Papers by Keyword: Measurement and Control System

Abstract: Agricultural IOT (Internet of things) is the integration of modern information and communication technology in agriculture. Based on 6LoWPAN wireless sensor networks, this paper puts forward a real-time monitoring system to agricultural environment, in order to improve the function of modern agricultural greenhouse control system. This system uses the 6LoWPAN as backbone to reach the goal of point-to-point communication between NGI (next generation Internet) and wireless sensor networks signed with IPv6. It is no specific gateway to protocol transition and carrying which makes it possible to realize real-time monitoring and controlling of agricultural environment, reduce energy consumption, shorten the delay time.

Abstract: This paper mainly introduces the automatic control and measurement system of the TGP's double line five consecutive model. The water valve of locks must have multiple forms of open/close function, the control system uses microcomputer control multi-channel power stepping motor driven system, accomplish precise control according to the model test for the requirements of the valves open means .Measurement system, the real-time monitoring method, from all kinds of measuring sensor signals collection, for lock chamber filling drain hydraulic characteristic parameters and other parameters are automatically synchronized measurement. The test results show that the system is reliable, control and measurement accuracy satisfies the requirement of test.

Abstract: Controlled and alternating induction magnetic field generation device which induces plant seeds to breed on floor space has been developed. The incentive ferrite induction coil is used in the device to produce induced magnetic field. The common AC-DC-AC topology was adopted for the variable frequency power supply, and AC power inverter circuit adopts SPWM inverter frequency modulation and voltage regulation mode, realizing the sinusoidal VVF. In order to improve the conversion efficiency of system electrical energy to magnetic energy, the RLC series resonant circuit is chosen in the circuit of output magnetic field. Measurement and control system using DSP microcomputer measurement and control technology and digital PID control method. The frequency and intensity of inductive magnetic field in the air gap changes as the changes of current intensity in coils. The experimental study of rice seeds shows that test result is obviously better than traditional biological magnetization induced breeding technique of fixed magnetic poles.

Abstract: Water and fertilizer are two important factors in seedlings growth and development, the reasonable management of water and fertilizer can play a greater growth potential for seedling, and blind management of water and Fertilizer not only is harmful for seedling growth, but also will lead to the water resource waste and environmental pollution. In order to precisely determine the seedlings fertilizer demand, this paper presents a method seedlings fertilizer and water measurement and control system based on wireless sensor network, the system can realize automatic deployment of information acquisition node, data self-organization transfer, namely, wireless communication, and can accurately detect information of soil water and fertilizer and identify water and Fertilizer on the best demand of seedlings growth stages for different seedlings, different regions, different period of climate and seedling growth status, so the best water and fertilizer control is achieved in seedling cultivation. This system were introduced and analyzed from the hardware structure, software structure and so on in this paper, and it has the advantages of low power consumption, low cost, good robustness, flexibility and so on. The experiment results shown that the system is practical and efficient, which can be applied in farmland, and nursery area.

Abstract: This paper will give a solution of measurement and control system based on FPGA embedded system for the Plastic Material Dynamic High-speed Tensile Machine (PMDHTM) with 1-100s^-1 strain rate range. Using sub-modules design of Nios II soft-wore and SOPC to build measurement and control system. The state machine algorithm and servo drive device are applied to accomplish precise state control of the linear shaft motor. Collecting the stress data online and non-contacting strain measurement is adopted. The test result can well meet the linear motor control response demand below the 5Hz frequency. Compared with other control based on SCM, DSP and so on, it supplies an innovation way for the PMDHTM control.

Abstract: For transient electromagnetic meter home-made, there are some disadvantages, for example early signal detection is difficulty, and speed and accuracy of signal acquisition is no high. Therefore a high-performance TEM based on embedded PC is designed to overcome these disadvantages. And its main part is measurement and control system, which design is mainly introduced. The system consists of a transmitter and receiver modules, which hardware block diagram and schematic design are introduced in detail. Laboratory tests for the system developed show that the electromagnetic transmitter module has advantages of short off-time and high transmitting current detection accuracy; the electromagnetic receiver has advantage of high sampling speed, big dynamic range and achieving accurate measurement of early signal. Laboratory test results are satisfactory.