Three-fiber based diffuse reflectance measurement technique for non-destructive measurement of sugar content in fruit and its verification by electronically tuned Ti:sapphire laser in the wavelength range 900-1070 nm

Using many samples of satsuma mandarins collected at random in packing houses, a method of establishing stable calibration equations to determine sugar content in the fruit by near infrared (NIR) transmittance spectroscopy was investigated. High accuracy in the determination of sugar content in the fruit could be obtained by multiple linear regression (MLR) using second derivative (D2) spectra in the 710–930 nm region. As a minimum, the four wavelengths mentioned below were needed as the predictor variables of the MLR equation. The D2 spectral change in the region of 900–910 nm was due to sugars (sucrose, glucose and fructose). A wavelength range of 880–890 nm and a wavelength range of 900–910 nm were selected as the best pair. A wavelength range of 740–755 nm region or 840–855 nm region compensated for the different optical pathlength of each fruit. One of the wavelengths around 794 nm or 835 nm was needed to compensate for the influence of fruit temperature. The influence of various factors such as fruit variety, growing location, harvest season and production year were investigated when the calibration was developed. When calibration samples had sufficient variation in fruit quality, it was possible to obtain a stable equation for all variations.

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Dielectric properties assessment of honey by using non-destructive dielectric spectroscopy

International Journal of Electrical and Computer Engineering (IJECE) ◽

10.11591/ijece.v12i1.pp189-200 ◽

2022 ◽

Vol 12 (1) ◽

pp. 189

Author(s):

Aslina Abu Bakar ◽

Muhammad Aiman Najmi bin Rodzali ◽

Rosfariza Radzali ◽

Azlina Idris ◽

Ahmad Rashidy Razali

Keyword(s):

Dielectric Constant ◽

Water Content ◽

Measurement Technique ◽

Water Concentration ◽

Dielectric Constants ◽

Effect Of Temperature ◽

Frequency Range ◽

Calibration Methods ◽

Destructive Measurement ◽

Non Destructive

<p>In this research the dielectric constant of three types of Malaysian honey has been investigated using a non-destructive measurement technique. The objective of this research is to assess the dielectric constant of the three types of honey in Malaysia using a non-destructive measurement technique known as an open-ended coaxial probe in the frequency range from 100 MHz to 10 GHz frequency. Analysis on the effect water concentration in honey on the dielectric constant and the effect of temperature on dielectric constant of honey has been conducted. The three types of honey that have been chosen to be investigated in this project are stingless bee honey, wild honey and commercial (organic) honey and together their water adulterated samples. For this research, the probe had been set up by setting a range of frequency from 100 MHz to 10 GHz and needs to be calibrated with three calibration methods namely open, short and reference water. From the result it was found that the higher the temperature of the honey and the higher percentage of water content in the honey, the dielectric constant is increased. The dielectric constants of all honeys decreased with increasing frequency in the measured frequency range and increased with increase percentage of water content and temperature.</p>

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