CN109374117A - Sound measurement device and method based on sense sound striped film - Google Patents
Sound measurement device and method based on sense sound striped film Download PDFInfo
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- CN109374117A CN109374117A CN201811569906.XA CN201811569906A CN109374117A CN 109374117 A CN109374117 A CN 109374117A CN 201811569906 A CN201811569906 A CN 201811569906A CN 109374117 A CN109374117 A CN 109374117A
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- striped
- film
- sound
- sense sound
- sense
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H9/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means
Abstract
The present invention relates to a kind of sound measurement devices and method based on sense sound striped film, the device includes sense sound striped film, optical lens group, image-forming module, image processing module and computer, method includes the following steps: single density striped is attached to film surface center, sense sound striped film is formed；It is installed on immediately ahead of the sense sound striped film of film substrate and is handled by optical lens group, and utilize fixed supporting frame fixed imaging module, by adjusting optical lens group, so that the clear-cut texture of film surface images in face battle array imaging sensor center；When sound wave reaches sense sound striped film, film can generate vibration, then carry out real-time continuous imaging to striped by image-forming module and be transferred in computer, image processing module is by seeking the variable density of stripe pattern, to obtain the vibration information of sense sound striped film, and then obtain acoustic information.
Description
Technical field
The present invention relates to machine vision sound measurement technical fields, and in particular to a kind of sound based on sense sound striped film
Measuring device and method.
Background technique
Currently, sound measurement technology is mainly carried out by way of microphone sensor, most of microphones are all stayed
Electret condenser microphone (ECM), this technology have had the history of decades.Microphone is to pass to Mike by the vibration of sound
On the vibrating diaphragm of wind, the magnet of the inside is pushed to form the electric current of variation, the electric current changed in this way is sent to subsequent sound treatment circuit
Amplify processing.And the most commonly used is Electret Condencer Microphones and dynamic microphones two major classes for microphone.Electrostatic microphone is
Using the variation of capacitance size, electric signal is converted by voice signal.When acoustic diaphragm is vibrated or by air-flow is rubbed
When wiping, since vibration changes the distance between two-plate, i.e., capacitor changes, and electricity is constant, will cause the variation of voltage, electricity
The size of buckling reflects the power of extraneous acoustic pressure, and this voltage change frequency reflects the frequency of external sound, here it is
The working principle of electret microphone.Another dynamic microphones are to be made into using electromagnetic induction principle, are existed using coil
In magnetic field, voice signal is converted electric signal by cutting magnetic induction line.
Vibrating membrane is attached to one piece of metal polar plate of microphone sensor by traditional sound measurement, with another block of metal
Between pole plate, forms one and be similar to capacitance sensor or utilize electromagnetic induction principle, by the vibration information of vibrating membrane, by sound
Sound signal is converted into electric signal, and not only structure is complicated, at high cost, and has higher material requirement to the substrate of vibrating membrane.
Summary of the invention
In view of this, the purpose of the present invention is to provide a kind of sound measurement device based on sense sound striped film and sides
Method realizes the measurement to sound based on a kind of sense sound striped film, and measuring device is simple, and measurement efficiency is high.
To achieve the above object, the present invention adopts the following technical scheme:
A kind of sound measurement device based on sense sound striped film, including sense sound striped film, film substrate, optical lens group,
Image-forming module, fixed supporting frame, computer and image processing module；The sense sound striped film is installed in film substrate；Institute
Optical lens group is stated to be installed on to the sense sound striped film front, to handle it；The image-forming module utilizes
Fixed supporting frame is fixed, to carry out real-time continuous imaging to striped and be transmitted to computer by data communication line；The figure
As processing module is set in computer, the variable density seek stripe pattern to the stripe pattern is handled；
The computer is to control the image-forming module and image processing module, and to the stripe pattern for being transmitted to computer
Signal carries out processing analysis.
Further, the sense sound striped film is by stripe design in film surface center, such as can be passed through
Striped is attached to film surface by vacuum aluminum-coated or laser aluminum spraying technique, and front is stripe pattern, and the back side is without striped.
Further, the striped of sense sound striped film surface center is period fixed single density striped, item
Line intensity changes along the length direction of sense sound striped film at single density, constant in the width direction, and length is equal with width.
Further, the striped of sense sound striped film surface center is length and width is the square of 10mm
Shape.
Further, the film substrate is the cylindrical tube shape for having through-hole；The sense sound striped film by large washer and
Screw is fixed in film substrate, and striped is fixed in through-hole periphery by small washer and screw.
Further, the image-forming module is that sampling frame per second can be adjusted according to the frequency of sense sound striped vibration of thin membrane
High-speed camera.
Further, the sound measurement method of a kind of sound measurement device based on sense sound striped film, it is special
Sign is, comprising the following steps:
Step S1: the setting of single density striped is formed into sense sound striped film in film surface center, and is installed on film base
Seat.
Step S2: being handled immediately ahead of sense sound striped film by optical lens group, and utilizes fixed supporting frame fixed imaging
Module, by adjusting optical lens group, so that the clear-cut texture of sense sound striped film surface images in the face battle array of optical lens group
Imaging sensor center.
Step S3: when sound wave reaches sense sound striped film, film can generate vibration, then by image-forming module to striped
It carries out real-time continuous imaging and is transferred in computer.
Step S4: computer seeks the striped of every frame single density stripe pattern central row by image processing module, uses
Spectrum Correction technology is corrected to obtain the variable density information that striped changes over time to fringe frequency, and the sense of access sound striped is thin
Vibration of membrane information.
Further, the time domain shift vibration signal of the sense sound striped filmRelationship are as follows:
WhereinIt is sense sound striped film in the displacement of t moment, D is optical lens group and sense sound striped film surface striped
Between imaging object distance,For t moment face battle array imaging sensor in stripe pattern density,For stripe pattern
The density of reference frame;Imaging object distance D between the optical lens group and sense sound striped film surface striped, relationship
Are as follows:
WhereinFor imaging len focal length,For the imaging scale factor, can state are as follows:
WhereinIt can pass throughIt calculates and obtains,aFor face battle array imaging sensor single pixel point width,For
The pixel sum of sense sound striped film surface striped covering.
Compared with the prior art, the invention has the following beneficial effects:
(1) present invention only need to design striped in sense sound striped film surface center, and the measurement to sound can be realized.
(2) sense sound striped film of the invention is able to achieve simple, accurate and efficiently measures to sound.
(3) sense sound striped film design of the invention is simple and low in cost, substantially increases the measurement effect to sound
Rate.
Detailed description of the invention
Fig. 1 is the apparatus structure schematic diagram of the embodiment of the present invention.
Fig. 2 is sense sound striped film design and fixed schematic diagram in the embodiment of the present invention.
Fig. 3 is the imaging geometry figure of image-forming module in the embodiment of the present invention.
In figure, 1- computer, 2- data communication line, 3- image-forming module (high-speed camera), 4- fixed supporting frame, 5- optics
Lens group, 6- film substrate, 7- sense sound striped film, 8- striped, the face 9- battle array imaging sensor (CCD).
Specific embodiment
The present invention will be further described with reference to the accompanying drawings and embodiments.
Fig. 1 is please referred to, the present invention provides the apparatus structure schematic diagram that Fig. 1 is the embodiment of the present invention.As shown in Figure 1, this reality
It applies example and a kind of sound measurement device based on sense sound film, including computer 1, image-forming module 3, optical lens group 5, sense sound is provided
Striped 8 is attached to film surface center, forms sense sound striped film 7, and be installed in film substrate 6 by striped film 7,
To perceive acoustic information；Optical lens group 5 is installed on 7 front of sense sound striped film and leads to handle striped 8
Adjustment optical lens group 5 is crossed, so that 8 blur-free imaging of striped on 7 surface of sense sound striped film is in face battle array 9 centre bit of imaging sensor
It sets；Image-forming module 3 is fixed using fixed supporting frame 4, and when sound wave reaches sense sound striped film 7, film can generate vibration, then
Real-time continuous imaging is carried out to striped 8 by image-forming module 3 and computer 1 is transmitted to by data communication line 2.Computer 1 is used
To control figure image-forming module 3 and image processing module, and 8 image of striped by seeking being transmitted to computer 1 is close
Degree variation to obtain the vibration information of sense sound striped film 7, and then obtains acoustic information.
As shown in Fig. 2, sense sound striped film 7 is that striped 8 is attached to film surface center, front is that the period is fixed
8 image of single density striped, the back side is without striped, and the striped 8 is located at 7 side of sense sound striped film for being attached to pedestal, wherein item
Line 8 is length and width is the rectangle of 10mm.And sense sound striped film 7 is installed in film substrate 6, film diameter and pedestal
Diameter is consistent, is fixed by large washer and screw, and film substrate 6 is the cylindrical tube shape for having through-hole, and the width and through-hole of striped 8 are straight
Diameter is consistent, and fixed in through-hole periphery by small washer and screw, to increase the fundamental frequency of the vibration of sense sound striped film 7.
As shown in figure 3, image-forming module 3 is to sample frame per second to be adjusted according to the frequency that sense sound striped film 7 vibrates
High-speed camera is mainly made of face battle array imaging sensor 9 and optical lens group 5.High-speed camera is set to optical lens
5 front of group, by adjusting optical lens group 5, so that 8 blur-free imaging of striped on 7 surface of sense sound striped film is imaged in face battle array
9 center of sensor.When sound wave reaches sense sound striped film 7, film can generate vibration, then right by image-forming module 3
Striped 8 carries out real-time continuous record by imaging.The time domain shift vibration signal of sense sound striped filmRelationship are as follows:
WhereinIt is sense sound striped film in the displacement of t moment, D is optical lens group and sense sound striped film surface striped
Between imaging object distance,For t moment face battle array imaging sensor in stripe pattern density,For stripe pattern
The density of reference frame;Imaging object distance D between the optical lens group and sense sound striped film surface striped, relationship
Are as follows:
WhereinFor imaging len focal length,For the imaging scale factor, can state are as follows:
WhereinIt can pass throughIt calculates and obtains,aFor face battle array imaging sensor single pixel point width,For
The pixel sum of sense sound striped film surface striped covering.
The foregoing is merely presently preferred embodiments of the present invention, all equivalent changes done according to scope of the present invention patent with
Modification, is all covered by the present invention.
Claims (8)
1. a kind of sound measurement device based on sense sound striped film, it is characterised in that: including sense sound striped film, film base
Seat, optical lens group, image-forming module, fixed supporting frame, computer and image processing module；The sense sound striped film is installed on
In film substrate；The optical lens group is installed on to the sense sound striped film front, to handle it；It is described
Image-forming module is fixed using fixed supporting frame, to carry out real-time continuous imaging to striped and be transmitted to meter by data communication line
Calculation machine；Described image processing module is set in computer, seeks the close of stripe pattern to carry out to the stripe pattern
Spend change process；The computer is calculated to control the image-forming module and image processing module, and to being transmitted to
The stripe pattern signal of machine carries out processing analysis.
2. the sound measurement device according to claim 1 based on sense sound striped film, it is characterised in that: the sense sound item
Line film is by stripe design in film surface center, and striped is attached to film by vacuum aluminum-coated or laser aluminum spraying technique
Surface, front are stripe pattern, and the back side is without striped.
3. the sound measurement device according to claim 1 based on sense sound striped film, it is characterised in that: the sense sound item
The striped of line film surface center is period fixed single density striped, and fringe intensity is along the length side of sense sound striped film
Change at single density, it is constant in the width direction, and length is equal with width.
4. the sound measurement device according to claim 3 based on sense sound striped film, it is characterised in that: the sense sound item
The striped of line film surface center is length and width is the rectangle of 10mm.
5. the sound measurement device according to claim 2 based on sense sound striped film, it is characterised in that: the film base
Seat is the cylindrical tube shape for having through-hole；The sense sound striped film is fixed in film substrate by large washer and screw, and item
Line is fixed in through-hole periphery by small washer and screw.
6. the sound measurement device according to claim 1 based on sense sound striped film, it is characterised in that: the imaging mould
Block is the high-speed camera that samples frame per second and can be adjusted according to the frequency of sense sound striped vibration of thin membrane.
7. a kind of sound measurement method of sound measurement device based on sense sound striped film according to claim 2,
It is characterized in that, comprising the following steps:
Step S1: the setting of single density striped is formed into sense sound striped film in film surface center, and is installed on film base
Seat;
Step S2: being handled immediately ahead of sense sound striped film by optical lens group, and utilizes fixed supporting frame fixed imaging module,
By adjusting optical lens group, so that the face battle array imaging that the clear-cut texture of sense sound striped film surface images in optical lens group passes
Sensor center;
Step S3: when sound wave reaches sense sound striped film, film can generate vibration, then be carried out by image-forming module to striped
Real-time continuous imaging is simultaneously transferred in computer;
Step S4: computer seeks the striped of every frame single density stripe pattern central row by image processing module, using frequency spectrum
Alignment technique is corrected to obtain the variable density information that striped changes over time to fringe frequency, the sense of access sound striped film
Vibration information.
8. a kind of sound measurement method of sound measurement device based on sense sound striped film according to claim 7,
It is characterized in that: the time domain shift vibration signal of the sense sound striped filmRelationship are as follows:
WhereinIt is sense sound striped film in the displacement of t moment, D is optical lens group and sense sound striped film surface striped
Between imaging object distance,For t moment face battle array imaging sensor in stripe pattern density,For stripe pattern
The density of reference frame;Imaging object distance D between the optical lens group and sense sound striped film surface striped, relationship
Are as follows:
WhereinFor imaging len focal length,For the imaging scale factor, can state are as follows:
WhereinIt can pass throughIt calculates and obtains,aFor face battle array imaging sensor single pixel point width,For
The pixel sum of sense sound striped film surface striped covering.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201811569906.XA CN109374117A (en) | 2018-12-21 | 2018-12-21 | Sound measurement device and method based on sense sound striped film |
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| CN201811569906.XA CN109374117A (en) | 2018-12-21 | 2018-12-21 | Sound measurement device and method based on sense sound striped film |
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ID=65371097
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| CN201811569906.XA Pending CN109374117A (en) | 2018-12-21 | 2018-12-21 | Sound measurement device and method based on sense sound striped film |
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| CN111323111A (en) * | 2020-03-11 | 2020-06-23 | 北京空间飞行器总体设计部 | Modal test system suitable for film antenna under vacuum environment |
| CN112683382A (en) * | 2020-12-31 | 2021-04-20 | 福州大学 | Structure three-dimensional vibration measurement system and method based on monocular vision |
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Cited By (3)
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Application publication date: 20190222 |
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