The laser leaf area meter may appear to be small and compact, actually containing multiple working subsystems. It is equipped with a laser width scanner that scans the leaf width at a frequency of 400 times per second and a width resolution of 0.lmn fly; A roller-type length measuring mechanism is also installed to measure the length count in lmm steps.
The various actions of the instrument are controlled by the microprocessor. Therefore, the user can flexibly set the instrument and measure it easily, quickly, and accurately. When the instrument is performing a width scan, the mirror is rotated so that the laser beam scans the object 400 times per second. The laser beam is reflected back from the inner surface of the measuring arm of the instrument and then received by the sensor inside the instrument. The sensor receiving level is compared with a certain fixed threshold level. The output of the comparator is fed to the width scanning sampling counter and the counter is The width is recorded and calculated in the scan.
There is a roller under the measuring arm of the instrument. As the leaf surface moves, the roller rolls along with it to measure its length. Every lmm forward leaves, the microprocessor is interrupted to wake up once. In the interrupt wake-up procedure, the instrument performs multiple integral operations on the length and width to obtain the parameters such as perimeter and area to be measured. The laser leaf area meter directly measures only two parameters: length and width, and derives area, perimeter, aspect ratio, and shape parameters from these two parameters.
The method of using the laser leaf area meter is as follows: hand-held instrument, pressing the measuring arm, sandwiching the blade between the instrument and the measuring arm. This method has no damage to the blade. Pressing the measuring key will automatically measure the instrument. It is recommended that you repeat the measurement several times. The instrument will automatically record each time.
Laser leaf area meter working principle and simple operation analysis
The laser leaf area meter is also called the living leaf area meter. It is used to detect the area of ​​the leaf. The instrument's maximum detection range is 25mm in thickness, 150mm in width and 32m in length. It can be taken outdoors for measurement at any time. The operation is simple and the speed is fast. High work efficiency is the best choice for measuring leaf area.