Device and method for measuring leaf area indexes automatically and fast

Abstract

The invention discloses a device for measuring leaf area indexes automatically and fast. The device comprises a laser, a photoelectric sensor, a signal processor, a data acquisition card and a computer, and further comprises a travelling mechanism, a motor driver and a motor control circuit board. According to the invention, the travelling trace of a U-shaped rack on the travelling mechanism is programmed and designed by a virtual instrument Lab VIEW 2010, the working of a stepping motor is controlled according to the output signals of the data acquisition card, and the stepping motor is used for controlling the travelling trace of the U-shaped rack on the travelling mechanism, so as to realize the fast positioning and the multidimensional automatic testing of a testing point. The invention further provides a method for measuring the leaf area indexes automatically and fast, so as to obtain the relation between a voltage value and the number of overlapped leaves by conducting fitting test on the testing point. Compared with the prior art, the invention has the advantage that the device is controlled automatically by adopting the stepping motor, so as to greatly improve the testing efficiency, and save large quantities of man power and testing time.

Description

technical field [0001] The invention relates to ecological data measurement technology, in particular to a device and method for rapid and automatic measurement of leaf area index. Background technique [0002] Leaf Area Index LAI (Leaf Area Index) refers to the ratio of the total area of ​​crop leaves on a piece of land to the land area, and is an important structural parameter of the ecosystem, used to reflect the number of plant leaves, changes in canopy structure, and plant community life Vitality and its environmental effects. At present, the indirect optical model measurement method in the LAI detection method mainly studies the void ratio, that is, the probability that the solar radiation in the canopy is not intercepted, and a series of canopy LAI analysis instruments based on void analysis have emerged. However, due to a large number of overlapping leaves, when the leaf area index reaches 5 to 6 times, the total area of ​​leaves per unit land area is large, resulti...

AI Technical Summary

Problems solved by technology

This invention requires the user to hold a U-shaped frame equipped with a laser and a photoelectric transmitter to test the leaves point by point. The test speed is relatively slow, and the influence of human factors cannot be ruled out, which has a certain impact on the test accuracy, and it takes a lot of money. A lot of manpower and time; in addition, if the test is performed on taller crops, the operation is very inconvenient

Images