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Proximity sensors

Posted: 29 Apr 2009 ?? ?Print Version ?Bookmark and Share

Keywords:proximity sensor? light sensor? design mechanical?

As ambient light sensors play an increasingly important role in our lives, proximity sensing becomes a simple and inexpensive companion that enables a wide range of the applications to make our daily life easier.

Proximity sensing based on infrared signal detection requires two parts: infrared LED and infrared sensor. The intensity of captured infrared signal changes accordingly when an sensing object is getting closer or moving, the captured infrared signal is processed in real time through light to digital conversion to reveal the distance or even the motion of sensing object.

There are many design considerations to deal with the implementation complexities of infrared signal based proximity sensing solution. These involve mechanical design that includes component selections, component placement dimensions, glass cover characteristics, optical design and overall system design to achieve an optimal proximity sensing solution.

This application notes mainly cover mechanical design that is a critical component of the overall proximity sensing system solution. It involves LED selection, isolation techniques between sensor and LED, component placement dimensions and glass cover characteristics etc. The proximity sensing readout comparison based upon different design variations and trade-offs is used to decide optimal choice for different application and system requirement.

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