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Fabrication and Characterization of Superconducting Resonators

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Published on: May 21, 2016

Superconducting accelerometer using niobium-on-sapphire rf resonator.

¹Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, USA.

The Review of Scientific Instruments

|March 1, 1979

Summary

This study introduces a novel accelerometer utilizing a radio frequency (RF) niobium-on-sapphire resonator. This high-sensitivity device achieves remarkable displacement sensitivity, ideal for audio frequency measurements.

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Area of Science:

Physics
Materials Science
Sensor Technology

Background:

Traditional accelerometers face limitations in sensitivity and frequency response.
The need for highly sensitive motion detection in various scientific applications is growing.

Purpose of the Study:

To develop a novel accelerometer with enhanced sensitivity and a wide frequency range.
To explore the use of radio frequency (RF) niobium-on-sapphire resonators in accelerometry.

Main Methods:

Utilizing a magnetically levitated spool as the test mass within the accelerometer.
Employing a servo control system to maintain the resonator at the external RF excitation frequency.
Modulating the inductance of the RF niobium-on-sapphire resonator with the test mass position.

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Main Results:

The accelerometer demonstrates high sensitivity across the full audio frequency range.
Optimized performance is achieved between 100 Hz and 1 kHz.
Calculated displacement sensitivity approaches 10(-15) cm for a 1 Hz measurement bandwidth.

Conclusions:

The RF niobium-on-sapphire resonator-based accelerometer offers significant advancements in sensitivity.
The design shows promise for applications requiring precise measurement of low-frequency vibrations.
Further analysis of system noise sources and potential improvements are discussed.