Earbudembedded Micropower Mmsized Optical Sensor For Accurate Heart Beat Monitoring

• doi: 10.1109/JSEN.2021.3098861
• title: Earbud-Embedded Micro-Power mm-Sized Optical Sensor for Accurate Heart Beat Monitoring
• publisher: IEEE
• isbn:
• issn: 2379-9153
• rank: 2341
• access_type: LOCKED
• content_type: Journals
• abstract: This work demonstrates that accurate hear beat monitoring, via photoplethysmography (PPG), can be performed at micro-power consumption level with an ear worn device. This is achieved thanks to the combination of a highly sensitive low power PPG chip, an optimal optical module, and an ergonomic design of the wearable device. The monolithic optical sensor is fabricated in a 180nm CMOS image sensor (CIS) process and features an area of 1.5mm by 1.5mm only. It implements an array of pixels, newly designed for PPG, and reaching a quantum efficiency of 85% up to 800nm. The presented sensor consumes 60 μA at 122Hz sampling frequency, including digital communication. The optical design optimization enables high signal-to-noise ratio (SNR) PPG signals with less than 10 μA average LED current. Heart beat monitoring, using the presented wearable device, is performed on 7 subjects and compared with a medical electrocardiogram (ECG). The earbud device correctly detects 98.47% of the beats on a total of 72.21 hours of recordings. The inter-beat interval (IBI) estimation from these recordings features a mean absolute error (MAE) as low as 7.52ms.
• article_number: 9492124
• pdf_url: https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=9492124
• html_url: https://ieeexplore.ieee.org/document/9492124/
• abstract_url: https://ieeexplore.ieee.org/document/9492124/
• publication_title: IEEE Sensors Journal
• conference_location:
• conference_dates:
• publication_number: 7361
• is_number: 9539108
• publication_year: 2021
• publication_date: 15 Sept.15, 2021
• start_page: 19967
• end_page: 19977
• citing_paper_count: 11
• citing_patent_count: 0
• download_count: 768
• insert_date: 20210721
• index_terms:
  • ieee_terms:
    • Sensors
    • Light emitting diodes
    • Sensor arrays
    • Monitoring
    • Signal to noise ratio
    • Performance evaluation
    • Optical sensors
  • author_terms:
    • PPG
    • PPD
    • ultra-low-power
    • CMOS
    • sensor
    • IBI
    • wearable
  • dynamic_index_terms:
    • Optical Sensors
    • Accurate Monitoring
    • Heart Beat
    • Heartbeat Monitoring
    • Heart Beat Monitoring
    • Accurate Heartbeat
    • Accurate Heart Beat
    • Low Power
    • Mean Absolute Error
    • Wearable Devices
    • Wearable Technology
    • Quantum Efficiency
    • Optical Modes
    • Transverse Modes
    • Ergonomic
    • Photoplethysmography
    • Optical Design
    • Pixel Array
    • Interbeat Intervals
    • Inter-beat-intervals
    • Hours Of Recordings
    • PPG Signal
    • Dynamic Light
    • Power Consumption
    • Heart Rate Variability
    • Electrocardiogram Recordings
    • Dc Component
    • Ambient Light
    • Ectopic Beats
    • Mean Absolute Percentage Error
    • MAPE
    • Heartbeat Detection
    • Tight Constraints
    • LED Driver
    • LED Circuit
    • Optical Power
    • Lens Power
    • Refractive Power
    • Epitaxial Layer
    • Epilayer
• authors:
  • Author Name: Assim Boukhayma
    Affiliation: Senbiosys SA, Neuchâtel, Switzerland
    Author URL: https://ieeexplore.ieee.org/author/37085418249
    ID: 37085418249
    Order: 1
    Author Affiliations:
    • Senbiosys SA, Neuchâtel, Switzerland
  • Author Name: Anthony Barison
    Affiliation: Senbiosys SA, Neuchâtel, Switzerland
    Author URL: https://ieeexplore.ieee.org/author/37085378722
    ID: 37085378722
    Order: 2
    Author Affiliations:
    • Senbiosys SA, Neuchâtel, Switzerland
  • Author Name: Serj Haddad
    Affiliation: Senbiosys SA, Neuchâtel, Switzerland
    Author URL: https://ieeexplore.ieee.org/author/37088966236
    ID: 37088966236
    Order: 3
    Author Affiliations:
    • Senbiosys SA, Neuchâtel, Switzerland
  • Author Name: Antonino Caizzone
    Affiliation: Senbiosys SA, Neuchâtel, Switzerland
    Author URL: https://ieeexplore.ieee.org/author/37086171917
    ID: 37086171917
    Order: 4
    Author Affiliations:
    • Senbiosys SA, Neuchâtel, Switzerland

Image Sensor

• sensor_type: CMOS
• resolution: 1.5 mm by 1.5 mm (area of the sensor)
• dynamic_range: 90 dB
• pixel_size: Not explicitly mentioned, but pixels are implemented in a small area
• dark_current: Low dark current (specific value not mentioned)

Optical Data

• focal_length: Not provided
• aperture: Not provided
• field_of_view: Not provided
• distortion: Not provided

Performance Metrics

• frame_rate: 122 Hz
• signal_to_noise_ratio: 85 dB after digital filtering
• sensitivity: Not provided
• shutter_speed: Not provided
• power_consumption: 60 µA at a sampling frequency of 122 Hz, including digital communication
• noise: Measured SNR of 75 dB without digital filtering

Applications & Benefits

• cell_imaging: Non-invasive monitoring of vital signs such as heart rate through photoplethysmography (PPG)
• benefits: Low power consumption and miniaturization suitable for wearable devices

Supporting Organizations

• supported_by: Senbiosys SA, EPFL

Manuscript Details

• publication_date: 15 Sept.15, 2021

Relevancy Score

• score: 10
• missing_fields:
  • focal_length
  • aperture
  • field_of_view
  • distortion
  • sensitivity
  • shutter_speed

Processed JSON Filename

request_3c337bfa-2a94-48cd-9ad1-ba0cdc9d61ee-earbudembedded_micropower_mmsized_optical_sensor_for_accurate_heart_beat_monitoring.json