公开(公告)号：US20240329077A1

公开(公告)日：2024-10-03

申请号：US18624318

申请日：2024-04-02

Applicant: SensiBel AS

Inventor： Sigbjørn Kolberg ,  Matthieu Lacolle ,  Hallvard Angelskår

IPC: G01P15/093 ,  G01P15/08 ,  G01P15/13

CPC classification number: G01P15/093 ,  G01P15/0802 ,  G01P15/13 ,  G01P2015/084

Abstract: An optical accelerometer including an interferometric arrangement, a light source, a photodetector, a support structure that is static relative to the light source and photo detector, and a dual-layer membrane that is deflectable relative to the support structure. The dual-layer membrane includes first and second membrane layers that are mechanically coupled by a proof mass that is positioned between and attached to or integrally formed with the membrane layers. The interferometric arrangement includes a first optical element which includes or is disposed on a surface of one of the membrane layers and which is moveable relative to a second optical element which includes or is disposed on a surface of the support structure. The second optical element and at least part of the support structure are positioned between the membrane layers. The light source provides light to the interferometric arrangement and the photo detector detects an interference pattern generated by the light that is dependent on a distance between the first and second optical elements.

公开(公告)号：US20240295581A1

公开(公告)日：2024-09-05

申请号：US18590519

申请日：2024-02-28

Applicant: NORTHROP GRUMMAN SYSTEMS CORPORATION

Inventor： Vyacheslav Lebedev ,  Steven Ryan Jefferts

IPC: G01P15/093 ,  G01P15/13 ,  G02B26/00

CPC classification number: G01P15/093 ,  G01P15/13 ,  G02B26/001

Abstract: One example includes an optical accelerometer system. The system includes an optical cavity system comprising a variable optical cavity that propagates a first optical beam and a fixed optical cavity that propagates a second optical beam. The fixed optical cavity can have a fixed cavity length and the variable optical cavity can have a cavity length that changes in response to an external acceleration. The optical cavity system can also include optics to provide a beat optical beam that is a combination of the first and second optical beams. The system also includes a detection system to monitor the beat optical beam to generate a beat voltage that is indicative of the frequency of the beat optical beam. The detection system can compare the beat voltage with a stable frequency reference voltage to determine a magnitude of the external acceleration.

公开(公告)号：US11899038B2

公开(公告)日：2024-02-13

申请号：US17785709

申请日：2020-12-18

Applicant: Resonac Corporation

Inventor： Yasunao Miyamura ,  Yasushi Kadowaki ,  Kuniaki Yamatake ,  Masanao Hara ,  Shigeru Yamaki ,  Hideki Ohata

IPC: G01P15/03 ,  G01P15/093

CPC classification number: G01P15/03 ,  G01P15/093

Abstract: An acceleration sensor is provided in which a sensitive color plate is provided between two polarizing plates that are in a crossed Nicol disposition, and a silver nanowire dispersion is disposed between the sensitive color plate and one of the polarizing plates.

公开(公告)号：US11726106B2

公开(公告)日：2023-08-15

申请号：US17448068

申请日：2021-09-20

Applicant: Intuitive Surgical Operations, Inc.

Inventor： Stephen J. Blumenkranz ,  Lawton N. Verner

IPC: G01P15/093 ,  G02B6/34 ,  G01L1/22

CPC classification number: G01P15/093 ,  G02B6/34 ,  G01L1/2225

Abstract: An accelerometer is included within the confined space and limited volume of a distal portion of a surgical instrument. The surgical instrument includes an end component, a joint coupled to the end component, a shaft coupled to the joint, and a force transducer and accelerometer apparatus. The force transducer and accelerometer apparatus is coupled between the joint and the shaft. The force transducer and accelerometer apparatus includes a force sensor and an accelerometer. The accelerometer includes an optic fiber having a Fiber Bragg Grating. Information acquired from the Fiber Bragg Grating is used to drive a vibro-tactile haptic feedback output device coupled to a master control arm surgeon grip.

公开(公告)号：US20230010787A1

公开(公告)日：2023-01-12

申请号：US17305427

申请日：2021-07-07

Applicant: NXP B.V.

Inventor： Nikita Veshchikov ,  Arnold Braine

IPC: G01P15/097 ,  G01H1/14 ,  G01H11/08 ,  G01H17/00 ,  G01P15/093

Abstract: A method is provided for identifying or authenticating an object. The method includes vibrating the object at a plurality of frequencies. The vibrations from the object are sensed at each of the plurality of frequencies using an accelerometer. A vibration profile of the object is generated using the sensed vibrations. The generated vibration profile is then compared to a stored vibration profile. It is determined if the generated vibration profile matches the stored vibration profile. A match indicates that the object has been identified or authenticated. In another embodiment, an object capable of implementing the method is provided. In another embodiment, the object may include a replaceable accessary. In this case, the initial and generated vibration profiles may be created with the replacement accessary attached to the object. A match of the generated and initial vibration profiles indicates that the replaceable accessary is authentic.

公开(公告)号：US11493530B2

公开(公告)日：2022-11-08

申请号：US16677842

申请日：2019-11-08

Applicant: Massachusetts Institute of Technology

Inventor： Suraj Deepak Bramhavar ,  Paul William Juodawlkis

IPC: G01P15/097 ,  H03H3/007 ,  G01P15/093 ,  H03H9/24 ,  H03H9/02

Abstract: The accelerometers disclosed herein provide excellent sensitivity, long-term stability, and low SWaP-C through a combination of photonic integrated circuit technology with standard micro-electromechanical systems (MEMS) technology. Examples of these accelerometers use optical transduction to improve the scale factor of traditional MEMS resonant accelerometers by accurately measuring the resonant frequencies of very small (e.g., about 1 μm) tethers attached to a large (e.g., about 1 mm) proof mass. Some examples use ring resonators to measure the tether frequencies and some other examples use linear resonators to measure the tether frequencies. Potential commercial applications span a wide range from seismic measurement systems to automotive stability controls to inertial guidance to any other application where chip-scale accelerometers are currently deployed.

公开(公告)号：US20220341963A1

公开(公告)日：2022-10-27

申请号：US17717169

申请日：2022-04-11

Applicant: Shenzhen Conjugate Technology Co., Ltd.

Inventor： Hengjiang REN ,  Jie LUO

IPC: G01P15/093 ,  G01H9/00

Abstract: An accelerometer structure, a method for preparing the accelerometer structure and an acceleration measurement method are provided. The accelerometer structure includes a substrate having a groove structure, a test mass, a plurality of nano-tethers, and a nano-photonic-crystal measurement unit. The test mass, nano-tethers, and the nano-photonic-crystal measurement unit are suspended above the groove structure. A nano-photonic-crystal resonant cavity is formed in the nano-photonic-crystal measurement unit, and an acceleration of the test mass is characterized by a resonant frequency of the nano-photonic-crystal resonant cavity. The present disclosure provides a photoelasticity-based opto-micromechanical accelerometer structure, which uses a cavity resonance tension sensor in a nano-photonic-crystal cavity to measure a tension of the nano-photonic-crystal resonant cavity. The tension is concentrated in the nano-photonic-crystal resonant cavity, which makes the measurement of the tension more accurate and the resolution higher. Photoelastic-optomechanical coupling is also increased due to the nano-photonic-crystal resonant cavity.

公开(公告)号：US11456086B1

公开(公告)日：2022-09-27

申请号：US17026810

申请日：2020-09-21

Applicant: AOSense, Inc.

Inventor： Miroslav Y. Shverdin ,  Matthew Todd Cashen ,  Micah P. Ledbetter ,  Martin M. Boyd ,  Michael R. Matthews ,  Alexander F. Sugarbaker ,  Adam T. Black ,  Akash Rakholia ,  Igor Teper

IPC: G21K1/00 ,  G01P15/093 ,  G01V7/04

Abstract: A high bandwidth gravimeter or accelerometer includes laser(s), modulator(s), and an atomic interferometer. The laser(s) and modulator(s) produce four laser frequencies. A first and second pair of laser frequencies are each separated by wm. The first and second pair are offset by wshift. A first laser frequency of the first pair and a second laser frequency of the second pair are separated by wm+wshift. A second laser frequency of the first pair and a first laser frequency of the second pair are separated by wm−wshift. The first pair is routed to arrive from a first direction at atoms in an interaction region, and the second pair from a second direction. The first pair are phase stable with respect to the second pair. wm is adjusted so that wm+wshift or wm−wshift corresponds to a Raman resonance for the atomic interferometer.

公开(公告)号：US11340252B2

公开(公告)日：2022-05-24

申请号：US16618595

申请日：2019-05-31

Applicant: BOE TECHNOLOGY GROUP CO., LTD.

Inventor： Hong Wang ,  Changlin Leng

IPC: G01P15/093

Abstract: An acceleration measuring device includes a housing with an inner cavity, a reference substance disposed in the inner cavity, an elastic supporting member connected between the bottom portion of the inner cavity and the reference substance, a light source secured to a side of the reference substance, a lens secured to the reference substance that is positioned at a side of the light source away from the reference substance, an image sensor at a top portion of the inner cavity and located at a side of the lens away from the reference substance for receiving light emitted by the light source and scattered by the lens, and a processor configured to calculate displacement information of the reference substance in a vertical direction according to light received by the image sensor, and calculate an acceleration of the reference substance according to the displacement information.

公开(公告)号：US20220065892A1

公开(公告)日：2022-03-03

申请号：US17412355

申请日：2021-08-26

Applicant: Seiko Epson Corporation

Inventor： Kohei YAMADA

IPC: G01P15/093 ,  H01S5/00 ,  G02F1/11 ,  G02F2/00

Abstract: A laser interferometer includes a light source that emits first laser light, an optical modulator that includes a vibrator and modulates the first laser light by using the vibrator to generate second laser light including a modulated signal, a photodetector that receives interference light between third laser light including a sample signal generated by reflecting the first laser light on an object and the second laser light to output a light reception signal, and a demodulation circuit that performs a demodulation process for demodulating the sample signal from the light reception signal, and the demodulation circuit intermittently performs the demodulation process.