公开(公告)号：US20180140233A1

公开(公告)日：2018-05-24

申请号：US15863027

申请日：2018-01-05

申请人： Massachusetts Institute of Technology

发明人： Joseph J. Lacirignola ,  Trina Rae Vian ,  Christopher J. Smalt ,  David F. Aubin, JR. ,  David C. Maurer ,  Mary Katherine Byrd ,  Christine M. Weston ,  Kerry A. Johnson ,  Shakti Davis ,  Olha Townsend ,  Paul T. Calamia ,  Edward H. Chen ,  Paula P. Collins

IPC分类号： A61B5/12 ,  G01H3/12 ,  A61B5/00

CPC分类号： A61B5/125 ,  A61B5/6814 ,  A61B5/721 ,  G01H3/12 ,  G01H3/14

摘要： Systems, apparatus, and methods for collecting, interpreting, and utilizing noise exposure data may include sensors to obtain an analog signal representative of impulse noise sound pressure and an analog signal representative of continuous noise sound pressure. At least one ADC may generate digital signals by sampling the analog signals at rates equal to or greater than twice the reciprocal of a minimum impulse noise rise time. Accelerometers may obtain data in close proximity to and remote from the sensors. At least one processor may include a first combining node to combine the digital signals to represent both the continuous noise and the impulse noise, a shock-artifact detection filter to identify a time frame including a shock artifact based on the accelerometry data, a frequency filter to generate a background-removed audio signal, an adaptive filter to estimate the shock artifact, and a second combining node to produce a shock-artifact-free audio signal.

公开(公告)号：US10264999B2

公开(公告)日：2019-04-23

申请号：US15863027

申请日：2018-01-05

申请人： Massachusetts Institute of Technology

发明人： Joseph J. Lacirignola ,  Trina Rae Vian ,  Christopher J. Smalt ,  David F. Aubin, Jr. ,  David C. Maurer ,  Mary Katherine Byrd ,  Christine M. Weston ,  Kerry A. Johnson ,  Shakti Davis ,  Olha Townsend ,  Paul T. Calamia ,  Edward H. Chen ,  Paula P. Collins

IPC分类号： G01H3/14 ,  G01H3/12 ,  A61B5/00 ,  A61B5/12

摘要： Systems, apparatus, and methods for collecting, interpreting, and utilizing noise exposure data may include sensors to obtain an analog signal representative of impulse noise sound pressure and an analog signal representative of continuous noise sound pressure. At least one ADC may generate digital signals by sampling the analog signals at rates equal to or greater than twice the reciprocal of a minimum impulse noise rise time. Accelerometers may obtain data in close proximity to and remote from the sensors. At least one processor may include a first combining node to combine the digital signals to represent both the continuous noise and the impulse noise, a shock-artifact detection filter to identify a time frame including a shock artifact based on the accelerometry data, a frequency filter to generate a background-removed audio signal, an adaptive filter to estimate the shock artifact, and a second combining node to produce a shock-artifact-free audio signal.

公开(公告)号：US11448676B2

公开(公告)日：2022-09-20

申请号：US16819268

申请日：2020-03-16

申请人： Massachusetts Institute of Technology

发明人： Danielle Ann Braje ,  Edward H. Chen ,  Phillip R. Hemmer

IPC分类号： G01R29/08 ,  G01R33/32

摘要： Sensing the electric or strain field experienced by a sample containing a crystal host comprising of solid state defects under a zero-bias magnetic field can yield a very sensitive measurement. Sensing is based on the spin states of the solid-state defects. Upon absorption of suitable microwave (and optical) radiation, the solid-state defects emit fluorescence associated with hyperfine transitions. The fluorescence is sensitive to electric and/or strain fields and is used to determine the magnitude and/or direction of the field of interest. The present apparatus is configured to control and modulate the assembly of individual components to maintain a zero-bias magnetic field, generate an Optically Detected Magnetic Resonance (ODMR) spectrum (with or without optical excitation) using appropriate microwave radiation, detect signals based on the hyperfine state transitions that are sensitive to electric/strain fields, and to quantify the magnitude and direction of the field of interest.

公开(公告)号：US09709440B2

公开(公告)日：2017-07-18

申请号：US14325502

申请日：2014-07-08

申请人： MASSACHUSETTS INSTITUTE OF TECHNOLOGY

发明人： Dirk Robert Englund ,  Edward H. Chen ,  Fan Meng ,  Tim Schroder ,  Noel Heng Loon Wang ,  Ren-Jye Shiue

IPC分类号： G01J3/02 ,  G01J3/453 ,  G02B6/42 ,  G02B6/293

CPC分类号： G01J3/0205 ,  G01J3/0218 ,  G01J3/0256 ,  G01J3/453 ,  G02B6/29344 ,  G02B6/4287

摘要： Multimode interference can be used to achieve ultra-high resolving powers (e.g., Q>105) with linewidths down to 10 pm at 1500 nm and a broad spectroscopy range (e.g., 400-2400 nm) within a monolithic, millimeter-scale device. For instance, multimode interference (MMI) in a tapered waveguide enables fine resolution and broadband spectroscopy in a compact, monolithic device. The operating range is limited by the transparency of the waveguide material and the sensitivity of the camera; thus, the technique can be easily extended into the ultraviolet and mid- and deep-infrared spectrum. Experiments show that a tapered fiber multimode interference spectrometer can operate across a range from 500 nm to 1600 nm (B=1.0576) without moving parts. The technique is suitable for on-chip tapered multimode waveguides, which could be fabricated in high volume by printing or optical lithography, for applications from biochemical sensing to the life and physical sciences.