Research On The Fast Detection Method Of Pork Meat Moisture Content Based On The Electromagnetic Spectrum

Moisture content is an important meat quality trait.The fast and low-cost detection for the moisture content of meat or meat products are continuously concerned by researchers.The aim of this paper is to study the fast detection method of pork moisture content by using electromagnetic wave of different bands.In this study,two different bands are selected to study the theory and method,and the appropriate research scheme is designed to detect the moisture content of pork.One band is visible and near infrared spectra and the other is radio frequency electromagnetic wave.The moisture content of intact pork meat was determined employing near-infrared nondestructive reflectance spectroscopy.In the study,we simulated the light transmission process in biological tissue using the Monte Carlo method,analyzed the photon migration patterns in biological tissue,and designed the experiment to verify the penetration depth of photon in the experiment.Wavelengths in the range from 600 to 1100 nm,two spectra collection methods and three corresponding data processing methods were considered.Spectra were collected using a conventional Y-shaped optical fibre probe and an optical probe for steady-state spatially resolved detection.Models were established using data obtained with the steady-state spatially resolved probe(41 samples)and the Y-shaped optical probe(28 samples).Using the three-wavelength and Partial-least-squares regression(PLSR)calibration methods,the Y-shaped probe provided models with R2 values of 0.0097 and 0.36 respectively,whereas the steady-state spatially resolved probe provided models with R2 values of 0.3692 and 0.7769 respectively.Applying a successive-projection algorithm combined with multiple linear regressions to the data of the steady-state spatially resolved probe,the R2 of the obtained model was 0.8064.The effects of various factors,namely the shape of the probe,the contact between the probe and sample and the modelling method,were also evaluated.In the experiments,we can obtain the spectral information from the depth approximately 3 mm-4 mm or 4 mm-5 mm when the separation of the detector and the source is 6 mm or 9 mm,respectively.Near-infrared steady-state spatially resolved spectroscopy is thus an effective technique for predicting the moisture content of intact pork.At radio frequencies,the dielectric properties of meat are strongly affected by its moisture content.Therefore,we proposed a fast detection method for moisture content of pork by using quarter-wavelength transmission line at 150 MHz and designed a set of devices which contains a radio frequency measurement circuit and a detection sensor based on the fringing field effect.In this study,we designed three kinds of detection sensors,and simulated the electric field distribution around the probe.To verify the performance of the designed device,relevant calibrations and tests were conducted.The measurement results of moisture content obtained by our device and the network analyzer at 150 MHz were compared.The results indicate that our device can distinguish the change of moisture content between 72%and 80%in the minced meat.This method has considerable potential for rapid determination of meat moisture content,providing a foundation for extending its application to non-destructive detection on the pork meat.