Constant Optical Power Operation of an Ultraviolet LED Controlled by a Smartphone
| Autor: | Jia-Jun Zhang, Pinghui S. Yeh, Yu-Chia Chang, Chang-Han Wang, Ching-Hua Chen |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Transimpedance amplifier
Computer science Ultraviolet Rays light-emitting diodes UV sensors TP1-1185 02 engineering and technology Color temperature LED circuit 01 natural sciences Biochemistry Analytical Chemistry law.invention Bluetooth law monitoring photodiodes Arduino 0103 physical sciences Electrical and Electronic Engineering Instrumentation Lighting 010302 applied physics business.industry Chemical technology Communication Electrical engineering 021001 nanoscience & nanotechnology Atomic and Molecular Physics and Optics Photodiode Disinfection Smartphone 0210 nano-technology business App Remote control Light-emitting diode |
| Zdroj: | Sensors (Basel, Switzerland) Sensors, Vol 21, Iss 4707, p 4707 (2021) |
| ISSN: | 1424-8220 |
| Popis: | Constant light power operation of an ultraviolet (UV) LED based on portable low-cost instrumentation and a monolithically integrated monitoring photodiode (MPD) has been reported for the first time. UV light irradiation has become one of the essential measures for disinfection and sterilization. Monitoring and maintaining a specified light power level is important to meet the criteria of sterilization. We built a module composed of a monolithically integrated UV LED and MPD, a transimpedance amplifier, an Arduino Uno card, a digital-to-analog converter and a Bluetooth transceiver. An Android App that we wrote remotely controlled the UV LED module via Bluetooth. The Arduino Uno card was programmed to receive demands from the smartphone, sent a driving voltage to the LED and returned the present MPD voltage to the smartphone. A feedback loop was used to adjust the LED voltage for maintaining a constant light output. We successfully demonstrated the functioning of remote control of the App, and the resultant UV LED measured power remained the same as the setting power. This setup can also be applied to visible or white LEDs for controlling/maintaining mixed light’s chromaticity coordinates or color temperature. With such controlling and internet capability, custom profiling and maintenance of precision lighting remotely would be possible. |
| Databáze: | OpenAIRE |
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