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The difference between illuminance sensor and photosynthetically active radiation sensor

by:Rika Sensors     2021-12-10
The difference between illuminance sensor and photosynthetically active radiation sensor
In the research of plant physiology, the determination of photosynthesis of plants is one of the important research work. Generally, it is determined by measuring the value of illuminance and photosynthetically active radiation, and measuring illuminance and photosynthetically active radiation requires an illuminance sensor and a photosynthetically active radiation sensor.

To understand the difference between the illuminance sensor and the photosynthetically active radiation sensor, we need to start to understand the illuminance and photosynthetically active radiation.

Illuminance is abbreviated as illuminance, which generally refers to the areal density of luminous flux on the light-receiving surface of plants, that is, the luminous flux per unit area. Therefore, the illuminance is a quantity that indicates the degree of illumination of the light-receiving surface, and the unit is Lux. It is a unit based on the perception of the human eye. Since the human eye has different light sensitivity to different wavelengths, the same light quantum flux density of 1000μE/m2/s, the more sensitive green light lux of the human eye is greater, and the less sensitive red light lux of the human eye will be smaller. Under certain conditions, when the light intensity increases, the intensity of photosynthesis will also increase, but when the light intensity exceeds the limit, the stomata of the plant leaves will be closed and the intensity of photosynthesis will decrease. Therefore, the use of illuminance sensors to control illuminance has become an important factor affecting crop yields.

Photosynthetically active radiation is an important environmental element in plant growth. In the research of facility agriculture or horticulture, the light intensity and light duration should be determined according to the plant variety and its growth period. For example, plants usually require more and more intense light during the vegetative and reproductive growth phases than during the seed-setting and harvesting phases. Therefore, in facility agriculture or horticulture, reasonable regulation of photosynthetically active radiation can not only effectively save light and electricity, but also promote the increase in yield.

Because the main test range of photosynthetically active radiation is 400 to 700nm, the different spectral modes of lamps will affect the relationship between light intensity and photosynthetically active radiation. Therefore, their rough relationship is: 1000 lux u003d ~19.53 μE/m2/s PAR (1μE/m2/s PAR u003d ~50 lux).

Knowing the relationship between illuminance and photosynthetically active radiation, it is not difficult for us to see the difference between the illuminance sensor and the photosynthetically active radiation sensor.

1. Different output numerical measurement units

The illuminance sensor can convert the illuminance into an electrical signal, and the output numerical measurement unit is LUX. The photosynthetically active radiation sensor adopts the photoelectric sensing principle, and the output value measurement unit is 0~2500μmol/㎡·s.

Two, the measurement range is different

The measurement range of the illuminance sensor is 0~60,000 LUX or 0~200,000 LUX. The photosynthetically active radiation refers to the part of solar radiation with a wavelength range of 400 to 700 nm that can photosynthesize vegetation. The measuring range of the photosynthetically active radiation sensor is 0 to 2500 μmol/㎡·s.

3. Different applicable scenarios

The photosynthetically active radiation sensor can only measure the effective radiation amount of plants during photosynthesis, and the illuminance sensor can be used for other needs such as electronic equipment production lines in addition to being used in agricultural occasions. The occasion of illuminance measurement.

Illuminance sensor and photosynthetically active radiation sensor

Illuminance sensor RS-GZ*-*-2 is a high-precision photosensitive transmitter, the output value measurement unit is Lux, the equipment adopts wall-mounted waterproof housing, wall-mounted Installation, high protection level. The product power supply is 10-30V wide voltage power supply, which can be used in agricultural greenhouses, flower cultivation greenhouses, agricultural fields, electronic equipment production lines and other occasions that require illumination monitoring.

The photosynthetically active radiation sensor RS-GH-N01-AL adopts the photoelectric sensing principle and can be used to measure the photosynthetically active radiation in the spectral range of 400~700nm. The sensor uses high-precision photoelectric sensing elements, broad spectrum absorption, high absorption in the range of 400-700nm, and good stability; when there is light, a voltage signal proportional to the intensity of the incident radiation is generated, and its sensitivity is proportional to that of the incident light. The cosine of the direct angle is proportional. The dust cover adopts special treatment to reduce dust adsorption, effectively prevent the interference of environmental factors on internal components, and can measure the effective radiation of photosynthesis.

The product adopts the standard Modbus-RTU 485 communication protocol, which can directly read the current photosynthetic effective radiation value, and the wiring method is simple. The appearance is small and beautiful, and it takes up little installation space. Products are widely used in research in meteorology, agriculture, air pollution and other fields.

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