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Enabling better global research outcomes in soil, plant & environmental monitoring.

LS-C Mini Quantum Sensor

The Mini Quantum Sensor LS-C is a miniaturised and flat sensor that can be placed close to leaves in small spaces, for example within cuvettes. The LS-C measures photosynthetically active radiation (PAR).

The LS-C is well suited for light incident perpendicular to the surface between -30° and +30°. For a completely cosine-corrected sensor, see MQS-B.

Design: Small versatile waterproof mini quantum sensor for selective PAR measurement, cosine corrected for light incident at an angle between -30° to +30° from surface normal for PPFD (photosynthetic photon flux density) measurement, with base plate for screw connection.
Sensor housing: Black plastic
Diffuser material: Perspex
Signal detection: High stability silicon photovoltaic detector with filter set for PAR correction (see “General Features” for typical sensitivity)
Signal output: Typically- 10 μA / (1000 μmol m-2 s-1)
Temperature coefficient of photodiode: 0.01 %/K
Absolute calibration: ± 10%
Immersion coefficient: Typically 1.15
Angular dependence: Error < 3% for angle between -30° and +30° from normal axis (see details for typical response)
Operating temperature: – 5°C to + 45°C
Cable length: 3 m
Connector: BNC
Size: Base plate: 12 mm x 7 mm x 1 mm (H x W x L); sensor housing 5 mm x 7.5 mm x 7 mm (H x W x L); diffuser diameter: 3 mm
Weight: 26 g

Spectral Response

LS-C Fig1

Fig. 1 Typical response between 350 nm and 750 nm of a LS-C sensor. The solid line shows the ideal response of a photon flux sensor for photosynthetically active radiation.


LS-C Fig2

For comparison Fig. 2, shows the response to energy flux rate from 350 – 750 nm.

Angular Response

The LS-C sensor uses a plastic diffuser to obtain an angular response error of less than ± 3% (-30 to 30° angle). Fig. 3 shows a typical angular response curve of the LS-C sensor compared to the ideal characteristic.

LS-C Fig3

LS-C Fig4