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Portable light-emitting diode-based photometer with one-shot optochemical sensors for measurement in the field
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10.1063/1.3000682
/content/aip/journal/rsi/79/10/10.1063/1.3000682
http://aip.metastore.ingenta.com/content/aip/journal/rsi/79/10/10.1063/1.3000682

Figures

Image of FIG. 1.
FIG. 1.

Functional block diagram of the hand-held photometer.

Image of FIG. 2.
FIG. 2.

Photograph showing the measurement system and several one-shot sensors.

Image of FIG. 3.
FIG. 3.

Schematic of the instrument analog electronics.

Image of FIG. 4.
FIG. 4.

Time drift of the photocurrent generated by a LED stabilized with a constant (dc) current (triangles), a pulsed current bias (1 kHz and 50% of duty cycle) (squares) and with optical feedback (solid line). Data were measured after 160 s of instrument warm-up.

Image of FIG. 5.
FIG. 5.

Screen capture of the microcontroller A/D input with a MSO4104 oscilloscope during photometer operation (1 s switched on LED).

Image of FIG. 6.
FIG. 6.

Sigmoidal calibration functions of potassium (circles) and nitrate (solid squares). Lines represent the fittings to Eq. (5).

Tables

Generic image for table
Table I.

Analytical and technical specifications of the photometer for potassium and nitrate sensors (SD: standard deviation).

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/content/aip/journal/rsi/79/10/10.1063/1.3000682
2008-10-21
2014-04-24
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Portable light-emitting diode-based photometer with one-shot optochemical sensors for measurement in the field
http://aip.metastore.ingenta.com/content/aip/journal/rsi/79/10/10.1063/1.3000682
10.1063/1.3000682
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