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Piezoelectric film type underwater explosion pressure sensor and measuring method thereof

A technology of pressure sensor and piezoelectric film, which is applied in the direction of fluid pressure measurement and blasting force measurement using piezoelectric devices, to achieve the effects of large pressure measurement range, expanding application range, and eliminating measurement errors

Inactive Publication Date: 2014-03-26
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the prior art, there is no report of using PVDF piezoelectric film to make a similar underwater explosion pressure sensor technology.

Method used

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  • Piezoelectric film type underwater explosion pressure sensor and measuring method thereof
  • Piezoelectric film type underwater explosion pressure sensor and measuring method thereof
  • Piezoelectric film type underwater explosion pressure sensor and measuring method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1 makes piezoelectric film pressure sensor

[0022] To make a sandwich piezoelectric film (PVDF) manometer: eg figure 1 As shown, first cut the 50 μm thick PVDF piezoelectric film 1 into a regular rectangular shape of 6mm×3mm; side; then seal it with an insulating film 3 with a thickness of 50 μm, and use epoxy resin as an adhesive to stick it firmly; The 3mm coaxial cable is transferred to the electrode lead, and the welding point is sealed with epoxy resin, and a sandwich piezoelectric film (PVDF) pressure gauge is obtained.

[0023] Make a piezoelectric film type pressure sensor: such as figure 2 As shown, the prepared sandwich PVDF pressure gauge 7 is soaked in the nylon hose 5 filled with silicone oil 8. The outer diameter of the nylon tube is 14mm, the inner diameter is 11mm, and the length is about 20cm; the upper and lower ends of the nylon tube are made of nylon plugs 4 and 9 Sealing, nylon plug diameter 10mm, length 6cm, sealing length 4cm. The...

Embodiment 2

[0025] Embodiment 2 carries out measuring test to the finished product of embodiment 1

[0026] When in use, the sensor is bound with adhesive tape on a thin wire suspended with a counterweight, and the mass of the counterweight is 1Kg. During the test, the device and circuit diagram are as follows image 3 As shown, the piezoelectric sensor 12 is connected in parallel with the resistor 13, and an oscilloscope 14 is used to record the voltage change at both ends of the resistor. In the figure, 15 is the explosive charge package, and 16 is the sensor suspension counterweight. During the test, the piezoelectric element and the test charge package are kept at the same level, and the piezoelectric film does not need to face the explosion source.

[0027] The experiment was carried out in an explosive water tower with a height of 5 meters and a diameter of 5 meters. The drug column is 10g passivated RDX, the size is Φ2cm×2cm, and the charge density is 1.6g / cm 3 , using nonel det...

Embodiment 3

[0030] The PVDF type underwater explosion pressure sensor and the tourmaline type sensor performance of embodiment 3 comparison making

[0031] The experimental device is the same as in Example 2, the drug pack is 10g RDX, the size is Φ2cm×2cm, and the charge density is 1.6g / cm 3 .

[0032]At the same time, the pressure time history curve at 70cm was tested by using the ICP type 138A05 underwater pressure sensor produced by PCB to compare the performance of the two sensors. 138A05 underwater pressure sensor is a tourmaline-type sensor specially used for testing underwater explosion shock waves. It has good repeatability and stability in testing underwater explosion pressure. A large number of experiments show that the test peak pressure and theoretical calculation pressure error Within 5%. The distance between the drug pack and the two sensors is 70 cm. It is found that the waveforms measured by the piezoelectric film sensor and the tourmaline sensor at the same position are...

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Abstract

The invention belongs to the field of underwater explosion measuring equipment, and particularly relates to a piezoelectric film type sensor used for underwater explosion pressure measurement and a measuring method thereof. According to the sensor, a sandwich type piezoelectric film pressure gage is placed in a hose filled with silicone oil, the two ends of the hose are sealed through plastic plugs, an extension leading wire is led out from a thin through hole of the upper plastic plug, and a flexible fine wire is wound on the outer wall face of the hose. The measuring method includes the steps that (1) the sensor is hung in the same horizontal line with an underwater explosion explosive cylinder through a counter weight, a resistor is connected to the sensor in parallel, a piezoelectric film and the resistor form a powered loop through an extension electrode leading wire, and an oscilloscope is arranged on the loop; (2) after explosives are ignited, voltage signals at the two ends of the resistor are recorded; (3) the quantity of electric charges of the piezoelectric film is obtained through calculation according to the voltage signals, and an explosive shock wave pressure numerical value is acquired through conversion. The piezoelectric film type sensor can be used for directly measuring the pressure change rate of underwater explosion, and is wide in pressure measuring range, convenient to process and low in cost.

Description

Technical field: [0001] The invention belongs to the field of underwater explosion measuring equipment, and also relates to the manufacture of a polymer piezoelectric sensor and its measuring method. Background technique: [0002] Underwater explosion pressure measurement has always been one of the important ways to study the detonation performance of energetic materials. At present, the sensitive elements used in underwater explosion pressure measurement sensors are mostly tourmaline, piezoelectric quartz and piezoelectric ceramics. When this type of crystal piezoelectric sensor is used for underwater explosion measurement, there is a gap between the sensitive element itself and the water. The problem of interwave impedance mismatch. In addition, for this kind of crystal-type piezoelectric sensitive element, when the measured pressure amplitude is high, the inside of the crystal will often be broken due to excessive pressure, that is, the test pressure range needs to be in...

Claims

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Application Information

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IPC IPC(8): G01L5/14G01L9/08
Inventor 马宏昊范志强沈兆武王德宝林谋金
Owner UNIV OF SCI & TECH OF CHINA
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