Piezoelectric film sensor with elliptical flexible substrate

A flexible substrate and piezoelectric film technology, applied in the field of sensors, can solve the problems of inconvenient production of sensor substrates, and achieve the effects of miniaturization and arraying, small size and high sensitivity

Active Publication Date: 2018-03-23
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] A large number of studies have shown that the sensitivity of PVDF piezoelectric sensors with curved substrates is higher than that of flat substrates; ZL201110433976.4 discloses that the sensitivity of PVDF piezoelectric sensors is higher when the substrate curvature is large, but the sensor substrate of this patent is only a single The semicircular

Method used

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  • Piezoelectric film sensor with elliptical flexible substrate
  • Piezoelectric film sensor with elliptical flexible substrate
  • Piezoelectric film sensor with elliptical flexible substrate

Examples

Experimental program
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Example Embodiment

[0037] Example 1: When the arc length L is fixed, for a semi-elliptical base, the value of a can be uniquely determined according to the value of b. According to the semi-ellipse arc length formula: L=πb+2(a-b); so the long axis can be obtained as:

[0038] If the length L of the PVDF piezoelectric film is 2π, 3π, 4π, and 5π respectively (unit: mm), the value ranges of the major axis a and the minor axis b of the semi-elliptical base under each arc length are shown in Table 1. When PVDF piezoelectric films with corresponding arc lengths are covered on substrates with different long and short axes, when the top of the sensor is subjected to 1N concentrated force, the open-circuit voltage of the sensor is as follows: figure 2shown. The leftmost end point of each curve is a plane base when b=0, the rightmost end point is a semicircle base when a=b, and the rest of the points are ellipses. Depend on figure 2 It can be seen that in each case of equal arc length, the sensitiv...

Example Embodiment

[0042] Example 2: The present invention produced three sizes of elliptical flexible substrate piezoelectric sensors. The long and short axis parameters are shown in Table 2. image 3 The positions of the three sensors on the corresponding curves are marked in . Three kinds of piezoelectric thin film sensors are used to measure the human body pulse. The piezoelectric thin film sensor 5 is connected to the charge amplifier 6 , and the charge amplifier 6 is connected to the oscilloscope 7 . The piezoelectric film sensor 5 is placed on the wrist of the human body, and the pulse force 4 of the human body is applied to the piezoelectric film sensor 5 , and finally a pulse wave pattern is obtained on the oscilloscope 7 . The human pulse measured by the three sensors recorded by the oscilloscope 7 is as follows: Figures 5 to 7 By comparing the graphs before and after filtering, it can be found that the waveforms measured by the three sensors are smooth and smooth, the amplitude is m...

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Abstract

The invention belongs to the technical field of sensors and provides a piezoelectric film sensor with an elliptical flexible substrate. The piezoelectric film sensor comprises a piezoelectric film, aflexible substrate and an insulating protective layer. The flexible substrate of the piezoelectric film sensor is semi-elliptic cylindrical curved structure. The piezoelectric film covers the flexiblesubstrate and is fixed through the insulating protective layer. According to the flexible substrate structure, sensors are divided into an equal-arc-length ellipse elliptic flexible substrate sensorand an equal-chord-length elliptical flexible substrate sensor. According to the piezoelectric film sensor, through simulating and calculating output voltage of piezoelectric film sensors with semi-elliptical flexible substrates of different size parameters under the same action force, and an optimal flexible substrate size is determined, which means that the output voltage is taken as a basis ofdetermining the sensor flexible substrate size. The piezoelectric film sensor has higher sensitivity, and the miniaturization and arraying of sensors are facilitated.

Description

technical field [0001] The invention belongs to the technical field of sensors, and relates to a polyvinylidene fluoride piezoelectric film sensor with an elliptical flexible substrate. Background technique [0002] Polyvinylidene fluoride (PVDF) piezoelectric film is a new type of high-strength polymer, which can induce electric charge when it is deformed by tension and compression, and has excellent piezoelectric properties; PVDF piezoelectric film is soft, and the common thickness is 20 μm to 200 μm Within the range, it can be made into any shape according to the needs, and is suitable for large-scale array sensors; the acoustic impedance coefficient is low, close to pure water and human muscles, and it fits well with the human body, which is very suitable for monitoring human physiological signals sensor. PVDF piezoelectric film sensors have been widely used in industrial automation, instrumentation, medical electronics, electroacoustics, underwater acoustics, structura...

Claims

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Application Information

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IPC IPC(8): G01D5/12
CPCG01D5/12
Inventor 董维杰赵昕白凤仙
Owner DALIAN UNIV OF TECH
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