CN112304415B - Diffuse reflection type double-light-path air vibration detection system and method - Google Patents
Diffuse reflection type double-light-path air vibration detection system and method Download PDFInfo
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- CN112304415B CN112304415B CN202011190131.2A CN202011190131A CN112304415B CN 112304415 B CN112304415 B CN 112304415B CN 202011190131 A CN202011190131 A CN 202011190131A CN 112304415 B CN112304415 B CN 112304415B
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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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
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Abstract
The invention discloses a diffuse reflection type double-light-path air vibration detection system, which utilizes the basic principle that the pushing deformation formed on the surface of a flexible object and the time difference (phase difference) existing at different positions in the air vibration process of a detection area and utilizes a double-light-beam mode to carry out differential detection on two points which are very close to each other so as to obtain the approximate time derivative of vibration, realize the detection of the differential property of vibration displacement, and then recover the original signal by using an integral mode so as to effectively restore the waveform of the original air vibration; the invention eliminates a series of interference factors such as instability of a light source, interference in a light transmission process and the like in a double-beam mode, and realizes efficient and stable detection of air vibration.
Description
Technical Field
The invention belongs to the technical field of laser measurement of air vibration, and particularly relates to a diffuse reflection type double-light-path air vibration detection system and method.
Background
With the progress of industry, various vibration detection technologies are developed vigorously, and among them, detection technologies based on the principle of laser interference are becoming mature. However, the detection of weak air vibration is limited by factors such as air flow, surface optical property difference, and coherence length limitation, and thus the practicability is very poor. In recent years, along with the rigor of public safety and national safety situation, urgent needs for voice monitoring are provided, and particularly, in the aspect of remote voice detection and monitoring, the needs are very rigid, but up to now, equipment with convenient installation and good use effect has high technical difficulty and is difficult to realize, and particularly, the reduction of interference signals of channels such as wind, temperature gradient and the like on a laser propagation channel is very difficult.
The current relevant research and patent situations are as follows:
the invention discloses an optical frequency type metering and testing device (CN201110053568.6) for a laser vibration meter, relates to an optical frequency type metering and testing device for a laser vibration meter, belongs to the technical field of metering of laser vibration meters, and aims to simulate the stable working state of the laser vibration meter by using a spectrum modulation mode to solve the problem that a high-speed vibration meter cannot be used for metering.
The invention discloses a method (CN201010585429.3) for detecting sound field parameters in a liquid medium by using a laser vibration meter, which discloses a method for detecting the sound field parameters in the liquid medium by using the laser vibration meter; the invention utilizes the reflection characteristic of the liquid surface and the deflection of the reflected light to carry out the liquid surface vibration test, and belongs to the application of the laser reflection type vibration measurement technology in the sound field measurement in the liquid.
The invention discloses an all-fiber laser Doppler three-dimensional vibration meter (CN201110385923. X). The invention patent utilizes a multi-frequency-doppler effect test component to respectively test the vibration in the X, Y, Z direction and carry out vibration synthesis, thereby realizing the detection of three-dimensional vibration.
A laser detector (CN201120315331.6) for voice information features that a Doppler heterodyne interference vibrometer is used, a telescopic system and a subsequent voice processing system are used, and the format conversion from vibration signal to voice signal and the voice output are realized.
Laser excitation vibration meter (CN99251921.7), this utility model patent adopt the excitation light beam as pumping light and sample interact, utilize the light acousto-optic thermal effect to stimulate out the sound wave on the sample, carry out the beam splitting interference vibration measurement at the light beam that utilizes vibration measurement to the realization is the optoacoustic detection module of a kind of area excitation source to the detection of sound wave signal, its essence.
As described above, various documents and data that can be referred to have a variety of techniques for detecting object vibration caused by air vibration, but these inventions are classified into reflection type and interference type physical approaches and partially use the doppler effect, and these inventions do not pay attention to the characteristics of the vibration source itself, and thus, the inspection of vibration cannot be performed using these characteristics.
Disclosure of Invention
Aiming at the defects in the prior art, the diffuse reflection type double-optical-path air vibration detection system and the diffuse reflection type double-optical-path air vibration detection method solve the problem that accurate air vibration detection is difficult to realize because the characteristics of a vibration source, such as instability and interference factors in a light propagation process, are not considered in the existing air vibration detection process.
In order to achieve the purpose of the invention, the invention adopts the technical scheme that: a diffuse reflection type double-light-path air vibration detection system comprises an infrared laser, an infrared collimating mirror, an infrared 45-degree semi-transparent semi-reflecting mirror, a first infrared 45-degree reflecting mirror, a flexible object, an infrared transmitting optical filter, a second infrared 45-degree reflecting mirror, an infrared convex lens, an infrared detector, a digital oscilloscope and a vibration signal post-processor;
infrared light emitted by the infrared laser sequentially passes through the infrared collimating mirror and the infrared 45-degree semi-transparent semi-reflective mirror, projected light of the infrared 45-degree semi-transparent semi-reflective mirror irradiates to a point B of the flexible object, reflected light of the infrared 45-degree semi-transparent semi-reflective mirror irradiates to a point A of the flexible object after being reflected by the first infrared 45-degree reflective mirror, and the point A and the point B on the flexible object are transmitted in the reverse direction along an incident path and then sequentially pass through the infrared transmitting filter, the second infrared 45-degree reflective mirror and the infrared convex lens; the point A and the point B are points at two different positions on the flexible object, and the reflected light from the first infrared 45-degree reflector to the point A is parallel to the projected light from the infrared 45-degree half-transmitting and half-reflecting mirror to the point B;
the focus of the convex lens falls on the detection surface of the infrared detector, and the infrared detector, the digital oscilloscope and the vibration signal post-processor are sequentially connected.
Furthermore, the line connecting the optical center of the infrared collimating mirror and the optical center of the infrared 45-degree half-transmitting half-reflecting mirror is a line segment l1The line connecting the optical center of the second infrared 45-degree reflector and the optical center of the infrared convex lens is a line segment l2The line connecting the optical center of the first infrared 45-degree reflector, the optical center of the infrared 45-degree semi-transparent semi-reflective mirror, the optical center of the infrared transmitting filter and the optical center of the second infrared 45-degree reflector is a line segment l3；
The line segment l1And line segment l2Parallel to said line segment l3And is vertical.
Further, 45 infrared half mirror, first infrared 45 speculum and the infrared 45 speculum of second are all personally submitted 45 contained angles and are parallel to each other with the level, it is parallel to the horizontal plane setting to pass through infrared filter.
Further, the infrared 45-degree half-transmitting and half-reflecting mirror performs 50% transmission and 50% reflection processing on the received infrared light.
Further, the flexible object is an object which can vibrate under the driving of an air vibration signal and has easily detected amplitude.
Furthermore, the infrared detector is used for collecting light energy of infrared light reflected by the infrared convex lens, converting the light energy into a corresponding electric signal and transmitting the electric signal to the digital oscilloscope;
the digital oscilloscope is used for receiving the electric signal transmitted by the infrared detector, generating a corresponding waveform signal and transmitting the waveform signal to the vibration signal post-processor;
the vibration signal post processor is a computer with Matlab software and is used for amplifying, filtering, denoising and integrating the waveform signals transmitted by the received digital oscilloscope, obtaining signals capable of reflecting the waveform characteristics of the air vibration signals and realizing air vibration detection.
A diffuse reflection type double-light-path air vibration detection method comprises the following steps:
s1, emitting infrared light through an infrared laser, collimating the infrared light by an infrared collimating mirror to form parallel light beams, and emitting the parallel light beams to an infrared 45-degree semi-transparent semi-reflecting mirror;
s2, performing transmission and reflection processing on the parallel light beams through an infrared 45-degree semi-transparent semi-reflecting mirror, transmitting the transmission light obtained through the transmission processing to a point B of the flexible object, and reflecting the reflection light obtained through the reflection processing to irradiate the point A of the flexible object after being reflected by a first infrared 45-degree reflecting mirror;
s3, vibration signal S (t) generated by driving on point A and point B on the flexible object based on air vibration signal S (t)A) And S (t)B) The diffuse reflection light on the point A and the point B reversely propagates along the incident path respectively, and is converged to an infrared detector after sequentially passing through an infrared transmission filter, a second infrared 45-degree reflector and an infrared convex lens;
s4, converting the converged infrared light signals into electric signals through an infrared detector, and sending the electric signals to a digital oscilloscope;
s5, processing the received electric signals through a digital oscilloscope to obtain corresponding waveform signals and transmitting the waveform signals to a vibration signal post processor;
and S6, processing the received waveform signal through the vibration signal post processor to obtain a signal S' (t) capable of reflecting the waveform characteristics of the air vibration signal S (t), and realizing air vibration signal detection.
Further, in step S2, the infrared light emitted by the infrared laser is split by the infrared collimator, the infrared 45 ° half mirror, and the first infrared 45 ° reflector, and two parallel lights obtained by splitting are respectively irradiated to the point a and the point B of the flexible object, and the direct distance between the two parallel lights is d.
Further, the air vibration signal S (t) in the step S3 includes a human voice signal, an ambient sound signal, and a machine vibration signal.
Further, in step S6, the vibration signal post-processor performs processing on the received waveform signal, including amplification, filtering, denoising, and integration processing.
The invention has the beneficial effects that:
(1) the invention utilizes the basic principle that the pushing deformation formed on the surface of a flexible object and the time difference (phase difference) existing at different positions in the air vibration process of a detection area and utilizes a double-beam mode to carry out differential detection on two points which are very close to each other, thereby obtaining the approximate time derivative of vibration, realizing the detection of the differential property of vibration displacement, and then recovering the original signal by using an integral mode to effectively restore the waveform of the original air vibration;
(2) the invention eliminates a series of interference factors such as instability of a light source, interference in a light transmission process and the like in a double-beam mode, and realizes efficient and stable detection of air vibration.
Drawings
Fig. 1 is a schematic structural diagram of a diffuse reflection type dual-optical-path air vibration detection system in the present invention.
Fig. 2 is a flow chart of a diffuse reflection type double-light-path air vibration detection method in the present invention.
Wherein: 1. an infrared laser; 2. an infrared collimating mirror; 3. a first infrared 45 ° mirror; 4. an infrared 45-degree semi-transparent and semi-reflective mirror; 5. an infrared-transmitting filter; 6. a second infrared 45 ° mirror; 7. an infrared convex lens; 8. an infrared detector; 9. a digital oscilloscope; 10. a vibration signal post processor; 11. a flexible object.
Detailed Description
The following description of the embodiments of the present invention is provided to facilitate the understanding of the present invention by those skilled in the art, but it should be understood that the present invention is not limited to the scope of the embodiments, and it will be apparent to those skilled in the art that various changes may be made without departing from the spirit and scope of the invention as defined and defined in the appended claims, and all matters produced by the invention using the inventive concept are protected.
Example 1:
the method utilizes the time sequence characteristic of the vibration of the voice signal in the air when the vibration propagates on the surface of the flexible object, combines the double-optical-path heterodyne detection technology to obtain a first-order differential signal of the voice vibration signal, and finally restores the voice vibration signal through time integration.
Based on the principle, the diffuse reflection type dual-optical-path air vibration detection system in the embodiment of the invention is shown in fig. 1 and comprises an infrared laser 1, an infrared collimating mirror 2, an infrared 45-degree semi-transparent semi-reflecting mirror 4, a first infrared 45-degree reflecting mirror 3, a flexible object 11, an infrared transmission optical filter 5, a second infrared 45-degree reflecting mirror 6, an infrared convex lens 7, an infrared detector 8, a digital oscilloscope 9 and a vibration signal post-processor 10;
infrared light emitted by the infrared laser 1 sequentially passes through the infrared collimating mirror 2 and the infrared 45-degree semi-transparent and semi-reflective mirror 4, projected light of the infrared 45-degree semi-transparent and semi-reflective mirror 4 irradiates to a point B of the flexible object 11, reflected light of the infrared 45-degree semi-transparent and semi-reflective mirror 4 irradiates to a point A of the flexible object 11 after being reflected by the first infrared 45-degree reflective mirror 3, and the point A and the point B on the flexible object 11 are reversely transmitted along an incident path and sequentially pass through the infrared light transmitting filter 7, the second infrared 45-degree reflective mirror 6 and the infrared convex lens 8; the point A and the point B are points at two different positions on the flexible object 11, and the reflected light from the first infrared 45-degree reflector 3 to the point A is parallel to the projected light from the infrared 45-degree half-mirror 4 to the point B; the convex infrared lens 7 is arranged right behind the second infrared 45-degree reflector 6, the focus of the convex infrared lens 7 falls on the detection surface of the infrared detector 8, and the infrared detector 8, the digital oscilloscope 9 and the vibration signal post-processor 10 are sequentially connected;
wherein, the laser wavelength emitted by the infrared laser 1 is infrared light which is invisible to naked eyes; the infrared 45-degree half-transmitting and half-reflecting mirror 4 performs 50% transmission and 50% reflection treatment on the received infrared light; the infrared-transmitting filter 5 can achieve a high transmittance for the laser wavelength, while the mirror is opaque for other light rays deviating from the laser wavelength to determine accurate air vibration detection; the convex lens 7 can realize the focusing function aiming at the laser wavelength, and the focusing focus of the convex lens is on the detection surface of the infrared detector 8.
In order to ensure the accurate reflection of the infrared signal, the line connecting the optical center of the infrared collimating mirror 2 and the optical center of the infrared 45 degree half-transmitting half-reflecting mirror 4 in this embodiment is a line segment l1The line connecting the optical center of the second infrared 45-degree reflector 6 and the optical center of the infrared convex lens 7 is a line segment l2The line connecting the optical center of the first infrared 45 degree reflector 3, the optical center of the infrared 45 degree half-transmitting half-reflecting mirror 4, the optical center of the infrared transmitting filter 5 and the optical center of the second infrared 45 degree reflector 6 is a line segment l3(ii) a Line segment l1And line segment l2Parallel to the line segment l3Vertically; the infrared 45-degree semi-transparent and semi-reflective mirror 4, the first infrared 45-degree reflective mirror 3 and the second infrared 45-degree reflective mirror 6 form 45-degree included angles with the horizontal plane and are parallel to each other, and the infrared transmitting filter 5 is arranged in parallel to the horizontal plane.
In this embodiment, the flexible object 11 is an object that can vibrate under the driving of the air vibration signal and whose amplitude is easy to detect, thereby realizing air vibration detection.
The infrared detector 8 in this embodiment is used for collecting light energy of infrared light reflected by the convex infrared lens 7, converting the light energy into a corresponding electrical signal, and transmitting the electrical signal to the digital oscilloscope 9, and the detection sensitivity is high; the digital oscilloscope 9 is used for receiving the electric signals transmitted by the infrared detector 8, generating corresponding waveform signals and transmitting the waveform signals to the vibration signal post-processor 10, and can store some waveforms for a long time and comprehensively analyze some waveforms stored by the digital oscilloscope; the vibration signal post-processor 10 is a computer with Matlab software, and is used for performing amplification, filtering, noise reduction and integration processing on a waveform signal transmitted by the received digital oscilloscope 9 to obtain a signal capable of reflecting the waveform characteristics of the air vibration signal, so as to realize air vibration detection.
The signal S' (t) output by the detection system can accurately reflect the air vibration signal S (t) received when the flexible object 11 receives the vibration of the reflected light point, so that the air vibration detection is realized, wherein the air vibration signal comprises a human voice signal, an environment sound signal and a machine vibration signal.
Example 2:
as shown in fig. 2, this embodiment provides a method for implementing diffuse reflection type dual optical path air vibration detection based on the above detection system, including the following steps:
s1, emitting infrared light through an infrared laser, collimating the infrared light by an infrared collimating mirror to form parallel light beams, and emitting the parallel light beams to an infrared 45-degree semi-transparent semi-reflecting mirror;
s2, performing transmission and reflection processing on the parallel light beams through an infrared 45-degree semi-transparent semi-reflecting mirror, transmitting the transmission light obtained through the transmission processing to a point B of the flexible object, and reflecting the reflection light obtained through the reflection processing to irradiate the point A of the flexible object after being reflected by a first infrared 45-degree reflecting mirror;
s3, vibration signal S (t) generated by driving on point A and point B on the flexible object based on air vibration signal S (t)A) And S (t)B) Make points A and B diffuseReflected light respectively reversely propagates along an incident path and is converged to an infrared detector after sequentially passing through an infrared transmission filter, a second infrared 45-degree reflector and an infrared convex lens;
s4, converting the converged infrared light signals into electric signals through an infrared detector, and sending the electric signals to a digital oscilloscope;
s5, processing the received electric signals through a digital oscilloscope to obtain corresponding waveform signals and transmitting the waveform signals to a vibration signal post processor;
and S6, processing the received waveform signal through the vibration signal post processor to obtain a signal S' (t) capable of reflecting the waveform characteristics of the air vibration signal S (t), and realizing air vibration signal detection.
In step S2, the infrared light emitted by the infrared laser is split by the infrared collimator, the infrared 45 ° half-mirror and the first infrared 45 ° reflector to obtain two parallel lights, which are respectively irradiated to the point a and the point B of the flexible object, and the direct distance between the two parallel lights is d. The flexible object for receiving the optical signal can vibrate under the driving of the air vibration signal and has easily detected amplitude. S (t) in FIG. 1B) And S (t)A) The components of the air vibration signal S (t) received by the point A and the point B of the flexible object respectively have different time sequences, and respectively correspond to the time tAAnd tB(ii) a In addition, points a ' and B ' in the figure are respectively corresponding virtual images, S ' (t), formed after the points a and B on the flexible object are used as scattering light sources and are reflected by the infrared 45-degree half-transmitting mirror and the first infrared 45-degree reflectorA) And S' (t)B) I.e. the vibration signal at the corresponding virtual image point.
The air vibration signal S (t) in the above step S3 includes a human voice signal, an ambient sound signal, and a machine vibration signal.
The processing of the received waveform signal by the vibration signal post-processor in step S6 includes amplification, filtering, denoising, and integration processing, and specifically, the vibration signal post-processor is a computer with Matlab software, and amplifies, filters, and denoises the waveform image obtained by the digital oscilloscope, and then integrates the denoised waveform image with the integration function in Matlab to obtain a signal S' (t).
In the description of the present invention, it is to be understood that the terms "center", "thickness", "upper", "lower", "horizontal", "top", "bottom", "inner", "outer", "radial", "square" and "rear" etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or an implicit indication of the number of technical features. Thus, features defined as "first", "second", "third" may explicitly or implicitly include one or more of the features.
Claims (10)
1. A diffuse reflection type double-light-path air vibration detection system is characterized by comprising an infrared laser (1), an infrared collimating mirror (2), an infrared 45-degree semi-transmitting semi-reflecting mirror (4), a first infrared 45-degree reflecting mirror (3), a flexible object (11), an infrared transmitting optical filter (5), a second infrared 45-degree reflecting mirror (6), an infrared convex lens (7), an infrared detector (8), a digital oscilloscope (9) and a vibration signal post-processor (10);
infrared light emitted by the infrared laser (1) sequentially passes through the infrared collimating mirror (2) and the infrared 45-degree half-transmitting and half-reflecting mirror (4), the infrared light irradiates to a point B of the flexible object (11) through projection light of the infrared 45-degree half-transmitting and half-reflecting mirror (4), reflected light of the infrared 45-degree half-transmitting and half-reflecting mirror (4) irradiates to a point A of the flexible object (11) after being reflected by the first infrared 45-degree reflecting mirror (3), and the point A and the point B on the flexible object (11) are reversely transmitted along an incident path and then sequentially pass through the infrared filter (5), the second infrared 45-degree reflecting mirror (6) and the infrared convex lens (7); the point A and the point B are points at two different positions on the flexible object (11), and the reflected light from the first infrared 45-degree reflector (3) to the point A is parallel to the projected light from the infrared 45-degree semi-transparent and semi-reflective mirror (4) to the point B;
the focus of the infrared convex lens (7) is located on the detection surface of the infrared detector (8), and the infrared detector (8), the digital oscilloscope (9) and the vibration signal post-processor (10) are sequentially connected.
2. A diffuse reflection type double light path air vibration detection system according to claim 1, characterized in that the line connecting the optical center of the infrared collimator lens (2) and the optical center of the infrared 45 ° half mirror (4) is a line segment l1The line connecting the optical center of the second infrared 45-degree reflector (6) and the optical center of the infrared convex lens (7) is a line segment l2The line connecting the optical center of the first infrared 45-degree reflector (3), the optical center of the infrared 45-degree semi-transparent semi-reflective mirror (4), the optical center of the infrared transmitting filter (5) and the optical center of the second infrared 45-degree reflector (6) is a line segment l3；
The line segment l1And line segment l2Parallel to said line segment l3And is vertical.
3. A diffuse reflection type dual-light path air vibration detection system according to claim 1, wherein the infrared 45 ° half mirror (4), the first infrared 45 ° reflecting mirror (3) and the second infrared 45 ° reflecting mirror (6) form an included angle of 45 ° with the horizontal plane and are parallel to each other, and the infrared transmission filter (5) is disposed parallel to the horizontal plane.
4. A diffuse reflection type dual optical path air vibration detection system according to claim 1, wherein said infrared 45 ° half mirror (4) is 50% transmissive and 50% reflective to the received infrared light.
5. A diffusely reflective dual optical path airborne vibration detection system according to claim 1, wherein the flexible object (11) is an object capable of vibrating upon actuation by an airborne vibration signal and having an amplitude that is easily detectable.
6. A diffusely reflective dual optical path airborne vibration detection system according to claim 1,
the infrared detector (8) is used for collecting light energy of infrared light reflected by the infrared convex lens (7), converting the light energy into a corresponding electric signal and transmitting the electric signal to the digital oscilloscope (9);
the digital oscilloscope (9) is used for receiving the electric signal transmitted by the infrared detector (8), generating a corresponding waveform signal and transmitting the waveform signal to the vibration signal post-processor (10);
the vibration signal post-processor (10) is a computer with Matlab software and is used for amplifying, filtering, denoising and integrating the waveform signals transmitted by the receiving digital oscilloscope (9) to obtain signals capable of reflecting the waveform characteristics of the air vibration signals and realize air vibration detection.
7. A diffuse reflection type double-light-path air vibration detection method is characterized by comprising the following steps:
s1, emitting infrared light through an infrared laser, collimating the infrared light by an infrared collimating mirror to form parallel light beams, and emitting the parallel light beams to an infrared 45-degree semi-transparent semi-reflecting mirror;
s2, performing transmission and reflection processing on the parallel light beams through an infrared 45-degree semi-transparent semi-reflecting mirror, transmitting the transmission light obtained through the transmission processing to a point B of the flexible object, and reflecting the reflection light obtained through the reflection processing to irradiate the point A of the flexible object after being reflected by a first infrared 45-degree reflecting mirror;
s3, vibration signal S (t) generated by driving on point A and point B on the flexible object based on air vibration signal S (t)A) And S (t)B) The diffuse reflection light on the point A and the point B reversely propagates along the incident path respectively, and is converged to an infrared detector after sequentially passing through an infrared transmission filter, a second infrared 45-degree reflector and an infrared convex lens;
s4, converting the converged infrared light signals into electric signals through an infrared detector, and sending the electric signals to a digital oscilloscope;
s5, processing the received electric signals through a digital oscilloscope to obtain corresponding waveform signals and transmitting the waveform signals to a vibration signal post processor;
and S6, processing the received waveform signal through the vibration signal post processor to obtain a signal S' (t) capable of reflecting the waveform characteristics of the air vibration signal S (t), and realizing air vibration signal detection.
8. The method according to claim 7, wherein in step S2, the infrared light emitted from the infrared laser is split by the infrared collimator, the infrared 45 ° half mirror and the first infrared 45 ° reflector to obtain two parallel beams, and the two parallel beams are respectively irradiated to the point a and the point B of the flexible object, and the direct distance between the two parallel beams is d.
9. A diffuse reflection type double optical path air vibration detection method according to claim 7, wherein said air vibration signal S (t) in step S3 includes human voice signal, environmental sound signal and machine vibration signal.
10. The diffuse reflection type dual optical path air vibration detection method according to claim 7, wherein in step S6, the vibration signal post-processor processes the received waveform signal including amplification, filtering, denoising and integration.
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