LIGHT METERS AND LIGHT SENSORS

LI-1400

LI-250

Spectroradiometers

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Light Meters and
Spectroradiometers

LI-COR Sensors

There are two types of sensors : terrestrial and underwater radiation sensors.

Terrestrial Radiation Sensors

• The LI-190SA Quantum Sensor is used by plant scientists, horticulturists, and other environmental scientists to accurately measure the Photosynthetic Photon Flux Density (PPFD)-the preferred measurement of PAR) in natural sunlight, under plant canopies and in growth chambers and greenhouses.
• The LI-191SA Quantum Sensor averages PPFD over its one meter length, eliminating the need to average readings from numerous small diameter sensors. Plant canopy studies of many plots can quickly and easily be done by one person using the LI-191SA.
• The LI-200SA Pyranometer Sensor measures global solar radiation (sun plus sky). It is used in meteorological studies, passive solar system analysis, irrigation scheduling, hydrologic studies, and many other environmental studies.
• For lighting studies or architectural modelling, the LI-250 and LI-210SA Photometric Sensor provide a direct readout of illuminance in lux. The LI-210SA measures visible radiation and has a spectral response curve equal to that for the average human eye. This curve is known as the CIE Standard Observer Curve and is matched by the LI-210SA to within 5% under most light sources.

Underwater Radiation Sensors

• The LI-192SA Underwater Quantum Sensor accurately measures underwater or atmospheric PPFD. It is cosine corrected and features corrosion resistant, rugged construction for use in saltwater and pressures up to 800 psi.
• The LI-193SA Spherical Quantum Sensor gives an added dimension to underwater PAR measurements by measuring photon flux from all directions (Photosynthetic photon Flux Fluence Rate). This is important for underwater plants that utilize radiation from all directions for photosynthesis. The LI-193SA features a highly sensitive optical design and compact, rugged construction (500psi) for use in harsh aquatic environments.
• The Spherical Micro Quantum Sensor WALUS-SQS-I is designed for assessment of the photosynthetically active radiation (PAR). It consists of a 3 mm diameter highly scattering plastic sphere (Optical unit) which accepts light from all sides and which on the top side is connected to a 1 mm diameter plastic fiber which carries the light via an SMA-fiber connector to a separate Detector unit. A blue enhanced silicon photodiode is used as detector in conjunction with a special filterset selecting the photosynthetically active radiation between 380 nm and 710 nm.

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