1973
DOI: 10.1080/00032717308058708
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Light Emitting Diodes and Phototransistors in Photometric Modules

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Cited by 61 publications
(37 citation statements)
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“…Compared to conventional incandescent and discharge lamps, they feature low power consumption and high efficiency, high stability and long life times, but also relatively narrow emission bands of typically about 30 nm width. These widths are well matched to the absorption bands of molecules and, as Flaschka et al [1] demonstrated already in 1973 with early red LEDs, the construction of very simple but powerful instruments and detectors is possible by combination of the LEDs with inexpensive solid state photodetectors. Monochromators are not needed as the wavelength selectivity is inherent to the radiation sources.…”
Section: Introductionmentioning
confidence: 83%
“…Compared to conventional incandescent and discharge lamps, they feature low power consumption and high efficiency, high stability and long life times, but also relatively narrow emission bands of typically about 30 nm width. These widths are well matched to the absorption bands of molecules and, as Flaschka et al [1] demonstrated already in 1973 with early red LEDs, the construction of very simple but powerful instruments and detectors is possible by combination of the LEDs with inexpensive solid state photodetectors. Monochromators are not needed as the wavelength selectivity is inherent to the radiation sources.…”
Section: Introductionmentioning
confidence: 83%
“…LED 2 was coupled to an operational amplifier (A 1 ) to work as a photodetector. The signal S 0 (mV) at the operational amplifier (A 2 ) output presented a closed relationship with the intensity of the radiation beam emitted by LED 1 . The generate signal (S 0 ) was monitored by a microcomputer through the analog input of a PCL711S interface card.…”
Section: Apparatusmentioning
confidence: 99%
“…The light emitting diode (LED) was utilized for the first time as a radiation source for photometric detection by Flaschka et al 1 35 years ago, and afterwards by D. Betteridge et al 2 After these pioneer studies, the use of LEDs with an analytical purpose increased continuously, and today we can see that several analytical procedures employing LED as a radiation source have been published. [3][4][5][6] Small size, low cost, high stability of the radiation beam, and long lifetime are the main features of LEDs which explains its widespread use in different analytical procedures.…”
Section: Introductionmentioning
confidence: 99%
“…No fim da década de oitenta, foi proposto o emprego de válvulas solenóides de 3 vias para manipular amostras e soluções de reagentes em sistema FIA (MALCOLME-LAWES; PASQUINI, 1988). Até a metade da década de noventa, a bomba peristáltica era, praticamente, o único dispositivo utilizado para bombear as soluções em sistemas FIA, quando foi proposto o emprego de mini-bombas solenóide (LAPA et al, 2002 1973;BETTERIDGE et al, 1978). Desde então, tem proporcionado muitas vantagens, especialmente para espectrofotometria de absorção molecular UV-VIS (BETTERIDGE et al, 1978;RAIMUNDO, 1984;SILVA et al, 2005;SILVA et al, 2009 Neste sentido, diversos grupos de pesquisas têm se dedicado ao desenvolvimento de protótipos de equipamentos que, em muitos casos, apresentam desempenho compatível aos fotômetros comerciais (DASGUPTA et al, 2003;FONSECA;RAIMUNDO, 2004).…”
Section: Agradecimentosunclassified
“…Até a metade da década de noventa, a bomba peristáltica era, praticamente, o único dispositivo utilizado para bombear as soluções em sistemas FIA, quando foi proposto o emprego de mini-bombas solenóide (LAPA et al, 2002). 1973;BETTERIDGE et al, 1978). Desde então, tem proporcionado muitas vantagens, especialmente para espectrofotometria de absorção molecular UV-VIS (BETTERIDGE et al, 1978;RAIMUNDO, 1984;SILVA et al, 2005;SILVA et al, 2009 Valor máximo permitido.…”
Section: Dados Internacionais De Catalogação Na Publicação (Cip)unclassified