Re-entrant cavity accelerometer with high bias stability

Sinha, P and Rao, CVN and Vinoy, KJ and Jyoti, R (2021) Re-entrant cavity accelerometer with high bias stability. In: IEEE Sensors Journal, 21 (4). pp. 4333-4341.

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Abstract

Accelerometers with high resolution and high bias stability are required for tracking and navigation in various tactical applications. This paper presents the design and experimental validation of an inertial grade microwave re-entrant cavity-based accelerometer with RF readout. A model for the sensitivity of a re-entrant cavity is developed, and its design parameters are optimized to achieve a high scale factor. The RF readout of the sensor uses a cavity-stabilized oscillator (CSO), which is frequency locked to the cavity, to obtain a low close-in phase noise output. This method of locking the oscillator to the cavity is relatively simple and does not require any modulation techniques, as reported in previous works. A mathematical model of flicker noise power spectral density of the CSO is developed to design the CSO components for an accelerometer resolution of 1μg. A scale factor of 1.25 MHz/g and bias stability of 1 ng were achieved for the fabricated sensor with a measurement range of ±1 g even without using active temperature control. This is one of the best scale factors, and bias stability reported to date in a similar accelerometer fabricated using conventional machining. The proposed design can be used for compact, low-cost inertial grade accelerometers. © 2001-2012 IEEE.

Item Type:	Journal Article
Publication:	IEEE Sensors Journal
Publisher:	Institute of Electrical and Electronics Engineers Inc.
Additional Information:	The copyright of this article belongs to Institute of Electrical and Electronics Engineers Inc.
Keywords:	Phase noise; Spectral density; Stability, Accelerometer resolutions; Active temperature control; Conventional machining; Experimental validations; Fabricated sensors; Measurement range; Modulation techniques; Re-entrant cavities, Accelerometers
Department/Centre:	Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited:	16 Feb 2021 11:53
Last Modified:	16 Feb 2021 11:53
URI:	http://eprints.iisc.ac.in/id/eprint/67929

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