(Vibration and Acceleration Sensing)
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A tilt sensor at rest experiences a constant gravitational acceleration G. When the sensor is tilted (rotated) by an angle ? from its starting position, it senses this tilt as the acceleration... (View Full Article)
(Tilt Sensing)
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Two important structures in Boston's Financial District in Dewey Square, with different structural foundation supports had similar concerns as a result of the Big Dig's 10-year cut-and-cover... (View Full Article)
(Tilt Sensing)
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Computation of Cross-Axis Tilts... (View Full Article)
(Vibration and Acceleration Sensing)
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Libby Dam is a straight axis concrete gravity dam on the Kootenai River approximately 17 miles upstream of Libby, Montana. The dam, constructed in 1961, is part of the Columbia Basin network of dams... (View Full Article)
(Tilt Sensing)
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Tilt sensors are calibrated by tilting them in a vertical plane and measuring their outputs at known angles. If a sensor is subsequently inclined by the cross-axis angle ß (Figure 1) and again rotated... (View Full Article)
(Tilt Sensing)
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It is sometimes necessary to measure tilt (rotation) in the presence of a strong magnetic field. Strong fields have no effect on the output of our electrolytic tilt sensors when the gradient between... (View Full Article)
(Tension Sensing)
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The FAA operates a state-of-the- art, full-scale pavement test facility dedicated solely to airport pavement research. Located at the William J. Hughes Technical Center near Atlantic City, New Jersey,... (View Full Article)
(Vibration and Acceleration Sensing)
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Jewell Instruments has recently began monitoring a critical gas pipeline in a notoriously active landslide zone. Using fiber-optics in conjunction with traditional vibrating wire equipment, the... (View Full Article)
(Tilt Sensing)
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The Alameda Corridor will streamline the freight rail connection from the ports of Los Angeles and Long Beach to an interstate rail hub near downtown Los Angeles. The 10-mile long midsection of the... (View Full Article)
(Tilt Sensing)
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Green Valley Road was built in Watsonville, California in the 1960s on a fill embankment placed over sands and clays of the Pleistocene Aromas Formation. The original ground surface sloped to the... (View Full Article)
(Tilt Sensing)
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These guidelines are an overview of typical borehole tiltmeter installation methods. They will help you achieve stable and reliable readings from the Lily Borehole Tiltmeters installed in shallow... (View Full Article)
(Tilt Sensing)
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The impulse was generated by rotating the clinometer through an angle of 3.4 degrees by pulling a gage block out from under one end of a Model 791 Tiltmeter Calibration Plate. The test was reproduced... (View Full Article)
(Tilt Sensing)
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The following graphs show the response of 900-Series Biaxial Clinometers to a sudden impulse.... (View Full Article)
(Force Sensing)
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The following graphs show the response of the viscously damped 59579-02 Wide-Angle Sensor to a sudden impulse. The impulse was generated by rotating the tiltmeter through angles of 19.8 and 4.4... (View Full Article)
(Vibration and Acceleration Sensing)
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Jewell accelerometers and inclinometers are precision inertial instruments. They utilize closed loop sensor technology to produce a highly accurate output with virtually infinite resolution. The... (View Full Article)
(Tilt Sensing)
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Surface mount tiltmeters are typically attached to the measurement surface by mounting studs (threaded rods) fastened or anchored into the surface. Three-point mounting is best because it prevents... (View Full Article)
(Tilt Sensing)
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Tiltmeter bias (B) as defined here is the difference between the true angle and the angle reported by the tiltmeter. Think of a perfectly horizontal surface with a Jewell tiltmeter sitting on it. If... (View Full Article)
(Tilt Sensing)
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Monitoring Dam Performance Using Tiltmeters... (View Full Article)
(Tilt Sensing)
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We reviewed our repair records for all 700-Series Platform and Surface Mount Tiltmeters sold during an 11-year period between February 9,1995 and February 8, 2006 to obtain an estimate of the mean... (View Full Article)
(Tilt Sensing)
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The Carnegie Institution of Washington has installed two Jewell Instruments Model 510 Geodetic Borehole Tiltmeters in the sea floor east of Japan. The scientists are attempting to establish long-term... (View Full Article)
(Tilt Sensing)
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In 1987 we delivered a large tiltmetering system to the Ásco 2 nuclear power plant for monitoring of foundation stability. As part of the acceptance process, four surface mount tiltmeters, Models 711... (View Full Article)
(Tilt Sensing)
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Over the past few years, the Colorado Department of Transportation has developed a unique relationship with Jewell Instruments. Jewell is CDOT's go-to for monitoring system design, install, data... (View Full Article)
(Tilt Sensing)
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After an "instantaneous" rotation of a 757-Series tilt sensor, the output settles to approximately 99.9% of its new value within eight time constants. Since the sensor's time constant is 0.13-second,... (View Full Article)
(Vibration and Acceleration Sensing)
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Output and Temperature versus time.... (View Full Article)
(Tilt Sensing)
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Accurately positioning large and small telescopes has always been a difficult problem. Jewell Instruments precision tiltmeters provide a simple and effective solution. Tiltmeters are unlike... (View Full Article)
(Tilt Sensing)
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The words tiltmeter, inclinometer and clinometer all refer to an inertially referenced device that measures angular rotation with respect to a vertical gravity vector, the most stable of all external... (View Full Article)
(Temperature Sensing)
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Environmental temperature changes alter the mechanical and electrical characteristics of all instrumentation. Metals expand and contract, and electrical properties such as resistance and capacitance... (View Full Article)
(Tilt Sensing)
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You can use Applied Geomechanics Tiltmeters and Miniature Tilt Sensors to level platforms and equipment within a few microradians of true level. Here's how:... (View Full Article)
(Tilt Sensing)
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To level the X- and Y-axes of the Model 520-W Geodetic Platform Tiltmeter, the user turns a knob that raises or lowers an invar screw by means of a worm gear assembly. One complete 360° turn of the... (View Full Article)