Vol. 6, Issue 4 (2017)

Author(s):
Rajni Kant, PK Prabhakar, S Samadder and PP Srivastav

Abstract:
Market demands for new sensors for food quality and safety stimulate the development of new sensing technologies that can provide an unobtrusive sensor form, battery-free operation, and minimal sensor cost. Intelligent labelling of food products to indicate and report their freshness and other conditions is one important possible application of such new sensors. RFID systems have been used in numerous applications like asset tracking, toll collection and libraries and capability to an adverse environment. The frequency of RFRD system can vary from the lower ranges of the spectrum 135 kHZ to SHF rang at 5.875 GHZ inductive coupling and back scatter modulation are use at lower frequencies as opposite to system operating at 2.45 GHZ RF system comprises of tag, reader and host interface. This system forms LCR circuit which is described by inductance, capacitance and resistance. Milk spoilage is a result of the growth of micro-organisms that modifies the composition of the medium with the metabolic products, changing the ionic content and conductivity of milk hence, determination of milk quality is critical to maintaining food safety and human health. RFID sensors should have the ability for self-calibration and self-correction for variable ambient conditions.