Electromagnetic acoustic transducer for bolt tension and load measurement
First Claim
Patent Images
1. A device for measuring a load on a part, the device comprising:
- means for engaging the part, said engaging means having an interior space, the interior space of the engaging means being located between the engaging means and the part;
drive means for transmitting a load to the part through said engaging means, said drive means being detachably engagable with said engaging means;
a coil located in the interior space near the part for introducing an eddy current in the part;
means for providing current to said coin;
a magnet engaging the coil in the interior space and being attached to said drive means for providing a magnetic field, the magnet and the coil generating a noncontact ultrasonic signal in the part; and
detection means for detecting a change in the ultrasonic signal provided to the part.
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Abstract
A device for measuring a load on a part such as a bolt, comprises a socket having walls defining an interior space wherein the socket engages the bolt for transmitting a load to the bolt. An electromagnetic acoustic transducer comprising a magnet and a coil is located in the interior space of the socket near the bolt. The coil provides a current while the magnet provides a magnetic field such that the magnet and the coil generate an ultrasonic signal within the bolt. A detector is used to detect and measure a change in the ultrasonic signal at the bolt.
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Citations
12 Claims
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1. A device for measuring a load on a part, the device comprising:
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means for engaging the part, said engaging means having an interior space, the interior space of the engaging means being located between the engaging means and the part; drive means for transmitting a load to the part through said engaging means, said drive means being detachably engagable with said engaging means; a coil located in the interior space near the part for introducing an eddy current in the part; means for providing current to said coin; a magnet engaging the coil in the interior space and being attached to said drive means for providing a magnetic field, the magnet and the coil generating a noncontact ultrasonic signal in the part; and detection means for detecting a change in the ultrasonic signal provided to the part. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for measuring a load on a part, the method comprising the steps of:
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providing a means for engaging a part, the engaging means having walls defining an interior space; engaging the part such that the interior space is provided between the engaging means and the part; transmitting a load to the part with drive means through the engaging means, the drive means being detachably engagable with the engaging means; attaching a magnet with a coil to the drive means so that the magnet and coil are positioned in the interior space of the engaging means; generating a magnetic field in the interior space of the engaging means; providing a current in the interior space such that the current and the magnetic field produce a noncontact ultrasonic signal in the part; monitoring the ultrasonic signal in the part; and detecting a change in the ultrasonic signal. - View Dependent Claims (11, 12)
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Specification