LS-C Small Versatile Mini Quantum Sensor from Walz




The LS-C sensor uses a plastic diffuser to obtain an angular response error of less than ± 3% (-30…30 ° angle).

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

Design of sensor: 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 (photosynthetical photon flux density) measurement, with base plate for screw connection.

Sensor housing: Black plastic material

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 chart for typical response)

Operating temperature: - 5 °C … + 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

Fig. 1: Spectral sensitivity of LS-C; blue line with dots: Typical spectral response of the LS-C for photon flux density (PFD); pink line: Ideal response of PAR-sensors


Fig. 2: Spectral sensitivity of LS-C; blue line with dots: Typical spectral response of the LS-C for energy flux density (EFD); pink line: Ideal response for PAR-sensors


Fig. 3: Angular dependence of LS-C; black dots: Typical sensitivity of the LS-C sensor; green line: Ideal cosine response


Fig. 4: Typical error of angular dependence of the LS-C sensor in comparison to an ideal cosine response

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