CN113588508A - Threaded connection type optical fiber aerosol concentration measurement probe and concentration measurement device - Google Patents
Threaded connection type optical fiber aerosol concentration measurement probe and concentration measurement device Download PDFInfo
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 125
- 239000000523 sample Substances 0.000 title claims abstract description 76
- 239000000443 aerosol Substances 0.000 title claims abstract description 59
- 238000005259 measurement Methods 0.000 title claims description 70
- 238000001514 detection method Methods 0.000 claims description 27
- 239000011358 absorbing material Substances 0.000 claims description 4
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- 238000007254 oxidation reaction Methods 0.000 claims description 3
- 230000003287 optical effect Effects 0.000 abstract description 13
- 239000000835 fiber Substances 0.000 description 14
- 238000010586 diagram Methods 0.000 description 6
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- 239000000428 dust Substances 0.000 description 4
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- 239000000843 powder Substances 0.000 description 3
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- 239000002245 particle Substances 0.000 description 2
- 239000011241 protective layer Substances 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
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Abstract
The invention discloses a thread connection type optical fiber aerosol concentration measuring probe and a concentration measuring device, wherein the measuring probe comprises: the optical fiber connector comprises a sleeve, wherein a first groove is formed in the first end of the sleeve, and a parabolic condenser and a first filter lens are sequentially arranged in the first groove along the direction far away from the second end of the sleeve; the probe body comprises a middle measuring piece and a rear end measuring piece, the middle measuring piece is provided with a through hole along the length direction of the middle measuring piece, the side wall of the middle measuring piece is provided with a hollow hole, the first end of the rear end measuring piece is provided with a second groove, a concave reflector and a second filter lens are sequentially arranged in the second groove along the direction far away from the second end of the rear end measuring piece, and the rear end measuring piece is in threaded fit with the inner wall of the through hole; the sleeve pipe with the inner wall screw-thread fit of perforating hole, perhaps, the inside fixedly connected with front end measuring part of the second end of middle measuring part, sheathed tube first end can stretch into front end measuring part and rather than screw-thread fit. The measuring probe can change the optical path of the measuring probe, and has stronger universality.
Description
Technical Field
The invention relates to the technical field of aerosol concentration detection, in particular to a threaded connection type optical fiber aerosol concentration measuring probe and a concentration measuring device.
Background
In order to verify the reliability of the dry powder fire extinguishing system in the power cabin of the transportation vehicles such as airplanes and the like, the concentration of fire extinguishing agent particles in a complex protected space of the dry powder fire extinguishing system needs to be detected in real time.
In the actual measurement process, the design of a sensor measurement probe installed in a complicated and limited space is particularly important. Different measurement positions in the space have different concentration measurement ranges of the required sensors due to different aerosol concentrations, namely, the optical paths of the reflection type measurement probes are different. The traditional reflection type optical fiber measuring probe is simple and fixed in structure and poor in universality.
Disclosure of Invention
In view of the above, a first object of the present invention is to provide a screw connection type optical fiber aerosol concentration measurement probe, which can change the optical path of the measurement probe and has stronger versatility. A second object of the present invention is to provide a concentration measuring apparatus including the above-described measuring probe.
In order to achieve the first object, the invention provides the following technical scheme:
a threaded optical fiber aerosol concentration measurement probe, comprising:
the tail end of the optical fiber bundle can be nested in the sleeve, a first groove is formed in the first end of the sleeve, a parabolic condenser and a first filter lens are sequentially arranged in the first groove along the direction far away from the second end of the sleeve, and external threads are formed in the outer surface of the sleeve;
the probe comprises a probe body, wherein the probe body comprises a middle measuring piece and a rear end measuring piece, the middle measuring piece is provided with a through hole along the length direction of the middle measuring piece, the side wall of the middle measuring piece is provided with a hollow hole, the first end of the rear end measuring piece is provided with a second groove, a concave reflector and a second filter lens are sequentially arranged in the second groove along the direction far away from the second end of the rear end measuring piece, the first end of the rear end measuring piece can extend into the through hole from the first end of the middle measuring piece, and the rear end measuring piece is in threaded fit with the inner wall of the through hole;
the first end of the sleeve can be extended into the through hole from the second end of the middle measuring piece, the sleeve is in threaded fit with the inner wall of the through hole, or the front end measuring piece is fixedly connected inside the second end of the middle measuring piece, and the first end of the sleeve can be extended into the front end measuring piece and is in threaded fit with the front end measuring piece.
Preferably, in the above screw connection type optical fiber aerosol concentration measuring probe, the inside of the second end of the intermediate measuring member is fixedly connected with a front end measuring member, the front end measuring member is in screw-thread fit with the inner wall of the through hole, and the first end of the sleeve can extend into the front end measuring member and the sleeve is in screw-thread fit with the front end measuring member.
Preferably, in the above screw connection type optical fiber aerosol concentration measuring probe, the first end of the sleeve is a circular truncated cone, and the inner surface of the end portion of the internal thread hole of the front end measuring part, which is close to the rear end measuring part, is a circular truncated cone which can abut against the first end of the sleeve.
Preferably, in the above screw connection type optical fiber aerosol concentration measurement probe, the number of the hollow holes is 2-4, and the plurality of hollow holes are uniformly distributed along the circumferential direction of the intermediate measurement member;
the extending distance of the hollow hole along the length direction of the middle measuring piece is less than or equal to 10 cm.
Preferably, in the above screw-threaded optical fiber aerosol concentration measurement probe, the diameter of the parabolic condenser is smaller than that of the concave reflector.
Preferably, in the above screw connection type optical fiber aerosol concentration measurement probe, the optical fiber bundle is a Y-shaped optical fiber bundle, the Y-shaped optical fiber bundle includes a light source optical fiber bundle and a detection optical fiber bundle, the light source optical fiber bundle and the detection optical fiber bundle are converged into a bundle combining optical fiber through an optical fiber coupler, and a distal end of the bundle combining optical fiber is nested in the sleeve;
the light source optical fiber bundle is used for connecting a light source, the detection optical fiber bundle is used for connecting a detector, and the tail end of the beam combining optical fiber is used for being opposite to the parabolic condenser;
the detection optical fiber bundle comprises a plurality of detection optical fiber cores, the light source optical fiber bundle comprises a light source optical fiber core, and the plurality of detection optical fiber cores are uniformly distributed around the light source optical fiber core in the bundle combining optical fiber structure.
Preferably, in the above screw-threaded optical fiber aerosol concentration measurement probe, the surface of the first filter lens and/or the second filter lens is provided with a dust-proof coating.
Preferably, in the screw connection type optical fiber aerosol concentration measurement probe, the sleeve and the probe body are both made of light absorption materials and are both subjected to oxidation blackening treatment.
Preferably, in the above screw-threaded optical fiber aerosol concentration measurement probe, the length of the external thread of the sleeve is 5-10cm, and the external thread of the sleeve extends from the first end of the sleeve to the second end of the sleeve.
A concentration measurement apparatus comprising a measurement probe as claimed in any preceding claim.
When the threaded connection type optical fiber aerosol concentration measuring probe provided by the embodiment is applied, the first end of the rear end measuring piece extends into the through hole from the first end of the middle measuring piece, the rear end measuring piece is in threaded fit with the inner wall of the through hole, the first end of the sleeve extends into the through hole from the second end of the middle measuring piece or the first end of the sleeve can extend into the front end measuring piece, and the sleeve is in threaded fit with the front end measuring piece. The space between the first filter lens and the second filter lens in the through hole forms a measuring space. The measuring light from the light source enters the measuring space after passing through the parabolic condenser and the first filter lens, the measuring light passes through the measuring space and then reaches the concave surface reflecting lens after passing through the second filter lens, and the measuring light is transmitted into the optical fiber bundle after sequentially passing through the second filter lens, the measuring space, the first filter lens and the parabolic condenser lens after being reflected by the concave surface reflecting lens. Before measurement, the sleeve and/or the rear end measuring piece are/is rotated according to a required measuring range, the distance between the first filter lens and the second filter lens is adjusted, and the optical path of the measuring probe is adjusted.
In order to achieve the second object, the invention further provides a concentration measuring device which comprises any one of the threaded connection type optical fiber aerosol concentration measuring probes. Because the threaded connection type optical fiber aerosol concentration measuring probe has the technical effects, the concentration measuring device with the threaded connection type optical fiber aerosol concentration measuring probe also has the corresponding technical effects.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a concentration measuring apparatus according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a screw connection type optical fiber aerosol concentration measurement probe according to an embodiment of the present invention;
FIG. 3 is a cross-sectional view of a screw-threaded optical fiber aerosol concentration measurement probe provided in an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a bushing provided in an embodiment of the present invention;
FIG. 5 is a cross-sectional view of a first end of a cannula provided in accordance with an embodiment of the present invention;
FIG. 6 is a schematic structural diagram of a front end measuring device according to an embodiment of the present invention;
FIG. 7 is a schematic structural diagram of an intermediate measuring member according to an embodiment of the present invention;
FIG. 8 is a schematic structural view of an intermediate measuring member according to another embodiment of the present invention;
FIG. 9 is a schematic structural diagram of a rear end measuring device according to an embodiment of the present invention;
FIG. 10 is a cross-sectional view of a rear end measurement member provided in accordance with an embodiment of the present invention;
FIG. 11 is a cross-sectional view of a bundled optical fiber according to an embodiment of the invention;
FIG. 12 is a cross-sectional view of an optical fiber beam of an optical source according to an embodiment of the present invention;
FIG. 13 is a cross-sectional view of a detection fiber bundle according to an embodiment of the present invention.
In fig. 1-13:
a1-beam combination optical fiber, A2-optical fiber coupler, A3-light source optical fiber beam, A31-light source optical fiber core, A4-detection optical fiber beam, A41-detection optical fiber core, A5-protective layer, B-detector, C-light source and D-measuring probe;
1-sleeve, 11-parabolic condenser, 12-first filter lens, 2-probe body, 21-front end measuring piece, 22-middle measuring piece, 221-hollow hole, 23-rear end measuring piece, 231-concave reflector and 232-second filter lens.
Detailed Description
The first purpose of the invention is to provide a threaded connection type optical fiber aerosol concentration measurement probe, which can change the optical path of the measurement probe and has stronger universality. A second object of the present invention is to provide a concentration measuring apparatus including the above-described measuring probe.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left" and "right", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the positions or elements referred to must have specific orientations, be constructed in specific orientations, and be operated, and thus are not to be construed as limitations of the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Referring to fig. 1 to 13, the screw connection type optical fiber aerosol concentration measurement probe D provided by the present invention can be placed in an aerosol environment, and includes a sleeve 1 and a probe body 2.
Wherein the ferrule 1 is used for nesting the ends of the optical fiber bundles, i.e. the ends of the optical fiber bundles can be nested within the ferrule 1. The two ends of the sleeve 1 are respectively a first end and a second end. The first end of the sleeve 1 is provided with a first groove, the direction from the notch to the groove bottom of which extends in the axial direction of the sleeve 1, i.e. the depth direction of the first groove extends in the axial direction of the sleeve 1. Parabolic condenser 11 and first filter lens 12 have been set gradually along the direction of keeping away from sleeve 1 second end in the first recess, and parabolic condenser 11 and first filter lens 12 arrange along first recess depth direction in proper order promptly, and parabolic condenser 11 is close to the tank bottom setting, and first filter lens 12 is close to the notch setting.
The outer surface of the sleeve 1 is provided with external threads.
The probe body 2 includes an intermediate measuring member 22 and a rear end measuring member 23. The intermediate measuring member 22 is provided with a through hole along the longitudinal direction thereof, i.e., the through hole extends along the longitudinal direction of the intermediate measuring member 22.
The side wall of the middle measuring part 22 is provided with a hollow hole 221, and the hollow hole 221 is communicated with the through hole and the space outside the middle measuring part 22, so that aerosol can enter the through hole.
The first end of the rear end measuring piece 23 is provided with a second groove. The direction from the notch to the groove bottom of the second groove extends along the length direction of the rear end measuring piece 23, i.e., the depth direction of the second groove extends along the length direction of the rear end measuring piece 23. Concave reflector 231 and second filter lens 232 are sequentially arranged in the second groove along the direction far away from the second end of rear end measuring part 23, that is, concave reflector 231 and second filter lens 232 are sequentially arranged along the depth direction of the second groove, concave reflector 231 is close to the groove bottom, and second filter lens 232 is close to the groove opening.
A first end of the rear end measuring piece 23 can extend from the first end of the middle measuring piece 22 into the through hole, and the rear end measuring piece 23 is in threaded fit with the inner wall of the through hole. That is, the end of the rear end measuring part 23 provided with the concave reflecting mirror 231 and the second filter 232 extends into the through hole, and the distance that the rear end measuring part 23 extends into the through hole can be adjusted by rotating the rear end measuring part 23.
The first end of the sleeve 1 can extend from the second end of the intermediate piece 22 into the through hole and the sleeve 1 is screwed to the inner wall of said through hole. That is, the end of the sleeve 1 provided with the parabolic condenser lens 11 and the first filter lens 12 is inserted into the through hole, and the distance by which the sleeve 1 is inserted into the through hole can be adjusted by rotating the sleeve 1.
Alternatively, the second end of the middle measuring part 22 is fixedly connected with the front measuring part 21 inside, and the first end of the casing 1 can extend into the front measuring part 21 and be in threaded fit with the front measuring part 21. The first end of the sleeve 1 may extend into the front end measuring member 21 and the sleeve 1 is threadedly engaged with the front end measuring member 21. After the first end of the sleeve 1 and the first end of the rear measuring part 23 are both located in the middle measuring part 22, the first filter lens 12 and the second filter lens 232 are opposite, and the parabolic condenser lens 11 and the concave reflecting lens are coaxial. The sleeve 1 and/or the rear end measuring member 23 are rotated to adjust the distance between the first filter lens 12 and the second filter lens 232. Rotating the sleeve 1 and/or the rear end measuring member 23 may effect a change in the distance between the first filter lens 12 and the second filter lens 232.
When the screw connection type optical fiber aerosol concentration measuring probe provided by the above embodiment is applied, the first end of the rear end measuring part 23 extends into the through hole from the first end of the middle measuring part 22, the rear end measuring part 23 is in screw thread fit with the inner wall of the through hole, the first end of the sleeve 1 extends into the through hole from the second end of the middle measuring part 22, or the first end of the sleeve 1 can extend into the front end measuring part 21 and the sleeve 1 is in screw thread fit with the front end measuring part 21. The space within the through-hole between the first filter lens 12 and the second filter lens 232 forms a measurement space. The measuring light from the light source C is converged by the parabolic condenser 11, the converged measuring light enters the measuring space after passing through the first filter lens 12, the measuring light passes through the measuring space and then reaches the concave surface reflection lens after passing through the second filter lens 232, the measuring light sequentially passes through the second filter lens 232, the measuring space and the first filter lens 12 after being reflected by the concave surface reflection lens, and then the measuring light is transmitted to the detection optical fiber bundle A4 after being dispersed by the parabolic condenser 11. Before measurement, the sleeve 1 and/or the rear end measuring part 23 are/is rotated according to a required measuring range, and the distance between the first filter lens 12 and the second filter lens 232 is adjusted to adjust the optical path of the measuring probe, so that the measuring probe is suitable for testing different aerosol concentrations, and the universality is higher. Moreover, the sleeve 1, the middle measuring part 22 and the rear end measuring part 23 are connected by threads, so that the sleeve is more convenient to install and replace.
In the screw connection type optical fiber aerosol concentration measuring probe provided by the invention, the light condensing performance of a reflection light path is improved by adopting the parabolic condenser 11 and the concave reflector 231, so that the light transmittance in the aerosol concentration measuring process is improved; the first filter lens 12 and the second filter 232 embedded in the measurement probe can effectively reduce the influence of stray light in the environment on the measurement result.
Specifically, when the aerosol concentration of the dust-containing gas at the measurement point in the complex confined space is low, the longitudinal length of the measurement through hole of the intermediate measurement member 22 may be increased or the distance between the first filter lens 12 and the second filter lens 232 may be increased, thereby increasing the measurement optical length and improving the measurement accuracy. When the aerosol concentration of the dust-containing gas at the measurement point in the complex confined space is high, the longitudinal length of the measurement through hole of the intermediate measurement member 22 or the distance between the first filter lens 12 and the second filter lens 232 can be reduced, so that the measurement optical path is reduced, and the measurement accuracy is improved.
In addition, the intermediate measuring member 22 may be cylindrical, but the intermediate measuring member 22 may also be other shapes, such as square column, and is not limited herein. The rear end measuring member 23, the front end measuring member 21 and the middle measuring member 22 may be coaxially disposed.
Optionally, a front end measuring member 21 is fixedly connected to the inside of the second end of the middle measuring member 22, and the front end measuring member 21 is screwed with the inner wall of the through hole. The front end measuring part 21 is provided with an internal threaded hole, the first end of the sleeve 1 can extend into the front end measuring part 21, and the sleeve 1 is in threaded fit with the front end measuring part 21. Rotating the front end measuring member 21, the sleeve 1 and/or the rear end measuring member 23 in this manner can adjust the distance between the first filter lens 12 and the second filter lens 232.
In the above embodiment, the sleeve 1 is screwed to the front measuring part 21, and the front measuring part 21 is screwed to the middle measuring part 22, so that the collimation of the measuring light can be improved, and the measuring accuracy can be improved.
Further, the first end of the sleeve 1 is a truncated cone, and the inner surface of the end portion of the internal threaded hole of the front end measuring piece 21 close to the rear end measuring piece 23 is a truncated cone which can abut against the first end of the sleeve 1. When the first end of the sleeve 1 is abutted to the circular table surface of the front end measuring part 21, the sleeve 1 can not extend into the front end measuring part 21 any more, so that the first end of the sleeve 1 is limited.
The front end measuring part 21 can be provided with a circular baffle, and when the front end measuring part 21 extends into the end face where the circular baffle abuts against the second end of the middle measuring part 22, the front end measuring part 21 can not extend into the middle measuring part 22 any more, so that the limitation of the front end measuring part 21 is realized.
The second end of rear end measuring part 23 also can set up circular baffle, and when rear end measuring part 23 stretched into its circular baffle and the terminal surface counterbalance of middle measuring part 22 first end, rear end measuring part 23 can not continue to stretch into middle measuring part 22 again, realizes rear end measuring part 23's spacing.
In a preferred embodiment, the number of the hollow holes 221 is multiple, and the multiple hollow holes 221 are uniformly distributed along the circumferential direction of the middle measuring member 22. That is, the plurality of through holes 221 are uniformly distributed around the axis of the through hole, so that the aerosol in the measurement space is uniformly distributed.
The number of the hollow holes 221 may be 2-4, and of course, the number of the hollow holes 221 may also be more, such as 5, 6, etc., which is not limited herein.
The extending distance of the hollow hole 221 along the length direction of the middle measuring part 22 is less than or equal to 10cm, so that the accumulation and the blockage of aerosol in the measuring process of high-concentration aerosol can be avoided, and the detection accuracy is improved. Of course, the extending distance of the hollow hole 221 along the length direction of the middle measuring member 22 may also be other values, and is not limited herein.
In some complex spaces such as an aircraft engine compartment, due to the complex spatial structure, the airflow changes greatly, and the aerosol concentration difference at different measuring points is large. When the aerosol concentration in a specific space needs to be evaluated, a plurality of measuring probes are often arranged according to the space structure. In one embodiment, the number of the measurement probes arranged in a specific space is n. The measurement points in space are respectively marked as S1，S2，S3，···，Sn. In general, the larger the number n of the measurement probes arranged in the space, the higher the accuracy of the measurement probes, and the better the evaluation effect on the aerosol concentration in the space. In order to improve the precision of the measuring probe, the optical paths of the required transmitted light are different for the measurement of aerosol environments with different concentrations. I.e. the distance d of the hollow-out hole 221 of the intermediate measuring member 22 extending along the length of the intermediate measuring member 22i(i ═ 1, 2,. cndot., n) are different. The extended distance d of the hollow hole 221 along the length direction of the middle measuring member 22iThe optimal determination method of (i ═ 1, 2, ·, n) is as follows: for different properties of the measured aerosol particles and different measured concentration ranges, the expression for the relationship between the transmitted light intensity and the original light intensity is, according to lambert-beer's law: i ═ I0e-cLK。I0The laser signal is an unattenuated laser signal, I is an attenuated laser signal, c is an aerosol concentration, L is an aerosol thickness through which incident light passes, and K is an absorption divergence coefficient. And determining the absorption divergence coefficient K of the measured powder. The transmissivity obtained by collecting the laser attenuation signal by the data collecting system is usually most suitable for data processing between 0.2 and 0.8, and the influence of noise signals such as stray light on the measurement result is small, so that the measurement result is more accurate. At Si(i ═ 1, 2,. cndot., n) the aerosol concentration measurement range is cimin-cimaxg/m3Then, the following relationship is obtained:
and
. By solving the above formula, the optical path L of the transmitted light at different positionsiWithin a reasonable range of
The hollow hole 221 of the intermediate measuring member 22 extends along the length direction of the intermediate measuring member 22 by a distance diAnd the optical path L of the transmitted lightiA relationship of di＝0.5Li(i＝1，2，···，n)。
In order to improve the light-gathering property of the initial measurement light, the optimal determination method for the extending distance d of the hollow hole 221 along the length direction of the intermediate measurement member 22, the radius R of the parabolic type condenser lens 11 and the radius R of the concave reflector 231, is as follows: when the initial measurement light divergence angle is α and the hollow hole 221 extends along the length direction of the intermediate measurement member 22 by a distance d, the radius R of the concave mirror 231 is R + dtan α. From above, the diameter of the parabolic condenser 11 is smaller than the diameter of the concave reflecting mirror 231.
The optical fiber bundle is a Y-shaped optical fiber bundle, and the Y-shaped optical fiber bundle comprises a light source optical fiber bundle A3 and a detection optical fiber bundle A4. The light source optical fiber bundle A3 and the detection optical fiber bundle A4 are converged into a combined optical fiber A1 through an optical fiber coupler A2, and the tail end of the combined optical fiber A1 is nested in the sleeve 1.
The light source optical fiber bundle A3 is used for connecting the light source C, the detection optical fiber bundle A4 is used for connecting the detector B, and the tail end of the beam combining optical fiber A1 is used for being opposite to the parabolic condenser lens 11. The detection fiber bundle a4 and the source fiber bundle A3 may be connected to the light source C or the detector B using SMA ports. The light source C may be a laser.
The measuring light emitted by the light source C is transmitted through the light source optical fiber bundle A3, and finally transmitted to the parabolic condenser 11 through the light source optical fiber bundle A3 in the beam combining optical fiber A1, the return measuring light is emitted into the detection optical fiber bundle A4 in the beam combining optical fiber A1 after passing through the parabolic condenser 11, and the return measuring light enters the detector B after passing through the detection optical fiber bundle A4.
Of course, the optical fiber bundle may be other types of optical fiber bundles, and is not limited herein.
As shown in fig. 11-13, the probe fiber bundle a4 includes a plurality of probe fiber cores a41, the source fiber bundle A3 includes a source fiber core a31, and the plurality of probe fiber cores a41 are uniformly distributed around the source fiber core a31 in the configuration of the bundle-combining fiber a 1. A protective layer A5 is provided around the probe optical fiber core A41 and the light source optical fiber core A31.
Of course, the number of the light source optical fiber cores a31 may be multiple, and the number of the detection optical fiber cores a41 and the number of the light source optical fiber cores a31 may be set according to actual situations.
When the aerosol concentration of the dust-containing gas at the measuring point in the complex confined space is low, the number of fiber cores of the light source optical fibers can be properly reduced or the number of fiber cores of the detection optical fibers can be increased. When the aerosol concentration of the dust-containing gas at the measuring point in the complex confined space is higher, the number of fiber cores of the light source optical fibers can be increased or the number of fiber cores of the detection optical fibers can be reduced properly.
In order to prevent the aerosol from falling to the surface of the first filter lens 12 and/or the second filter 232 and affecting the measurement result, the surface of the first filter lens 12 and/or the second filter 232 may also be provided with a dust-proof coating.
In order to further improve the measurement accuracy, the sleeve 1 and the probe body 2 can be both made of light-absorbing materials and both subjected to oxidation blackening treatment. Specifically, the sleeve 1 and the probe body 2 may be made of an aluminum alloy light absorbing material or other light absorbing materials, and are not limited herein.
In a preferred embodiment the length of the external thread of the sleeve 1 is 5-10cm and the external thread of the sleeve 1 extends from the first end of the sleeve 1 to the second end of the sleeve 1. With this arrangement, stable connection of the sleeve 1 and the front end measuring piece 21 is ensured, and the position adjustment range of the sleeve 1 is improved. The length of the external thread of the sleeve 1 may also be less than 5cm or greater than 10cm, without being limited thereto.
Based on the screw connection type optical fiber aerosol concentration measuring probe provided in the above embodiment, the invention also provides a concentration measuring device, which comprises any one of the screw connection type optical fiber aerosol concentration measuring probes provided in the above embodiments. As the concentration measuring device adopts the screw connection type optical fiber aerosol concentration measuring probe in the above embodiment, please refer to the above embodiment for the beneficial effects of the concentration measuring device.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Claims (10)
1. A threaded connection type optical fiber aerosol concentration measurement probe is characterized by comprising:
the optical fiber bundle optical fiber connector comprises a sleeve (1), wherein the tail end of an optical fiber bundle can be nested in the sleeve (1), a first groove is formed in the first end of the sleeve (1), a parabolic condenser (11) and a first filter lens (12) are sequentially arranged in the first groove along the direction far away from the second end of the sleeve (1), and external threads are formed in the outer surface of the sleeve (1);
the probe comprises a probe body (2), wherein the probe body (2) comprises a middle measuring piece (22) and a rear end measuring piece (23), the middle measuring piece (22) is provided with a through hole along the length direction of the middle measuring piece, the side wall of the middle measuring piece (22) is provided with a hollow hole (221), the first end of the rear end measuring piece (23) is provided with a second groove, a concave reflector (231) and a second filter lens (232) are sequentially arranged in the second groove along the direction far away from the second end of the rear end measuring piece (23), the first end of the rear end measuring piece (23) can extend into the through hole from the first end of the middle measuring piece (22), and the rear end measuring piece (23) is in threaded fit with the inner wall of the through hole;
the first end of sleeve pipe (1) can be followed the second end of middle measuring part (22) stretches into the perforating hole, just sleeve pipe (1) with the inner wall screw-thread fit of perforating hole, perhaps, the inside fixedly connected with front end measuring part (21) of the second end of middle measuring part (22), the first end of sleeve pipe (1) can stretch into front end measuring part (21) and rather than screw-thread fit.
2. The threaded optical fiber aerosol concentration measuring probe according to claim 1, wherein a front end measuring piece (21) is fixedly connected to the inside of the second end of the intermediate measuring piece (22), the front end measuring piece (21) is in threaded fit with the inner wall of the through hole, the first end of the sleeve (1) can extend into the front end measuring piece (21), and the sleeve (1) is in threaded fit with the front end measuring piece (21).
3. The threaded optical fiber aerosol concentration measurement probe according to claim 2, wherein the first end of the sleeve (1) is a circular truncated cone, and an inner surface of an end portion of the internal threaded hole of the front end measurement member (21) close to the rear end measurement member (23) is a circular truncated cone which can abut against the first end of the sleeve (1).
4. The threaded optical fiber aerosol concentration measurement probe according to claim 1, wherein the number of the hollowed-out holes (221) is 2-4, and a plurality of the hollowed-out holes (221) are uniformly distributed along the circumference of the intermediate measurement member (22);
the extending distance of the hollow hole (221) along the length direction of the intermediate measuring piece (22) is less than or equal to 10 cm.
5. A threaded optical fiber aerosol concentration measurement probe according to claim 1, wherein the parabolic concentrator mirror (11) has a diameter smaller than the diameter of the concave reflector (231).
6. The threaded optical fiber aerosol concentration measurement probe according to claim 1, wherein the optical fiber bundle is a Y-shaped optical fiber bundle, the Y-shaped optical fiber bundle comprises a light source optical fiber bundle (A3) and a detection optical fiber bundle (a4), the light source optical fiber bundle (A3) and the detection optical fiber bundle (a4) are converged into a combined optical fiber (a1) through an optical fiber coupler (a2), and the end of the combined optical fiber (a1) is nested in the sleeve (1);
the light source optical fiber bundle (A3) is used for connecting a light source (C), the detection optical fiber bundle (A4) is used for connecting a detector (B), and the tail end of the beam combining optical fiber (A1) is used for being opposite to the parabolic condenser (11);
the detection optical fiber bundle (A4) comprises a plurality of detection optical fiber cores (A41), the light source optical fiber bundle (A3) comprises a light source optical fiber core (A31), and a plurality of detection optical fiber cores (A41) are uniformly distributed around the light source optical fiber core (A31) in the structure of the beam combination optical fiber (A1).
7. A threaded optical fiber aerosol concentration measurement probe according to claim 1, characterized in that the surface of the first filter lens (12) and/or the second filter lens (232) is provided with a dust-proof coating.
8. The threaded optical fiber aerosol concentration measurement probe according to claim 1, wherein the sleeve (1) and the probe body (2) are both made of light absorbing material and are both subjected to oxidation blackening treatment.
9. A threaded optical fiber aerosol concentration measurement probe according to claim 1, characterized in that the external thread of the sleeve (1) has a length of 5-10cm and the external thread of the sleeve (1) extends from the first end of the sleeve (1) to the second end of the sleeve (1).
10. A concentration measurement device comprising a screw-threaded optical fiber aerosol concentration measurement probe according to any one of claims 1 to 9.
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