Plant light intensity measurement

Plant light intensity measurement

The light wave of a particular wavelength range used by plants for photosynthesis is called Photosynthetic Active Radiation (PAR), and its unit is micromoles per second per square meter (μmol*m-2s-1), usually called photosynthesis photon. Photonsynthetic Photon Flux Density (PPFD). Its value is an important parameter of the ecosystem function model, crop growth model, net primary productivity model, atmospheric model, biogeochemical model, and ecological model. Measurements can be made by photosynthetic active radiation recorders.

Photosynthetically active radiation has different values ​​at different times. The midsummer sun can reach approximately:

2000 μ E (micro Einsteins, μ Einsteins) = 2000 μmol*m-2 s-1 (photosynthetically active radiation, PAR) = 9800 FC (foot candle light, Footcandle) = 1060 W * m - 2 (bright flow, lm) = 10600 LUX (illuminance, lx ).

When using photosynthetically active radiation recorders, it has a measuring range of 1-2,700 μmol m-2 s-1 (400-700 nm). At the same time, the entire instrument weighs only 140 g, making it easy for workers to carry out operations outdoors. This instrument has three modes of manual, automatic and computer lock, users can set the three modes according to their needs.

Manual mode: The working mode is to store once, and it can record the time and various environmental parameters. You can set the interval time to automatically record, press the stop button to stop at any time. After the data collection is complete, the data can be sent to the computer. The software will automatically generate curve graphs that can be printed and processed. (Host button is valid at any time, can be broken point acquisition).

Automatic mode: set the interval time first, the instrument can automatically record data according to the set interval time. After the data collection is complete, the data can be sent to the computer. The software will automatically generate curve graphs that can be printed and processed.

Computer lock mode: The keys on the host computer all fail (lock key), and are automatically sampled according to the interval time set by the computer to ensure the authenticity and continuity of the data.