Non-Metallized Dual-Shell Hemispherical Resonator Gyroscope

Austin R. Parrish, Nicholas A. Strnad, Zachariah J. Klutts, Lois Meira Lopez, Danmeng Wang, Jeffrey S. Pulskamp, and Andrei M. Shkel

Peer Reviewed

Abstract:	This paper presents non-metallized dual-shell hemispherical resonator gyroscope (DSG) operation. The study addresses three key challenges: non-metallized driving, sensing, and tuning. Non-metallized driving is achieved using indirect piezoelectric excitation (IPE) with atomic layer deposited lead hafnate titanate (ALD PHT) on the outer shell. Sensing is accomplished using two commercial, benchtop laser doppler vibrometers (LDVs) to probe the drive and sense wineglass antinodes, serving as a prototype of future all-optical detection with interferometers implemented using Photonic Integrated Circuits (PIC). Tuning is performed through laser ablation trimming, reducing the frequency split from 50-60 Hz as-fabricated to under 1 Hz, the lowest being 0.39Hz. The paper demonstrates successful non-metallized gyroscope operation with a scale factor of 0.02 mV/(deg/s). This approach shows promise for achieving unparalleled HRG performance by eliminating metallizationinduced energy losses. Index Terms—Hemispherical Resonator Gyroscope, optomechanical gyroscope, piezoelectric excitation, trimming, laser ablation
Published in:	2025 IEEE/ION Position, Location and Navigation Symposium (PLANS) April 28 - 1, 2025 Salt Lake Marriott Downtown at City Creek Salt Lake City, UT
Pages:	131 - 135
Cite this article:	Parrish, Austin R., Strnad, Nicholas A., Klutts, Zachariah J., Lopez, Lois Meira, Wang, Danmeng, Pulskamp, Jeffrey S., Shkel, Andrei M., "Non-Metallized Dual-Shell Hemispherical Resonator Gyroscope," 2025 IEEE/ION Position, Location and Navigation Symposium (PLANS), Salt Lake City, UT, April 2025, pp. 131-135.
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