CN101526393B - Method for measuring oscillation frequency and oscillation frequency measuring device - Google Patents
Method for measuring oscillation frequency and oscillation frequency measuring device Download PDFInfo
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- CN101526393B CN101526393B CN2009101274775A CN200910127477A CN101526393B CN 101526393 B CN101526393 B CN 101526393B CN 2009101274775 A CN2009101274775 A CN 2009101274775A CN 200910127477 A CN200910127477 A CN 200910127477A CN 101526393 B CN101526393 B CN 101526393B
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Abstract
The invention provides a method for measuring oscillation frequency. The method comprises: the change of scattered light is transmitted to a photomuitplier specially used for photon counting through optical fiber when objects vibrate, the photomuitplier transforms optical signals into electrical signals, and then the electrical signals are transmitted to a photoelectric pulse counter; data output by the photoelectric pulse counter is transmitted to a data processing computer, and the data processing computer utilizes a photon correlation method to process the data; after that, the data is transformed by Fourier, so that power spectrum image and data of oscillation frequency distribution can be obtained.
Description
Technical field:
What the present invention relates to is a kind of measuring method, especially a kind of method of measuring vibrations frequency.
Background technology:
In the prior art, technique known is No. 02103972.0 patent of authorize being announced by Patent Office of State Intellectual Property Office, this patent disclosure the technical scheme of a kind of " vibration measurement device " with optical fibre detector.The principle of work that this scheme adopted is, light transmitting fiber is in the time spent of doing that is subjected to extraneous vibration, the refractive index gradient of light transmitting fiber inside changes, cause the reflection and the diffraction of light transmitting fiber inner light beam to change, cause by fibre-optic light intensity to change, but detect just measuring vibrations data of this intensity variations.Utilize this principle, this scheme adopts light transmitting fiber is wrapped on the inductor, there is laser to inject at fibre-optic light inputting end, fibre-optic bright dipping end has photodiode to receive, export through current-voltage conversion with after amplifying, inductor then is to be placed on the vibrating object, therefore, this scheme is a kind of measuring method of contact, and one of problem that contact type measurement exists, be that sniffer will be fixed on the vibrating object, this will change its mechanical property to the less object of volume, and the vibration data that records also will distortion, so this scheme only is applicable to large-sized object, and not being suitable for the measurement of the less object vibration of volume, this is the existing in prior technology weak point.
Summary of the invention:
Purpose of the present invention is exactly at the existing in prior technology deficiency, and provide a kind of technical scheme of method of measuring vibrations frequency, this scheme is a kind of contactless measurement, the variation of scattered light comes the measuring vibrations frequency when utilizing object vibration, the variation of collecting the vibrating object scattered light forms the data stream of electric pulse, the data stream that obtains utilizes the photon correlation method to carry out computing by computing machine, just can draw the relevant data of vibration frequency.
This programme is realized by following technical measures:
The characteristics of the method for measuring vibrations frequency are, the variation of scattered light sends the photomultiplier of photon counting special use to during with object vibration by light transmitting fiber, photomultiplier converts light signal to electric signal and flows to the photoimpact counter, the data of photoimpact counter output are given data handling machine, after data handling machine utilizes the photon correlation method that data are handled, through Fourier transform, provide power spectrum chart picture and data that vibration frequency distributes again.
The beneficial effect of this programme can be learnt according to the narration to such scheme, because this scheme is that the variation of scattered light comes the measuring vibrations frequency when utilizing object vibration, collect, transmit the variation of vibrating object scattered light with photo detecting unit and optical transmission unit, the variation of light is converted to the data stream of electric pulse with photomultiplier module and photoimpact counting module, the data stream that obtains utilizes the photon correlation method to carry out computing by computing machine, just can draw the relevant data of vibration frequency.Thisly utilize the application of photon correlation method on vibration frequency is measured, it is the known new application technology of photon correlation method, the photon correlation method is computing machine carries out auto-correlation computation to the data stream of input a method, the autocorrelation certificate that obtains through computing obtains required result with Fourier transform again, time threshold and data volume that its resolution as a result that obtains with the photon correlation method and precision depend on sampling, the photon correlation method is used for its time threshold value of measurement of vibration frequency can be in the microsecond level, and the scope of measuring vibrations frequency can be by 1 hertz to the number megahertz, and can preserve raw data, for follow-up data is provided by the condition that provides.This programme is that the scattered light when utilizing object vibration changes vibration characteristics is measured, and therefore, vibrating object is not had specific (special) requirements, and not needing has any contact with vibrating object, is a kind of contactless measurement.Owing to be to measure with the variation of scattered light, therefore,, do not need ad hoc light source as long as vibrating object has scattered light and just can measure, if can adopt certain irradiate light, such as using laser radiation, the effect that records is just better.The conveying that adds the scattered light variation again is to adopt light transmitting fiber as optical transport unit, the light probe of photo detecting unit is again fibre-optic light inputting end, this structure that realizes signals collecting and transmission with light transmitting fiber, sampling operation is very simple, only needing that light probe is aimed at vibrating object keeps both relative fixed to get final product, and can grow Distance Transmission between sampling and the data processing and not be subjected to electromagnetic interference (EMI), can realize online detection, can carry out multi-faceted sampling of while to vibration object again, realize two-dimensional measurement.The structure of this programme device is very simple again, and the equipment that relates to seldom is convenient to move and carry.This shows that the present invention compared with prior art has outstanding substantive distinguishing features and obvious improvement, the beneficial effect of its enforcement also is conspicuous.
Description of drawings:
Structural representation when Fig. 1 specifically implements for the inventive method.
Among the figure, 1 is photo detecting unit, and 2 is installing mechanism, and 3 is optical transport unit, and 4 is the photomultiplier transit tube module, and 5 is data processing unit, and 6 is data handling machine, and 7 is the photo-impulses counting module.
Embodiment:
For clearly demonstrating the technical characterstic of this programme,, and, this programme is set forth in conjunction with its accompanying drawing below by an embodiment.
The characteristics of the method for the measuring vibrations of this programme are, the variation of scattered light sends the photomultiplier of photon counting special use to during with object vibration by light transmitting fiber, photomultiplier converts light signal to electric signal and flows to the photoimpact counter, the data delivery of photoimpact counter output is given data handling machine, after data handling machine utilizes the photon correlation method that data are handled, through Fourier transform, provide power spectrum chart picture and data that vibration frequency distributes again.
By accompanying drawing as can be seen, the vibration frequency measurement of this programme has photo detecting unit 1 to connect optical transport unit 3, optical transport unit 3 connects data processing unit 5, the described data processing unit 5 of this programme has photomultiplier transit tube module 4 by being electrically connected photoimpact counting module 7, and photoimpact counting module 7 is by being electrically connected data handling machine 6; Described optical transport unit 3 is light transmitting fibers; Described photo detecting unit 1 is a light probe, and this light probe is exactly optical transport unit 3 fibre-optic light inputting ends.On described photo detecting unit 1, also have installing mechanism 2, in order to the fixed installation probe.
Claims (1)
1. the method for a measuring vibrations frequency, it is characterized in that: the variation of scattered light sends the photomultiplier of photon counting special use to during with object vibration by light transmitting fiber, photomultiplier converts light signal to electric signal and flows to the photoimpact counter, the data of photoimpact counter output are given data handling machine, after data handling machine utilizes the photon correlation method that data are handled, through Fourier transform, provide power spectrum chart picture and data that vibration frequency distributes again.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101274775A CN101526393B (en) | 2008-12-31 | 2009-03-06 | Method for measuring oscillation frequency and oscillation frequency measuring device |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810249661.2 | 2008-12-31 | ||
| CN200810249661 | 2008-12-31 | ||
| CN2009101274775A CN101526393B (en) | 2008-12-31 | 2009-03-06 | Method for measuring oscillation frequency and oscillation frequency measuring device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101526393A CN101526393A (en) | 2009-09-09 |
| CN101526393B true CN101526393B (en) | 2011-09-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2009101274775A Expired - Fee Related CN101526393B (en) | 2008-12-31 | 2009-03-06 | Method for measuring oscillation frequency and oscillation frequency measuring device |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103499386B (en) * | 2013-09-26 | 2015-08-19 | 重庆理工大学 | A kind of method and apparatus of precision measurement frequency |
| CN111238630A (en) * | 2020-03-05 | 2020-06-05 | 沈阳工程学院 | Method for distinguishing vibration frequency of rotating machinery |
| CN111638402B (en) * | 2020-05-21 | 2021-12-31 | 山西大学 | Method and system for measuring frequency of microwave signal in microwave electric field |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1558189A (en) * | 2004-01-29 | 2004-12-29 | 复旦大学 | Full optical fiber positioning and testing method for strain and vibration |
| CN1945237A (en) * | 2006-11-03 | 2007-04-11 | 北京航空航天大学 | Vibration measuring device based on micro opto-electromechanic system |
| CN201373772Y (en) * | 2008-12-31 | 2009-12-30 | 济南大学 | Vibration frequency measuring device |
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2009
- 2009-03-06 CN CN2009101274775A patent/CN101526393B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1558189A (en) * | 2004-01-29 | 2004-12-29 | 复旦大学 | Full optical fiber positioning and testing method for strain and vibration |
| CN1945237A (en) * | 2006-11-03 | 2007-04-11 | 北京航空航天大学 | Vibration measuring device based on micro opto-electromechanic system |
| CN201373772Y (en) * | 2008-12-31 | 2009-12-30 | 济南大学 | Vibration frequency measuring device |
Non-Patent Citations (1)
| Title |
|---|
| 段发阶等.叶尖定时旋转叶片实时振动测量技术.光电工程.2005,32(3), * |
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| CN101526393A (en) | 2009-09-09 |
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