A SOLAR-POWERED WHITE LED-BASED UV-VIS SPECTROPHOTOMETRIC SYSTEM MANAGED BY PC FOR AIR POLLUTION DETECTION IN FARAWAY AND UNFRIENDLY LOCATIONS

This research work regards the design and realization of an absorption spectrophotometer based on a LED light source in place of the usually employed Xenon lamp. The advantage of the use of LED technology resides in several factors such as the reducing of the analyte temperature variations and thus...

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Bibliographic Details
Published in:International journal on smart sensing and intelligent systems 2017-01, Vol.10 (1), p.1-31
Main Authors: Visconti, P., Primiceri, P., de Fazio, R., Ekuakille, A. Lay
Format: Article
Language:English
Subjects:
Absorption
absorption spectroscopy
Air pollution
Data exchange
Electromagnetic wave filters
Electronic control
Electronic control system
Firmware
LED
Light beams
Light sources
Luminous efficacy
Luminous intensity
measurements and prototype characterization
Microcontrollers
Noise generation
Optical filters
PIC
Pollution detection
Portable equipment
Power consumption
Sensors
Solar energy
Solenoid valves
Spectrophotometry
Stepping motors
Xenon lamps
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Summary:This research work regards the design and realization of an absorption spectrophotometer based on a LED light source in place of the usually employed Xenon lamp. The advantage of the use of LED technology resides in several factors such as the reducing of the analyte temperature variations and thus noise generation, which occur if a Xenon light source is used, beside of the high luminous efficiency, reliability, operating duration, lower maintenance and a lower power consumption. This last factor allows to supply the entire designed apparatus using a solar panel thus making the system easly portable for use even in places where the electricity network is absent. An optical filtering system was realized in order to detect the analyte absorption for each wavelength range selected by the optical filters. A PC-interfaced PIC-based control unit used to manage the different functionalities required by the spectophotometer was realized and tested. The control unit acquires and processes, via the developed firmware, the raw data provided by different sensors employed in the system. The sensors are used to monitor analyte temperature and humidity values, to control the analyte pressure and to acquire the luminous intensity value of the light beam before and after passing through the analyte. Finally, the realized electronic control unit actuates different mechanical sections (stepper motor, solenoid valve), sincronyzing and controlling the data exchange between hardware sections, microcontroller and the PC.
ISSN:1178-5608
1178-5608
DOI:10.21307/ijssis-2017-201