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|Title: ||(abstract) A Miniature, High-Sensitivity, Electron-Tunneling Accelerometer|
|Authors: ||Gabrielson, Thomas B.|
Rockstad, Howard K.
Tang, Tony K.
|Issue Date: ||28-Nov-1994 |
|Citation: ||Austin, Texas|
|Abstract: ||A prototype low-noise accelerometer has been fabricated with an electron-tunneling transducer. By measuring the tunneling current between an electrode on the proof mass and a feedback-controlled monitor electrode, very small accelerations can be detected with high responsivity. This particular prototype (10x10x1.5 mm) was designed for underwater acoustic measurement from a few hertz to 1 kHz. The measured responsivity below the fundamental device resonance at 100 Hz is roughly 1500 volts per m/s<SUP>2</SUP> with a measured noise spectral density of 10<SUP>-6</SUP> m/s<SUP>2</SUP> per root hertz or less between 30 and 300 Hz. The noise floor is controlled primarily by 1/f noise in the tunneling current although the noise floor reaches the theoretical molecular-agitation limit at 100 hertz. The responsivity and directivity of the device were measured in a standard gradient-hydrophone calibrator; the noise floor was determined in a vacuum-ionization chamber assembled from commercial off-the-shelf components; and the detailed dynamics of the proof-mass motion were examined using a heterodyne laser interferometer that was scanned across the surface and synchronously detected with respect to the excitation.|
|Appears in Collections:||JPL TRS 1992+|
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