CN107560713A - Vibration signal extraction element based on gradual change transmitance filter - Google Patents
Vibration signal extraction element based on gradual change transmitance filter Download PDFInfo
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- CN107560713A CN107560713A CN201711019078.8A CN201711019078A CN107560713A CN 107560713 A CN107560713 A CN 107560713A CN 201711019078 A CN201711019078 A CN 201711019078A CN 107560713 A CN107560713 A CN 107560713A
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- filter
- gradual change
- vibration signal
- change transmitance
- transmitance
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- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
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Abstract
The present invention relates to a kind of vibration signal extraction element based on gradual change transmitance filter, including：Laser, gradual change transmitance filter, convex lens, photoelectric sensor and data collecting system；Laser launches laser beam to the optical reflection face of vibrating body to be measured, and the reflected light of formation passes sequentially through the gradual change transmitance filter and convex lens being coaxially disposed；Then it is arranged on the optical sensor at concave lens focus to receive, the signal of optical sensor output is gathered by data collecting system.The present invention is simple in construction, and cost is cheap, can effectively extract vibration signal waveforms.
Description
Technical field
The present invention relates to vibration measuring technical field, and in particular to a kind of vibration signal extraction dress based on gradual change transmitance filter
Put.
Background technology
The non-cpntact measurement of vibration signal, there is reality in building and bridge safety supervision and anti-terrorism monitoring etc.
Applying value, optically realize the non-contact reading of vibration signal, can expand significantly vibration signal measurement should
Use scope.From the principle of forced vibration, vibration frequency and the vibration source of building, bridge or glass are consistent.Therefore,
It is that would know that the vibration information of vibration source to detect the Oscillation Amplitude of forced oscillation kinetoplast and frequency.
By light beam irradiate vibrating body reflecting surface, reflecting surface because vibration can cause reflected light at grade under back and forth
Fluctuation, the fluctuation carry the amplitude and frequency information of forced oscillation kinetoplast.But in most cases, the amplitude of forced oscillation kinetoplast compared with
It is small, cause that the reflected beams swing laterally apart from very little, and have enter opto-electronic receiver using part flare in the prior art
The method of device receives vibration signal, can complete demodulated signal frequency, but the vibration signal waveforms recovered have it is obvious
Distortion.
The content of the invention
The present invention provides a kind of vibration signal extraction element based on gradual change transmitance filter, and simple in construction, cost is cheap,
Vibration signal waveforms can effectively be extracted.
The technical scheme is that：Based on the vibration signal extraction element of gradual change transmitance filter, including：Laser,
Gradual change transmitance filter, convex lens, photoelectric sensor and data collecting system；
The laser launches laser beam to the optical reflection face of vibrating body to be measured, and the reflected light of formation, which passes sequentially through, coaxially to be set
The gradual change transmitance filter and convex lens put；Then it is arranged on the optical sensor at concave lens focus to receive, optical sensor is defeated
The signal gone out is gathered by data collecting system.
Further, the photoelectric sensor includes photoelectric tube, pre-amplification circuit, the low-pass filter circuit being sequentially connected
And second amplifying circuit.
Further, along reflection light direction, a bandpass filter is set before the gradual change transmitance filter.
Further, the laser is 650nm 5mW semiconductor laser module.
Further, the gradual change transmitance filter model ND8.
The present invention has beneficial effect：From the big the Graduated Filter of transmitance variable gradient, make the light intensity of light beam with vibration
Frequency produces change, and the pendular reflex light of isocandela is converted into the optical signal of strength fluctuation, improves the sensitivity of signal detection；
Using bandpass filter, most of clutter interference light beyond optical maser wavelength is filtered out, improves the signal to noise ratio of detecting system.
Brief description of the drawings
Fig. 1 is fundamental diagram of the present invention；
Fig. 2 is photosensor structure schematic diagram of the present invention；
Fig. 3 is the pre-amplification circuit schematic diagram of one embodiment of the invention；
Fig. 4 is the second amplifying circuit schematic diagram of one embodiment of the invention.
Embodiment
Below in conjunction with the accompanying drawings and embodiment the present invention will be further described.
As shown in figure 1, the vibration signal extraction element based on gradual change transmitance filter, including：Laser, gradual change transmitance
Filter, convex lens, photoelectric sensor and data collecting system；
Laser transmitting laser beam to the optical reflection face of vibrating body to be measured, the reflected light of formation passes sequentially through what is be coaxially disposed
Gradual change transmitance filter and convex lens；Then the optical sensor at concave lens focus is arranged on to receive, optical sensor output
Signal is gathered by data collecting system.
In an embodiment of the present invention, as shown in Fig. 2 photoelectric sensor include be sequentially connected photoelectric tube, preposition amplification
Circuit, low-pass filter circuit and second amplifying circuit.Photoelectric tube is PIN photodiode, pre-amplification circuit and two level amplification
Circuit selects AD620, this is a inexpensive, high-precision instrument amplifier, it is only necessary to and a non-essential resistance sets gain,
There is the high and low noise of input impedance.Pre-amplification circuit and second level amplifying circuit are as shown in Figure 3 and Figure 4.Low pass filtered
Wave circuit into Butterworth LPF, its model MAX7410, is powered using 5 order clusters of Maxim companies using 5V, according to
According to vibration signal to be measured, the frequency of change LPF input clock signal, so as to realize good matching.
In an embodiment of the present invention, along reflection light direction, set a 650nm's before the gradual change transmitance filter
Bandpass filter.
In an embodiment of the present invention, the laser is 650nm 5mW semiconductor laser module, is installed in the module
There are 650nm laser diodes, constant power driven circuit plate and collimation lens, wire is connected 5V dc sources and can lighted, and sends out
Go out the good red laser beam of collimation；Module front lens part is rotatable, can adjust the size of hot spot, facilitates signal receiving end
Alignment receives reflected light signal.
In an embodiment of the present invention, the gradual change transmitance filter model ND8, transmitance variable gradient are big.Because
The amplitude of forced vibration is smaller, the reflected beams horizontal swing apart from very little, can have using the big filter of transmitance variable gradient
Effect improves the sensitivity of signal detection.
In an embodiment of the present invention, audio signal is sent using audio amplifier, allows the glass of building to do forced vibration；It will swash
Light device and reflection light receiving part are fixed on tripod respectively, adjust suitable beam incident angle, and adjustment reflected light connects
The position of receiving portions, the hot spot for reflecting next on glass is all projected into lens, through data collecting system acquisition process, uses ear
Machine can successfully listen to the audio frequency vibration signal that audio amplifier is sent or the vibration signal extracted using oscillograph observation.
The foregoing is only presently preferred embodiments of the present invention, all equivalent changes done according to scope of the present invention patent with
Modification, it should all belong to the covering scope of the present invention.
Claims (5)
1. the vibration signal extraction element based on gradual change transmitance filter, it is characterised in that including：Laser, gradual change transmitance
Filter, convex lens, photoelectric sensor and data collecting system；
The laser launches laser beam to the optical reflection face of vibrating body to be measured, and the reflected light of formation, which passes sequentially through, coaxially to be set
The gradual change transmitance filter and convex lens put；Then it is arranged on the optical sensor at concave lens focus to receive, optical sensor is defeated
The signal gone out is gathered by data collecting system.
2. the vibration signal extraction element according to claim 1 based on gradual change transmitance filter, it is characterised in that described
Photoelectric sensor includes photoelectric tube, pre-amplification circuit, low-pass filter circuit and the second amplifying circuit being sequentially connected.
3. the vibration signal extraction element according to claim 1 based on gradual change transmitance filter, it is characterised in that along anti-
Light direction is penetrated, a bandpass filter is set before the gradual change transmitance filter.
4. the vibration signal extraction element according to claim 1 based on gradual change transmitance filter, it is characterised in that described
Laser is 650nm 5mW semiconductor laser module.
5. the vibration signal extraction element according to claim 1 based on gradual change transmitance filter, it is characterised in that described
Gradual change transmitance filter model ND8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201711019078.8A CN107560713A (en) | 2017-10-27 | 2017-10-27 | Vibration signal extraction element based on gradual change transmitance filter |
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| CN201711019078.8A CN107560713A (en) | 2017-10-27 | 2017-10-27 | Vibration signal extraction element based on gradual change transmitance filter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113932907A (en) * | 2021-09-18 | 2022-01-14 | 南京信息工程大学 | Object vibration frequency detection method |
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