CN1095482A - A kind of acceleration sensing method with optical fibre and equipment - Google Patents
A kind of acceleration sensing method with optical fibre and equipment Download PDFInfo
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- CN1095482A CN1095482A CN 93111824 CN93111824A CN1095482A CN 1095482 A CN1095482 A CN 1095482A CN 93111824 CN93111824 CN 93111824 CN 93111824 A CN93111824 A CN 93111824A CN 1095482 A CN1095482 A CN 1095482A
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Abstract
The invention discloses a kind of acceleration fiber-sensing measuring method and equipment.To the cantilever that is fixed together with measured object, cantilever reaches the sensing purpose with part optical signals reflected back optical fiber thereby the measured object motion drives the cantilever modulated light signal to light signal along optical fiber input.Measuring method provided by the invention and equipment can be used for the acceleration test under the various situations, are particularly suitable for the acceleration test under the mal-conditions such as strong-electromagnetic field (as large-size machine), explosion-proof environment.
Description
The invention belongs to technical field of optical fiber sensing.
Existing many distinct methods of the test of acceleration and related device, but in the abominable occasion of some environment, disturb down as strong-electromagnetic field, but can not satisfy the demands.Wherein comparatively typical situation is exactly the operating monitoring of large scale electrical power unit.Along with development of electric power industry, the unit installed capacity of high-rating generator increases day by day, the electromagnetic force that its stator coil especially bears when running into suddenly-applied short circuit in normal operation increases severely, and is controlled as not taking measures to cause the bar insulation wearing and tearing, until damage.Thereby the vibration of monitoring high-rating generator stator winding end in time reports to the police to handle and avoid destructive high-voltage breakdown to discern some potential or developing end coil fault, and is significant.Propose some kinds of different schemes from the sixties both at home and abroad and carried out the motor oscillating measurement, but because this kind measured residing specific rugged surroundings, factors such as strong-electromagnetic field, the air-flow that changes rapidly, high-decibel noise, temperature all can produce strong interference to test signal, cause original scheme all to have open defect.In addition, because the signal extension line is a plain conductor, surveying instrument is communicated with high pressure on electric, even may jeopardize operating personnel's personal safety.Performances such as withstand voltage, the anti-strong electromagnetic of optical fiber excellence show obvious superiority just herein.Since the eighties, utilized optical fiber acceleration sensing measurement motor oscillating to enjoy the attention of external industry member.Optical fiber vialog (the ASEA research and invention company product description that utilizes the semiconductor fluorescence characteristic has been made by Sweden ASEA company etc., AcceleroMeter 2010), optical signals optical fiber reaches cantilever, the cantilever modulated light signal that is fixed together with measured object.For eliminating the disturbing effect of other factors on the light path, a certain amount of fluorescent material is arranged on cantilever, the light that produces another wavelength after the rayed is together passed back with the light signal after modulating, and with the light separate processes of the way that filters with two wavelength, obtains acceleration signal again.Need beam split, cantilever need add that fluorescent material is very complicated thereby the shortcoming of this method is receiving trap, cost is also high.The Italian has reported the similar sensing device (SPIE Vol.1230 International Conference on Opto-electronic Science and Engineering ' 90) of two fiber reflection formulas, its light signal reaches cantilever, light signal after the cantilever reflection modulation is passed back by another root optical fiber reception.This method has been simplified receiving trap, has avoided adding the trouble of fluorescent material.But the complicacy of owing to need two optical fiber, installing, debugging light path increases naturally, and the also inevitable variation relatively of reliability and stability, and cost can fall yet simultaneously.
Problem to be solved by this invention is only sought exactly with the simple optical fiber transmission, simplifies receiving trap simultaneously, dependable performance, stable and acceleration sensing method with optical fibre and equipment cheaply.
The objective of the invention is to realize by following method and apparatus:
A kind of optical fiber sensing method of acceleration, it comprises the following steps:
1, a series of continuous signals that produced by scrambler (as direct current, sine wave, continuous square wave etc.) are through amplifying rear drive light source luminescent and injection fibre;
2, light signal enters Transmission Fibers through optical fiber splitter and arrives cantilever on the end, and optical fiber connector and cantilever and measured object are fixed together, and cantilever leans on the one side of optical fiber that high reflecting surface thin layer is arranged, and this reflection horizon is with part optical signals reflected back optical fiber; Cantilever will move with measured object, thereby the light signal of reflected back optical fiber is modulated;
3, the light signal that will carry acceleration information by same optical fiber is passed back, and by shunt this light signal is delivered to photoelectric receiving tube light signal is converted to electric signal;
4, the electric signal sent of photoelectric receiving tube is sent into bandpass filter and low-pass filter respectively after preposition amplification, promptly is respectively acceleration modulation signal and background signal from the electric signal of two filter output;
5,4 described modulation signals and background signal are delivered to the division arithmetic of making (modulation signal/background signal) in the divider and promptly obtained required acceleration signal.
To be obtained acceleration signal reliable, stable in order to make in the said method, and the light signal by the cantilever reflected back is had a filter mould step, and the high-order mode of reflection excitation is filtered.The filter mould to the loss of luminous power greater than 1 decibel.
The device of realizing said method comprises: scrambler, driver, light source, optical fiber, optical fiber splitter, be fixed in optical fiber connector and leaning on the cantilever that high reflecting surface thin layer is arranged on the fiber facet, photoelectric receiving tube, prime amplifier, bandpass filter, low-pass filter and divider.Precision and stability for the acceleration signal that guarantees to be obtained also have a mode filter, the unwanted high-order mode of filtering near the light path of cantilever.
The present invention only sends out, receives two ways of optical signals with an Optical Fiber Transmission, and receiving trap is simple, and the total system light path is reliable and stable, installs, debugging, makes more easyly, has reduced cost significantly.
Fig. 1 is a principle of the invention synoptic diagram
Fig. 2 is a kind of embodiment of the present invention
Introduce the present invention in detail below in conjunction with embodiment.This is a system that utilizes the optical fiber acceleration sensing to carry out the test of high-rating generator stator winding end portion vibration.It is luminous through driver (2) drive light source led (3) that scrambler (1) produces sequence signal, in the tail optical fiber of this light signal injection fibre shunt (4), behind optical fiber splitter, signal is reached optical fiber (5) (single fiber cable that adopts in the practical application) and arrive another connector (13.2), enter probe district optical fiber again by the joints of optical fibre (13.1).Light signal by the optical fiber outgoing arrives on the cantilever (7), and cantilever (7) has high thin layer of reflective material by on the fiber facet, thereby with part optical signals reflected back optical fiber.Because this section optical fiber and cantilever and measured object are fixed together, driven cantilever during the measured object vibration and vibrated simultaneously, just carried the acceleration signal of measured object vibration by the light signal of cantilever reflected back optical fiber.The light signal that has carried vibration information is back to shunt (4) along original optical path, because of photoelectric receiving tube PIN(8 is delivered in the effect of optical fiber splitter) convert electric signal to, amplify by prime amplifier.Be divided into modulation signal and background signal through bandpass filter (10) and low-pass filter (11) respectively then.Modulation signal and background signal are sent divider (12) simultaneously to and are carried out division arithmetic, have promptly obtained the acceleration signal of vibration.The use of divider (12) is that also the influence that light signal is transmitted factors such as suffered little curved, temperature, flashing, optical branching device performance imperfection on the way eliminates.Simultaneously, be the precision and the stability of the acceleration signal that guarantees to be obtained, the place near cantilever between the joints of optical fibre (13.2) and cantilever (7) also has a mode filter (6).The effect of mode filter is the high-order mode that the filtering reflected light is encouraged, its to the loss of luminous power greater than 1 decibel.Enter integrator by the acceleration signal of divider (12) output and carry out quadratic integral and handle and to obtain institute's measured motor amplitude signal, thereby realize functions such as amplitude demonstration, warning.
Claims (4)
1, a kind of acceleration optical fiber sensing method, it comprises the following steps:
(1) is listed as continuous modulation signal driving light source with the light signal injection fibre with one;
(2) light signal reaches cantilever by Transmission Fibers behind optical fiber splitter, cantilever and optical fiber connector and measured object are fixed together, cantilever has high reflecting surface thin layer by on the fiber facet, and this reflection horizon is with part optical signals reflected back optical fiber, and this moment, the acceleration signal modulated was on light signal;
(3) light signal that will carry acceleration information by same Transmission Fibers is passed back, and with optical fiber splitter this light signal is delivered to photoelectric receiving tube;
(4) electric signal of photoelectric receiving tube output enters bandpass filter and low-pass filter respectively after preposition amplification, output acceleration modulation signal and background signal;
(5) (4) described acceleration modulation signal and background signal are made division arithmetic, obtain acceleration signal.
2, method for sensing according to claim 1 is characterized in that filtering the mould district through one section earlier by the light signal of cantilever reflected back optical fiber, filters high-order mode, and then passes back along optical fiber.
3, a kind of for using the custom-designed measuring equipment of the described method of claim 1, it comprises scrambler (1), driver (2), light source (3), optical fiber (5), optical fiber splitter (4), cantilever (7), photoelectric receiving tube (8), prime amplifier (9), bandpass filter (10), low-pass filter (11), divider (12), it is characterized in that the transmission of light signal and receive all adopting same wavelength and using same optical-fibre channel, finish the dispensing of signal by optical fiber splitter, the electric signal that photoelectric receiving tube (8) is sent is delivered to bandpass filter (10) and low-pass filter (11) respectively after preposition amplification, the output of two filter is connected to the input end of divider (12).
4, measuring equipment according to claim 3 is characterized in that near the place of cantilever a mode filter (6) being arranged at optical fiber connector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93111824 CN1095482A (en) | 1993-05-22 | 1993-05-22 | A kind of acceleration sensing method with optical fibre and equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93111824 CN1095482A (en) | 1993-05-22 | 1993-05-22 | A kind of acceleration sensing method with optical fibre and equipment |
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| Publication Number | Publication Date |
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| CN1095482A true CN1095482A (en) | 1994-11-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 93111824 Pending CN1095482A (en) | 1993-05-22 | 1993-05-22 | A kind of acceleration sensing method with optical fibre and equipment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105004884A (en) * | 2015-07-03 | 2015-10-28 | 北京航空航天大学 | SiC-based micro-optics high-temperature accelerometer and design method |
| CN108761130A (en) * | 2018-04-04 | 2018-11-06 | 西安工业大学 | A kind of all -fiber acceleration measurement device and method |
-
1993
- 1993-05-22 CN CN 93111824 patent/CN1095482A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105004884A (en) * | 2015-07-03 | 2015-10-28 | 北京航空航天大学 | SiC-based micro-optics high-temperature accelerometer and design method |
| CN108761130A (en) * | 2018-04-04 | 2018-11-06 | 西安工业大学 | A kind of all -fiber acceleration measurement device and method |
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| C01 | Deemed withdrawal of patent application (patent law 1993) | ||
| WD01 | Invention patent application deemed withdrawn after publication |