Abstract:

This video introduces and demonstrates a G UVA-S12 SD ultraviolet (UV) photodiode module, which features a non-silicon UV-sensitive photodiode and an integrated amplifier providing an analog voltage output. The presenter sets up the module with a battery and voltage regulator for portability and tests its response to various light sources. Experiments show a clear voltage response to UV flashlights, high-power UV lamps (395nm and 365nm), and a UV cure lamp, while showing no response to a standard white LED flashlight. A key finding is the surprisingly high UV output detected from natural sunlight outdoors, prompting the presenter to acknowledge the sun's intensity. The module is presented as a valuable educational tool for understanding and monitoring environmental UV levels, and for practical applications like assessing the need for sunscreen.

Exploring UV Radiation with a Photodiode Module

• 0:00 Introducing the G UVA-S12 SD Module: The video features a compact ultraviolet (UV) photodiode module with an integrated amplifier, specifically the G UVA-S12 SD, noting its non-silicon UV-sensitive material and analog voltage output.
• 0:50 Setting Up for Portable UV Measurement: The presenter plans to power the module with a 10V battery and a 785 voltage regulator (producing 5V) to create a portable device capable of measuring outdoor UV.
• 1:10 Benchtop Functionality and UV Sensitivity: After assembly, the module initially shows 0V. Shining a UV flashlight on it demonstrates a clear response, with the output rising to 0.4V.
• 2:13 UV Specificity Confirmed: Testing with a regular white LED flashlight yields no voltage output, confirming the module's specific sensitivity to UV radiation and its ability to distinguish it from visible light.
• 2:38 High-Power UV Sources and Safety: Experiments with strong UV lamps (395nm and 365nm) cause the module's output to spike significantly (over 3V), prompting a strong warning about the dangers of short-wavelength UV to eyes and skin.
• 3:17 UV Cure Lamp Response: A UV cure lamp (around 400nm) registers approximately 0.3V, providing another reference point for UV intensity.
• 3:48 Surprising Outdoor UV Levels: Taking the device outside on a sunny day in California, the module shows a remarkably high UV reading from natural sunlight, indicating a strong natural UV presence.
• 4:10 Educational and Practical Applications: The module is presented as an insightful tool for personal education about ambient UV levels and for practical uses, such as determining when to wear sunscreen or simply monitoring one's exposure to UV.