“…Ultrasonic has been successfully been applied for freezing, cavitation, emulsification and thermosonication for many types of food products [5][6][7]. Several investigationson foreign body detection using ultrasonic sensor had been carried out as reported by Correia et al [8], Zhao et al [9], Pallav et al [10],Leemans and Destain [11], Tantray et al [12] and Polat et al [13], Mcclements [14],Hassler and Homayoon [15], Le Coz et al [16],Iuliano [17], Liu et al [18], Liaw et al [19], Makinde et al [20], Holmes et al [21], Melo et al [22], Khan et al [23], Prabhakar et al [24],Rodrigues et al [25], Franchini et al [26], Pandey [27], Aftab et al [28], Gounder and Tan [29], Sadaka et al [30], Fasina et al [31], Khan et al [32], Mitev et al [33], Roux et al [34], Nakib et al [35], Rathore [36], Singleton et al [37], Mahesh et al [38], Ezenwa [39], Natung [40] and Mustapha [41], In this paper, two common foreign bodies materials e.g. steel and rubber with different sizes were used to investigate the sensor voltage and voltage loss at the ultrasonic receiver.…”