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

LINPAR Linear PAR Sensor

The LINPAR Linear PAR Sensor is designed for long term monitoring of canopy light interception. LINPAR consists of 33 individual PAR sensors along a 1m length wand. PAR readings are averaged across all 33 sensors to give a single output value.

LINPAR is ideally supported by the LSM1 Light Sensor Meter for PAR Sensors in combination with the QSO-S PAR Sensor or SQ-110 PAR Sensor. Up to 9 x LINPAR sensors can be connected to the LSM1 Light Sensor to measure light within and beneath the canopy and either the QSO-S or SQ-110 is installed above the canopy to measure ambient light. The data can then be converted to leaf area index or fraction of absorbed radiation.

Materials Anodised Aluminium, Acrylic. IP65 sealed
Cable 5m Enhanced polyethylene screened twin 18 x 0.1mm
Sensor 33, GaAsP Photodiodes. 350 – 680nm. Peak at 640 nm
Sensitivity 1 mV/10 µmol / m2 / s (V version)
Temperature Sensitivity ± 0.15% °C at peak response, from 0 – 50°C
Linearity 1% over 0 – 2000 µmol/m2/s
Uniformity of Sensing Surface Better than 2% over 0.85 sensing length
Response Time 2µs. 10 – 90%
Output V version (Voltage Version): 200mV/2,000 µmol/m2/s
A version (Current Version): ~1.8 µA/2,000 µmol/m2/s
Operating Temperature Range -20°C – +50°C
Cable Connections Blue … 0
Clear … + Screen.
Uncoated wire connected to plastic screen
Dimensions 1.2 cm x 1.5 cm x 1m
Materials Anodised aluminium and acrylic

The sensors are covered with a 3mm diffuser providing an integrated reading over 850mm section of the sensor. At the cable end there are no sensors in the first 70mm and in the last 50mm at the distal end to provide for attachment. An integral “bulls eye” levelling sensor is provided.

For complete canopy monitoring solutions the LSM-LINPAR can be used with the SFM1 Sap Flow Meter, PSY1 Psychrometer and a Dendrometer.

  • The LINPAR is ideally suited to be connected to the Light Sensor Meter (LSM)
  • The LSM can support up to 10 LINPAR sensors for complete canopy light characterisation
  • Variables calculated include PAR, leaf area index, sunflecks, and canopy extinction co-efficient