CN204374060U - A kind of resonance photoacoustic cell for oil and gas detection - Google Patents
A kind of resonance photoacoustic cell for oil and gas detection Download PDFInfo
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- CN204374060U CN204374060U CN201420544498.3U CN201420544498U CN204374060U CN 204374060 U CN204374060 U CN 204374060U CN 201420544498 U CN201420544498 U CN 201420544498U CN 204374060 U CN204374060 U CN 204374060U
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Abstract
The utility model discloses a kind of resonance photoacoustic cell for oil and gas detection, comprise resonatron and the surge chamber being arranged on resonatron both sides, microphone is provided with in resonatron, two surge chambers are respectively arranged with draft tube and escape pipe, surge chamber is provided with and passes through window for laser, also acoustic filter is provided with in surge chamber, described window is obliquely installed, the axis of window and the angle of resonatron axis are 45 °, resonatron inwall is provided with several reflector plates, reflection skin graft is parallel to the axis of resonatron, reducing is provided with between resonatron and surge chamber, reducing is the hyperboloid of one sheet, the minimum place of its internal diameter is 1:5 with the ratio of resonatron internal diameter, reducing is provided with fillet with surge chamber and contacting of resonatron, the arranged outside of resonatron has pugging, draft tube and escape pipe are respectively arranged with a rubber sacculus.The utility model can improve the deficiencies in the prior art, improves the intensity of resonant acoustic wave.
Description
Technical field
The utility model relates to optoacoustic spectroscopy field, especially a kind of resonance photoacoustic cell for oil and gas detection.
Background technology
Optoacoustic spectroscopy is a kind of lossless detection technology fast-developing in the last few years, and its principle is: after light absorbing substance receives and excites, return initial state by radiation transistion or radiationless transition.Last process produces fluorescence or phosphorescence, and a rear process then produces heat.Because absorbing light intensity is cyclical variation, container inner pressure fluctuation is also in periodicity.When sample be gas or liquid time, itself be exactly pressure medium.Because the frequency of light modulated is generally positioned at audio range, so this pressure fluctuation just becomes sound wave, thus can by the perception of acoustic sensor institute.The acoustic signals of acoustic sensor institute perception is light signal through synchronously amplifying the electric signal obtained.If recorded by the function of photoacoustic signal as incident light frequency, just Photoa-counstic spectra can be obtained.Here the container used is exactly photoacoustic cell.The photoacoustic cell that wherein resonates can realize the continuous monitoring of detected object, and does not need photoacoustic cell airtight.Chinese invention patent application CN 101949821 A is disclosed is exactly a kind of resonance photoacoustic cell, but the resonance photoacoustic cell of prior art is larger for the loss of resonant acoustic wave.
utility model content
The technical problems to be solved in the utility model is to provide a kind of resonance photoacoustic cell for oil and gas detection, can solve the deficiencies in the prior art, improves the intensity of resonant acoustic wave.
For solving the problems of the technologies described above, technical solution adopted in the utility model is as follows.
A kind of resonance photoacoustic cell for oil and gas detection, comprise resonatron and the surge chamber being arranged on resonatron both sides, microphone is provided with in resonatron, two surge chambers are respectively arranged with draft tube and escape pipe, surge chamber is provided with and passes through window for laser, also acoustic filter is provided with in surge chamber, described window is obliquely installed, the axis of window and the angle of resonatron axis are 45 °, resonatron inwall is provided with several reflector plates, reflection skin graft is parallel to the axis of resonatron, laser is injected along the direction of window axis, reflection through each reflector plate is finally penetrated along the axis of another window, reducing is provided with between resonatron and surge chamber, the axis of reducing and the axis of window overlap, reducing is the hyperboloid of one sheet, the minimum place of its internal diameter is 1:5 with the ratio of resonatron internal diameter, reducing is provided with fillet with surge chamber and contacting of resonatron, the arranged outside of resonatron has pugging, draft tube and escape pipe are respectively arranged with a rubber sacculus.
As preferably, described resonatron length is 80mm, and internal diameter is 4mm, and the volume of surge chamber is 50:1 with the ratio of the volume of resonatron.
As preferably, described resonatron inwall is provided with several grooves, and described microphone and reflector plate are all arranged in groove, and microphone is concordant with the upper edge of reflector plate and two linear sides of groove end face.
As preferably, pugging comprises the metal support of inner side, and the space vacuum pumping of metal support, the arranged outside of metal support has rubber layer.
The beneficial effect adopting technique scheme to bring is: the utility model improves on the basis of existing technology, losing and improving the intensity of the resonant acoustic wave that resonatron produces, realizing the raising of measuring accuracy by reducing resonant acoustic wave.First the incident angle of laser is changed, the inclination realizing 45 ° is injected, then by after the reducing coaxial with incident light, through the reflection of reflector plate, laser beam carries out multiple reflections in resonatron, thus realizes the increase of the resonatron inner laser transmission length in same length, and in laser and resonatron, the contact area of measured matter increases, achieve under the prerequisite of identical power input, improve the intensity that in resonatron, sound wave excites.Microphone and reflector plate are arranged in groove, can improve the flatness of resonatron inwall, reduce the generation of clutter.Because resonance photoacoustic cell does not carry out airtight, so there will be acoustic wave segment is diffused into cushion chamber problem by resonatron when measuring.The utility model is provided with reducing at the two ends of resonatron, then at the arranged outside pugging of resonatron, reducing can form an acoustic reflection face between resonatron and cushion chamber, most of sound wave to external diffusion is reflected in reducing place, pugging also form a reflecting surface in the radial direction of resonatron, the sound wave that resonatron inside spreads out of can reflect by the metal support with vacuum area, utilize rubber layer the noise in the external world can be carried out absorbing and filtering simultaneously, avoid noise to import resonatron inside into.Because the change of sound wave in resonatron by pressure produces, the pressure change of a small amount of fluid spread out of from resonatron inside can cushion, to improve the stability of whole gas circuit flowing by the rubber sacculus on draft tube and escape pipe.
Accompanying drawing explanation
Fig. 1 is the structural drawing of the utility model embodiment.
Fig. 2 is the partial enlarged drawing of resonatron in the utility model embodiment.
Fig. 3 is the structural drawing of pugging in the utility model embodiment.
Fig. 4 is the structural drawing of reducing in the utility model embodiment.
In figure: 1, resonatron; 2, surge chamber; 3, microphone; 4, draft tube; 5, escape pipe; 6, window; 7, reflector plate; 8, reducing; 9, pugging; 10, rubber sacculus; 11, groove; 12, metal support; 13, rubber layer; 14, acoustic filter; 15, rubber diaphragm.
Embodiment
The standardized element used in the utility model all can be commercially, shaped piece all can carry out customized according to instructions with the record of accompanying drawing, the concrete connected mode of each part all adopts the conventional means such as bolt, rivet, welding, stickup ripe in prior art, is not described in detail in this.
With reference to Fig. 1-4, the utility model embodiment comprises resonatron 1 and is arranged on the surge chamber 2 of resonatron 1 both sides, microphone 3 is provided with in resonatron 1, two surge chambers 2 are respectively arranged with draft tube 4 and escape pipe 5, surge chamber 2 is provided with and passes through window 6 for laser, acoustic filter 14 is also provided with in surge chamber 2, described window 6 is obliquely installed, the axis of window 6 and the angle of resonatron 1 axis are 45 °, resonatron 1 inwall is provided with several reflector plates 7, reflection skin graft 7 is parallel to the axis of resonatron 1, laser is injected along the direction of window 6 axis, reflection through each reflector plate 7 is finally penetrated along the axis of another window 6, resonatron 1 inwall is provided with several grooves 11, described microphone 3 and reflector plate 7 are all arranged in groove 11, microphone 3 is concordant with the upper edge of reflector plate 7 and two linear sides of groove 11 end face.Reducing 8 is provided with between resonatron 1 and surge chamber 2, reducing 8 is the hyperboloid of one sheet, the minimum place of its internal diameter is 1:5 with the ratio of resonatron 1 internal diameter, reducing 8 is provided with fillet with surge chamber 2 and contacting of resonatron 1, the arranged outside of resonatron 1 has pugging 9, and draft tube 4 and escape pipe 5 are respectively arranged with a rubber sacculus 10.Pugging 9 comprises the metal support 12 of inner side, and the space vacuum pumping of metal support 12, the arranged outside of metal support 12 has rubber layer 13.
First the incident angle of laser changes by the present embodiment, the inclination realizing 45 ° is injected, then by after the reducing 8 coaxial with incident light, through the reflection of reflector plate 7, laser beam carries out multiple reflections in resonatron 1, thus realizes the increase of the resonatron 1 inner laser transmission length in same length, and in laser and resonatron 1, the contact area of measured matter increases, achieve under the prerequisite of identical power input, improve the intensity that in resonatron 1, sound wave excites.Microphone 3 and reflector plate 7 are arranged in groove 11, can improve the flatness of resonatron 1 inwall, reduce the generation of clutter.Because resonance photoacoustic cell does not carry out airtight, so there will be acoustic wave segment is diffused into cushion chamber 2 problem by resonatron 1 when measuring.The present embodiment is provided with reducing 8 at the two ends of resonatron 1, then at the arranged outside pugging 9 of resonatron 1, reducing 8 can form an acoustic reflection face between resonatron 1 and cushion chamber 2, most of sound wave to external diffusion is reflected at reducing 8 place, pugging 9 also form a reflecting surface in the radial direction of resonatron 1, the sound wave that resonatron 1 inside spreads out of can reflect by the metal support 12 with vacuum area, utilize rubber layer 13 noise in the external world can be carried out absorbing and filtering simultaneously, avoid noise to import resonatron 1 into inner.Because in resonatron 1, sound wave is produced by the change of pressure, the change of the pressure of a small amount of fluid spread out of from resonatron 1 inside can cushion by the rubber sacculus 10 on draft tube 4 and escape pipe 5, to improve the stability of whole gas circuit flowing.
Resonatron 1 length of the present embodiment is 80mm, and internal diameter is 4mm, and the volume of surge chamber 2 is 50:1 with the ratio of the volume of resonatron 1, and the material of resonatron 1 is stainless steel, and the material of reducing 8 is magnalium.By the form parameter of preferred photoacoustic cell and the reducing 8 of use magnalium, can existing about 30 ~ 40 be had to be increased to more than 55 the quality factor q of photoacoustic cell.
Further, two rubber sacculus 10 can be connected by rubber diaphragm 15, the elastic modulus of rubber diaphragm 15 is preferably 500Pa ~ 600Pa.By using rubber diaphragm 15 to be connected by two rubber sacculus 10, the pressure surge passed in resonatron can be made to cancel out each other at rubber diaphragm 15, thus use pressure surge itself to offset himself.
The utility model is the improvement that the basis of the patent documentation quoted in the introduction is carried out, thus for microphone 3, window 6 and acoustic filter 14 etc. in the literature the parts of fully disclosed prior art concrete structure be connected use-pattern and no longer describe in detail.
The photoacoustic cell quoted in use background technology and the present embodiment carry out Experimental comparison, and correlation data is as follows:
| Group | Resonatron intensity of acoustic wave (mV) | The accounting (%) of background noise |
| Prior art | 0.7 | 23 |
| The present embodiment | 1.1 | 11 |
More than show and describe ultimate principle of the present utility model and principal character and advantage of the present utility model.The technician of the industry should understand; the utility model is not restricted to the described embodiments; what describe in above-described embodiment and instructions just illustrates principle of the present utility model; under the prerequisite not departing from the utility model spirit and scope; the utility model also has various changes and modifications, and these changes and improvements all fall within the scope of claimed the utility model.The claimed scope of the utility model is defined by appending claims and equivalent thereof.
Claims (4)
1. the resonance photoacoustic cell for oil and gas detection, comprise resonatron (1) and be arranged on the surge chamber (2) of resonatron (1) both sides, microphone (3) is provided with in resonatron (1), two surge chambers (2) are respectively arranged with draft tube (4) and escape pipe (5), surge chamber (2) is provided with and passes through window (6) for laser, acoustic filter (14) is also provided with in surge chamber (2), it is characterized in that: described window (6) is obliquely installed, the axis of window (6) and the angle of resonatron (1) axis are 45 °, resonatron (1) inwall is provided with several reflector plates (7), reflection skin graft (7) is parallel to the axis of resonatron (1), laser is injected along the direction of window (6) axis, reflection through each reflector plate (7) is finally penetrated along the axis of another window (6), reducing (8) is provided with between resonatron (1) and surge chamber (2), the axis of reducing (8) and the axis of window (6) overlap, reducing (8) is the hyperboloid of one sheet, the ratio of the minimum place of its internal diameter and resonatron (1) internal diameter is 1:5, reducing (8) is provided with fillet with surge chamber (2) and contacting of resonatron (1), the arranged outside of resonatron (1) has pugging (9), draft tube (4) and escape pipe (5) are respectively arranged with a rubber sacculus (10).
2. the resonance photoacoustic cell for oil and gas detection according to claim 1, it is characterized in that: described resonatron (1) length is 80mm, internal diameter is 4mm, and the ratio of the volume of surge chamber (2) and the volume of resonatron (1) is 50:1.
3. the resonance photoacoustic cell for oil and gas detection according to claim 1, it is characterized in that: described resonatron (1) inwall is provided with several grooves (11), described microphone (3) and reflector plate (7) are all arranged in groove (11), and microphone (3) is concordant with the upper edge of reflector plate (7) and two linear sides of groove (11) end face.
4. the resonance photoacoustic cell for oil and gas detection according to claim 1, it is characterized in that: described pugging (9) comprises the metal support (12) of inner side, the space vacuum pumping of metal support (12), the arranged outside of metal support (12) has rubber layer (13).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420544498.3U CN204374060U (en) | 2014-09-22 | 2014-09-22 | A kind of resonance photoacoustic cell for oil and gas detection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420544498.3U CN204374060U (en) | 2014-09-22 | 2014-09-22 | A kind of resonance photoacoustic cell for oil and gas detection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204374060U true CN204374060U (en) | 2015-06-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420544498.3U Expired - Fee Related CN204374060U (en) | 2014-09-22 | 2014-09-22 | A kind of resonance photoacoustic cell for oil and gas detection |
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| Country | Link |
|---|---|
| CN (1) | CN204374060U (en) |
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2014
- 2014-09-22 CN CN201420544498.3U patent/CN204374060U/en not_active Expired - Fee Related
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150603 Termination date: 20200922 |
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| CF01 | Termination of patent right due to non-payment of annual fee |