučilište u Zagrebu, Zagreb, Hrvatska
Branko Tripalo ; Prehrambeno-biotehnološki fakultet Sveučilišta u Zagrebu, Zagreb, Hrvatska
Damir Ježek orcid id orcid.org/0000-0002-1952-8310 ; Prehrambeno-biotehnološki fakultet Sveučilišta u Zagrebu, Zagreb, Hrvatska

Puni tekst: hrvatski pdf 1.180 Kb

str. 18-22

preuzimanja: 959

citiraj

Sažetak

Ultrasound waves are mechanical vibrations in a solid or fluid with frequencies above 20 kHz. Ultrasound has been used in a many different technologies for a various industry applications and more and more in food industry, as an analytical tool, or for the raw material modification before, during and after the manufacturing of food products.
The use of ultrasound in food technology can be globally divided as low-intensity (< 1 Wcm-2), and hi-intensity (> 1 Wcm-2). Hi-intensity ultrasound is used to enhance, promote or change physical or chemical properties of foods. Low-intensity ultrasound is non-destructive method that enables data about physicochemical properties of food components and products such as structure, flow rate, thickness, composition, particle size and attendance of foreign bodies.
A “foreign body” is any unwanted piece of solid matter present in foodstuffs. It can be piece of wood, glass, rubber, stone, metal, plastic, fibre, dirt, nail or thin hair. Foreign bodies are significantly dissimilar from foodstuffs in terms of acoustic impedance and ultrasonic velocity, consequently a certain ultrasound response is to be registered.
Foreign bodies can be detected by registering the reflected, refracted or scattered acoustic signals. In practical applications for detection of
foreign bodies in foodstuffs frequency is usually above 50 kHz. In this work theoretical and practical approach for this technology is presented.

Ključne riječi

ultrasound; frequency; foreign bodies

Hrčak ID:

49938

URI

https://hrcak.srce.hr/49938

Datum izdavanja:

1.7.2009.

Podaci na drugim jezicima: hrvatski

Posjeta: 2.058 *