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Silicon-Nitride Resonant Optical Gyroscope with Earth-Rate Sensitivity
Silicon-Nitride Resonant Optical Gyroscope with Earth-Rate Sensitivity
Detailed Information
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20250211152749
- ISBN
- 9798342107419
- DDC
- 620
- 서명/저자
- Silicon-Nitride Resonant Optical Gyroscope with Earth-Rate Sensitivity
- 발행사항
- [Sl] : Stanford University, 2024
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2024
- 형태사항
- 159 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 86-04, Section: B.
- 주기사항
- Advisor: Digonnet, Michel.
- 학위논문주기
- Thesis (Ph.D.)--Stanford University, 2024.
- 초록/해제
- 요약The interferometric fiber-optic gyroscope (FOG) is the world's most successful fiber sensor. Due to its high sensitivity and stability, the FOG is used in many navigation applications including satellites, aircrafts, and submarines. The main drawbacks FOGs are that they are expensive, bulky, and are not easily manufacturable. In the last decade, there has been an increasing research focus on improving miniaturized optical gyroscopes. This surge is driven in part by the emergence of drones, self-driving cars, and other autonomous vehicles. These technologies require navigational systems that do not rely on GPS signals, which can be blocked, unavailable, or intentionally jammed. There is a growing demand for gyroscopes that are small and inexpensive, but also have high performance. Specifically, to safely navigate autonomous vehicles, a gyroscope must meet tactical-grade specifications, which require a noise (or angular random walk (ARW)) of less than 0.05 deg/√h and a drift of better than 10 deg/h. Optical gyroscopes fabricated on silicon chips are a promising platform to satisfy this gap in the technology.This thesis focuses on improving the performance of a resonant optical gyroscope fabricated with a silicon-nitride (SiN) waveguide. The first generation (2021) of the chip-scale ring gyroscope was fabricated in the shape of a racetrack with a length of 37 mm and finesse of 1270. The gyro was interrogated with a 10-kHz linewidth laser that was tuned to a resonance with a low backscattering coefficient, and balanced detection was used to reduce reciprocal noise in the two counter-propagating signals. The lowest measured ARW, or minimum detectable rotation rate, was 1.3 deg/√h, the drift was 4000 deg/h, and the gyro output was limited by backscattering noise. This thesis describes the different techniques that were implemented to advance this technology towards achieving tactical-grade specifications.The two dominant noise sources in a ring gyro output, when using a probe laser with sufficiently low relative intensity noise, are backscattering noise and laser frequency noise. To reduce backscattering noise, a second generation gyro was fabricated with a lower finesse. The new device had a multi-turn spiral design with a total length of 1.2 m coiled on a 6.1-mm diameter footprint, and a finesse of 30. Other sources of noise and drift were investigated and reduced, including replacing mechanical connectors between components with fusion splices, reducing the laser frequency noise by using a laser with a narrower linewidth, and optimizing the electro-optic modulators, balanced detectors, and other components. When the multi-turn ring gyro was interrogated with a 90-Hz linewidth laser, the lowest measured ARW was 6.7 deg/h/√Hz, and the drift was 250 deg/h. Each of these values surpasses those measured by the first generation SiN gyro by more than an order of magnitude, and are approaching tactical-grade specifications.This thesis also highlights advancements in two additional research projects related to optical sensors. One project focuses on the development of a high-resolution fiber-Bragg-grating (FBG) sensor operated as a microphone and hydrophone. The investigation demonstrated that enhancing the resolution of an FBG sensor is achievable by applying an elastic coating to the fiber. However, the observed improvement in sensitivity did not match previous reports. The other project explores numerical and experimental methods aimed at improving the ARW of a FOG by optimizing the phase bias applied to the gyro. The results from each of these projects were achieved through a collaborative effort between previous graduate students and me. Conducting these research projects provided me with an introduction to the fundamentals of optical sensors and equipped me with practical experimental methods essential for my work on the chip-scale gyro project.
- 일반주제명
- Receivers & amplifiers
- 일반주제명
- Consumer electronics
- 일반주제명
- Silicon nitride
- 일반주제명
- Semiconductors
- 일반주제명
- Lasers
- 일반주제명
- Autonomous vehicles
- 일반주제명
- Microphones
- 일반주제명
- Unmanned aerial vehicles
- 일반주제명
- Spectrum allocation
- 일반주제명
- Acoustics
- 일반주제명
- Optics
- 일반주제명
- Virtual reality
- 일반주제명
- Aerospace engineering
- 일반주제명
- Electrical engineering
- 일반주제명
- Electromagnetics
- 일반주제명
- Information technology
- 일반주제명
- Robotics
- 기타저자
- Stanford University.
- 기본자료저록
- Dissertations Abstracts International. 86-04B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■00520250211152749
■006m o d
■007cr#unu||||||||
■020 ▼a9798342107419
■035 ▼a(MiAaPQ)AAI31520336
■035 ▼a(MiAaPQ)Stanfordww252hw3771
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a620
■1001 ▼aZawada, Adele Nicole.
■24510▼aSilicon-Nitride Resonant Optical Gyroscope with Earth-Rate Sensitivity
■260 ▼a[Sl]▼bStanford University▼c2024
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2024
■300 ▼a159 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 86-04, Section: B.
■500 ▼aAdvisor: Digonnet, Michel.
■5021 ▼aThesis (Ph.D.)--Stanford University, 2024.
■520 ▼aThe interferometric fiber-optic gyroscope (FOG) is the world's most successful fiber sensor. Due to its high sensitivity and stability, the FOG is used in many navigation applications including satellites, aircrafts, and submarines. The main drawbacks FOGs are that they are expensive, bulky, and are not easily manufacturable. In the last decade, there has been an increasing research focus on improving miniaturized optical gyroscopes. This surge is driven in part by the emergence of drones, self-driving cars, and other autonomous vehicles. These technologies require navigational systems that do not rely on GPS signals, which can be blocked, unavailable, or intentionally jammed. There is a growing demand for gyroscopes that are small and inexpensive, but also have high performance. Specifically, to safely navigate autonomous vehicles, a gyroscope must meet tactical-grade specifications, which require a noise (or angular random walk (ARW)) of less than 0.05 deg/√h and a drift of better than 10 deg/h. Optical gyroscopes fabricated on silicon chips are a promising platform to satisfy this gap in the technology.This thesis focuses on improving the performance of a resonant optical gyroscope fabricated with a silicon-nitride (SiN) waveguide. The first generation (2021) of the chip-scale ring gyroscope was fabricated in the shape of a racetrack with a length of 37 mm and finesse of 1270. The gyro was interrogated with a 10-kHz linewidth laser that was tuned to a resonance with a low backscattering coefficient, and balanced detection was used to reduce reciprocal noise in the two counter-propagating signals. The lowest measured ARW, or minimum detectable rotation rate, was 1.3 deg/√h, the drift was 4000 deg/h, and the gyro output was limited by backscattering noise. This thesis describes the different techniques that were implemented to advance this technology towards achieving tactical-grade specifications.The two dominant noise sources in a ring gyro output, when using a probe laser with sufficiently low relative intensity noise, are backscattering noise and laser frequency noise. To reduce backscattering noise, a second generation gyro was fabricated with a lower finesse. The new device had a multi-turn spiral design with a total length of 1.2 m coiled on a 6.1-mm diameter footprint, and a finesse of 30. Other sources of noise and drift were investigated and reduced, including replacing mechanical connectors between components with fusion splices, reducing the laser frequency noise by using a laser with a narrower linewidth, and optimizing the electro-optic modulators, balanced detectors, and other components. When the multi-turn ring gyro was interrogated with a 90-Hz linewidth laser, the lowest measured ARW was 6.7 deg/h/√Hz, and the drift was 250 deg/h. Each of these values surpasses those measured by the first generation SiN gyro by more than an order of magnitude, and are approaching tactical-grade specifications.This thesis also highlights advancements in two additional research projects related to optical sensors. One project focuses on the development of a high-resolution fiber-Bragg-grating (FBG) sensor operated as a microphone and hydrophone. The investigation demonstrated that enhancing the resolution of an FBG sensor is achievable by applying an elastic coating to the fiber. However, the observed improvement in sensitivity did not match previous reports. The other project explores numerical and experimental methods aimed at improving the ARW of a FOG by optimizing the phase bias applied to the gyro. The results from each of these projects were achieved through a collaborative effort between previous graduate students and me. Conducting these research projects provided me with an introduction to the fundamentals of optical sensors and equipped me with practical experimental methods essential for my work on the chip-scale gyro project.
■590 ▼aSchool code: 0212.
■650 4▼aReceivers & amplifiers
■650 4▼aConsumer electronics
■650 4▼aGlobal positioning systems--GPS
■650 4▼aSilicon nitride
■650 4▼aSemiconductors
■650 4▼aLasers
■650 4▼aAutonomous vehicles
■650 4▼aMicrophones
■650 4▼aUnmanned aerial vehicles
■650 4▼aSpectrum allocation
■650 4▼aAcoustics
■650 4▼aOptics
■650 4▼aVirtual reality
■650 4▼aAerospace engineering
■650 4▼aElectrical engineering
■650 4▼aElectromagnetics
■650 4▼aInformation technology
■650 4▼aRobotics
■690 ▼a0752
■690 ▼a0986
■690 ▼a0538
■690 ▼a0544
■690 ▼a0607
■690 ▼a0489
■690 ▼a0771
■71020▼aStanford University.
■7730 ▼tDissertations Abstracts International▼g86-04B.
■790 ▼a0212
■791 ▼aPh.D.
■792 ▼a2024
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17163755▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
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