• Overview
  • Sensors
  • Algorithms
  • Applications
  • Publications
  • Collaborations
  • Sensors

    QUASAR’s participation in prior DoD and DARPA programs has produced revolutionary new dry sensor technology for bioelectric measurements through hair, off the skin, and even through clothing.

    • Dry sensor: QUASAR’s sensors are easy to use and produce high fidelity signals without skin preparation and gels. The lack of gels facilitates maintenance of contact, enables long-term wear without skin irritation, and leaves no messy residue.
    • Low Noise: Patented shielding and circuit design, and common-mode cancellation technology reduce electrostatic noise and motion artifacts enabling quality ambulatory data collection in electronically noisy environments.
    • This proprietary sensing technology has been optimized for EEG, ECG, EMG, and EOG applications.

      Contact Sensors

        Hybrid resistive-capacitive sensors enables the omission of conductive gels during EEG, ECG, EMG, or EOG recordings.
        Through-hair pin design facilitates operation on most hair types.
        These dry sensors have been tested in a variety of contexts and proven to record EEG and ECG signals with fidelity comparable to wet electrodes.
    • Non-Contact Sensors

      QUASAR has also developed non-contact capacitive sensors that record ECG, EMG, or EOG signal through clothes.
      These sensors have been integrated into various garments, including T-shirts and body-armor, as well as furniture such as chairs and beds.

        • Development of a Heart Monitoring System using Standoff Electric Field Sensors

        Under Phase II SBIR funding, a new class of non-contact through-clothes ECG monitoring systems was developed, based upon QUASAR’s innovative capacitive bioelectrode technology. QUASAR constructed a prototype ECG acquisition system and acquired data on subjects in various states of ambulation to define the system’s parameters. The data shown below were taken on a subject who was walking
    • Integrated EEG-fNIR Sensors

      Under a U.S. Army funded Phase I SBIR project was to develop an integrated EEG-fNIR measurement system for in-field collection of TBI data. The goal of the project was to establish an initial approach for producing a system for simultaneous EEG and fNIRs measurements. We designed and built a proof-of-concept prototype of the integrated sensor. We also conceived a prototype headset for mounting. Effort on the project identified and established mitigation strategies for project technical risk, and defined a strategy for the coding architecture and user interface.

      Other Sensors

      QUASAR often integrates additional sensor modalities into its systems. Sensors already implemented include:
        • Temperature sensors
        • 3-D accelerometers

      Wearable Dry Sensor Technology

      In order to use the sensors and algorithms in real-world applications, QUASAR has developed numerous solutions to comfortably attaching sensors to human subjects, including a headset (DSI 10/20) to hold 21 EEG sensors at locations according to the 10/20 International System, and a 9-sensor headset structure was integrated into a standard Army helmet for ambulatory EEG acquisition. ECG and EMG sensors have also been integrated into various garments, including T-shirts and body-armor.

      QUASAR’s suite of wearable physiological sensors was developed under funding from various government and privately projects, including the following:

        • Remote Neurological Measurement and Sensing
        • Responder Wireless Physiological Monitoring Device
        • System Integration Tests of Through-Clothing Bioelectrodes with the Land Warrior System