Large power ultrasonic sensor

An ultrasonic and sensor technology, applied in the field of high-power ultrasonic sensors, can solve problems such as weak bonding between piezoelectric ceramic sheets and metal shells, attenuation of piezoelectric performance of piezoelectric ceramics, and no piezoelectric performance of piezoelectric ceramics, achieving continuous The effects of longer working hours, higher mechanical quality factors, and improved performance

Active Publication Date: 2015-04-01
广东思威特智能科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] First, due to the temperature characteristics of piezoelectric ceramics, when the temperature of the surrounding environment of piezoelectric ceramics is higher, the piezoelectric performance of piezoelectric ceramics will be attenuated more severely. When the temperature reaches the Curie temperature of piezoelectric ceramics, there will be degradation Polarization, resulting in piezoelectric ceramics without piezoelectric properties
[0006] Second, since the withstand temperature of the adhesive bonding the piezoelectric ceramic sheet and the metal casing is generally 80~100°C, it is easy to age the adhesive, resulting in weak bonding between the piezoelectric ceramic sheet and the metal casing, and even occurrence of Falling off and other phenomena also cause the sensor to fail to work
[0007] Third, the diameter of the existing ultrasonic sensor is small, and the emitted ultrasonic sound pressure value is small, which cannot play a good driving effect

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] like Figure 1 to Figure 2 As shown, a high-power ultrasonic sensor includes a metal cylinder 1, a piezoelectric ceramic sheet 2 and a circuit board 3; one end of the metal cylinder 1 is formed with a bottom plate 11, and the bottom plate 11 and the metal cylinder 1 are an integral structure, and the metal cylinder The other end of the body 1 is open; the circuit board 3 is assembled with the other end of the metal cylinder 1; the piezoelectric ceramic sheet 2 is electrically connected to the circuit board 3;

[0036] The raw material composition of the piezoelectric ceramic sheet is as follows:

[0037] Lead oxide with the formula Pb(Mn 1 / 3 Sb 2 / 3 )O 3 ] 0.045 -[PbTiO 3 ] 0.4716 -[PbZrO 3 ] 0.4834 ;

[0038] Nickel oxide, the molecular formula is NiO, its weight is 0.01% of lead oxide;

[0039] Cerium oxide, molecular formula CeO 2 , its weight is 0.02% of the oxide of lead;

[0040] Cobalt oxide, the molecular formula is CO 2 o3 , whose weight is 0.01% of...

Embodiment 2

[0046] like Figure 1 to Figure 2 As shown, a high-power ultrasonic sensor includes a metal cylinder 1, a piezoelectric ceramic sheet 2 and a circuit board 3; one end of the metal cylinder 1 is formed with a bottom plate 11, and the bottom plate 11 and the metal cylinder 1 are an integral structure, and the metal cylinder The other end of the body 1 is open; the circuit board 3 is assembled with the other end of the metal cylinder 1; the piezoelectric ceramic sheet 2 is electrically connected to the circuit board 3;

[0047] The raw material composition of the piezoelectric ceramic sheet is as follows:

[0048] Lead oxide with the formula Pb(Mn 1 / 3 Sb 2 / 3 )O 3 ] 0.045 -[PbTiO 3 ] 0.4716 -[PbZrO 3 ] 0.4834 ;

[0049] Nickel oxide, the molecular formula is NiO, its weight is 0.01% of lead oxide;

[0050] Cerium oxide, molecular formula CeO 2 , its weight is 0.02% of the oxide of lead;

[0051] Cobalt oxide, the molecular formula is CO 2 o 3 , whose weight is 0.01% ...

Embodiment 3

[0057] like Figure 1 to Figure 2 As shown, a high-power ultrasonic sensor includes a metal cylinder 1, a piezoelectric ceramic sheet 2 and a circuit board 3; one end of the metal cylinder 1 is formed with a bottom plate 11, and the bottom plate 11 and the metal cylinder 1 are an integral structure, and the metal cylinder The other end of the body 1 is open; the circuit board 3 is assembled with the other end of the metal cylinder 1; the piezoelectric ceramic sheet 2 is electrically connected to the circuit board 3;

[0058] The raw material composition of the piezoelectric ceramic sheet is as follows:

[0059] Lead oxide with the formula Pb(Mn 1 / 3 Sb 2 / 3 )O 3 ] 0.045 -[PbTiO 3 ] 0.4716 -[PbZrO 3 ] 0.4834 ;

[0060] Nickel oxide, the molecular formula is NiO, its weight is 0.01% of lead oxide;

[0061] Cerium oxide, molecular formula CeO 2 , its weight is 0.02% of the oxide of lead;

[0062] Cobalt oxide, the molecular formula is CO 2 o 3 , whose weight is 0.01% ...

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Abstract

The invention relates to a large power ultrasonic sensor and relates to the piezoelectric ceramic and ultrasonic sensor technology. The large power ultrasonic sensor comprises a metal cylinder body, a piezoelectric ceramic sheet and a circuit board. Raw materials of the piezoelectric ceramic sheet is further added with magnesium oxide, scandium oxide, ferric oxide and alumina, the piezoelectric ceramic sheet is bonded with the bottom board of the metal cylinder body through a high temperature resistance bonding agent, one face of the piezoelectric ceramic sheet is printed with one layer of high temperature resistance bonding agent through a screen, the diameter of the metal cylinder body is not smaller than 25mm. The property of the ceramic material turns hard, the piezoelectric ceramic sheet during operation generates heat which does not cause depolarization, the piezoelectric ceramic sheet is enabled to be more stable in the high temperature work environment, according to the large power ultrasonic sensor, performance is greatly improved, electromechanical coupling coefficient (KP) is not smaller than 60%, Tang loss is not greater than 0.5%, dielectric constant sigma is equal to 1700+ / -200, and a quality factor (QM) is equal to 1100+ / -200.

Description

technical field [0001] The invention relates to piezoelectric ceramics and ultrasonic sensor technology, in particular to a high-power ultrasonic sensor. Background technique [0002] Ultrasonic sensor is a sensor device developed by utilizing the piezoelectricity of piezoelectric ceramics. It has been widely used in industry, information industry, anti-theft alarm system, automatic door opening and closing device, car reversing sensor, remote control device of various electronic equipment, etc. When an electrical signal is applied to the piezoelectric ceramic sheet, it will deform, causing the vibrating surface of the sensor to emit ultrasonic waves. When the ultrasonic wave hits an obstacle, the ultrasonic wave is reflected back through the sensor and acts on the piezoelectric ceramic sheet. According to the inverse piezoelectric effect, the ultrasonic sensor generates an electrical signal output. Utilizing the principle that the propagation speed of ultrasonic waves in t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01H11/08C04B35/491G10K9/122
Inventor 杨洪严红光
Owner 广东思威特智能科技股份有限公司
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