Micro-water content test system based on resonant cavity perturbation method

A micro-moisture content and testing system technology, which is applied in the direction of using microwaves to test moisture content, can solve problems such as the influence of measurement results

Inactive Publication Date: 2009-12-30
周建明
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Problems solved by technology

[0005] The existing moisture measurement principle that can realize online non-destructive measu

Method used

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  • Micro-water content test system based on resonant cavity perturbation method
  • Micro-water content test system based on resonant cavity perturbation method
  • Micro-water content test system based on resonant cavity perturbation method

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Embodiment Construction

[0013] 5.1 The overall scheme of the micro-water content test system by the resonant cavity perturbation method

[0014] According to the volume suitable for the solid resonant cavity, the industrially applicable frequency and the development of electronic technology, the parameters such as the frequency of the resonant cavity perturbation method micro-water content testing system are optimized. According to the frequency allocation of the Radio Regulatory Commission, the frequency of 2.4GHz is relatively used in this topic.

[0015] Resonant cavity perturbation method micro-water content test system scheme such as figure 1 As shown, this system includes a single-port resonant cavity 1, a waveguide microstrip transition device 2, a ring bridge 3, a VCO voltage-controlled oscillator (HMC385) 4, a PLL chip (AD4106) 5, a constant temperature crystal oscillator (100MHz) 6, and a detector (AD8318) 7, amplifier (HMC385) 8, ADC (AD7656) 9, FPGA (XC3S400) 10, DSP (TMS320F2812) 11, pr...

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Abstract

The invention relates to a micro-water content test system based on a resonant cavity perturbation method, which covers the technical fields of resonant cavities, frequency synthesizers, transmit-receive modules, signal processing and system design proposals. The system provides a proposal of frequency prescience; the proposal adopts technology of a constant temperature reference crystal oscillator and a phase-locked loop (PLL) to realize the output of a smaller stepping frequency signal; a mater controller can control the PLL according to a measurement process; VCO output frequency is set to a required frequency point so that the frequency is not needed to be measured in the process of measuring a Q value; and the proposal can accurately measure the Q value of the resonant cavity under the conditions of on-load and no-load. The system eliminates a frequency measurement module, greatly reduces the technical difficulty of the system and reduces the cost.

Description

1. Technical field [0001] The invention relates to a resonant cavity perturbation method micro-water content testing system, and the system covers the technical fields of a resonant cavity, a frequency synthesizer, a transceiver module, signal processing, and system design schemes. The microwave resonant cavity perturbation method to measure the water content in turbine oil is based on the perturbation of the resonant cavity, that is, the principle that the resonant frequency of the resonant cavity shifts with the change of the dielectric constant of the dielectric in the cavity. The system can be applied to the measurement of micro-water content in petroleum, water conservancy, etc. 2. Background technology [0002] The National Metrology Technical Specification defines the content of water in solid and liquid substances as moisture. Moisture is one of the most important parameters to know during production, transport, storage, trade and handling of solid and liquid substa...

Claims

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Application Information

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IPC IPC(8): G01N22/04
Inventor 周建明
Owner 周建明
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