CN109342323B - Device and method for eliminating interference of external vibration on photoacoustic cell - Google Patents
Device and method for eliminating interference of external vibration on photoacoustic cell Download PDFInfo
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- CN109342323B CN109342323B CN201811338401.2A CN201811338401A CN109342323B CN 109342323 B CN109342323 B CN 109342323B CN 201811338401 A CN201811338401 A CN 201811338401A CN 109342323 B CN109342323 B CN 109342323B
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- 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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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
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Abstract
The invention relates to a device and a method for eliminating interference of external vibration on a photoacoustic cell. The device comprises a concave groove, a panel, a first elastic element, a second elastic element and a third elastic element; one end of the first elastic element is fixed on the bottom plate of the concave groove and is vertical to the bottom plate, the other end of the first elastic element is connected with the panel, and the panel is positioned in the concave groove and is parallel to the bottom plate; the second elastic element and the third elastic element are both positioned above the panel and are both parallel to the panel, and the second elastic element and the third elastic element are vertical to each other; one end of the second elastic element is fixedly connected to the inner wall of the concave groove, and the other end of the second elastic element is connected with a first positioning lining arranged on the panel; one end of the third elastic element is fixedly connected to the inner wall of the concave groove, and the other end of the third elastic element is connected with a second positioning bushing arranged on the panel. By adjusting the pretightening force of each elastic device, the device keeps a mechanical balance state, and the interference of external vibration on a detection signal is counteracted.
Description
Technical Field
The invention relates to the field of anti-interference devices, in particular to a device and a method for eliminating interference of external vibration on a photoacoustic cell.
Background
The photoacoustic effect is that a monochromatic light beam with adjustable intensity is irradiated on a sample sealed in a photoacoustic cell, the sample absorbs light energy and is excited in a mode of releasing thermal energy, and the released thermal energy enables the sample and surrounding media to generate periodic heating according to the modulation frequency of the light, so that the media generate periodic pressure fluctuation. Such pressure fluctuations may be detected by a sound sensitive element, such as a sensitive microphone or piezo ceramic microphone, and amplified to obtain a photoacoustic signal.
The photoacoustic spectroscopy technology is a novel spectral analysis detection technology based on the photoacoustic effect. The photoacoustic spectroscopy technique does not directly measure the spectrum itself, but acquires spectral information by detecting an acoustic wave thermally excited by a substance after absorbing radiation.
The photoacoustic spectrometer based on the photoacoustic spectroscopy technology is suitable for measuring low-concentration samples. The photoacoustic cell is used as a core component in a photoacoustic spectrometer, and is a container for a gas sample and a carrier of an acoustic sensing element. In the working and running process of the photoacoustic spectrometer, external vibration can generate sound waves, the sound waves can interfere and influence detection signals in the photoacoustic cell, and particularly the sound waves with the same frequency as the detection signals have more influence on detection results.
Disclosure of Invention
In view of the problems in the prior art, the present invention aims to provide an anti-interference device, which can be applied to the photoacoustic spectroscopy technology to eliminate the interference of external vibration on the detection signal of the photoacoustic cell.
The invention provides a device for eliminating interference of external vibration on a photoacoustic cell, which comprises a concave groove, a panel, a first elastic element, a second elastic element and a third elastic element, wherein the concave groove is formed in the panel;
one end of the first elastic element is fixed on the bottom plate of the concave groove and is vertical to the bottom plate, the other end of the first elastic element is connected with the panel, and the panel is positioned in the concave groove and is parallel to the bottom plate;
the second elastic element and the third elastic element are both parallel to the panel and are perpendicular to each other;
one end of the second elastic element is fixedly connected to the inner wall of the concave groove, and the other end of the second elastic element is connected with a first positioning bushing arranged on the panel;
one end of the third elastic element is fixedly connected to the inner wall of the concave groove, and the other end of the third elastic element is connected with a second positioning bushing arranged on the panel.
As an optional embodiment of the present invention, the first elastic element, the second elastic element, and the third elastic element are all springs.
As an optional embodiment of the present invention, the first elastic element, the second elastic element, and the third elastic element are all provided in plurality, so that the panel is in a mechanical equilibrium state.
As an alternative embodiment of the present invention, the second elastic element and the third elastic element are located at four corners of the concave groove.
Further, the second elastic element and the third elastic element are arranged at each corner of the concave groove in pairs.
As an alternative embodiment of the invention, said first elastic element is connected to said panel by means of an adjusting screw.
As an alternative embodiment of the present invention, the second elastic element is connected to the first positioning bushing by an adjusting screw.
As an alternative embodiment of the present invention, the third spring device is connected to the second positioning bushing through an adjusting screw.
The invention also provides a system for eliminating the interference of the external vibration on the photoacoustic cell, which comprises the device for eliminating the interference of the external vibration on the photoacoustic cell, the photoacoustic cell and the vibration signal acquisition device, wherein the photoacoustic cell and the vibration signal acquisition device are arranged on the panel.
When the system is interfered by external vibration, the first elastic element, the second elastic element and the third elastic element are adjusted to enable the system to reach a mechanical balance state, so that the interference of the external vibration on a detection signal in the photoacoustic cell is counteracted.
In the device capable of eliminating the interference of the external vibration on the photoacoustic cell, the elastic devices with proper number and positions are arranged, so that the anti-interference device can be kept in a mechanical balance state, the mechanical balance state of the anti-interference device is kept by adjusting the pretightening force of the elastic devices when the device is interfered by the external vibration, and when objects such as the photoacoustic cell are placed on the device, the interference of the external vibration on the acoustic wave signals of the photoacoustic cell can be counteracted by adjusting the elastic devices.
The system for eliminating the interference of the external vibration on the photoacoustic cell can be applied to an online monitoring instrument in a cabinet, and the accuracy of a monitoring result is effectively improved.
Drawings
Fig. 1 is a schematic structural diagram of an apparatus for eliminating interference of external vibration on a photoacoustic cell according to the present invention.
Fig. 2 is a schematic cross-sectional view of section C-C in fig. 1.
Detailed Description
The following detailed description of the present invention, taken in conjunction with the accompanying drawings and examples, is provided to enable the invention and its various aspects and advantages to be better understood. However, the specific embodiments and examples described below are for illustrative purposes only and are not limiting of the invention.
The invention firstly provides a device which can eliminate the interference of external vibration on a photoacoustic cell, and the device is also called an anti-interference device in the invention. As shown in fig. 1, the tamper-resistant device of the present invention includes a concave groove 1, a panel 2, a first elastic element 31, a second elastic element 32, and a third elastic element 33. Fig. 1 is a schematic diagram of a tamper-resistant device according to an embodiment of the present invention, where positions and numbers of the first elastic element 31, the second elastic element 32, and the third elastic element 33 are not limited, and may be adjusted according to actual needs in different embodiments of the present invention, so that the panel 2 can maintain a mechanically balanced state.
Fig. 2 is a schematic cross-sectional view of the cross-section C-C in fig. 1. As can be seen from fig. 2, in the present invention, one end of the first elastic element 31 is fixedly connected to the bottom plate of the concave groove 1. And, the first elastic element 31 and the bottom plate are arranged perpendicular to each other. The other end of the first elastic element 31 is connected with the panel 2, and the panel 2 is positioned in the groove 1, and the panel 2 is parallel to the bottom plate of the groove 1.
Alternatively, the first elastic element 31 is a spring. In different embodiments of the present invention, different elastic elements can be selected according to actual needs.
Furthermore, the first elastic element 31 is a conical compression spring, and the thicker end of the section of the conical compression spring is connected with the bottom plate of the concave groove 1.
Alternatively, the connection between the first elastic element 31 and the panel 2 is realized by means of an adjusting screw 6. Further, by adjusting the degree of tightness of the adjusting screw 6, the first elastic element 31 is compressed or released.
As shown in fig. 1 and 2, the second elastic element 32 and the third elastic element 33 are both parallel to the panel 2. And the second elastic element 32 and the third elastic element 33 are perpendicular to each other. Optionally, the second elastic element 32 and the third elastic element 33 are both located above the panel 2, so as to adjust the pre-tightening force of the second elastic element 32 and the third elastic element 33.
From fig. 2, one end of the second elastic element 32 is fixedly connected to the inner wall of the concave groove 1, and the other end is connected to the first positioning bush 4 arranged on the panel 2, so as to realize the connection between the second elastic element 32 and the panel 2. Wherein, the position of the first positioning bush 4 is vertical to the bottom plate of the concave groove 1.
Optionally, the second elastic element 32 is connected with the first positioning bushing 4 through an adjusting screw 6, so that the second elastic element 32 is stretched or shortened by adjusting the tightness degree of the adjusting screw 6.
Optionally, a gasket 5 is further disposed between the second elastic element 32 and the first positioning bushing 4, and the second elastic element 32, the gasket 5, and the first positioning bushing 4 are sequentially fixed on the panel 2 by an adjusting screw 6, so as to connect the second elastic element 32 and the panel 2. The provision of the spacer 5 makes the fixed connection between the second elastic element 32 and the first positioning bush 4 more stable and durable.
Further, one end of the third elastic element 33 is fixedly connected to the inner wall of the recess groove 1, and the other end is connected to a second positioning bush provided on the panel 2. In the present invention, the connection manner between the third elastic element 33 and the panel 2 is the same as the connection manner between the second elastic element 32 and the panel 2, and the description thereof is omitted.
Alternatively, in the present invention, the second elastic element 32 and the third elastic element 33 are both springs. In different embodiments of the present invention, different kinds of elastic elements can be selected according to different actual requirements.
Further, the second elastic element 32 and the third elastic element 33 are both tension springs.
For the anti-interference device provided by the present invention, when the device is used for eliminating the interference of the external vibration to the photoacoustic cell, objects such as the photoacoustic cell need to be placed on the panel 2, and at this time, a plurality of first elastic elements 31, second elastic elements 32 and third elastic elements 33 need to be arranged, so that the panel 2 is in a mechanically balanced state. The positions, the number, and the strength of the first elastic element 31, the second elastic element 32, and the third elastic element 33 can be adjusted according to the weight, the position, and the like of the object placed on the panel 2.
Alternatively, the first elastic elements 31 are arranged in pairs in order to first maintain a balanced condition in small areas on the panel 2.
Further, the second elastic member 32 and the third elastic member 33 are disposed at four corners of the groove 1. Furthermore, in order to better maintain the balance state of the panel 2, a second elastic element 32 and a third elastic element 33 are arranged at the corners of each of the concave grooves 1, and the second elastic element 32 and the third elastic element 33 are arranged in pairs.
On the other hand, the invention also provides a system for eliminating the interference of the external vibration on the photoacoustic cell, which comprises the anti-interference device, the photoacoustic cell and the vibration signal acquisition device, wherein the photoacoustic cell and the vibration signal acquisition device are arranged on a panel of the anti-interference device.
As the system is applied, the vibration frequency type and the numerical value in the cabinet are stable, so that the system is applied to an online monitoring instrument in the cabinet, and the accuracy of a monitoring result can be better improved.
Secondly, the invention also provides a method for eliminating the interference of the external vibration on the photoacoustic cell by using the system, which comprises the following working processes:
the concave groove 1 in the anti-jamming device is used as a base and a supporting body of the whole anti-jamming device, and the concave groove 1 does not vibrate in the system and is a medium for receiving external vibration by the system.
The system is arranged on a vibration experiment table, and firstly, when the vibration experiment table does not vibrate, namely, no external vibration exists, the sound wave signals of the photoacoustic cell are acquired through a vibration signal acquisition device.
Then, exert the vibration to the vibration laboratory bench, after concave groove 1 received external vibration, conduct on panel 2 through first elastic element 31, second elastic element 32, third elastic element 33, and then act on the optoacoustic cell of arranging on panel 2 for the optoacoustic cell vibration, and then will influence the optoacoustic effect of sample in the optoacoustic cell, cause the interference to the detected signal.
At this time, the tightness degree of the adjusting screw 6 is adjusted to realize the compression or the relaxation of the first elastic element 31 and the stretching or the shortening of the second elastic element 32 and the third elastic element 33, so that the system reaches a state of mechanical equilibrium, the interference of external vibration on a detection signal in the photoacoustic cell is counteracted, and the acoustic signal value of the detection signal reaches a vibration-free state.
Finally, it should be noted that: it should be understood that the above examples are only for clearly illustrating the present invention and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the scope of the invention.
Claims (10)
1. A device for eliminating the interference of external vibration on a photoacoustic cell is characterized by comprising a concave groove, a panel, a first elastic element, a second elastic element and a third elastic element;
one end of the first elastic element is fixed on the bottom plate of the concave groove and is vertical to the bottom plate, the other end of the first elastic element is connected with the panel, and the panel is positioned in the concave groove and is parallel to the bottom plate;
the second elastic element and the third elastic element are both parallel to the panel and are perpendicular to each other;
one end of the second elastic element is fixedly connected to the inner wall of the concave groove, and the other end of the second elastic element is connected with a first positioning bushing arranged on the panel;
one end of the third elastic element is fixedly connected to the inner wall of the concave groove, and the other end of the third elastic element is connected with a second positioning bush arranged on the panel;
the panel is in a mechanical balance state by adjusting the first elastic element, the second elastic element and the third elastic element.
2. The apparatus of claim 1, wherein the first elastic element, the second elastic element, and the third elastic element are springs.
3. The apparatus of claim 1, wherein a plurality of the first elastic element, the second elastic element, and the third elastic element are disposed such that the panel is in a state of mechanical equilibrium.
4. The apparatus of claim 3, wherein the second elastic element and the third elastic element are located at four corners of the concave groove.
5. The apparatus of claim 4, wherein the second elastic element and the third elastic element are disposed in pairs at each corner of the concave groove.
6. The apparatus of claim 1, wherein the first elastic element is connected to the front of the panel by an adjusting screw.
7. The apparatus of claim 1, wherein the second elastic element is connected to the first positioning sleeve by a set screw.
8. The device for eliminating the interference of the external vibration to the photoacoustic cell of claim 1 wherein the third spring means is connected to the second positioning sleeve by an adjusting screw.
9. A system for eliminating interference of external vibration to a photoacoustic cell, comprising the apparatus for eliminating interference of external vibration to a photoacoustic cell, and a vibration signal collecting apparatus according to any one of claims 1 to 8, wherein the photoacoustic cell and the vibration signal collecting apparatus are disposed on the panel.
10. A method for eliminating interference of external vibration to a photoacoustic cell by using the system of claim 9, wherein when the system is interfered by external vibration, the system is in a state of mechanical equilibrium by adjusting the first elastic element, the second elastic element and the third elastic element, so as to cancel interference of external vibration to a detection signal in the photoacoustic cell.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811338401.2A CN109342323B (en) | 2018-11-12 | 2018-11-12 | Device and method for eliminating interference of external vibration on photoacoustic cell |
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| CN201811338401.2A CN109342323B (en) | 2018-11-12 | 2018-11-12 | Device and method for eliminating interference of external vibration on photoacoustic cell |
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| CN109342323A CN109342323A (en) | 2019-02-15 |
| CN109342323B true CN109342323B (en) | 2021-07-06 |
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| CN115656040A (en) * | 2022-10-11 | 2023-01-31 | 国网湖北省电力有限公司电力科学研究院 | Anti-vibration SF6 gas decomposition product detection device |
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| CN1818611A (en) * | 2006-03-21 | 2006-08-16 | 武汉理工大学 | Method for measuring adhering material shearing performance and its experimental device thereof |
| CN102539331B (en) * | 2012-02-13 | 2014-12-10 | 上海交通大学 | Single-cavity photo-acoustic cell for non-invasive blood glucose detection and detection method thereof |
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| CN107178576A (en) * | 2017-07-19 | 2017-09-19 | 蒙彦彤 | The electromechanical equipment damping device acted on bidirectional damping |
| CN208010857U (en) * | 2018-02-24 | 2018-10-26 | 广州康鹏电力设备科技有限公司 | A kind of damping device for generating set |
| CN108479901A (en) * | 2018-03-22 | 2018-09-04 | 辽宁三三工业有限公司 | Slurry balance shield crusher machine machine hydraulic tube protective device |
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