How Delian works
Next-generation speckle contrast imaging in a wearable form.
Pulse
Delian sends microsecond pulses of 795 nm near-infrared laser light into tissue. Class 1 emissions keep exposure minimal.
Scatter
The light scatters off red blood cells. Where blood moves faster, the speckle pattern it forms blurs more.
Read
A global-shutter CMOS camera measures that speckle contrast 40 times a second and converts it into blood flow and blood volume indices.
Light travels a banana-shaped path from source to detector; wider spacing reaches deeper tissue.
Two outputs, measured on both sides
How fast blood is moving through the tissue under the sensor, calculated from the blurring of the laser speckle pattern.
How much blood is present in that tissue, calculated from the light it absorbs.
Delian reports both indices for the left and right sides at 40 readings per second.