LAI sensor MIJ-15LAI TypeII/K2 : gives you Absolute LAI result
- The world's only sensor that adopted the relationship that the spectral ratio of PAR and IR correlates with Leaf Area Index (LAI).
- Regardless of cloudy weather, fine weather, instantaneous LAI measurement on the spot has been completed.
- Capable of Absolute LAI measurement Result
- No PAI (Plant Area Index) counting so avoiding influences from dead leaves, branches, trunks remain.
- MIJ-15 LAI/K2 can continuously and automatically observe LAI value changes over time. (Data logger must use)
- Two choice from below type
/K2 stands for fixed – point observation
/P stands for portable handheld measurement
General LAI Meters
Measurements of Leaf Area Index (LAI) divided into two types direct and estimating measurements. Direct measurement is by reaping or leaf litter trap. By estimating leaf volume and light decay based on optical estimation by using hemispherical photograph is the estimating measurement. These measurement will not give you absolute LAI result and also you are spending time to visiting the site.
To save your time just leave MIJ-15 LAI/K2 under canopy for about a year, you can check the seasonal change of LAI.
The best feature of our LAI sensor is that you can measure the seasonal change of LAI without visiting field.
Disadvantage of general Plant Canopy analyzer
To see the LAI results, we will need to have two plant Canopy analyzers; this is because LAI result must need to compare the transmission of light ratio both inside and outside canopy at the same time. This means, it is depending on the absolute value of inside and outside light; thus at least you need to purchase two instruments for inside and outside.
There is no stable atmosphere condition so researchers must care solar radiation intensity every single test. In fact, solar radiation intensity is mostly stable at cloudy weather but do you want to choose cloudy weather for field experiments? Even though solar radiation intensity is stable at cloudy weather, you still need to care the sun height, to gain the good LAI results. To do so two instruments need to place at same sun height. But can you keep setting at same height?
Do you know Plant Area Index (PAI) influencing LAI results?
General LAI sensor involve branch and dead leaves these elements cannot called leaf but major LAI meter ignoring the fact that these obstacles messing LAI results so it is impossible to correct exact LAI value.
Save time, cost and choose MIJ-15 LAI/K2
LAI sensor MIJ-15LAI /K2
MIJ15 LAI/K2 sensor provide with 5m cable so it must use with data logger. Sensor itself is same as PAR sensor MIJ14 which has a reputation for its extremely small long-term drift and robustness; this sensor intended to be permanently installed field and operated unattended.
This design has a proven track record of less than ± 0.1%/3 year drift unless destroyed in an accident. Much more durable than LAI sensors made by other companies.
LAI is slowly changing parameter so that researchers may annoyed because when measuring manually, you have to do a huge amount of work both in terms of time and effort. But MIJ-15LAIK2 is only set under the canopy and you can wait till year end.
Many LAI instruments simultaneously measure the intensity of light under the canopy and the intensity of light outside of the canopy, measurement principle is that the obtained ratio correlates with LAI. Therefore, the effect of the growth of branches and trunks blocking the light directly affects the measured value. Also, in the autumnal tree species, the leaves without chlorophyll also block the light. In other words, it is unavoidable that dead leaves are counted as LAI.
On the other hand, in MIJ-15LAI, the measurement principle is that the ratio of the near-infrared light of chlorophyll contained in leaves and the spectral transmittance of PAR correlates with LAI so it do not count dead leaves, branches, trunks, electric wires and other artificial objects that have no chlorophyll.
Absolute quantity of LAI
MIJ-15LAI/P and MIJ-15LAI Type2/K2 will let researchers to determine absolute quantity of LAI by measuring the spectral ratio of sunlight transmitted through plant canopy.
We used the measurement by spectroscopy.
PAR(400-700nm) and NIR(700-1000nm) will be reflect and absorption occur at chlorophyll inside leaf so the transmitted light ratio is correlated with LAI.
MIJ-15LAI TypeII/K2 gives numerous hopes for the feature research.
You do not need to think about weather condition and LAI and PAR can be measured just set under the canopy or leaf. Also you only need to have one MIJ-15LAI TypeII/K2 so price will be reasonable and it is portable so you can measure easily or traditionally set it at canopy; LAI annual change can be measured with data logger .
Voltage (Calibration Coefficient labeled as ###.##μE/mV)
・NIR/5mV at 1300uE
|LAI arithmetic expression||LAI=2.80In(NIR/PAR)+0.69*
*Kume et al.(2011) J Plant Res124:99_106.
PAR & NIR: uE(μmol・S-1・m-2)
|Incidence angle characteristics||<±1.5% at 0〜79°(< -50％Peak at 80〜89°)|
|Angle of rotation characteristics||<±1.5% at 0〜79°(< -50％Peak at 80〜89°)|
|Material||Case：A5052, Coating: anodized aluminum, Diffuser: PTFE|
|pin assignment||White/output+, Black/output-|
|Standard Pack||MIJ-15LAI TypeII/K2 (With 5m cable)|
Reference: Mixed Japanese and English journals