Solid state LEDs are used as light sources in a photoacoustic continuous wave experimental set-up. It is shown that their typical relatively high power and narrow emission spectrum in the VIS-near IR range, together with the low cost of such devices, yield performances comparable to those obtained with commercial low-power lasers. Since the modulation of light pulses is accomplished by simply feeding the LED with a square wave, a wide range of chopping frequencies is obtained. Test measurements are reported, showing the good results obtained.
Use of LEDs as light sources in photoacoustic CW spectroscopy / G., Rivera; Viappiani, Cristiano. - In: MEASUREMENT SCIENCE & TECHNOLOGY. - ISSN 0957-0233. - 1:11(1990), pp. 1257-1259. [10.1088/0957-0233/1/11/022]
Use of LEDs as light sources in photoacoustic CW spectroscopy
VIAPPIANI, Cristiano
1990-01-01
Abstract
Solid state LEDs are used as light sources in a photoacoustic continuous wave experimental set-up. It is shown that their typical relatively high power and narrow emission spectrum in the VIS-near IR range, together with the low cost of such devices, yield performances comparable to those obtained with commercial low-power lasers. Since the modulation of light pulses is accomplished by simply feeding the LED with a square wave, a wide range of chopping frequencies is obtained. Test measurements are reported, showing the good results obtained.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
