GlowTact

GlowTact

Simple and Compact Vision-Based Tactile Sensing with High Sensitivity and Spatial Resolution

Yuxiang Ma*, Megha Tippur*, Pengfei Ye, Sandra Q. Liu, Haonan Chen, Francis Richard Cottrell, Edward Adelson

Massachusetts Institute of Technology and Harvard University. *Equal contribution.

Paper PDF Code soon Hardware guide soon
Paper teaser showing robotic hands using black GlowTact fingertips to contact screws, with corresponding tactile camera images
Fig. 1 Contact turns dark in the raw tactile image.

How it works

Pressure closes the air gap, the membrane couples to the gel, and the contact turns dark in the camera image.

Membrane–gel interface

Schematic
GlowTact device-scale optical coupling diagram A black membrane deforms toward a near-flat, approximately 9 UM microtextured clear-gel interface as qualitative pressure increases. A centered camera and field of view magnify the interface into a qualitative, approximately 100 UM local window.

Asperity coupling

Two-dimensional microscopic coupling view A qualitative side section of an approximately 100 um local window, showing a black membrane approaching spatially distributed asperities and closing local air gaps.
HEIGHT EXAGGERATED
Coupled area in ~100 µm 24%

Camera response

Simulated
Local intensity No signal

Why it’s simple

GlowTact needs only single-color light, a monochrome camera and an uncoated medical-grade nitrile membrane: no photometric stereo, no markers, no calibration.

Three form factors

What GlowTact measures

  1. Light touch
  2. Geometry
  3. Shear

A 0.2 g screw shows under its own weight

Passive contact
M&M, 1.0 g (9.8 mN); M2 screw, 0.2 g (1.96 mN).
Controlled threshold
120 mN median at SNR = 3, 10 probes.

Fine contact geometry down to M1 threads

0.25 mm pitch, from a single frame.

Photograph of the five set screws, M3 down to M1, on green tape GlowTact tactile image of five set screw threads, M3 down to M1
Photograph of the Phillips screw head GlowTact tactile image of a Phillips screw head
Photograph of the steel calibration ball array GlowTact tactile image of a calibration ball array
Photograph of the Oreo biscuit GlowTact tactile image of embossed biscuit lettering

Shear from the gel’s own speckle

No markers; usable over 97.8 % of the surface.

A fingertip on the flat sensor
A CR2025 coin cell
An M5 Phillips-head screw, head up

Straight from the camera

Paper and citation

arXiv:2609.32471 PDF 

@article{ma2026glowtact,
  title = {GlowTact: Simple and
    Compact Vision-Based
    Tactile Sensing with High
    Sensitivity and Spatial
    Resolution},
  author = {Ma, Yuxiang and
    Tippur, Megha and
    Ye, Pengfei and
    Liu, Sandra Q. and
    Chen, Haonan and
    Cottrell, Francis Richard
    and Adelson, Edward},
  journal = {arXiv preprint
    arXiv:2609.32471},
  year = {2026}
}