Development of multireflection absorption spectroscopy device using ultraviolet LEDs

作者：Fukuchi Tetsuo; Shiina Tatsuo

来源：Electronics and Communications in Japan, 2012, 95(12): 62-68.

DOI：10.1002/ecj.11419

• light-emitting diode
• ultraviolet absorption spectroscopy
• gas constituent measurement
• multireflection cell
• sulfur dioxide

An ultraviolet absorption spectroscopy device using light-emitting diodes (LEDs) as the light source was constructed. The measurement cell, light source, and transmitting and receiving optics were installed on a breadboard measuring 30 x 30 cm. A measurement optical path length of 1 m was made possible by multireflection optics. The device can mount two LEDs in tandem, and the transmitted light is coupled to an optical fiber, which is connected to a compact spectrometer. Two LEDs with center wavelengths of 280 and 295 nm were used to provide an emission spectrum which covered the peak region of the absorption spectrum of SO2 . Experiments confirmed the linearity of the absorption coefficient measured by the device for SO2 concentrations in the range of 16 to 800 ppm.

• 出版日期2012-12