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FIELD OF THE INVENTION The present invention relates to a high pressure hydrophone device
comprising at least one piezoelectric hydrophone. (Prior Art) Hydrophones, which should be
operated at high depths and under high pressure, affect the operating characteristics in the
wrong direction and, for example, simply the ringing of the housing of the hearing aid is the
whole of the device Exposed to conditions that can lead to failure. The pneumatically pressurized
hearing aid housing starts to leak under high pressure, eg several hundred kp / 0 m 2, and
hydrophones filled with various fluids that can withstand high atmospheric pressure are poorly
acoustically responsive It turns out that. The asymmetrical shape of the hearing aid also degrades
the operating characteristics. Therefore, in order to overcome the above-mentioned drawbacks,
spherical hydrophones have been developed, in which the piezoelectric elements together form a
spheroid, ie a spherical shell coated on the inner and outer surfaces with a metallic conductor.
The The inner and outer metallic conductor surfaces are connected to electrical wires and the
piezoelectric membrane is radially polarized. A hearing aid configured as a spherical shell is
disclosed, for example, in U.S. Pat. Nos. 3,221,296 and 3,805,226. According to the last
mentioned patent publication, the hearing aid is also surrounded by a closed elastic case, the
inside of both the hearing aid and the case being filled with a viscous dielectric material, and the
inside and outside of the hearing aid There is an open connection between them so that the
atmospheric pressure can be equalized. However, hydrophones of the type described above are
significantly weakened in strength and complicated as they require retraction to provide an
electrical connection between the inner and outer surfaces of the shell. However, the
aforementioned electrical pull-in is a permanent source of problems when the hearing aid is to be
used in a high pressure environment, such as a downhole. The object of the present invention is
to eliminate the aforementioned and other drawbacks. The above object of the present invention
comprises at least one piezoelectric hydrophone, wherein said hearing aid is made of
piezoelectric material and joined together to form a liquid-tight closed shell. A hearing aid device
comprising an open shell which is symmetrical about at least two axes forming, the open shell
preferably having a radially opposite polarity and closed inside of the closed shell. Coating the
inside of the empty and closed shell with a conductive material, forming at least two inner
separate conductive areas electrically interconnected, and coating the outside of each general
with a conductive material, By forming the at least two outer, separate conductive regions and
radially aligning the inner and outer conductive regions in pairs, the inner and outer regions are
Each forms a capacitive electrode It is achieved by hydrophone and wherein the.
Further features and advantages of the hydrophone according to the invention are evident from
the claims. The invention can be better understood from the following description of an
embodiment with reference to the accompanying drawings. The same reference numbers in the
figures always denote the same elements. EXAMPLE FIG. 1 shows a spherical hydrophone
according to the invention. The spherical shell consists of two hemispherical bodies 1, 1 'made of
piezoelectric material. The piezoelectric material may be a pressure resistant ceramic material in
the form of lead zirconate titanate, preferably modified with cadmium or zinc, as is well known in
the art. For the operational and acoustical properties of spherical hydrophones made of said
material, see 1982 July-August 28 (4), Sov, Phys. Acoust, in a paper entitled Hollow spherical
piezoelectric elements operating at large static pressure, J ("Hollow five spherical piezoelectric
elements operating at large five tactile pressures"), the inner and outer surfaces of each
hemispherical body are silver coated 2 , 2 'and the coatings form conductive areas arranged in
radial alignment in pairs with one another. The inner conductive area 3, 3 'in each hemispherical
body is connected to the conductor 10, and the hemispherical body is joined to the spherical
shell, for example by means of an adhesive, so that an insulating adhesive joint 8 is formed. The
piezoelectric materials that make up each hemisphere are radially oppositely polarized, and
polarization is carried out as is well known in the processing of ceramic piezoelectric materials.
Conductor 5. Due to the potential difference between the dabs, the inner and outer conductive
regions in each hemisphere constitute capacitive electrodes, so that each hemisphere has an
electrical equivalent diagram as shown in FIG. 1b. Can be regarded as a bowl. Thus, there is no
need to pull into the conductor due to the capacitive connection between the inner and outer
conductive coatings in each hemispherical body, and thus a spherically symmetrical symmetry in
which the above mentioned drawbacks are completely eliminated. A hydrophone device is
obtained. In FIG. 2a, the hydrophone device shown in FIG. 1 has been expanded to include three
spherically symmetrical shells which are each joined to one another in the same manner as the
one shown in FIG. 1a. There is. Since the shells of each of the hydrophones are identical, only one
of the number of hydrophones connected in series is referenced. A diagram of the electrical
phase etc. for the hydrophone unit connected in series is shown in FIG. 2a and corresponds to
the series connection of the capacitors.
It is clear to the person skilled in the art that said connections are high in voltage sensitivity and
low in capacitance. In FIG. 3a, spherical hydrophones are connected in series and in parallel, the
electrical diagram etc. of which is shown in FIG. 3b. It can be seen that it corresponds to
capacitors connected in parallel, the potential difference being the same across each of the
spherical hydrophones. The capacitance is the sum of the capacitances of each spherical
hydrophone. In FIG. 4 another embodiment of the hydrophone according to the invention is
shown, in which the spherical symmetry is disclaimed, but with each end closed with a
hemispherical body to form a cylindrical shell. In some cases, the symmetry about the axis is
maintained. Furthermore, the hydrophone is constructed as in the previous embodiment. The
electrical equivalent diagram is shown in FIG. 4b and it can be seen that the hydrophone device
shown in FIG. 4a forms four series connected capacitors. In fact, said cylindrical membrane forms
two separate hydrophones, as the silver coating on its inside is divided by the air gap 11 into two
separate areas. FIG. 5 shows a spherically symmetrical embodiment of the hydrophone device
according to the invention, the spherical shell being surrounded by an acoustically transparent
material. The sound transmitting material may be a rubber material such as r Viton J. The
conductors 5, 5 'from the outer conductive coating 2' are connected respectively to the
solder bin Usually the cavity of the hydrophone is empty, but this is not a necessary
condition. If, for example, a hydrophone is used for the detection of various types of shockwaves,
the sensitivity is not particularly important, and in this respect the inside of the hydrophone may
be filled with a buffer. In addition, shells symmetrical about an axis, which is the basis of
hydrophones, may be joined by methods other than those disclosed herein, with the inner and
outer conductive coatings paired as the present specification. May be formulated in a manner
other than that disclosed in the In principle it is also possible to provide an electronic device
inside the hydrophone as desired.
Brief description of the drawings
FIG. 1a shows a basic embodiment of the hydrophone according to the invention, FIG. 1b is an
equivalent electrical diagram, and FIG. 2a the hydrophone shown in FIG. 1 is connected in three
side rows Fig. 2b is an electrical diagram corresponding to the hydrophone shown in Fig. 2a, Fig.
3a is a diagram in which the hydrophones shown in Fig. 1 are connected in parallel on three
sides, Fig. 3b is a diagram Fig. 4a is an electric diagram corresponding to the hydrophone shown
in Fig. 3a, Fig. 4a shows another embodiment of the hydrophone according to the present
invention, and Fig. 4b is an electric wire corresponding to the hydrophone shown in Fig. 4a. FIG.
5 and FIG. 5 are diagrams with the hydrophone shown in FIG. 1 sealed and equipped with an
external electrical connection.
In the figures: 1.1 '... hemispherical body 2.2' ... silver coating 3.3 '... inner conductive region 5.5'
... conductor 8 ... insulating junction 10 ... ·conductor.
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