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Humidity measuring method based on radio frequency

A humidity measurement and radio frequency technology, applied in the field of humidity sensors and sensors, can solve the problems of high cost, strict instrument processing requirements, and inapplicability, and achieve the effect of a more convenient and simpler implementation method

Inactive Publication Date: 2012-08-15
湖南中大智能科技有限公司
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  • Claims
  • Application Information

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Problems solved by technology

There is also a microwave hygrometer, which measures the humidity of the air through the degree to which the air absorbs microwave radiation. Although this method has a wide measurement range, the instrument processing requirements are strict, the cost is high, and it is not suitable for measurement occasions where the humidity changes rapidly.

Method used

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  • Humidity measuring method based on radio frequency
  • Humidity measuring method based on radio frequency
  • Humidity measuring method based on radio frequency

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Experimental program
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Effect test

Embodiment 1

[0028] A method for measuring humidity based on radio frequency, comprising the following steps:

[0029] A. According to the measured environment (indoor and outdoor), select the parameters for water vapor to absorb radio frequency signals, determine the distance between measuring devices, determine the frequency and power of radio frequency transmission, and install each device. In the present experiment, the distance between the radio frequency transmitting and receiving devices is set to 10 meters, and the parameters The value is 0.0494mW / g, the path loss The value is 44.7dBm.

[0030] B. The radio frequency transmitting device receives the command sent by the host, transmits the radio frequency signal to the surrounding receiving device, and the receiving device reads the power of the received radio frequency signal through the power measurement module in the data processing module, and sends it to the host. The RF transmission frequency is 915MHz, the transmission po...

Embodiment 2

[0037] According to the step of embodiment 1, the interval between the radio frequency transmitting and receiving device is set to 50 meters, the parameter The value is 0.0046mW / g, the path loss The value is 75.3dBm, the RF transmission frequency is set to 433.92MHz, the transmission power is set to 10dBm, and the received power in the receiving module is -69.9dBm in a rainy day. Calculated according to the formula, the absolute humidity of the air under the two weather conditions is 20.05g / m 3 , which is converted to a relative humidity of 87% according to the temperature at the time of measurement. In the same environment, the relative humidity of the air measured with an impedance hygrometer is 86%, and the relative humidity of the air measured with a wet and dry bulb is 89%.

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Abstract

The invention provides a humidity measuring method based on a radio frequency. A host processing module calculates a content of water vapor in the air according to a received radio frequency transmitting power and a received power. The humidity measuring method comprises the following steps of: firstly, determining a distance between a transmitting module and a receiving module and parameters of a water vapor absorption radio frequency signal; sending a radio frequency signal with a certain frequency to the receiving module through an antenna at a certain sending power by a radio frequency transmitting module within a short period; sending a transmitting power of the radio frequency to a host through the antenna in a microwave manner; and calculating a radio frequency power absorbed by water according to a receiving power calculated by a data processing unit in the radio frequency receiving module, so as to calculate an air humidity. The humidity measuring method provided by the invention is convenient, simple and rapid and has a wide applicable range.

Description

technical field [0001] The design belongs to the technical field of humidity sensors in the field of sensors, and in particular relates to a method for measuring humidity by radio frequency. Background technique [0002] The commonly used hygrometers mainly include wet and dry bulbs and impedance hygrometers. Wet and dry bulbs are one of the oldest and most commonly used humidity measurement methods. The relative humidity measurement accuracy is high within the range, but it is only suitable for air humidity measurement within the temperature range of 0~85°C. Impedance hygrometers also work unstable in high-temperature and high-humidity environments and are prone to aging. There is also a microwave hygrometer, which measures the humidity of the air through the degree to which the air absorbs microwave radiation. Although this method has a wide measurement range, the instrument processing requirements are strict, the cost is high, and it is not suitable for measuring occasio...

Claims

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Application Information

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IPC IPC(8): G01N22/04G06K7/00
Inventor 郭海艳郭迎赵于前周婧莹
Owner 湖南中大智能科技有限公司
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