Dendrometer Nondestructive Absolute Linear MIJ-02LMS S-size (For sample size of dia1.5～23mm)
Reference
Dendrometers measure daily changes of trunk or stem caused by construction factors such as photosynthesis, transpiration, and sapflow; and also by hypertrophy factor which occur by the water storage during night time from root to trunk. Measuring annual changes is same as measuring speed of secondary growth and carbon fixation. Also it helps to analyze the data of the mid-term phenomenon that will change weekly from excess water stress.
Features
・Nondestructive
・High temporal resolution, High resolution, unattended measurement
・Small sized target: measurement range φ1.5～23mm
・Avoid the thermal characteristic of potentiometer by Using ratiometric output
・Minimum friction help to setting low spring constant
・IP67
Dendrometer MIJ-02 LMS
We recommend our Dendrometer MIJ-02 LMS to researchers by following reasons.
・Response to every single environmental changes with high time resolution, high resolution and no human effort.
・Thin branch and stem (between φ1.5mm and 23mm) can measure in a green way.
・Provide accurate measurements
The purpose of developing non-destructive dendrometer is because thin plants have less destruction resistance. Sample cross section will be narrowed from 3 directions of 120°division that mean offset placement of fastening part to samples. In other words, it minimizing the sample stress from equipping instruments. This stress-free structure has one more advantage that is the sensor will not take time to fit to the sample; thus, it is possible to acquire the valid measurement data right after mounting the sensor to the samples. Generally, trunk or stem will change ± several dozen µm but MIJ02-LMS dendrometer can measure tiny changes, so we set the measurement resolution less than 1 um. It depends on the resolution of data logger but generally it can gain the data with less than 0.01um resolution. (0.00911um/0.01mV.) Annual change of tropical rain forest will grow diameter direction around 10mm per year and only a few mm per year in temperate environment. Measurement range of LMS is φ1.5mm~23mm which could be enough to measuring thin sample. As annual changes, individual carbon fixation and production from individual sample will be the direct index that will be able to lead estimation of whole canopy value.
Figure1. Orange Sapling Stem growth (Click figure for enlarge)
Measured Period: May 11 to July 31
Above graph shows how Orange sapling stem growth.
As you can see there is no dramatic or rapid changes occur before harvesting fruit,
after fruit harvested the stem showed rapid growth.
Sapling is thin so dendrometer for tree cannot measure thin sample but MIJ-02 LMS
can measure thin target growth changes in micrometer.
Equipment used for this measurement: MIJ-02LMS TypeII & MIJ01 Data Logger
Specification
| Product | MIJ-02LMS Type2 (Sensor only) |
| Range | φ1.5mm~23mm |
| Output | Ratiometric (eg: When preheat 5V then output full scale is also 5V） |
| Resolution | 0.911um/mV |
| Regression Equation (Output) | dr=11000*(Vout/ Vpre) / ( 1+SQR2 ) dr: Radius displacement, Vout: Output mV, Vpre: Preheat Voltage mV, SQR: Square root Detail |
| Preheat | 5VDC (<1mA at 5VDC) |
| Withstand Voltage | <18VDC |
| Pin Assignment | Brown: preheat Blue: Output voltage Black: common (Preheat GND and output voltage GND are shared) |
| Sliding Resistance | <0.3N |
| Spring Constant | Standard (for wood) 0.3N/mm, Medium (for plants without wood)0.1N/mm |
| Linearity | ±1％ |
| Thermal Characteristic | ＜-0.126um/DEG |
| Waterproof | IP67 |
| Size | Length：133mm (When measuring max diameter 23mm) |
| Weight | 42 g (Including hummer head stay; Not including Cable) |
| Supplied | MIJ-02 LMS NITTO EPTSEALER 50cm (Used for Mounting Hummer head to plant stem) Cable Tie ×4 |
Parts List
| MIJ-02 LMS | LMS sensor, Ept sealer 50cm, Cable tie ×4 |
| Standard Cable 2m | Cable with IP68 M12 connector 2m |
| Standard Cable 5m | Cable with IP68 M12 connector 5m |
| Standard Cable 10m | Cable with IP68 M12 connector 10m |
| 5m Cable extension connector both ended | Extension Cable with IP68 M12 connectors 5m |
| 10m Cable extension connector both ended | Extension Cable with IP68 M12 connectors 10m |
| Waterproof Logger MIJ-12 | Waterproof 1ch Logger |
| MIJ-01 Data Logger | 8ch data logger (higher resolution) |
