Question

Determination of volume and percentage of sugar juice in sugarcane

Answer 1

The proposed resonator is shown in Figure 1. The microstrip line square ring resonator includes the feed lines, a closed conductor loop and coupling gaps. The resonator is one guide wavelength long which is designed for fundamental frequency of 1 GHz. The proposed sen-sor has been fabricated on a FR4 substrate (εr=4.6) with the dielectric thickness of 0.762 mm. The design param-eters used are strip width is 1.6 mm, feed length is 40mm and the coupling gaps are 0.35 mm and resonator length is 170mm. Each side of the square resonator is 4.25cm.Resonator length is found out by the equations (1) and (2)The coupling gaps have an influence to the resonance frequencies of the ring resonator structure. Normally cou-pling between the feed lines and the ring resonator are tried to implement with loose coupling. The loose coupling produces negligible effects to the resonance frequencies. Suitable length for the coupling gaps has to be chosen by using prototypes or modern electromagnetic simulation tools. The effects of the different lengths of coupling gaps are minor to determined values of dielectric constant and dissipation factor, if the coupling is implemented loose.3. Measurement SetupThe measurement setup is shown in the Figure 2. The experimental setup consists of the resonator, liquid sam-ple and Vector Network Analyzer (VNA). The VNA is used to measure the transmission parameter of the sen-sor with and without the sample in the frequency range between 0.91 GHz to 3 GHz. The calibration procedure is performed to establish a 50 ohm impedance between the sensor and the coaxial cable.A sample of cane juice is taken in a beaker and placed over the sensor. The fre-quency response of the reflected signal is displayed in the network analyzer. The shift in the resonant frequency for different concentration of sucrose is recorded by connect-ing the sensor with a vector network analyzer. geff0(1)effrrhwwh12121120041122.