Body waves recorded inside an elastic half-space by an embedded, wideband velocity sensor
نویسندگان
چکیده
This paper presents a unique embeddible acoustic emission sensor. Comparison with theoretically calculated waveforms for the embedded sensor, surface step force Lamb’s problem prove the sensor to be an accurate transducer of particle velocity, with sensitivity of 2.34 V output per mm/s. Calibration as a surface sensor by the National Institute of Standards and Technology ~NIST! show the sensor to be an accurate transducer of surface displacement with a sensitivity of 2.8 V/nm. The paper presents details about the design and construction of the sensor as well as calibration and verification. Unique design elements include the use of a lead-alloy backing masses, soft elastomer shear-spring isolation and mounting, and embedment. The sensor is based on the NIST conical lead zirconate-titanate ~PZT! element and has a finished length of 38 mm and a diameter of 16 mm. The sensor is robust enough to work under 1 MPa of brine pressure. © 1998 Acoustical Society of America. @S0001-4966~98!01409-X#
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