Light-emitting diodes (LED) and photodiode light sensor packages have been used as force transducers. Such sensors often work on the principle of light occlusion in response to an applied force. A force sensing element or material is placed in the path of the LED and photodiode. The amount of light that passes through to the photodiode is dependent on the applied force.
Fiber optics have also been used in conjunction with LEDs and photodiodes. Pressure to the fiber causes a distortion and leakage of the light and a resulting attenuation. The variation in light transmission can be related to the applied force.
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Support for the development of this module was provided by the National Science Foundation and The Cooper Union for the Advancement of Science and Art.
Please send questions or comments to Professor Ron Adrezin or Professor Daniel Raichel.