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JetSetter Light Glasses
Jae Kwon, Young Lee, Kunal Shah, Alejandro Valencia
Department of Mechanical and Aerospace Engineering at University of California San Diego
Sponsored Project Winter 2013
Background
Travelers experience jet lag when traveling across time zones. Jet lag is a consequence of the body’s internal circadian clock being un-synchronized from the environmental daily cycle. The body gradually adjusts to the new time zone through exposure to ambient light and time synced activities, such as sleeping and eating. This adjustment can take up to a few days for some people and significantly affect their travel quality, whether on business or pleasure.
It is possible to start re-setting the body’s clock during the course of the travel through well-timed light exposure and behavioral modifications aimed at synchronizing the body to the destination’s time zone. We are proposing to achieve this goal through light controlling glasses.The glasses will need to block blue light at set times and activate blue LED to indirectly shine at other times.
Objectives
The main objective of this project is to build a wearable glasses that can emit and block blue light at appropriate times to reset the user's circadian rhythm. The electronics would be able to power the LEDs and the active filter material, as well as give them instructions to when to turn on and off . A user interface has to be developed so that via Bluetooth communication, the user will be allowed to input the current time zone and the destination time zone through personal cell phone or computer. Since the LEDs will be shining directly on the eyes, safety tests have to be conducted in order to verify that the product meets the light safety requirement given by ISO 15004-2.
Here are the Functional Requirements
Final Design
The frame was designed to encase all of the functional components of the device while being reasonably sized, lightweight, comfortable, and aesthetically futuristic. The final design packages the Microprocessor, Bluetooth chip, two CR2450 batteries, four blue light LEDs, and the filter system with internal electrical wiring.
Final Design
Wire Schematics
Exploded View
An Arduino Pro Mini and a Bluetooth Serial chip are packaged in the right side of the frame. These serve as the communication and processor system that allow the user to interface with and control the device. Currently the voltage converter sits behind the head of the user, however, future iterations will have the processor, Bluetooth, and converter consolidated on one PCB
Light Controller
Internal Circuit
Packaged Electronics
To simulate day time, blue light must be added to the user's field of vision with a irradiance of at least 12.1 W/cm^2. to achieve this an array of surface mount (SMD) LEDs were placed on the upper portion of the frame. Light flows through a diffuser to evenly spread the light over the face of the user.
To simulate night time, blue light must be blocked form the user's fields of vision, achieve this a multi layer filter was designed. In the lenses area of the device a filter made from polymer dispersed liquid crystal (PDLC) film and two layers of the blue light blocking optical filter. The goal was to stop blue light from being transmitted as well as show how the active filter material would function. Additionally, the combination of the layers created a more rigid structure that could be inserted into the frame without more reinforcement.
Diagram of Filter
Transmission Function of 2 LBL Filters
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