Development Of Benchtop Measuring Instrument For Leafarea

Existed in the bottom of the food chain on Earth, green plants are the biological basis of earth and the source of energy for survival. The leaf is the main organ of photosynthesis of plants. Plants relay on leaves to receive sunlight, absorb carbon dioxide in the air for photosynthesis and change into the growth of plant organic matter what plants required. Obviously, the area of the leaves will directly affect the whole process of plant growth. There are a lot of methods of measuring leaf area. The leaf area meter is widely used with high accuracy, high speed and easy operation.The benchtop leaf area meter is designed by combining microcontroller with FPGA, LED light source, SSR and light sensor, which MCU is the control unit and the FPGA is the data collection and calculation unit. The instrument can measure leaf area accurately and quickly, display real-time parameters of the leaves selectively and store measurement results through the USB interface to transfer data to a computer for processing.The issure has described the instrument's hardware circuit design, optical design, software design, antijamming measures, and analyzed the performance and error of the instrument with actual measurements.After verification and analysis of the actual measurement, the instrument has good stability, repeatability and high precision equipment to meet the actual needs. Compared with other similar products, this instrument has low cost, low power consumption, small size, high accuracy and good repeatability .