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Fabrication of Flexible Image Sensor Based on Lateral NIPIN Phototransistors

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Integrated Circuit Angular Displacement Sensor with On-chip Pinhole Aperture.

Udumbara Wijesinghe¹, Akash Neel Dey², Andrew Marshall²

¹Department of Materials Science & Engineering, the University of Texas at Dallas, Richardson, TX 75080, USA.

Sensors (Basel, Switzerland)

|March 28, 2020

Summary

This study presents a novel silicon integrated circuit sensor for tracking angular displacement using a light-emitting diode (LED) tag. The sensor offers a simple, compact design with no external optics, enabling precise motion tracking.

Keywords:

angular sensor displacement sensor motion tracking position sensor position-sensitive detector

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Area of Science:

* Integrated Circuit Design
* Optoelectronics
* Sensor Technology

Background:

* Remote displacement tracking is crucial for applications like robotic control and motion capture.
* Existing sensors often require complex external optics, increasing system size and weight.

Purpose of the Study:

* To introduce a simple, small silicon integrated circuit sensor for tracking angular displacement.
* To demonstrate a novel angular transduction mechanism based on differential photoelectron diffusion.
* To present prototype sensor characteristics and performance.

Main Methods:

* Development of a new angular transduction mechanism utilizing differential diffusion of photoelectrons.
* Integration of a pinhole aperture on the sensor chip, eliminating the need for external focusing optics.
* Fabrication of prototype silicon integrated circuit sensors.

Main Results:

* The sensor transduces angular displacement of an LED into normalized differential photocathode currents.
* A linear relationship was observed between the signal and LED angular position across a ± 40° field-of-view.
* The sensor design simplifies system complexity, size, and weight.

Conclusions:

* The developed silicon integrated circuit sensor offers a promising solution for remote angular displacement tracking.
* The novel transduction mechanism and integrated pinhole design provide performance and ease-of-use benefits.
* This technology has potential applications in robotics, motion capture, and other fields requiring precise motion sensing.