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Dream Detection

[last updated: 2025-04-20]
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  • Dreams are accompanied by REM, rapid eye movement.
    REM's can be detected with a variety of sensor methods.

  • Detection methods:
    • EMG, ie. electromyograph:
      ie. measuring the voltage (micro or milli volt level) produced by the eye muscles when they contract
    • IR, ie. infrared:
      illuminate the eye area with infrared light, then have a sensor that detects IR light that picks up reflected light.
      the amount of reflected light will change when the eye twitches.

    • Mouse sensors:
      Using the sensor used in a mouse.
      https://onlinelibrary.wiley.com/doi/10.1155/2019/3931713
      • In practice, an LED light source is used to illuminate the area under the mouse, and a sensor (camera) looks at the area. In operation as a mouse sensor, when the mouse is moved, the image of the area under it changes, and image analysis software detects that change and determines the amount and direction of movement.
      • Some mouse's use visible wavelength LED's ("optical mouse"), while others use infrared (IR) or near-infrared (NIR) LED's
      • An alternative light source described in the link above is the SFH 4350 LED, using 60mm between sensor and area of interest.
        It has a 3 mm (T1) transparent plastic package, a wavelength peak of 850 nm, and 26° of view angle. Its typical operation generates a radiant flux of 50 mW at a forward current of 100 mA.
      • The optical flow sensor used is the ADNS-3080 from Avago Technologies. It has a 30x30 greyscale pixel (4-bit intensity) image which is highly sensitive to near-infrared wavelength. [or ADNS-3060 from Broadcom]
      • It is coupled with a digital signal processor (DSP). Although it implements a proprietary optical flow algorithm for displacement measurements, it includes an extra feature called PIXEL_GRAB which allows access to the current surface image (900 byte frame). It is an instantaneous snapshot in time and can be read at any asynchronous rate, pixel by pixel, through a standard serial peripheral interface (SPI) bus.
      • The sensor is combined with a polycarbonate plastic convex lens. The default Avago lenses kit is ADNS-2120-001. The recommended working height is 2.4 mm. The sensor can measure two-dimensional displacements with resolutions up to 800 counts per inch (cpi). Using this configuration, the working area captured by the sensor is very small (1.82 mm2).
      • The lens suggested is the CAY46 aspheric lens from Laser Components which has a focal distance of 4.6 mm.
        https://www.lasercomponents.com/

    • accelerometers:
    • piezo sensors

  • References:


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