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Huang F.,Guangdong Atmospheric Sounding Technology Center | Huang H.,Guangdong Atmospheric Sounding Technology Center | Li X.,Guangdong Atmospheric Sounding Technology Center | Lin J.,Guangdong Atmospheric Sounding Technology Center
Chinese Journal of Sensors and Actuators | Year: 2011

A new design of soil moisture sensor using frequency domain reflectometry technology is introduced by derivation of equation of high frequency response of transmission line. With proper length of transmission line and appropriate resonance circuit, a simple comparator circuit connected in parallel to the resonance circuit with standing wave can determine the relationship between signal frequency and relative permittivity of soil. Thus soil moisture can be calculated in theory of permittivity and ingredient of soil. The structure of new sensor is presented and data measured is shown. Results show that data from the new sensor matches that from oven drying method,and the maximum error is less than 2% , which can meet the need of agrometeorological monitor.


Xindi L.,Guangdong Atmospheric Sounding Technology Center
Applied Mechanics and Materials | Year: 2014

This Meteorological Instruments Visualized Verification Integrated System(MIVVIS) bases on existing conventional metrology business, using measurement verification image simulation technology, dynamic displays changes of the certification process and data acquisition in real-time, completes remote automatic measurement, control and regulation, improves work efficiency, and provides technical support to the new equipments of atmospheric monitoring automation projects. © (2014) Trans Tech Publications, Switzerland.


Huang F.,Guangdong Atmospheric Sounding Technology Center | He Y.,Guangdong Atmospheric Sounding Technology Center | Lei W.,Guangdong Atmospheric Sounding Technology Center
Applied Mechanics and Materials | Year: 2013

Aiming at development and requirement of environmental monitoring, automatic weather station (AWS) must be more powerful and reliable. With distributed data acquisition nodes, new AWS extends and adds new sensors easily. Using protective power supply to each node, new system has high performance of lightning protection, which will not let system breakdown for any node crash. Three-stage automatic self-checking for node state is included, which makes failure diagnosis efficient. Data quality checking node is created in the new design. By databases and correlation models, it provides data self-checking functions for unattended AWS. Defects of old design such as fixed hardware configuration and centralized data acquisition are overcome. Flexibility and stability of AWS are improved, and data reliability of unattended AWS is improved. © (2013) Trans Tech Publications, Switzerland.

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