A low-cost optical sensing device based on paired emitter-detector light emitting diodes

被引：76

作者：

Lau, KT ^{[1
]}

Baldwin, S

O'Toole, M

Shepherd, R

Yerazunis, WJ

Izuo, S

Ueyama, S

Diamond, D

机构：

[1] Dublin City Univ, Sch Chem Sci, Natl Ctr Sensor Res, Adapt Sensors Grp, Dublin 9, Ireland

[2] Mitsubishi Elect Res Labs, Cambridge, MA 02139 USA

[3] Mitsubishi Electr Corp, Adv R&D Ctr, Amagasaki, Hyogo 6618661, Japan

来源：

ANALYTICA CHIMICA ACTA | 2006年 / 557卷 / 1-2期

关键词：

light emitting diode; photodiode; colorimetry; optical sensor; sensor networks;

D O I：

10.1016/j.aca.2005.10.046

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

A low-power, high sensitivity, very low-cost light emitting diode (LED)-based device for intensity-based light measurements is described. In this approach, a reverse-biased LED functioning as a photodiode is coupled with a second LED configured in conventional emission mode. A simple timer circuit measures how long (in microsecond) it takes for the photocurrent generated on the detector LED to discharge its capacitance from logic 1 (+5 V) to logic 0 (+1.7 V). The entire instrument provides an inherently digital output of light intensity measurements for a few cents. This light intensity dependent discharge process has been applied to measuring concentrations of coloured solutions and a mathematical model developed based on the Beer-Lambert Law. (c) 2005 Published by Elsevier B.V.

引用

页码：111 / 116

页数：6

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