Title of Invention	"A TRANSDUCER DEVICE FOR USE IN HYDROPHONES"
Abstract	NA

Full Text

This invention relates to a transducer High sensitivity over the wide band of frequencies, is always the requirement of underwater listening devices. Such listening devices find their application in exploring the sea. The omnidirectional hydrophones are generally used for such purposes. The hydrophones capable of measurement of broad band, low noise omnidirectional signals are the basic need of today for exploration of sea under water level. The hydrophone comprises of two components: a transducer and a jacket to seal the transducer. Different systems in the form of discs, cylinders etc. do give very high sensitivity, but only over the narrow band of operating sensitivity. Transducers known in the prior art are generally longitudinal comprising of two circumferentially polarised cylindrical elements fitted one in another, a diphragm sealed in the cylinder, a metallised 0-ring. Such arrangement and construction of transducer is difficult to manufacture with high accuracy and as well as low cost. The connectioning of elements of such known transducers is highly complex problem. The other drawback of knwon transducers of the prior art is that, the joints of cylinders and diaphragm are made only through conducting adhesive. Such arrangements are not only inconvenient and difficult but also expensive. It is still another object of the present invention to provide an improved transducer device for use in hydrophone and comprising of simplest and convenient connection circuitory leading to no complexity. Still further an object of this invention is to provide a transducer device having no direct connection through wire passing from hole of the main body. According to this invention there is provided a transducer device of two radially polarised hemispheres and an intermediate feed through for connection of main cable to inner surface of both the hemispheres of the main body for use in hydrophones as an acoustic sensor to measure broad band low noise signals. Fig. 1 illustrates a vertical cross section of the transducer device. WE CLAIM: 1. A transducer device two radially polarised hemispheres and an intermediate feed through for connection of main cable to inner surface of both the hemispheres of the main body for use in hydrophones as an acoustic sensor to measure broad band low noise signals. 2. A transducer device as claimed in claim 1 wherein the said radialy polarised hemispheres are connected with each other through entire circumference with a non-conducting adhesive. 3. A transducer device as claimed in claims 1 and 2 wherein the said radially polarised hemispheres are provided with an hemispherical cut at only one end. 4. A transducer device as claimed in claims 1 to 3 wherein the said outer polarised surface is negatively charged and the said inner polarised surface of the said hemispheres are positively charged. 5. A transducer device as claimed in claims 1 to 4 wherein the said main cable is connected through the said feed through with the said positively charged inner surfaces of the said hemispheres. 6. A transducer device as claimed in claim 5 wherein the said main cable is soldered at said outer end of the said feed through. 7~ A transducer device as claimed in preceeding claims, wherein the said inner end of the said feed through is connected to said inner surfaces of the said hemispheres directly or indirectly. 8. A transducer device as claimed in claim 7, wherein the said direct contact of the said inner end of the said feed through with the said inner surface of the said hemispheres is made by two independent wires or with one common wire seperated into two wires. 9. , A transducer device as claimed in claim 8, wherein the said indirect contact of the said inner end of the said feed through with the said inner surface of the said hemispheres is made through said three wires, which in turn are soldered at one common point. 10. A transducer device as claimed in claims 5 - 9, wherein the said contact of the said wires on the said inner surfaces of the said hemispheres are made only at two points, one at each hemisphere. 11. A transducer device as claimed in preceeding claims, wherein the said wire is soldered at any two points of the negatively charged outer surfaces of the said hemispheres, preferably on the joining circumferences of both the hemispheres. 12. A transducer device as claimed in preceeding claims, wherein the said horizontal section of the said device is circular with constant radius, and the length of the said device is more than or equal to its diameter. 13. A transducer device as claimed in preceeding claims, wherein the said length of the said device is preferably less than twice

Documents:

2125-del-1996-claims.pdf

2125-del-1996-correspondence-others.pdf

2125-del-1996-correspondence-po.pdf

2125-del-1996-description (complete).pdf

2125-del-1996-drawings.pdf

2125-del-1996-form-1.pdf

2125-del-1996-form-19.pdf

2125-del-1996-form-2.pdf

2125-del-1996-form-3.pdf