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Application of Illuminance Sensor in Agricultural Environment Monitoring
With the development of agricultural greenhouses, more and more fruits and vegetables can be planted in winter. In the past few years, my country’s greenhouse industry was dominated by traditional greenhouses. In recent years, the agricultural market has gradually begun to face problems such as increased competition and increased demand. Traditional greenhouses have been unable to meet market demand and must find a way out. The gradual rise of equipment agriculture and the support of related policies such as the national 'Twelfth Five-Year Plan' have greatly promoted the development of greenhouses, greenhouses and other planting industries in the direction of modernization, technology, and intelligence. Smart greenhouses have become the current modern agricultural industry. The inevitable trend. However, as the scale of agricultural greenhouses has increased and the degree of wisdom has become higher, some agricultural managers have insufficient understanding of new technologies and still manage them in the traditional way. This has led to frequent greenhouse management problems and increased risks. . The first thing to bear is the problem of illuminance. Due to the high frequency of severe weather such as haze in winter, the traditional way of managing smart greenhouses will inevitably lead to uneven illuminance, resulting in a substantial reduction in crop production. In solar radiation, the energy emitted by the part of the spectrum that is effective for plant photosynthesis is called photosynthetically active radiation; according to the demand for light intensity for growth, plants can generally be divided into sun plants, mesophytes and shades. Plant. Sun plants need to grow and develop vigorously under strong light intensity, such as Cactaceae, Rosaceae, etc.; Shade plants can only grow well under weak light intensity conditions, such as most orchids, araceae Plants and ferns;Mesophytes can grow well under sufficient light, but also can tolerate different degrees of shade. Most plants belong to this species. Different plants require different light intensity. Generally, sun plants have higher light requirements, while shady plants require lower light. Therefore, when managing light intensity in smart agricultural greenhouses, you need to pass Install illuminance sensors to reasonably distribute the amount of light according to different plants. The working principle of the illuminance sensor The illuminance sensor adopts the hot spot effect principle, and the most important thing is to use the detection components that have a high response to low light. These sensing elements are actually like the photosensitive matrix of the camera. There is a wire-wound electroplating type multi-contact thermopile whose surface is coated with a black coating with high absorptivity. The hot junction is on the sensing surface, while the cold junction is located in the body, and the hot and cold junctions generate a thermoelectric potential. In the linear range, the output signal is proportional to the solar irradiance. The visible light through the filter irradiates the imported photodiode, and the photodiode converts into an electrical signal according to the visible illuminance, and then the electrical signal enters the sensor's processor system to output the binary signal that needs to be obtained. The selection of illuminance sensor There are many categories of illuminance sensors, and some categories even optimize the structure introduced above, especially to reduce the influence of temperature. The illuminance sensor also uses temperature compensation circuits. , This greatly improves the sensitivity and detection ability of the illuminance sensor. For example, wall-mounted illuminance sensors and louver box-type illuminance sensors. How to use the illuminance sensor The illuminance sensor should be installed in an open area with no obstacles above the sensing surface. Adjust the horizontal position of the sensor, then fix it firmly, and fix the sensor firmly on the mounting frame to reduce breakage or intermittent interruption in windy days. The installation method of the wall-mounted illuminance sensor: first drill a hole on the wall, then put the expansion plug into the hole, and screw the self-tapping screw into the expansion plug. The installation method of the louver box type illuminance sensor: The louver box type illuminance sensor is generally used in outdoor weather stations, and can be directly installed on the beam of the weather station through a bracket or a bending plate. This winter, the temperature is much colder than in previous years. The low temperature and weak light will have a lot of impact on the normal photosynthesis of vegetables. When adjusting the temperature and light, you must coordinate, and you should not lose sight of the other and affect the vegetables. The output.
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