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The refractometric method uses a hand-held sugar-acidity meter and uses the principle of the ratio of refractive index of fruit juice to the concentration. This method, though simple, is also a lossy detection, and its detection accuracy is low. Visible light measurement utilizes a laboratory spectrometer to irradiate visible light onto a fruit surface, and a method of receiving transmitted light that has been absorbed by internal tissues on the opposite side of the irradiated portion. Although this method is a rapid loss detection, due to the low spectral information obtained, it is difficult to extract effective spectral information and affect its detection accuracy.
Near-infrared light measurement using a portable fruit detector uses a laboratory spectrometer to irradiate near-infrared light onto a fruit surface, and a method of reflecting light from the surface of the fruit after internal diffusion is measured. This method first performs spectral predifferentiation, smoothing, and other preprocessing, establishes a mathematical model in combination with chemometric methods, and uses the established model to predict the sugar acidity of the tested fruit. However, this method is based on laboratory spectroscopy instruments, which is costly and has no portability and ease of operation.
The fruit detection efficiency of the portable fruit detector
There are many methods for detecting fruit sugar acidity. The fruit samples are ground, crushed, and juices are extracted for measurement. This is obviously a loss detection method. This method is not only cumbersome to sample, time-consuming and laborious, but also has high detection cost and efficiency. low. In order to obtain a rapid and simple method for rapid detection of fruit sugar acidity, domestic and foreign scholars have conducted some related researches on HPLC analysis of fruit juice samples by high performance liquid chromatography. It takes a lot of time before analysis. Do complex sample pre-processing, this method is complex to operate, the instrument used is expensive, the detection cost is high, and the detection time is long. The portable fruit detector is very convenient for the detection of fruits, reducing the cumbersome process of research and obtaining more accurate data.