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Specification L Title of Invention
Electroacoustic transducer
a) Detailed Description of the Invention The present invention is directed to a probe for use in an
apparatus for generating or detecting ultrasonic waves in general, and in particular for obtaining
an electroacoustic transducer probe having good performance characteristics over a long time
even in a warm atmosphere. The present invention relates to a damper structure housed in a
probe. A probe for electroacoustic conversion used for nondestructive inspection equipment by
ultrasonic waves, thickness measurement equipment, etc. usually generates mechanical vibration
of the piezoelectric element by pulse voltage applied to the piezoelectric element to be inspected
as a sound wave It receives the echo transmitted to the object to be inspected and reflected by
the inspection object and has the function of converting the vibration of the piezoelectric element
into a voltage. A damper is attached to the piezoelectric element and the back surface to absorb
the vibration of the piezoelectric element Send and receive 9 disassembly plating. By the way, the
material of the damper is an epoxy resin mixed with tungsten powder having a large specific
gravity in consideration of the magnitude of the sound reduction constant and the matching of
the acoustic impedance of the piezoelectric element. Thermal degradation occurs at the above
temperature, the adhesion between the piezoelectric back face and the damper is impaired, the
damping effect to absorb the vibration wJ of the piezoelectric element is reduced, and the
resolution is significantly reduced during long time use at high temperature. The present
invention has been made to eliminate the above-mentioned drawbacks, and it is an object of the
present invention to provide an electroacoustic transducer probe which does not show a
reduction in resolution even in high temperature and long time use. A damper material suitable
for this purpose does not deteriorate at a high temperature EndPage: 1 迄 and has a large
ultrasonic attenuation ability, and a piezoelectric material based on a heat-resistant contact
medium without reducing the ultrasonic attenuation ability due to temperature. It is necessary
that the bonding with the end withstand the temperature change. It was found that a material
having large ultrasonic wave attenuation ability and little decrease in ultrasonic wave attenuation
ability due to temperature can be obtained by heating the ferrite stainless steel f1200 ° C. to
coarsen the crystal grains. However, the material is broken due to a temperature change because
the joint between the material and the heat-resistant contact medium with the piezoelectric
element such as lithium niobate has a large thermal expansion coefficient difference between the
material and the piezoelectric element. Therefore, by joining the bottom sK austenitic stainless
steel of ferritic stainless steel by gold brazing or welding, and making the opposing surface to the
piezoelectric element an austenitic stainless steel, it resists tm change and has high ultrasonic
attenuation ability at high temperature. I was able to get a big Dunha. That is, the present
invention is characterized in that, in the method of closely joining the facing surfaces of the
piezoelectric element and the damper by the operation of temperature rise and fall such as
brazing, the damper is constituted by joining ferritic stainless steel and austenitic stainless steel. .
Hereinafter, an embodiment of a probe according to the present invention will be described with
reference to the drawings. In the figure, (l) is a stainless steel case, for example, and ml of the
bottom of the case contains a piezoelectric element (2) such as lithium niobate through a contact
medium (8a) such as silver solder. Furthermore, the insulating cylinders (4a) and (4b) are housed
in the case + 11 as shown in the figure, and the damper (5a) is in contact with the piezoelectric
element (2) via the contact medium (8a) even if silver solder is used. To accommodate. The
damper (5a) is obtained by joining and integrating the austenitic stainless steel (5b) and the
ferritic stainless steel (5C) in advance by gold brazing or welding before being accommodated in
the case +11. Thus, the contents in the case (1) are inserted into a vacuum furnace together with
the case txt, heated to a temperature above the melting point of silver solder, and cooled to
complete silver brazing. After assembling in this way, connect one end of the core wire (7) of the
sheath wire (6) to the damper to (5a), and connect the other end of the power supply (not shown)
through the center hole of the cap (8) at the other end. Connect and seeds! Connect to the other
end of the power supply (not shown) of 161 outer pipe (9). The probe obtained in the above
embodiment has a cap of +81 screwed into the opening of the case (11 by screw αQ) and a
sheath wire (6) fixed to the cap (8) by welding or the like. It was able to withstand the
temperature change of and fully demonstrate its performance as a damper. It is needless to say
that the above embodiment is not limited to the structure shown in the figure, and various
modifications may be made.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view of a probe for
explaining the whole of one embodiment of the present invention. (1) · · · Case, (2) · · ·
Piezoelectric element (8a), (8b) · · · · Contact medium layer, (4a), (4b)-insulating cylinder, (5a),
(5b), ((5) 5c) Damper, (6), sheath wire, +71, sheath wire core, (8), cap, (9), sheath outer tube, Oo,
screw h (c) 51EndPage: 2
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jps5575646, description
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