Carbon dioxide concentration calibration modification device and calibration modification method

Abstract

The invention relates to a carbon dioxide concentration calibration modification device which comprises at least one calibration modification device, wherein the calibration modification device comprises a calibrated carbon dioxide concentration sensor, an MCU (Microprogrammed Control Unit), an OLED (Organic Light Emitting Diode) display screen for displaying calibration state information and real-time CO2 concentration values, indication lamps, start and calibration buttons, a ZigBee module as well as a server, a databank, a working computer, a sensor of carbon dioxide concentration to be calibrated, a ZigBee module with a hardware model same as that of the calibration device, a gathering terminal, a mobile phone APP and short messages. By exploring historical data, an optimal calibration mode and calibration time can be found, so that calibration operation can be relatively efficient. Meanwhile, calibration difficulties can be reduced, the measurement accuracy of the CO2 concentration sensor can be improved, reliable and accurate bases can be provided for monitoring of carbon dioxide concentration and fertilization of carbon dioxide in environments of greenhouses, and realistic bases are also provided for precise control on draft fans and air windows of pig houses and livestock rooms.

Description

technical field [0001] The invention relates to the technical field of carbon dioxide concentration calibration and correction under the background of agricultural informatization, in particular to a carbon dioxide concentration calibration and correction device and method for greenhouse planting, greenhouse cultivation, livestock and poultry breeding and other environments, and is also applicable to gases such as ammonia in livestock and poultry breeding Calibration correction. Background technique [0002] With the continuous development of agricultural informatization, precision agricultural information collection technology has become one of the key technologies in this development direction. Precision agricultural information plays an important guiding role in the growth of crops and livestock. Especially carbon dioxide is not only the necessary raw material for photosynthesis of green crops and an important guarantee for high yield, but also an important factor affecti...

AI Technical Summary

Problems solved by technology

Especially carbon dioxide is not only the necessary raw material for photosynthesis of green crops and an important guarantee for high yield, but also an important factor affecting the growth of livestock and poultry and the production of meat and eggs; therefore, it is used in many occasions such as greenhouse cultivation, greenhouse cultivation, livestock and poultry breeding , for CO 2 Accurate collection of such gas concentrations plays a vital role; and with the continuous expansion of the development scale of farms or facility agricultural bases, several or even dozens of CO 2 Concentration sensors, which are often collected and aggregated through wireless networking technology; due to CO 2 The concentration sensor works in the indoor environment for a long time, especially in the greenhouse environment with high temperature and high humidity. The output signal of the concentration sensor is prone to zero drift due to factors such as the environment and the aging of its own devices, resulting in low consistency, sensitivity and accuracy of the measured value. Difference

Therefore, regular calibration is required. Calibration methods include: nitrogen zero point calibration, chemical method zero point calibration, stable environment short-term calibration, environment automatic long-term calibration, etc. Usually, stable environment short-term zero point calibration is used. During calibration, the sensor is disassembled and placed in an outdoor environment. Command or button to calibrate; it has the following deficiencies: 1. CO in the air 2 The concentration fluctuates at different times and places, which can easily lead to inaccurate calibration; 2. Ordinary agricultural workers do not have the technical conditions for calibration implementation; 3. CO 2 Concentration sensors are often not used alone, and are usually equipped with a variety of sensors such as illuminance, air temperature and humidity, substrate temperature and humidity, and ammonia concentration, which makes the process of disassembly or reinstallation complicated during calibration; 4. During this period of calibration, CO 2 The collection of concentration data will be interrupted, which will affect agricultural production

Existing CO 2 In the concentration calibration correction case, the calibration technology and measures cannot be fully involved in terms of ease of use and economy, such as the patent "Method and device for automatic calibration and measurement of gas concentration using infrared light absorption characteristics" (CN 100494983 C) and "Gas Sensor Automatic Calibration Method and Device" (CN102866232 A) uses a chamber or gas tank integrated with a known concentration of gas to switch or blow to perform calibration. The mechanism is relatively complicated, the manufacturing is complicated and the cost is high, and it is not suitable for large-scale promotion; And some put the sensor in the air, and calibrate it by recursively compensating the difference between the measured value and the actual value, such as the patent "CO 2 Gas sensor zero point self-calibration method in the air" (CN 101975839 A), and some gas sensors to be calibrated are calibrated through the measured value of a high-precision gas sensor connected to the MCU interface, such as the patent "Automatic calibration of gas sensors System and gas sensor calibration method” (CN 103399123 A)

The author believes that the above method can be used in CO 2 The sensors have been integrated and used, the number is large, the cost should not be too high, the implementation should not be complicated, and it is not easy to disassemble. It cannot fully meet the requirements of calibration applications; therefore, there is an urgent need for a CO with high usability, low cost and high efficiency. 2 Concentration calibration and correction mechanism to improve its measurement accuracy and realize CO2 in indoor environment 2 Reliable calibration correction of concentration

Images