Matching region for damped piezoelectric ultrasonic apparatus
First Claim
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1. In an apparatus wherein ultrasonic energy is communicated between an ultrasonic transducer and a transmission medium, the improvement comprising:
- a matching region disposed between a surface of said transducer and said medium, said matching region including a layer having a multiplicity of tapered elements, each of said elements tapering down in size in the direction away from said transducer and toward said medium;
a damping material; and
another matching region disposed between an opposing surface of said transducer and said damping material, said another matching region including another layer having a multiplicity of tapered elements, each of said elements of said another layer tapering down in size away from said transducer.
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Abstract
An acoustic impedance match between an ultrasonic transducer and an adjacent transmission medium is obtained, with performance over a relatively wide bandwidth, by providing a special matching region between the transducer and the transmission medium. The matching region includes a layer having a multiplicity of tapered elements. Each of the elements tapers down in size in the direction away from the transducer.
141 Citations
48 Claims
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1. In an apparatus wherein ultrasonic energy is communicated between an ultrasonic transducer and a transmission medium, the improvement comprising:
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a matching region disposed between a surface of said transducer and said medium, said matching region including a layer having a multiplicity of tapered elements, each of said elements tapering down in size in the direction away from said transducer and toward said medium; a damping material; and another matching region disposed between an opposing surface of said transducer and said damping material, said another matching region including another layer having a multiplicity of tapered elements, each of said elements of said another layer tapering down in size away from said transducer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. Apparatus for investigating a body to determine characteristics thereof, comprising:
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means for generating energizing signals; an ultrasonic transducer coupled to said energizing means for generating a beam of ultrasonic energy for transmission into said body, receiving ultrasound energy reflected from the body, and converting the received ultrasound energy to electrical signals; means for processing said electrical signals to produce representations of the body characteristics; a transmission medium between said transducer and said body; and a matching region disposed between a surface of said transducer and said medium, said matching region including a layer having a multiplicity of tapered elements, each of said elements tapering down in size in the direction away from said transducer and toward said medium; a damping material; and another matching region disposed between an opposing surface of said transducer and said damping material, said another matching region including another layer having a multiplicity of tapered elements, each of said elements of said another layer tapering down in size away from said transducer. - View Dependent Claims (27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42)
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43. In an apparatus wherein ultrasonic energy is to be communicated between an ultrasonic transducer and a transmission medium adjacent to one surface of said transducer, the improvement comprising:
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a damping material located adjacent the opposing surface of said transducer; a matching region disposed between said opposing surface of said transducer and said damping material, said matching region including a layer having a multiplicity of tapered elements, each of said elements tapering down in size in the direction away from said transducer and toward said damping material. - View Dependent Claims (44, 45, 46, 47, 48)
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Specification