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Time of issue:2020-04-29 00:00:00
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PAR light quantum sensor-photosynthetic effective

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PAR light quantum sensor-photosynthetic effective

The measurement principle PAR is mainly used to measure photosynthesis effectively, and uses a light quantum sensor. Light plays a vital role in the growth of plants and crops. The absorbed light (mainly by chlorophyll) drives the photosynthesis process, and carbon dioxide and water are converted into glucose and oxygen. This process of using light is called photosynthetically active radiation (PAR). The actual response depends on the plant or crop. A standardized PAR in the visible light spectral response range of 400nm and 700nm, is defined by McCree (1972), the photons in this region are absorbed by the same amount. The relatively short wave of "blue" photons
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Product description
Technical indicators
Measuring principle
 
PAR is mainly used to measure photosynthesis effectively, using light quantum sensor.
 
Light plays a vital role in the growth of plants and crops. The absorbed light (mainly by chlorophyll) drives the photosynthesis process, and carbon dioxide and water are converted into glucose and oxygen. This process of using light is called photosynthetically active radiation (PAR). The actual response depends on the plant or crop. A standardized PAR in the visible light spectral response range of 400 nm and 700 nm was developed by McCree (1972)
By definition, photons in this area are absorbed by the same amount. "Blue" photons have more energy at relatively short wavelengths (high frequencies) than ‘red’ long wavelengths. The amount of photosynthesis effective is usually expressed as photosynthetic photon flux density (PPFD): mole / m2 · s.
 
In horticulture, such as a greenhouse, in order to optimize the timing and quality of crop growth, the intensity of light needs to be controlled. In order to achieve effective monitoring of natural sunlight and artificial lighting in the greenhouse, the use of PAR sensors is necessary. In forestry, PAR is a key research parameter, which is used to measure the effective parameters above, inside and below the forest canopy according to plant physiology and leaf area. In agriculture, PAR measurement helps predict plant growth rate and estimate crop yield.
 
PQS1's PAR optical quantum sensor provides accurate and continuous measurement outdoors. The solid appearance makes it well protected under harsh weather conditions and pesticide spraying.
 
PAR light quantum sensor is designed for continuous outdoor, indoor installation or field portable use. Provides the end user with excellent directional (cosine) response, easy to clean.
 
It is easy to calibrate the level by combining the adjustment screw of the bubble level meter on the fixed flange. The sensor comes with a 5 meter cable, and 15 meters is also available. Equipped with an amplifier, it can provide a standard Adcon analog output signal of 0 to 2.5V.
 

 

Application
 
Crop growth
Photosynthetic potential research
Tourism Ecology
Greenhouse control
Research Institute Experiment / Solar Energy Research
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Technical index
Spectral range: 400~700nm±4nm
Sensitivity: 10~50 μv/μ moL/m2.s
resistance: 240 Ω (typical)
Signal output range (0-3000μ moL / m2.s): 0~30mV/0-2.5V
Run the light: 10000μ moL/m2.s
Response time < 1μS
Instability (change / year) < 2%
Non-linearity (0-10000μmoL / m2.s): < 1%
Directional response (up to 80 ° at 1000 μ moL / m2.s light): < 30μ moL/m2.s
Response temperature -.12%/°C
Vision 180°
Accuracy of bubble level: < 0.2°
Detector type: Photodiode
Operating temperature: -30°C to +70°C
storage temperature: -30°C to +70°C
temperature range: 0-100% non-condensing
Protection level: IP67

 

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