Application of Leaf Humidity Sensor in Plant Greenhouse Control System

The growth of precious flowers, nursery stocks, and back-season vegetables requires natural environmental conditions for growth, including temperature, humidity, light, and carbon dioxide levels. When climatic conditions do not meet the above requirements, they grow poorly, withering, rot or die. If the greenhouse is intelligently controlled so that its climate parameters are always in the optimal state for plant growth, it will greatly increase its output and grade, and bring about better economic benefits. At present, there are few intelligent control applications for agricultural greenhouses in China, mainly because such equipment is expensive and not suitable for national conditions. To this end, we have developed a low-cost plant greenhouse automatic control system that can provide the optimum temperature, humidity, light intensity and carbon dioxide content and other climatic conditions for plant growth, and is most suitable for the existing medium and low grades in China. The "intelligent" transformation of greenhouses is in line with the level of farmers' consumption and is suitable for China's national conditions. Foliar humidity sensors are an important part of the moisture analysis of crop foliage.

The function of the sensor subsystem is to convert climate parameters into voltage parameters. It is the main source of information for the monitoring system and relates to the reliability and accuracy of the entire system for detection, data analysis, and control. Mainly include soil moisture sensor, leaf surface humidity sensor, air temperature and humidity integration sensor, light intensity sensor, CO2 sensor. Due to the large area of ​​the greenhouse, the sensor is a fixed-point instrument, so the use of various types of sensors is large.

Real-time data collection and processing of leaf surface humidity sensors. In order to ensure real-time detection of environmental changes in the greenhouse, data collection and processing must meet certain time limits so that they can be processed in real time to resist accidents. Most of the functions of the system are realized by software. Since the peripheral circuit is simple, the software can be modified at any time, so the adaptability is strong. The operator can change the preset parameters of the environment according to the habits and growth characteristics of the plants in the greenhouse and ensure the plant growth environment. optimal.

Thrust Spherical Plain Bearings  have a convex spherical surface on the shaft washer and a corresponding concave spherical surface in the housing washer. They are intended to accommodate primarily axial loads but can also accommodate combined (radial and axial) loads. The radial load component of a combined load should not exceed 50% of the axial load component. When radial loads are larger, it is advisable to combine thrust bearings with radial bearings in the GE dimension series . Thrust spherical Plain Bearings are separable, e.g. shaft and housing washers can be mounted separately.
Thrust spherical plain bearings with the maintenance-free steel/ PTFE FRP (fibre reinforced polymer containing PTFE) sliding contact surface combination as standard. Other sliding surface combinations are available on request (Special designs).

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