Raindrop impact kinetic energy testing system based on multipoint PVDF piezoelectric thin-film sensor

Abstract

The invention discloses a raindrop impact kinetic energy testing system based on a multipoint PVDF piezoelectric thin-film sensor. The testing system is composed of a PVDF piezoelectric thin film, an insulating thin-film substrate, a copper grid line, a lead, a signal amplifying circuit and a signal acquisition circuit. The piezoelectric thin film is located on the upper part of the insulating thin-film substrate; the copper grid line is photoetched on the insulating thin-film substrate; the lead is connected to the upper and lower surfaces of the grid line, and the upper surface serves as a signal leading-out end, while the lower surface is grounded; the signal leading-out end is connected with the input end of the amplifying circuit; the output end of the amplifying circuit is connected with the signal acquisition circuit. The raindrop impact kinetic energy testing system which is quick and accurate, convenient to operate and simple in structure is designed by utilizing a novel high polymer material PVDF piezoelectric thin film; the raindrop impact kinetic energy testing system is capable of obtaining the raindrop impact kinetic energy quickly and conveniently, capable of realizing multipoint real-time measurement and the raindrop impact strength testing within a certain range, and also capable of eliminating single-point test errors; as a result, the impact force of a mobile spray irrigation apparatus in the agricultural field can be possibly tested.

Description

technical field [0001] The invention belongs to a raindrop impact kinetic energy test device, in particular to a raindrop impact kinetic energy test system based on a multi-point PVDF piezoelectric film sensor, which is suitable for measuring the impact force and impact kinetic energy of raindrops generated by sprinkler irrigation equipment on the ground, plant surfaces and inside. Background technique [0002] The splashing effect of raindrops is the main driving force of bare soil erosion. The impact kinetic energy of raindrops has a great influence on the permeability of calcium, magnesium, sodium calcium and sodium magnesium in soil. When the impact kinetic energy of raindrops increases, the degree of soil compaction also increases correspondingly. , and the impact force of raindrops on young leaves will directly affect the yield and quality of crops. Therefore, the impact force and kinetic energy of raindrops are one of the important factors affecting the selection of sp...

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Problems solved by technology

[0004] The new polymer material PVDF piezoelectric film has very good performance, its variable force response sensitivity is 10 times higher than that of quartz crystal, and the piezoelectric voltage output constant g=174 is the highest among all piezoelectric bodies; its mechanical quality factor is low, and its damping Small, low density, with broadband characteristics, can meet the frequency characteristics of the pulse signal, due to the flexibility of the PVdF membrane and the high resonant frequency of the stretching vibration in the thickness direction, it has a flat frequency response in a wide range (the response range is 0.1 -100MHz), the frequency of single raindrop impact kinetic energy is very low, about 0.5 ~ 4Hz, therefore, in theory, PVDF piezoelectric film is an ideal material for the test of raindrop impact kinetic energy, but piezoelectric film is in the field of agriculture There are very few applications, so it is necessary to design and develop a raindrop impact force and impact energy measurement system based on PVDF piezoelectric film in agriculture

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