Characterization of picometer repeatibility displacement meterology gauges
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metrology space interferometry mission interferome↗
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Characterization of Picometer repeatability displacement metrology gauges
A facility to test the linearity and drift of heterodyne laser metrology gauges for measuring distances of 1 to 7 meters with 10 picometer repeatability is described.
metrology space interferometry mission interferome↗
Wavefront versus amplitude division high precision displacement measuring interferometers
We discuss and compare different methods to reduce periodic nonlinear error and improve thermal stability. Experimental results will be presented and discussed.
metrology laser interferometers↗
Characterization of Picometer repeatibility displacement meteorology gauges
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metrology space interferometry mission interferome↗
The Mw7.6, Manyi (Tibet) Earthquake: Surface Rupture, Surface Displacement Field, and Fault Slip Solution from ERS SAR Data
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Earthquakes InSAR↗
Evidence of Non-Linear Elasticity of the Crust from the Mw7.6 Manyi (Tibet) Earthquake Surface Displacement Field
Satellite synthetic aperture radar (SAR) interferometry shows that the magnitude 7.6 Manyi earthquake of 8 November 1997 produces a 170 km-long surface break with up to 7m of left-lateral slip, reactivating a North 76 degrees East quaternary fault in western Tibet.
SAR Interferometry Earthquake↗
The Mw7.6, Manyi (Tibet) Earthquake: Surface Rupture, Surface Displacement Field, and Fault Slip Solution from ERS SAR Data
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Earthquake SAR Remote Sensing↗
Comparison of ice-shelf elastic deformation simulations with tidal displacements measured with ERS radar interferometry on Ronne Ice Shelf, Antarctica
Multiple radar inteferograms from the ERS satellite, may be used to eliminate the influence of the long-term velocity of an ice shelf to isolate the deformation signals associated with the cyclic, vertical motion of the ice shelf under the influence of tidal forcing from the ocean.
ice-shelf Ronne Ice Shelf Antarctica velocity↗
Imageodesy: A Tool for Mapping Subpixel Terrain Displacements in Satellite Imagery
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Mapping↗
An Algorithm For The Numerical Investigation of Large Displacement Domain Wall Motion
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Algorithm↗
Observation and Measurement of Horizontal Terrain Displacements Associated With the Landers Earthquake of 28 June 1992 Using Spot Panchromatic Imagery
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Landers Earthquake↗
GPS Detects Vertical Surface Displacements Caused by Atmospheric Pressure Loading
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tide gauge measurements sea level variations crust↗
Interferometric Detection of Freeze-Thaw Displacements of Alaskan Permafrost Using ERS-1
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Earth surface measurement SAR interferometry↗
Annealing displacement damage in GaAs LEDs: another Galileo success story
A recent failure of Galileo's magnetic recorder was identified as LED degradation. Annealing the culprit OP133s proved successful and the irreplaceable data was recovered. Test data and modeling results calibrate an understanding of this incident.
Galileo magnetic recorder LED annealing↗
Evidence of a North-South Asymmetry in the Heliosphere Associated with a Southward Displacement of the Heliospheric Current Sheet
Evidence of a north-south asymmetry in the global heliosphere, first inferred from Ulysses cosmic ray observations, is investigated using simultaneous Ulysses and WIND magnetic field observations.
asymmetry heliospheric current↗
JPL Solution for the Co- and Immediate Post-Seismic Displacements of SCIGN Stations in the 1999 Hector Mine Earthquake
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Hector Mine Earthquake SCIGN GPS↗
Signal processing for order 10 PM accuracy displacement metrology gauges in real-world scientific applications
The Space Interferometry Mission (SIM), Terrestrial Planet Finder (TPF) and James Web Space Telescope (JWST) need stable, reliable distance metrology with subnanometer accuracy.
interferometry↗
Radial displacement sensor for non-contact bearings
A radial position sensor includes four capacitive electrodes oriented about a shaft, arranged in two diametrically opposite pairs. Sensor circuitry generates an output signal in proportion to the capacitance between the electrodes and the shaft; the capacitance between an electrode and the shaft increases as the shaft approaches the electrode and decreases as the shaft recedes from the electrode. The sensor circuitry applies an alternating voltage to one electrode of a pair and a 180 degree out of phase alternating voltage to the other electrode of the pair. The electrical responses of the two electrodes to their respective input signals are summed to form a radial deviation signal which is relatively free from the alternating voltage and accurately represents the position of the shaft relative to the electrodes of the pair.
McCormick, John A.↗