Electrical impedance spectrum detection system and electrical impedance spectrum detection method for crops

Abstract

The invention discloses an electrical impedance spectrum detection system for crops. The system comprises an electrical impedance spectrum detection unit, an impedance analysis unit, a microcontrol unit and an upper computer, wherein the microcontrol unit is connected with the upper computer and is used for receiving working parameters, set by the upper computer, of the impedance analysis unit and transmitting the working parameters to the impedance analysis unit; the impedance analysis unit is used for generating a first unipolar sinusoidal signal according to the working parameters and outputting the first unipolar sinusoidal signal to the electrical impedance spectrum detection unit; the electrical impedance spectrum detection unit is used for converting the first unipolar sinusoidal signal into constant current and loading the constant current to the crops to acquire a voltage signal of the crops, and converting the voltage signal into a second unipolar sinusoidal signal and inputting the second unipolar sinusoidal signal to the impedance analysis unit; and the upper computer is used for processing the second unipolar sinusoidal signal acquired through the microcontrol unit and displaying an electrical impedance spectrogram of the crops. The invention also discloses an electrical impedance spectrum detection method for the crops. Through the system and the method of the invention, the living body crops can be detected without damaging electrical impedance spectra conveniently in the long term in a greenhouse.

Description

technical field [0001] The invention relates to the field of agricultural information technology, in particular to a crop electrical impedance spectrum detection system and method. Background technique [0002] There are usually two analysis methods of impedance technology: bio-impedance analysis (BIA) and bio-impedance spectrum analysis (BIS). The method of measuring the electrical impedance map of crop tissues and organs is called EIS method. Crop cells are composed of two parts, the cell wall and the protoplast. Protoplasts are composed of the living matter - protoplasm, with two main electrolytic inclusions: vacuoles and cytoplasm surrounded by vacuolar and protoplasmic membranes, respectively. The cytoplasm contains a large number of organelles surrounded by specialized membranes. The water-soluble solution inside the vacuole mainly contains inorganic ions and organic acids. Current passing through the cell membrane creates a potential difference that is maintained ...

AI Technical Summary

Problems solved by technology

[0011] (5) Another test by Zhang Libin et al. (2000) showed that in the frequency range of 5-100kHz, the impedance of rotten or damaged apples is smaller than that of intact apples, but the test results are greatly affected by frequency drift; in the frequency range of 33-100kHz In the frequency range, the relative permittivity of rotten or damaged apples is larger than that of intact apples, and the change of test frequency has basically no effect on the relative permittivity; the change of loss factor has no certain regularity

[0018] To sum up, the current methods for measuring crop electrical impedance spectrum are mostly lossy and short-term, and are not suitable for long-term monitoring of crop electrical impedance spectrum in greenhouses; most of the measuring instruments used are existing large-scale impedance spectra, It cannot be measured by a portable method in the greenhouse; and the relationship between the in vivo electrical impedance spectrum of crops and the change of water state should also be studied in depth

Images