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An ultrasonic transducer for sensing liquid within an article, such as a vassel or pipe, without contacting the liquid has a body, a sealed capsule of a flexible material containing a liquid capable of transmitting ultrasonic energy carried by the body from which a head portion of the capsule extend

An ultrasonic transducer for sensing liquid within an article, such as a vassel or pipe, without contacting the liquid has a body, a sealed capsule of a flexible material containing a liquid capable of transmitting ultrasonic energy carried by the body from which a head portion of the capsule extends to contact a wall of the article. Within the body is a piezo-electric element in contact with a portion of the sealed capsule to transmit ultrasonic energy to and receive energy from the liquid in said capsule as it passes through the capsule head without the need for a coupling compound.

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1. An ultrasonic transducer for sensing liquid within an article without contacting the liquid comprising:a body having a bore;a sealed capsule containing a fluid capable of transmitting ultrasonic energy carried by said body and having a portion with a blind bore located within said body bore and a

1. An ultrasonic transducer for sensing liquid within an article without contacting the liquid comprising:a body having a bore;a sealed capsule containing a fluid capable of transmitting ultrasonic energy carried by said body and having a portion with a blind bore located within said body bore and a deformable head portion extending outwardly of said body to contact the article; andan internal housing within said capsule blind bore carrying a piezo-electric element in contact with a portion of said sealed capsule to transmit ultrasonic energy to and receive energy from said fluid in said capsule. 2. An ultrasonic transducer as in claim 1 wherein said capsule head portion is both deformable and flexible. 3. An ultrasonic traducer as in claim 1 wherein said entire capsule is of a flexible material. 4. An ultrasonic transducer as in claim 1 wherein said transmission fluid is oil. 5. An ultrasonic transducer as in claim 1 wherein said internal housing is of metal. 6. An ultrasonic transducer for sensing liquid within an article without contacting the liquid comprising:a body;a sealed capsule containing a liquid capable of transmission of ultrasonic energy carried by said body, said capsule having a head portion that is deformable extending therefrom to contact the article and being formed with a blind bore;an internal housing containing a piezo-electric element within said capsule blind bore, said piezo-electric element being in contact with a portion of said sealed capsule to transmit ultrasonic energy to and receive energy from the liquid in said capsule; anda flexible material filling said body bore to hold said capsule. 7. An ultrasonic transducer as in claim 4 wherein said piezo-electric element has an operating frequency in the range of from about 250 KHz to about 5 MHz. 8. An ultrasonic transducer as in claim 3 wherein the material of said capsule is of one of rubber and plastic. 9. An ultrasonic transducer as in claim 1 and further comprising a flexible material filling said body bore to hold said internal housing and said portion of said capsule that is within body bore to said body. 10. An ultrasonic transducer as in claim 1 wherein said capsule is of a deformable material that fits over and surrounds a portion of said internal housing. 11. An ultrasonic transducer as in claim 10 and further comprising a material filling said body bore to hold said internal housing and said portion of said capsule that is within body bore to said body. 12. An ultrasonic transducer as in claim 11 wherein said material filling said body bore is flexible.