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Ultrasonic transmitter-receiver and ultrasonic flowmeter

An ultrasonic and receiver technology, applied in the field of ultrasonic flowmeter, can solve problems such as finding difficulties

Inactive Publication Date: 2005-02-09
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Finding such substances in solid materials is very difficult

Method used

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  • Ultrasonic transmitter-receiver and ultrasonic flowmeter
  • Ultrasonic transmitter-receiver and ultrasonic flowmeter
  • Ultrasonic transmitter-receiver and ultrasonic flowmeter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0157] figure 1 A cross-section of an ultrasonic transmitter-receiver (ultrasonic vibrator) in the first embodiment of the present invention is shown. The illustrated ultrasonic transmitter-receiver 1 has a piezoelectric body 4 , an acoustic matching layer 3 provided on the piezoelectric body 4 , and a protector 2 fixed to the piezoelectric body 4 .

[0158] The piezoelectric body 4 is made of a material having piezoelectric properties, and is polarized in the thickness direction. Electrodes (not shown) are provided on the upper and lower surfaces of the piezoelectric body 4 , and ultrasonic waves are emitted based on the voltage applied to the electrodes. Furthermore, when ultrasonic waves are received, a voltage signal is generated between the electrodes. In the present invention, the material of the piezoelectric body 4 is arbitrary, and known materials can also be used.

[0159] The height H of the protective portion 2 based on the main surface (ultrasonic transmitting...

no. 2 approach

[0197] refer to Figure 5 A second embodiment of the present invention will be described. In this embodiment, the protection part and the piezoelectric body are integrated. Specifically, a concave portion 5 a is formed in the central portion of the principal surface of the piezoelectric body 5 , and a part 5 b of the piezoelectric body 5 is used as a protection portion. In other words, a part 5b of the piezoelectric body 5 functions as a protecting portion, and the protecting portion is integrally formed with the piezoelectric body.

[0198] Figure 5 The ultrasonic transmitter receiver is made by the following method.

[0199] First, after preparing the piezoelectric body 5 subjected to the polarization treatment, one surface (principal surface) of the piezoelectric body 5 is processed to form the concave portion 5a. The processing for forming the concave portion 5a can be performed by an end mill or a sandblasting equipment. The depth of the recessed part 5a corresponds...

no. 3 approach

[0205] refer to Figure 8 A third embodiment of the present invention will be described.

[0206] The characteristic point of this embodiment is that it has the structural support body 6 . Figure 8 The shown support body 6 is provided with a disk-shaped support portion 6 a for fixing the acoustic matching layer 3 and the like, and a cylindrical portion 6 b extending continuously in the axial direction from the disk-shaped support portion. The end section of the cylindrical part is bent into an "L" shape so that it can be easily fixed on the board 60 for shielding and other devices.

[0207] On the surface of the support portion 6a of the structural support body 6, the acoustic matching layer 3 and the protection portion 2 are arranged, and the piezoelectric body 4 is arranged on the back surface of the support portion 6a. That is to say, the piezoelectric body 4 and the acoustic matching layer 3 are respectively provided at opposing positions sandwiching the structural suppor...

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PUM

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Abstract

An ultrasonic transducer according to the present invention includes: a piezoelectric body 4 to set up ultrasonic vibrations; an acoustic matching layer 3 made of a material with a density of 50kg / m3 to 1,000 kg / m3;and an acoustic impedance of 2.5x103kg / m2 / s to 1.0x106kg / m2 / s ; a lower acoustic matching layer 9 provided between the piezoelectric body 4 and the acoustic matching layer 3; and a structure supporting member 6 that supports the lower acoustic matching layer 9 and the piezoelectric body 4 thereon and shields the piezoelectric body 4 from a fluid that propagates the ultrasonic vibrations. The ultrasonic transducer includes a protective portion, which contacts with at least a portion of a side surface of the acoustic matching layer 4. This protective portion is defined by a portion of the lower acoustic matching layer 9 and forms an integral part of the lower acoustic matching layer 9.

Description

technical field [0001] The invention relates to an ultrasonic transmitter-receiver with an acoustic matching layer, a manufacturing method thereof, and an ultrasonic flowmeter provided with the ultrasonic transmitter-receiver. Background technique [0002] In recent years, ultrasonic flowmeters that measure the time for a predetermined distance in a pipe through which an ultrasonic transmission fluid flows, measure the moving velocity of the fluid, and determine the flow rate based on the flow velocity have been used in gas meters and the like. [0003] Figure 35 is a cross-sectional structure showing the main parts of this type of ultrasonic flowmeter. The ultrasonic flowmeter is arranged so that the fluid to be measured, whose flow rate should be measured, can flow in the tube. On the pipe wall 102, a pair of ultrasonic transmitter-receivers 101a and 101b are provided on opposite sides. The ultrasonic transmitter-receivers 101a and 101b are composed of piezoelectric vib...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01F1/66G10K11/02
CPCG01F1/662G10K11/02
Inventor 永原英知桥本雅彦铃木正明桥本和彦桥田卓白石诚吾高原范久
Owner PANASONIC CORP
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