An inexpensive, portable and microcontrolled near infrared LED-photometer for screening analysis of gasoline
详细信息 查看全文
- 作者：Edvaldo da Nó ; brega Gaiã ; o ; Sé ; rgio Ricardo Bezerra dos Santos ; Vagner Bezerra dos Santos ; Elaine Cristina Lima do Nascimento ; Renato Sousa Lima ; Má ; rio Cé ; sar Ugulino de Araú
- 关键词：Near infrared ; Light emitting diode ; Photometer ; Microcontroller ; Screening analysis ; Gasoline
- 刊名：Talanta
- 出版年：2008
- 出版时间：15 May 2008
- 年：2008
- 卷：75
- 期：3
- 页码：792-796
- 全文大小：454 K
文摘
A microcontrolled, portable and inexpensive photometer is proposed. It uses a near infrared light emitting diode (NIR LED) as radiation source, a PbSe photoresistor as infrared detector and a programmable interrupt controller (PIC) microcontroller as control unit. The detector system presents a thermoresistor and a thermoelectric cooling to control the detector temperature and keep the noise at low levels. The microcontroller incorporated total autonomy on the proposed photometer. As its components are inexpensive and of easy acquisition, the proposed NIR LED-photometer is an economical alternative for chemical analyses in small routine, research and/or teaching laboratories. By being portable and microcontrolled, it also allows carrying out field chemical analyses. The instrument was successfully applied on the screening analysis to verify adulteration in gasoline samples.