Method for manufacturing piezoelectric flexible sensor

Abstract

The invention belongs to the technical field of sensor manufacturing, and particularly relates to a method for manufacturing a piezoelectric flexible sensor. The method comprises the main process steps of 3D graph drawing, 3D printing, solution spraying, coating of a waterproof bottom layer, coating of silver colloid electrodes, 3D printing of a sensor, solidification of the sensor, temperature-controlled annealing, glue coating on the electrodes, waterproof packaging and electric polarization of the piezoelectric sensor, and the manufactured piezoelectric flexible sensor is adopted for beingcombined with an electromyographic signal pre-processing module, a Bluetooth wireless transmitting module, a Bluetooth wireless receiving module, an electromyographic signal analysis and processing module and a prosthesis movement control module to form a piezoelectric flexible sensing device; the device is scientific and reasonable in manufacturing process, good in product stability and long in service life; through the adoption of the built-in sensor, an electromyographic signal can be directly applied without involving the epidermal tissue and effectively and accurately collected to assistin controlling a prosthesis; meanwhile, by adopting liquid raw materials of PVDF-TrFE and PVDF-TrFE composite materials as 3D printing materials, the raw materials can be saved, and the method is environmentally friendly during application.

Description

Technical field: [0001] The invention belongs to the technical field of sensor production, in particular to a method for preparing a piezoelectric flexible sensor, using flexible piezoelectric material (polyvinylidene fluoride-trifluoroethylene) (PVDF-TrFE) and its composite material as the sensor material, adopting liquid Raw material slurry printing, the sensor is 3D printed into a shape that seamlessly fits the remaining limb muscles and adjacent tissues, and the muscle tension signal is collected. The sensor can work near the optimal working point in a free and tension-free state, with higher sensitivity. The stability and reliability of the working performance of the sensor is very beneficial. The piezoelectric signal sent by the brain to control the muscles of the original residual limb is amplified and filtered, and then wirelessly transmitted to the corresponding prosthetic part to control its movement, so that the prosthetic function is close to the original limb. Ba...

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Problems solved by technology

[0003] At present, most of the existing commercial 3D printing raw materials are powder or filament materials, and the waste of raw materials is serious. However, the price of P(VDF-TrFE) sold in the market is relatively high, so it is necessary to reduce the loss of preparation. Through the transformation of the printing head feeding method Using liquid raw materials as printing materials can save raw materials; (Titterington Don[US]; Wang Patricia[US]; WuBo[US] Inks comprising gallants for 3D printing.US20171564083020170703; French Xavier Boddaert research group reported inkjet printing in 2016 PVDF-TrFE sensor (Haque RI, Vie R, Germainy M, Valbin L, Benaben P, Boddaert X. Inkjet printing of high molecularweight PVDF-TrFE for flexible electronics. Flex Print Electron. 2016; 1(1): 12)), etc.

In terms of analyzing nerve signals, Wang Hong analyzed the whole brain wave to obtain residual limb control information (Human brain-manipulator interface system in micro-power wireless communication mode invented by Wang Hong, Li Chunsheng, Liu Chong, and Zhao Haibin in 2009[P] , the patent number is CN101569569;), but the signal components are complex and the accuracy is affected; we intend to use the signal of the clear residual limb nerve, drawing on the US patent of Hargrove et al. (Hargrove LJ, Simon AM, Young AJ, Lipschutz RD, Finucane SB, Smith DG, et al. Robotic leg control with EMG decoding in anamputee with nerve transfers. N Engl J Med. 2013; 369(13): 1237-42), found that body mo

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