Temperature and humidity are very important for living organisms on the earth. In the process of agricultural development, it is also an important environmental parameter. Only suitable temperature and humidity can promote crop growth and increase yield. In general, the measurement of temperature and humidity is separated. However, this method is cumbersome. With the development of modern science and technology, the temperature and humidity recorder is operational, which greatly facilitates the determination of agriculture.
In general, the temperature in the 1.2-1.5 m high-louvered box on the ground is taken as the temperature on the ground. It can not only block solar radiation and ground scattering, but also ventilation. When measuring air temperature, the effect of radiation should be reduced as much as possible. When the metal cylinder is used to block the radiation, its shape, color and size are different, and the measured temperature is also different. The value in the shutter box is not absolutely correct. The temperature reading is correct only when the wind is cloudy. When the solar radiation is strong and there is no wind, the temperature value is about 1.5°C higher, and it is about 0.5°C lower on sunny days. Recently, the meteorological department placed a platinum resistance thermometer inside a metal cylinder and forced ventilation to perform far and away measurements.
In the determination of outdoor meteorological parameters, the most difficult is the measurement of humidity, and it is more difficult to measure at low temperatures. In the use of ventilation and drying time, when the wet bulb temperature difference of 1 °C, the wet bulb temperature will have an error of 0.5 °C, the temperature above O °C, the relative humidity error is less than 10%, but the temperature at a 10 °C The following error will be greater than 20%. Dew point timing makes dew judgment difficult. When the humidity is low, the deuterium chloride dew point meter cannot be used. The relative humidity, moisture content, dew point temperature, etc. are generally used to express the amount of steam. Mixture ratio and specific humidity can also be used. The mixing ratio refers to the ratio of the amount of water vapor in the air to the amount of dry air. Specific humidity is the amount of water vapor in a unit mass of moist air.
In the past, the measurement of temperature and humidity was as tedious as mentioned above, and affected by many factors, the measured data was not very accurate. For this reason, it is very convenient and quick to apply a temperature and humidity recorder for measurement and analysis.
In general, the temperature in the 1.2-1.5 m high-louvered box on the ground is taken as the temperature on the ground. It can not only block solar radiation and ground scattering, but also ventilation. When measuring air temperature, the effect of radiation should be reduced as much as possible. When the metal cylinder is used to block the radiation, its shape, color and size are different, and the measured temperature is also different. The value in the shutter box is not absolutely correct. The temperature reading is correct only when the wind is cloudy. When the solar radiation is strong and there is no wind, the temperature value is about 1.5°C higher, and it is about 0.5°C lower on sunny days. Recently, the meteorological department placed a platinum resistance thermometer inside a metal cylinder and forced ventilation to perform far and away measurements.
In the determination of outdoor meteorological parameters, the most difficult is the measurement of humidity, and it is more difficult to measure at low temperatures. In the use of ventilation and drying time, when the wet bulb temperature difference of 1 °C, the wet bulb temperature will have an error of 0.5 °C, the temperature above O °C, the relative humidity error is less than 10%, but the temperature at a 10 °C The following error will be greater than 20%. Dew point timing makes dew judgment difficult. When the humidity is low, the deuterium chloride dew point meter cannot be used. The relative humidity, moisture content, dew point temperature, etc. are generally used to express the amount of steam. Mixture ratio and specific humidity can also be used. The mixing ratio refers to the ratio of the amount of water vapor in the air to the amount of dry air. Specific humidity is the amount of water vapor in a unit mass of moist air.
In the past, the measurement of temperature and humidity was as tedious as mentioned above, and affected by many factors, the measured data was not very accurate. For this reason, it is very convenient and quick to apply a temperature and humidity recorder for measurement and analysis.
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