Introduction: Build Your Own Portable Polariscope
Step by step instructions for building your own device to look for polarization in materials, we use this for testing optical elements and but it's also commonly used by gemologists.
-An old display such as a cell phone LCD
-Powered USB port (3-5 V)
-Polarized film or 1/4 wave film (can be cut from an old cell phone or laptop)
Step 1: Obtain a Display Screen
You can use a new LCD screen or remove one from an old cell phone.
Step 2: Power the Display Screen
Find the leads that power the screen backlight and solder a USB cable to the leads. Plug the other side of the cable into a 3-5 V powered USB port.
Step 3: Obtain a Polarized Film
You can cut the polarized film from an old cell phone, laptop, or any LCD display or purchase a 1/4 wave film from
Step 4: Purchase Magnifier
Walmart sells one similar to the one we used
Step 5: Assemble Film, Screen and Magnifier
Place the polarizing film above the magnifying lens and the cell phone screen below the lens. Try assembling without the polarizer film to see the light blocking effect of the polarizer.
Step 6: Test Your Setup
You can use a thin film strip to test the setup by sliding it under the magnifier. Note the color changes as the pressure is altered.