CN112924388B - Orthogonal double-channel acoustic resonance device - Google Patents
Orthogonal double-channel acoustic resonance device Download PDFInfo
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- CN112924388B CN112924388B CN202110087822.8A CN202110087822A CN112924388B CN 112924388 B CN112924388 B CN 112924388B CN 202110087822 A CN202110087822 A CN 202110087822A CN 112924388 B CN112924388 B CN 112924388B
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- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/1702—Systems in which incident light is modified in accordance with the properties of the material investigated with opto-acoustic detection, e.g. for gases or analysing solids
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- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
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Abstract
The utility model provides an orthogonal binary channels acoustic resonance device, resonance device includes the square, and first side and second side are the adjacent side of square, be provided with the first chamber unit that passes first side and its opposite face on the square, pass the second chamber unit of second side and its opposite face, first chamber unit includes first resonant cavity and symmetrical coaxial first buffer chamber and the second buffer chamber that set up at first resonant cavity both ends, the second chamber unit includes second resonant cavity and symmetrical coaxial third buffer chamber and the fourth buffer chamber that set up at resonant cavity both ends, the intersection zone that first resonant cavity and second resonant cavity center formed is provided with the acoustic pipe of perpendicular to two resonant cavity constitution planes, be provided with acoustic sensor on the other end of acoustic pipe. The invention realizes the double-channel synchronous measurement, simultaneously provides multiplied detection sensitivity, and increases the sampling flow of the measurement system, thereby greatly expanding the applicable range.
Description
Technical Field
The invention relates to the technical field of atmospheric environmental pollutant monitoring, in particular to an orthogonal double-channel acoustic resonance device.
Background
Photoacoustic spectroscopy is a spectroscopic technique based on the photoacoustic effect, the basic principle being that sample particles absorb periodic light energy to generate weak pressure waves, i.e. acoustic waves. In photoacoustic spectroscopy, weak acoustic signals of the acoustic resonant cavity are usually utilized for amplification, so that the detection sensitivity and detection limit can be effectively improved through good structural design of the acoustic resonant cavity. Such as a three-channel acoustic resonant cavity photoacoustic spectrum sensing device announced in 2017, 6 and 12 of Chinese patent No. 104697933B. The invention adopts three mutually parallel acoustic resonant cavities as absorption channels of three different light absorption components, three light sources generate acoustic signals through the acoustic resonant cavities, and the acoustic signals are transmitted to a microphone for detection through three acoustic guide pipes connected to the middle points of the acoustic resonant cavities. Although the three resonant cavities can realize multi-wavelength multi-component trace gas absorption detection, the detection sensitivity of a single component and a single wavelength is not improved. With the development of the field of atmospheric detection, in particular the detection of weakly absorbing components.
Disclosure of Invention
In order to further improve the detection sensitivity and the detection limit, the invention provides an orthogonal two-channel acoustic resonance device, which comprises the following specific scheme:
the orthogonal double-channel acoustic resonance device comprises a square block, wherein a first side surface and a second side surface are adjacent side surfaces of the square block, a first cavity unit penetrating through the first side surface and the opposite side surface of the square block, a second cavity unit penetrating through the second side surface and the opposite side surface of the square block are arranged on the square block, the first cavity unit comprises a first resonant cavity and a first buffer chamber and a second buffer chamber which are symmetrically and coaxially arranged at two ends of the first resonant cavity, the second cavity unit comprises a second resonant cavity and a third buffer chamber and a fourth buffer chamber which are symmetrically and coaxially arranged at two ends of the resonant cavity, an intersection area formed by the centers of the first resonant cavity and the second resonant cavity is provided with an acoustic conduit which is perpendicular to a plane formed by the two resonant cavities, and the other end of the acoustic conduit is provided with an acoustic sensor.
Preferably, the acoustic sensor is a microphone or a tuning fork.
Preferably, four holes which are respectively communicated with the buffer chambers are formed in the upper surface of the square, the holes in the first buffer chamber and the third buffer chamber are used as sample injection holes, the holes in the second buffer chamber and the fourth buffer chamber are sample discharge holes, the outer end parts of the first buffer chamber and the third buffer chamber are used as incident windows, and the outer end parts of the second buffer chamber and the fourth buffer chamber are used as emergent windows.
Preferably, the sample inlet hole can be used for inputting gas or aerosol particles.
Preferably, the incident window and the emergent window are respectively provided with a window piece.
Preferably, the diameter range of the first resonant cavity and the second resonant cavity is 2-4 times of the diameter of the laser beam.
Preferably, the length L1 of the first resonant cavity is equal to the length L2 of the second resonant cavity, the first resonant cavity, the second resonant cavity and Lmin are equal to each other, wherein l1=l2=l, lmin < L < Lmax, l=c/2f, C is the sound velocity, fmin=1000 Hz, fmax=20000 Hz, and the length h=l/2 of the four buffer chambers is 2-4 times the diameter of the resonant cavities.
Preferably, the method further comprises the steps of,
a laser assembly for generating a beam of light that is transmitted toward the entrance window;
the beam splitting component is used for splitting the light beam emitted by the laser component into two beams and respectively transmitting the two beams to the two incident windows;
and the phase-locked amplifier is connected with the output end of the acoustic sensor and the output end of the control signal source and is used for receiving the reference signal provided by the control signal source and demodulating the photoacoustic spectrum signal in the corresponding resonant cavity perceived by the acoustic sensor.
Preferably, the laser assembly comprises a control signal source, a laser controller and a laser which are sequentially arranged according to the light path.
Preferably, the beam splitting assembly comprises a half-transparent mirror, a first plane mirror and a second plane mirror, wherein the beam of the laser is divided into a first beam and a second beam through the center of the half-transparent mirror, the first beam coincides with the central axis of the first cavity unit, and the second beam sequentially enters the second cavity unit after being reflected by the first plane mirror and the second plane mirror and coincides with the central axis of the second cavity unit.
The invention has the beneficial effects that: the invention adds a second channel acoustic resonance device on the basis of a single channel acoustic resonance device, and each acoustic resonance device independently realizes resonance amplification of an acoustic signal and reaches a maximum sound pressure at the center of a cavity. The two acoustic modules are placed in an orthogonalization mode, and the time of light passing through acoustic resonance of the two channels is far smaller than the thermal relaxation time of gas molecules or aerosol particles, so that acoustic signals respectively generated by the two acoustic resonance devices can be approximately considered to be generated at the same moment, superposition of the acoustic signals after two resonance amplification can be realized at the intersection point, the doubled detection sensitivity is provided, the sampling flow of a measuring system is increased, and the application range of the measuring system is greatly expanded.
Drawings
Fig. 1 is a schematic structural diagram of a spectrum sensing device including an orthogonal dual channel acoustic resonator device according to the present invention.
Fig. 2 is a cross-sectional view of a resonant device.
Fig. 3 is a perspective view of the first and second chamber units.
Fig. 4 is a graph showing the eigenfrequency distribution of a dual cavity in a resonant device.
Fig. 5 is a graph of pressure profile of a dual cavity in a resonant device at 1742Hz resonance frequency.
Fig. 6 is a frequency response diagram of a resonant device.
The description of the components in the drawings is as follows:
11. a function signal generator; 12. a laser controller, 13, a laser; 21. a half-mirror; 22. a first planar mirror; 23. a second planar mirror; 31. a square block; 321. a first resonant cavity; 322. a first buffer chamber; 323. a second buffer chamber; 331. a second resonant cavity; 332. a third buffer chamber; 333. a fourth buffer chamber; 34. a sample inlet; 35. a sample outlet hole; 36. a window pane; 37. an acoustic duct; 4. an acoustic sensor; 5. a phase-locked amplifier; 61. a first detector; 62. a second detector; 7. and (3) a PC.
Detailed Description
Example 1
As shown in fig. 1-4, an orthogonal two-channel acoustic resonator device includes a square block 31, where a first cavity unit passing through a second side and an opposite side of the square block 31 and a second cavity unit passing through a first side and an opposite side of the square block 31 are disposed on the square block 31, and the first side and the second side are adjacent sides of the square block 31. The first cavity unit comprises a first resonant cavity 321, a first buffer chamber 322 and a second buffer chamber 323 which are symmetrically and coaxially arranged at two ends of the first resonant cavity 321, the second cavity unit comprises a second resonant cavity 331, a third buffer chamber 332 and a fourth buffer chamber 333 which are symmetrically and coaxially arranged at two ends of the second resonant cavity 331, an intersection area formed by the centers of the first resonant cavity 321 and the second resonant cavity 331 is provided with a sound guide pipe 37 which is perpendicular to a plane formed by the two resonant cavities, and the other end of the sound guide pipe 37 is provided with an acoustic sensor 4. The acoustic sensor 4 is a microphone or a tuning fork.
Four holes which are respectively communicated with the buffer chambers are formed in the upper surface of the square block 31, the holes in the first buffer chamber 322 and the third buffer chamber 332 are used as sample injection holes 34, the holes in the second buffer chamber 323 and the fourth buffer chamber 333 are sample discharge holes 35, the outer end parts of the first buffer chamber 322 and the third buffer chamber 332 are used as incident windows, and the outer end parts of the second buffer chamber 323 and the fourth buffer chamber 333 are used as emergent windows.
Optimally, the gas molecules or aerosol particles can be input into the sample inlet 34, and in this embodiment, a concentration sensor is arranged at the sample inlet 34 and/or the sample outlet 35, so as to detect the concentration of the material entering and exiting the sample inlet 34 and/or the sample outlet 35. In this embodiment, the sample inlet 34 and the sample outlet 35 are provided with concentration sensors.
The entrance window and the exit window are both provided with window sheets 36, so as to form a closed environment, and reduce the interference of external environment noise on measurement.
The length L1 of the first resonant cavity 321 is equal to the length L2 of the second resonant cavity 331. The first resonant cavity 321, the second resonant cavity 331, and the buffer chamber are as follows: l1=l2=l, lmin < L < Lmax, l=c/2f, C is the speed of sound, fmin=1000 Hz, fmax=20000 Hz, four buffer chamber lengths h=l/2, buffer chamber diameters being 2-4 times the resonator diameter. In this embodiment, the first resonator 321 and the second resonator 331 are each l=c/2000 Hz long and have a diameter that is 2 times the diameter of the laser spot.
The first resonator 321 and the second resonator 331 each have a diameter in the range of 2-4 laser spot diameters, and in this embodiment, the first resonator 321 and the second resonator 331 each have a diameter that is 2 laser spot diameters.
Example 2
The difference from embodiment 1 is that the length of the first resonant cavity 321 and the second resonant cavity 331 in this embodiment is l=c/4000 Hz, and the diameter is 4 times the diameter of the laser spot. The buffer chamber diameter is 4 times the resonator diameter.
Example 3
The difference from embodiment 1 is that the length of the first resonant cavity 321 and the second resonant cavity 331 in this embodiment is l=c/3000 Hz, the diameter is 3 times of the diameter of the laser spot, and the diameter of the buffer chamber is 3 times of the diameter of the resonant cavity.
Example 4
As shown in fig. 4, a spectrum sensing device including the orthogonal two-channel acoustic resonance device in any one of embodiments 1, 2, and 3 further includes
A laser assembly for transmitting a light beam to an entrance window; the laser assembly comprises a control signal source, a laser controller 12, a laser 13, which in this embodiment is a function signal generator 11, arranged in the light path in that order. The light output by the laser 13 is pulsed light or modulated (mechanically chopped or modulated by an electrical signal) continuous light.
The beam splitting component is used for splitting the light beam emitted by the laser component into two beams and respectively transmitting the two beams to the two incident windows; the beam splitting assembly comprises a half mirror 21, a first plane mirror 22 and a second plane mirror 23, wherein the beam of the laser 13 is divided into a first beam and a second beam through the center of the half mirror 21, the first beam coincides with the central axis of the first cavity unit, and the second beam sequentially enters the second cavity unit after being reflected by the first plane mirror 22 and the second plane mirror 23 and coincides with the central axis of the second cavity unit.
And the phase-locked amplifier 5 is connected with the output end of the acoustic sensor 4 and the output end of the control signal source and is used for receiving the reference signal provided by the control signal source and demodulating the photoacoustic spectrum signal in the corresponding resonant cavity perceived by the acoustic sensor 4.
The device further comprises a first detector 61 and a second detector 62, said first detector 61 and second detector 62 respectively corresponding to receiving the light beam corresponding to the exit window.
The output ends of the first detector 61, the second detector 62 and the lock-in amplifier 5 are connected with the PC7, and data are uploaded to the PC7 for analysis.
The resonant frequencies at which both acoustic resonator devices exist are shown in fig. 4, and it can be seen from fig. 4 that only at 1742Hz resonant frequency, the same sound pressure distribution as shown in fig. 5 occurs for both acoustic resonator devices. When two acoustic resonators resonate at 1742Hz at the same time, the two identical sound pressure distributions cause the sound pressures to be superimposed at the intersection of the two resonators. By scanning the cavity frequency, it can be seen that optimal acoustic signal amplification is achieved only at 1742Hz as shown in fig. 6.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (6)
1. The orthogonal double-channel acoustic resonance device is characterized by comprising a square block (31), wherein a first side surface and a second side surface are adjacent side surfaces of the square block (31), a first cavity unit penetrating through the first side surface and the opposite side surface of the square block (31) and a second cavity unit penetrating through the second side surface and the opposite side surface of the square block are arranged on the square block (31), the first cavity unit comprises a first resonant cavity (321) and a first buffer chamber (322) and a second buffer chamber (323) which are symmetrically and coaxially arranged at two ends of the first resonant cavity (321), the second cavity unit comprises a second resonant cavity (331) and a third buffer chamber (332) and a fourth buffer chamber (333) which are symmetrically and coaxially arranged at two ends of the resonant cavity, an intersection area formed by the centers of the first resonant cavity (321) and the second resonant cavity (331) is provided with an acoustic guide pipe (37) which is perpendicular to the two resonant cavities to form a plane, and the other end of the acoustic guide pipe (37) is provided with an acoustic sensor (4); the acoustic sensor (4) is a microphone;
the length L1 of the first resonant cavity (321) is equal to the length L2 of the second resonant cavity (331), the first resonant cavity (321) and the second resonant cavity (331) are equal, wherein L1=L2=L, lmin < L < Lmax, L=C/2 f, C is sound velocity, fmin=1000 Hz, fmax=20000 Hz, the length H=L/2 of four buffer chambers is 2-4 times the diameter of the resonant cavities;
further comprises: a laser assembly for generating a beam of light that is transmitted toward the entrance window;
the beam splitting component is used for splitting the light beam emitted by the laser component into two beams and respectively transmitting the two beams to the two incident windows;
and the phase-locked amplifier (5) is connected with the output end of the acoustic sensor (4) and the output end of the control signal source and is used for receiving the reference signal provided by the control signal source and demodulating the photoacoustic signal in the corresponding resonant cavity perceived by the acoustic sensor (4).
2. The orthogonal dual-channel acoustic resonance device according to claim 1, wherein four holes which are respectively communicated with the buffer chambers are formed in the upper surface of the square block (31), the holes in the first buffer chamber (322) and the third buffer chamber (332) are used as sample injection holes (34), the holes in the second buffer chamber (323) and the fourth buffer chamber (333) are used as sample outlet holes (35), the outer end parts of the first buffer chamber (322) and the third buffer chamber (332) are used as incident windows, and the outer end parts of the second buffer chamber (323) and the fourth buffer chamber (333) are used as emergent windows.
3. The orthogonal two-channel acoustic resonator device according to claim 2, characterized in that a louver (36) is provided on both the entrance window and the exit window.
4. The orthogonal dual channel acoustic resonator device of claim 1, wherein the first resonator (321) and the second resonator (331) have diameters that are 2-4 times the laser beam diameter.
5. The orthogonal dual channel acoustic resonator device of claim 1, wherein the laser assembly comprises a control signal source, a laser controller (12), and a laser (13) arranged in order in the optical path.
6. The orthogonal dual-channel acoustic resonance device according to claim 5, wherein the beam splitting assembly comprises a half mirror (21), a first plane mirror (22) and a second plane mirror (23), the beam of the laser (13) is split into a first beam and a second beam through the center of the half mirror (21), the first beam coincides with the central axis of the first cavity unit, and the second beam sequentially enters the second cavity unit after being reflected by the first plane mirror (22) and the second plane mirror (23) and coincides with the central axis of the second cavity unit.
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| CN113109268B (en) * | 2021-05-25 | 2022-07-01 | 武汉理工大学 | Photoacoustic spectroscopy enhancement apparatus and method for gas detection using the same |
| CN116773455B (en) * | 2023-08-18 | 2023-11-21 | 之江实验室 | Dual resonant sensor device and method |
| CN116879179B (en) * | 2023-09-07 | 2023-11-14 | 武汉格蓝若智能技术股份有限公司 | Differential photoacoustic cell for multi-component gas measurement |
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