Further notes on using digital camera sensors as high density multimodal sensor arrays.
1) Detect loading / strain using a module incorporating a strain sensor (e.g. the resistive type used in scales and strain gauges) to a diode. The diode is coupled to a fiber optic line that takes the signal to the camera.spectrometer.
2) Position sensors. Use an arc of partially clear plastic that has a light at one of the ends at the arc edge. A fiber optic line at the oriented normal to the arc gathers light that takes the signal to the camera. As the joint moves, the plastic arc moves and distance between the light and the fiber optic changes. This change is converted to a position.
For joints with 360 rotation, the arc of plastic is replaced by a disk. The light source is placed at the center, and an opaque radial line gives each position of the disk a different light intensity.
3) Touch sensors. Use my previous idea of an array of sensors embedded in a squishy and translucent layer with one or more light sources. Touch distorts the light path of direct or reflected light between the light source(s) and sensor in reproducible ways. The set of sensors is trained to recognize the pattern of light formed by different touches. The pattern may also be changed by movement of the surface, for example if the array of sensors covers a hand, and could bed used to detect hand position.
4) An array of fibers can be placed to collect light from a spectrometer. An array of spectrometers can be developed using this approach, as the camera can collect light from several 1D fiber optic arrays.