Multichannel electrical impedance type plant water content monitoring system

Abstract

The invention relates to a multichannel electrical impedance type plant water content monitoring system which comprises a hardware circuit, a measuring probe and a personal computer part. The multichannel electrical impedance type plant water content monitoring system is characterized in that the hardware circuit comprises a USB power supply module, a data transmission and control module and an impedance measuring module, wherein the USB power supply module supplies power to the hardware circuit after being connected with a personal computer; the data transmission and control module realizes channel gating switch control and data transmission; the impedance measuring module generates a frequency adjustable sinusoidal wave as an exciting source by a direct frequency synthesizing chip and obtains an impedance value by a self-balancing bridge circuit comprising an amplifier and a feedback resistor through analog multiplication and low-pass filtration, analogue-to-digital conversion and data processing; the measuring probe consists of a single-core shielded wire and a lamellar electrode; and the personal computer part is a control procedure interface, controls the hardware circuit andprocesses and displays measured data. The invention ensures simultaneous measure of multiple channels and has the advantages of non-invasive and long-term continuous monitoring, and the like.

Description

【Technical field】 [0001] The invention relates to a monitoring system, in particular to a multi-channel electrical impedance type plant water content monitoring system. 【Background technique】 [0002] Agricultural irrigation has a long history, and the technical issues related to irrigation have always been valued by people. my country's agricultural water consumption accounts for about 80% of the total annual water consumption, but the utilization rate of irrigation water is only 40%. On the one hand, water resources are in short supply, and on the other hand, water is wasting. The high-efficiency water-saving agriculture that is being implemented now includes reducing water loss (canal seepage prevention, pipeline water delivery), adopting advanced irrigation methods (spray irrigation, drip irrigation) and other agricultural water-saving measures (mulching with plastic film, selecting drought-resistant varieties), etc. When implementing irrigation, the key to high-yield a...

AI Technical Summary

Problems solved by technology

Some articles propose to measure the water content of plants indirectly by measuring the electrical impedance at both ends of plant stems. This method is not feasible for plants with large individual differences; there is also a patent "Plant Water Content Measuring Device" (ZL 200720103410.4) which uses a ring probe to measure the electrical impedance of plant stems. It is easy to carry, but it is powered by batteries and has only one measurement channel, which cannot realize long-term monitoring of different parts of plants or different plants, and the measurement method is invasive, which will damage the plant body

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