Oscillating circuit of a coaxial phase method moisture content meter
An oscillation circuit and phase method technology, applied in the direction of electrical components, etc., can solve the problem of inconsistent output of two sinusoidal signals, and achieve the effect of suppressing interference and solving output inconsistency.
Active Publication Date: 2017-11-14
BEIJING TECHNOLOGY AND BUSINESS UNIVERSITY
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Problems solved by technology
[0006] In order to solve the above engineering technical problems, the present invention proposes a sinusoidal oscillator circuit, which solves the problem of inconsistent output of two sinusoidal signals and suppresses the interference between them at the same time
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[0022] The present invention will be further described through the embodiments below in conjunction with the accompanying drawings.
[0023] Such as figure 2 As shown, the oscillating circuit of the coaxial phase method moisture content meter of the present invention includes: a main vibration plate circuit and two completely identical isolation plate circuits.
[0024] Such as image 3 As shown, the main vibration board circuit includes: a crystal oscillator, a three-point oscillator circuit, an amplifier circuit, a parallel resonance circuit, a primary resonance circuit and a load capacitor to generate a 75.02MHZ high-frequency signal.
[0025] The nominal frequency of the crystal oscillator JT1 is 75.02MHz, the allowable frequency difference is ±0.5KHz at room temperature, the output quasi-sine signal, the working voltage is +12V, and the overall size is 39.8*12.3*0.8mm 3 .
[0026] Such as Figure 4 As shown, the adjustable capacitor CW and the first capacitor C1 are ...
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The invention discloses an oscillating circuit of a coaxial phase method moisture content meter. The oscillating circuit of the present invention comprises: a main vibration board circuit and two completely identical isolation board circuits; wherein, the main vibration board circuit generates high-frequency signals, and the two identical high-frequency signals are respectively passed through two identical output ports Input to two identical isolation board circuits; the signals between the two isolation board circuits are isolated from each other without interference, so that one main vibration board circuit drives two isolation board circuits and outputs two signals with exactly the same amplitude and phase . The invention adopts one main vibration board circuit to drive two isolation board circuits, and outputs two high-frequency signals with completely consistent amplitude and phase, solves the problem of inconsistent output of two sinusoidal signals, and suppresses mutual interference at the same time.
Description
technical field [0001] The invention relates to a water content meter, in particular to an oscillating circuit of a coaxial phase method water content meter. Background technique [0002] The water content of crude oil is an important indicator of production logging. Most oil fields in my country adopt the method of water injection to maintain the balance of downhole pressure. There have been changes, and sometimes there is a phenomenon of "empty pumping". It causes a waste of resources and increases costs. The coaxial phase method water finding instrument is a logging instrument for measuring the water content of crude oil, and its core part is the water content meter. [0003] The work of the moisture content meter includes a coaxial sensor, a transmitting circuit, a receiving circuit, a local oscillator circuit, a frequency mixing circuit, a phase detection circuit, an integrating circuit and a voltage-frequency conversion circuit; among them, the transmitting circuit ge...
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IPC IPC(8): H03B28/00
Inventor 刘翠玲王进旗姜旭秦彬彬赵琦
Owner BEIJING TECHNOLOGY AND BUSINESS UNIVERSITY