CN215865468U - Sound field visualization-based sound velocity measurement device - Google Patents
Sound field visualization-based sound velocity measurement device Download PDFInfo
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- CN215865468U CN215865468U CN202121754661.5U CN202121754661U CN215865468U CN 215865468 U CN215865468 U CN 215865468U CN 202121754661 U CN202121754661 U CN 202121754661U CN 215865468 U CN215865468 U CN 215865468U
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Abstract
The utility model provides a sound velocity measurement device based on sound field visualization, which comprises an ultrasonic generator, a concave reflector, a dual-channel signal generator, an LED lamp and a receiving terminal, wherein the ultrasonic generator and the LED lamp are respectively connected with the dual-channel signal generator, and the ultrasonic generator, the LED lamp and the receiving terminal are all arranged in front of the mirror surface of the concave reflector through a support. The ultrasonic wave reflection and diffraction demonstration instrument is simple and reasonable in structure, low in cost and good in using effect, the visualization of an ultrasonic field is realized through the V-shaped reflection type schlieren light path, the reflection and the diffraction of sound waves can be simply and visually demonstrated, and the ultrasonic wave length can be rapidly measured and calculated.
Description
Technical Field
The utility model belongs to the technical field of acoustooptic, and particularly relates to a sound velocity measurement device based on sound field visualization.
Background
An acoustic wave is a mechanical wave that propagates in an elastic medium. Because the transmission of the acoustic wave field is closely related to factors such as the elastic modulus of the medium, the density and the composition of the fluid, the temperature of the environment and the like, monitoring related parameters of the acoustic wave field in the medium, such as sound velocity, sound field distribution, sound pressure and the like, has important significance for acoustic application technology. At present, the main methods for measuring the sound velocity include a standing wave method, a phase comparison method, a transit time method and the like. These methods essentially receive an ultrasonic signal by an ultrasonic receiver, and calculate the velocity of the acoustic wave by the position of the ultrasonic receiver relative to the ultrasonic generator and the time of receiving the acoustic wave. In the prior art, the distribution of the sound field is unknown. When sound waves propagate in transparent liquid, gas or solid medium optical media, although the amplitude transmittance distribution of these objects is uniform, the spatial distribution of the refractive index thereof is not uniform due to the modulation of the acoustic wave field, forming a particular phase object. Since the human eye or a conventional photodetector can only distinguish the change of the light intensity (light field amplitude) and cannot judge the change of the phase, the phase object cannot be seen, i.e. the parts with different thicknesses or refractive indexes in the phase object cannot be distinguished. Therefore, if the sound field distribution in the phase object can be observed and the sound velocity measurement can be realized, the method is an important beneficial supplement to the sound field characterization and sound velocity measurement method. The schlieren optical imaging technology is an effective detection means for sound field distribution in a transparent medium. Because sound pressure changes the density of the medium when sound waves propagate in a phase object, thereby changing the refractive index of the sound waves, the schlieren technique can utilize the refractive index distribution in the medium to convert the refractive index distribution into light intensity distribution, and further reflect the density distribution in the medium to represent the distribution of the sound wave field. There are many reports of sound field imaging using schlieren technology. However, in these works, two kinds of schlieren imaging systems are mainly used to image the sound field. One is a schlieren system based on a transmission-type 4f system, and the other is a reflection-type schlieren system based on a Z-type optical path (shadow method). The two schlieren systems are built, on one hand, more optical lenses are needed, and on the other hand, the light path building and adjusting are complex. Therefore, it is necessary to design a simple device system which is easy to set up, has low cost and can visualize the sound wave.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that the sound velocity measuring device based on sound field visualization is provided aiming at the defects of the prior art, the device is simple and reasonable in structure, few in component and low in cost, can form a V-shaped schlieren light path, can visually and conveniently realize demonstration of sound wave reflection, diffraction and the like, can directly measure ultrasonic wave length through a visual image of a sound wave field, further calculates the sound velocity, is good in using effect, and can improve the efficiency of sound velocity measurement in a test.
In order to solve the technical problems, the utility model adopts the technical scheme that: the utility model provides a sound velocity measuring device based on sound field visualization, its characterized in that, includes ultrasonic generator, concave surface speculum, binary channels signal generator, LED lamp and receiving terminal, ultrasonic generator and LED lamp are respectively through two interface connection of wire with binary channels signal generator, the concave surface speculum passes through the vertical setting of mirror surface support, ultrasonic generator, LED lamp and receiving terminal are respectively through the mirror surface the place ahead of support setting at the concave surface speculum, distance between LED lamp and receiving terminal and the concave surface speculum is the twice focus of concave surface speculum. The distance between the ultrasonic generator and the concave reflector is 5 cm.
Preferably, the LED lamp is a white LED lamp, a light source incident direction of the LED lamp faces the mirror surface of the concave reflector, and the receiving terminal is a smart phone or a semiconductor photosensitive element.
Preferably, the ultrasonic frequency emitted by the ultrasonic generator is 40KHz, the aperture of the concave reflector is 203mm, and the focal length is 800 mm.
Compared with the prior art, the utility model has the following advantages:
1. the utility model has simple and reasonable structure, few components, convenient assembly and low cost, can form a V-shaped schlieren light path, can visually and conveniently realize demonstration of sound wave reflection, diffraction and the like, can directly measure ultrasonic wave length through a visual image of a sound wave field so as to calculate sound velocity, and has good use effect.
2. Compared with other schlieren experiment devices, the schlieren experiment device has the advantages that the structure is simpler, a professional camera is not needed, knife edge filtering is not needed, only the function of a camera of a personal mobile phone is utilized in experiment teaching demonstration, the adjustment of a 4f system is avoided more easily by adjusting a light path, required elements are cheap and easy to obtain, the schlieren experiment device is easy to implement in teaching research, related contents of optics and acoustics are combined, on one hand, the schlieren experiment device can be used as a demonstration experiment combining sound and light, and on the other hand, the schlieren experiment device can be used as an expansion supplement of experiment contents of sound velocity measurement.
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Drawings
FIG. 1 is a schematic diagram of the device architecture of the present invention.
Description of reference numerals:
1-a concave mirror; 2-an ultrasonic generator; 3-a two-channel signal generator;
4-LED lamps; 5-a receiving terminal; 6-conducting wire.
Detailed Description
As shown in fig. 1, the ultrasonic diagnosis device comprises an ultrasonic generator 2, a concave reflector 1, a dual-channel signal generator 3, an LED lamp 4 and a receiving terminal 5, wherein the ultrasonic generator 2 and the LED lamp 4 are respectively connected with two interfaces of the dual-channel signal generator 3 through leads 6, the concave reflector 1 is vertically arranged through a mirror bracket, the ultrasonic generator 2, the LED lamp 4 and the receiving terminal 5 are respectively arranged in front of the mirror surface of the concave reflector 1 through brackets, and the distance between the LED lamp 4 and the receiving terminal 5 and the concave reflector 1 is twice the focal length of the concave reflector 1. The minimum distance between the ultrasonic generator and the concave reflecting mirror is 5 cm.
In this embodiment, the LED lamp 4 is a white LED lamp, the incident direction of the light source of the LED lamp 4 is opposite to the mirror surface of the concave reflector 1, and the receiving terminal 5 is a smart phone or a semiconductor photosensitive element.
In this embodiment, the ultrasonic frequency emitted by the ultrasonic Generator 2 is 40KHz, the aperture of the concave reflecting mirror 1 is 203mm, the focal length is 800mm, and the dual-channel signal Generator 3 preferably uses an ultrasonic Generator with a brand name of rig Function/orbit wave Generator DG 1022U.
When the LED lamp is used, the output frequency of one channel of the dual-channel signal generator 3 connected with the LED lamp 4 is adjusted to 40KHz, and the voltage output is adjusted to 5.8V; the ultrasonic generator 2 is connected into the other channel of the dual-channel signal generator 3, the output frequency of the channel is adjusted to 40KHz, and the voltage output is amplified to 100V. The position of the LED lamp 4 is adjusted (adjusted left and right and up and down), so that the light spot position reflected and focused by the concave reflector 1 is as high as the LED lamp 4; the receiving terminal 5 is arranged near a light spot, the lens of the receiving terminal 5 is aligned to the concave reflector 1, and the position of the receiving terminal 5 is adjusted to enable the light spot of the LED lamp 4 to enter the lens of the receiving terminal 5; starting a shooting function of the receiving terminal 5, slowly adjusting the position of the receiving terminal 5, and enabling uniform light spots of the LED lamp 4 to fill the whole image of the concave reflector 1 in a display screen of the receiving terminal 5; because the binary channels signal generator 3 provides LED lamp 4 with the drive frequency of ultrasonic generator 2 is 40KHz, according to the stroboscopic principle can see the spatial distribution of stable ultrasonic field on receiving terminal 5's the display screen, namely realizes the visualization of ultrasonic field. When the driving frequency of the LED lamp 4 is more than 40KHz, the ultrasonic wave shadow image on the display screen of the receiving terminal 5 is in a recovery state, namely the ultrasonic wave moves at a constant speed towards the direction of an ultrasonic source; when the frequency of the LED lamp 4 is less than 40KHz, the ultrasonic wave shadow image on the display screen of the receiving terminal 5 is in an outward-surging state, namely the ultrasonic wave moves at a constant speed in a direction away from the ultrasonic source. Therefore, the driving frequency difference between the ultrasonic generator 2 and the LED lamp 4 is changed, and the fluctuation of the ultrasonic field can be demonstrated very intuitively. The reflection and diffraction of the ultrasonic field can be visually seen on the display screen of the receiving terminal 5 by placing a metal reflecting surface or a slit with proper width in front of the ultrasonic generator 2.
By using the shooting function of the receiving terminal 5, an ultrasonic schlieren image of the ultrasonic generator 2 can be obtained. The size of an ultrasonic generator and the ultrasonic distance in a shot picture, namely the pixel length corresponding to the corresponding physical quantity, can be directly measured by using a ruler tool of a drawing program in a Photoshop or windows operating system.
Table 1: size measuring meter for pixel map ultrasonic generator
Table 2: ultrasonic distance measuring meter for pixel map
Pixel height of ultrasonic generator
Node mean spacing of an ultrasound field
According to the actual height d of the ultrasonic generator0Using the proportional relation of 11.0mm
The node spacing (i.e., wavelength) λ of the actual ultrasound field can be determined to be 8.49 mm. The sound speed experimental value v is 339.60m/s according to the relation of frequency f, wavelength λ and sound speed v. According to theoretical formula
Wherein v is0Is T0Speed of sound at 273.15K, v0331.45m/s, T (T/° c +273.15) K. The laboratory temperature is 25 ℃ during the experiment, and the theoretical value of the sound velocity is calculated to be 346.20 m/s. The relative error of the sound velocity measured by the device is 2.0%.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention in any way. Any simple modifications, alterations and equivalent changes made to the above embodiments according to the technical essence of the present invention are still within the scope of the technical solution of the present invention.
Claims (3)
1. The utility model provides a sound velocity measuring device based on sound field visualization, its characterized in that, includes ultrasonic generator (2), concave surface speculum (1), binary channels signal generator (3), LED lamp (4) and receiving terminal (5), ultrasonic generator (2) and LED lamp (4) are respectively through two output interface connection of wire (6) with binary channels signal generator (3), concave surface speculum (1) is through the vertical setting of mirror surface support, ultrasonic generator (2), LED lamp (4) and receiving terminal (5) are respectively through the mirror surface the place ahead of support setting at concave surface speculum (1), distance between LED lamp (4) and receiving terminal (5) and concave surface speculum (1) is the twice focus of concave surface speculum (1).
2. The sound velocity measurement device based on sound field visualization according to claim 1, wherein the LED lamp (4) is a white LED lamp, a light source incident direction of the LED lamp (4) is directly opposite to the mirror surface of the concave reflecting mirror (1), and the receiving terminal (5) is a smart phone or a semiconductor photosensitive element.
3. The sound velocity measurement device based on sound field visualization according to claim 1, wherein the ultrasonic frequency emitted by the ultrasonic generator (2) is 40KHz, the aperture of the concave reflector (1) is 203mm, and the focal length is 800 mm.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115290175A (en) * | 2022-10-08 | 2022-11-04 | 天津大学 | Sea water sound velocity measuring device and method and ocean distance measuring system |
| CN115950518A (en) * | 2023-03-15 | 2023-04-11 | 天津大学 | Sound velocity measuring device, sound velocity measuring device detection method and storage medium |
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2021
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115290175A (en) * | 2022-10-08 | 2022-11-04 | 天津大学 | Sea water sound velocity measuring device and method and ocean distance measuring system |
| CN115290175B (en) * | 2022-10-08 | 2022-12-20 | 天津大学 | Sea water sound velocity measuring device and method and ocean distance measuring system |
| CN115950518A (en) * | 2023-03-15 | 2023-04-11 | 天津大学 | Sound velocity measuring device, sound velocity measuring device detection method and storage medium |
| CN115950518B (en) * | 2023-03-15 | 2023-05-26 | 天津大学 | Sound velocity measuring device, sound velocity measuring device detection method and storage medium |
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