Detailed explanation of the working principle of photosynthesis tester
The so-called photosynthesis is simply a process in which green plants convert carbon dioxide and water into energy-storage organic matter under the irradiation of light, and release oxygen. It is an important factor affecting plant growth! In agriculture, measuring the photosynthesis of crops through a photosynthesis meter can help us understand crops clearly and promote better photosynthesis of crops. While reducing the amount of fertilizer used, it can also promote crop growth and increase crop yield. Let's take a look at the working principle of the photosynthesis meter.
Working principle of photosynthesis tester
1.CO2 measurement
The photosynthesis tester adopts the gas exchange principle, uses the infrared gas analyzer to measure the concentration changes of CO2 and H2O before and after passing through the leaves, analyzes the gas exchange between the leaves and the environment, and uses the fixed amount of CO2 to characterize the photosynthetic capacity. Put the plant leaves into the chamber during use, and photosynthesis will consume CO2. By measuring the CO2 concentration difference between the inlet and outlet of the leaf chamber under light conditions, the net photosynthetic rate can be calculated according to the leaf area.

2.Principle of temperature measurement
The temperature sensor uses high-precision sensor, and the temperature measurement circuit uses three-wire system classic constant current source temperature measurement circuit.

3.Photosynthetic effective radiation measurement
Photosynthetically active radiation (PAR) refers to the spectral components of solar radiation that plants absorb and participate in photochemical reactions- The general spectral range is mostly 400~760 nm. The principle of this technology is that the PAR measurement adopts multi-layer superposition light filter and photosensitive semiconducting technology, that is, silicon photodiode, which uses photogenerated voltage to convert light energy into electrical energy. Under the illumination, photogenerated electromotive force can be formed between the P and N regions. When the PN junction is connected, there will be current flowing through the circuit, and the current is correlated with the light intensity of Lantau.
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