Capacitive sensor for detecting plant leaf water content and measuring device formed by sensors

Abstract

The invention discloses a capacitive sensor for detecting a plant leaf water content. The sensor comprises a light measuring clamp, two substrates and two parallel plate electrodes, wherein the lightmeasuring clamp comprises an upper clamp body and a lower clamp body, the two substrates are fixed to the upper clamp body and the lower clamp body of the light measuring clamp, the two parallel plateelectrodes are respectively fixed to the two substrates, the substrates are insulator thin plates, and the parallel plate electrodes are conductive foam. The parallel plate electrodes in the capacitive sensor disclosed by the invention can well transmit clamping force of a plastic clamp to a leaf, the leaf can be attached to the parallel plate electrodes, and the leaf is not prone to being damaged. A measuring device disclosed by the invention is composed of a plurality of the capacitive sensors which are in parallel connection; thus, the clamping size of one single sensor can be reduced, leaf veins are prevented from being clamped, measuring errors are reduced, and leaf water content measuring accuracy is improved.

Description

technical field [0001] The invention belongs to the field of measuring devices for the water content of plant leaves, in particular to a capacitance sensor for detecting the water content of plant leaves and a measuring device composed of the sensor. Background technique [0002] Water deficit in plants will lead to the disorder of physiological activities, so it is of great significance to quickly, accurately and non-destructively diagnose plants. Plant leaves are important organs for physiological processes such as photosynthesis, respiration, and transpiration. The water content of leaves can truly reflect the water content and drought information of plants. The rapid, accurate and non-destructive detection of water content in plant leaves is very important for the study of plant physiology. It is of great significance to guide drought resistance. [0003] At present, the water content detection process of plant leaves mainly includes two categories: direct measurement a...

AI Technical Summary

Problems solved by technology

However, the capacitance value of plant leaves is not only affected by the water content of plant leaves, but the pressure of the electrode plate on the plant leaves also significantly affects the measured capacitance value. Under the same pressure, the detection accuracy will be reduced due to the different thickness of the leaf veins in the measurement range of the electrode plate.

However, the existing instruments do not consider the influence of the thickness of the leaf veins on the detection results, which makes the detection accuracy not high

If a copper sheet is used as a parallel plate electrode, due to the rigidity of the copper sheet, the copper sheet is blocked by the veins under low pressure and cannot effectively transfer all the pressure to the electrode plate to cover all areas. When the pressure is high, the leaf veins will be injured. Both situations will affect measurement accuracy

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