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Team members:

• Jeremiah Anderson
• Ryan Schnell
• Michael Weimer
• Mike Wong

For the senior design project we will be building a device that will be capable of "listening" to vibrations on a flexible medium by means of a reflected laser signal, such as a window driven by pressure variations due to sound. The device will operate using the same principal as Alexander Graham Bell's "Photophone", in which sunlight reflected off of a Mylar diaphragm to send a voice over a beam of light. The major difference is that we will provide the light source, and thereby be able to control many more factors. Also, this project will incorporate a very scalable modular design that allows for:

• Analog filtering of incoming laser signal
• Digital filtering of incoming laser signal
• Analog Storage of processed signal
• Digital Storage of processed signal
• Analog Playback of real-time or stored data

Using the reflective properties of either a mirror, or a glass window, we hope to reflect a laser from a source, and receive a reflection from the window. By measuring minute variations in the window, we hope to reconstruct the pressure difference (i.e., sound) that caused such tremors on the window, thereby being able to "listen" to what is going on near the window.