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Tuning fork resonance frequency quick measuring method based on virtual instrument

A technology of resonance frequency and measurement method, applied in the direction of measurement of resonance frequency, instruments, measurement devices, etc., can solve the problems of long start-up time, low work efficiency, long measurement time, etc., and achieve the effect of reducing expenses

Inactive Publication Date: 2011-02-09
DALIAN UNIV OF TECH
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  • Claims
  • Application Information

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Problems solved by technology

However, for mechanical filters such as tuning forks, the start-up time is relatively long. When the frequency band involved is wide and there are many frequency points, the measurement time of this method is relatively long and the work efficiency is relatively low.

Method used

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  • Tuning fork resonance frequency quick measuring method based on virtual instrument
  • Tuning fork resonance frequency quick measuring method based on virtual instrument
  • Tuning fork resonance frequency quick measuring method based on virtual instrument

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Embodiment Construction

[0032] Such as figure 1 As shown, the present invention is composed of computer, intelligent measurement software and sound card. The intelligent measurement software drives the sound card to generate a colored noise signal with specified amplitude and bandwidth. The tuning fork is a two-port network. The signal is used as the excitation signal at the input end of the tuning fork, and the sound card data acquisition channel collects relevant data. The natural frequency of the tuning fork is measured by means of digital signal processing.

[0033] Such as figure 2 As shown, the white noise signal is passed through a band-pass filter to obtain a colored noise signal. The colored noise signal can be generated by driving a professional sound card through intelligent measurement software. The colored noise signal stimulates a dual-port network tuning fork, and the data acquisition channel of the sound card simultaneously collects the signal at the output end of the tuning fork. ...

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Abstract

The invention belongs to the technical field of test and measurement. A turning fork resonance frequency quick measuring method based on a virtual instrument is characterized in that the tuning fork starts oscillation with colored-noise signal excitation, collects signals of an output end of the tuning fork, and then carries out filtration and spectral analysis on the collected signals. The resonance frequency of the tuning fork can be quickly measured by spectral analysis. A measurement system comprises a general-purpose computer, intelligent measuring software, and a special sound card. Theintelligent measuring software generates the colored-noise signals with appointed bandwidth and value of amplitude by driving the special sound card; the colored-noise signals are used as the excitation signals of the input end of the tuning fork; and then the signals of the output end of the tuning fork is obtained by the collection of the special sound card. By the power analysis, the frequencywhich a spectrum peak corresponds to is the resonance frequency of the tuning fork. The method is based on the general purpose computer, uses the sound card as the data acquisition card, and utilizesa LabVIEW virtual instrument platform technology to compile the intelligent measuring software.

Description

technical field [0001] The invention belongs to the technical field of test and measurement, and relates to a method for quickly measuring the resonant frequency of a tuning fork through digital signal processing technology based on virtual instrument technology. Background technique [0002] The tuning fork can be regarded as a two-port network. When it is being measured, it is excited by a sine wave signal to vibrate, and the amplitude of the tuning fork changes with the frequency of the exciting sine wave. The tuning fork filter has the following advantages: simple structure, small size, low temperature coefficient of frequency, large quality factor, narrow passband, low insertion loss, and long life. Therefore, the tuning fork filter is currently widely used in the material detection switch system in the industrial field. [0003] The tuning fork filter needs to be combined with a closed-loop system to work properly. The design of the closed-loop system depends on its o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01H13/00
Inventor 赵泰洋谢兴隆姜琳郭成安金栋杰张婷
Owner DALIAN UNIV OF TECH
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