CN206583763U - A kind of reflection type optical fiber powder concentration measurement system - Google Patents
A kind of reflection type optical fiber powder concentration measurement system Download PDFInfo
- Publication number
- CN206583763U CN206583763U CN201720062226.3U CN201720062226U CN206583763U CN 206583763 U CN206583763 U CN 206583763U CN 201720062226 U CN201720062226 U CN 201720062226U CN 206583763 U CN206583763 U CN 206583763U
- Authority
- CN
- China
- Prior art keywords
- laser
- optical fiber
- reflection
- directional coupler
- light path
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn - After Issue
Links
Landscapes
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The utility model is related to powder concentration measurement technical field, specifically disclose a kind of reflection type optical fiber powder concentration measurement system, including measurement part, light source part, directional coupler part, signal conversion part point, measurement portion point includes laser adjustment end, decay area, reflection end, light source part produces laser and laser is sent into directional coupler part, laser is sent to measurement portion point by directional coupler part by optical fiber, laser enters behind measurement part, pass through the adjustment of laser adjustment end first, then inject decay area and measure decay, it is vertical again to inject reflection end, reflection end is by laser reflection and sequentially passes through decay area, directional coupler part is transmitted back to by optical fiber after laser adjustment end, the Laser Transmission after reflection to signal conversion part is divided in directional coupler part.The utility model uses optical signal transmission fiber, realizes long-range measurement, and measurement portion is divided into pure Optical devices, is placed on the too high measured zone of dust concentration very safe.
Description
Technical field
The utility model is related to powder concentration measurement field, more particularly to a kind of reflection type optical fiber powder concentration measurement system
System.
Background technology
The measuring method of dust concentration mainly includes Optical Analysis Method and non-optical analytic approach, and non-optical analytic approach is due to inspection
Measurement equipment response speed is slow, processing is complicated, it is difficult to which dust concentration is monitored in real time.And the dust concentration based on optical analysis
The features such as e measurement technology has high detectivity, selectivity strong, fast response time, is adapted to real time monitoring, and cost compared with
It is low, it is the Perfected process of later powder concentration measurement.
Existing hand-held apparatus for measuring dust concentration necessarily requires operating personnel to measure at the scene, and similar to coal
In the high environment of the dust concentrations such as ore deposit mine, operating personnel must carry out dust prevention in measurement, not so can damage respiratory tract,
It is unhealthful.Existing chemical equation sensor of dust concentration is, it is necessary to be acquired processing to air-borne dust, during with measurement
Prolong difference, it is impossible to measured in real time；Electric-type apparatus for measuring dust concentration security is poor, when mine dust concentration is too high, gently
Micro- electric spark can trigger the risk of mine explosion.And for optical fiber type sensor of dust concentration, traveling optical signal is entered using optical fiber
Long-distance communications, it is possible to achieve long-range measurement, but measuring instrument is located at high soot region, instrument surface or instrument after long-term use
Dust deposit is had in device, increases loss of the laser on transmission apparatus surface so that the laser propagation effect of laser is affected, and then
Influence measurement accuracy.
Utility model content
For problems of the prior art, the utility model provides a kind of reflection type optical fiber powder concentration measurement system
System, by optical fiber by optical signal transmission to measured zone, measures the echo area included in part by the laser after measurement according to original
Road is returned, then is passed back through optical fiber, is realized that same optical fiber transmits the laser of two different directions, has been saved laser remote transmission
Cost.
A kind of reflection type optical fiber powder concentration measurement system, including measurement part, light source part, directional coupler part,
Signal conversion part point, light source part, signal conversion part point are connected with directional coupler part respectively, measurement part and directional couple
Device part is connected by optical fiber, is measured part and is located at measure field, measurement divides partially away from light source part, signal conversion part, determined
To coupler section；Measurement portion point includes laser adjustment end, decay area, reflection end, wherein between laser adjustment end and reflection end
It is the under test gas containing dust for decay area, in decay area；Light source part produces laser and laser is sent into directional couple
Laser is sent to measurement portion point by device part, directional coupler part by optical fiber, and laser enters measurement part first by swashing
The adjustment of light adjustment end and then inject decay area and measure decay, then vertical injection reflection end, reflection end by laser reflection simultaneously
Sequentially pass through after decay area, laser adjustment end and directional coupler part is transmitted back to by optical fiber, after directional coupler part will be reflected
Laser Transmission to signal conversion part point.
Further, directional coupler part includes the first directional coupler and the second directional coupler, and optical fiber includes the
One optical fiber and the second optical fiber, signal conversion part point include the first detector and the second detector, wherein the first directional coupler, the
Two directional couplers are connected with light source part respectively, and the first directional coupler is connected with the head end of the first optical fiber, the second orientation coupling
Clutch is connected with the head end of the second optical fiber, and the first optical fiber is connected with the end of the second optical fiber with laser adjustment end；First detection
Device is connected with the first directional coupler, and the second detector is connected with the second directional coupler, the first detector and the second detector
The optical signal received is converted into electric signal.
Further, light source part includes laser, coupler, the beam splitter being sequentially connected, and wherein laser transmitting swashs
Laser is divided into the first light path and the second light path by light and the incoming beam splitter after coupler is coupled, beam splitter, and the first light path is entered
Enter after the first directional coupler and to be transmitted through the first optical fiber to laser adjustment end, the second light path enters after the second directional coupler through the
Two optical fiber are transmitted to laser adjustment end.
Further, laser adjustment end includes first laser adjustment end, second laser adjustment end, and decay is divided into first and declined
Subtract area, the second decay area, reflection end includes the first reflection end, the second reflection end, wherein the first decay area is adjusted positioned at first laser
Between whole end and the first reflection end, the second decay area is located between second laser adjustment end and the second reflection end；First laser is adjusted
Whole end is connected with the first optical fiber connector, and second laser adjustment end is connected with the second optical fiber connector；First optical routing first laser is adjusted
Transmit to the first decay area and decayed after whole end adjustment, the first light path after measurement decay vertically injects the first reflection end, the
Transmit to the second decay area and decayed after the adjustment of two optical routing second laser adjustment ends, the second light path after measurement decay is vertical
Inject the second reflection end；Light path of first light path in the first decay area is more than light path of second light path in the second decay area.
Further, measurement part also includes connecting rod, and wherein laser adjustment end is fixed by connecting rod with reflection end and connected
Connect.
Further, first laser adjustment end includes first collimator and the first plano lens, and second laser adjustment end includes
Second collimater and the second plano lens, wherein the first light path is projected and injected by the first plano lens after first collimator is collimated
First decay area；Second light path is exported by the second plano lens after the second collimating device collimation and injects the second decay area.
Further, the first reflection end includes the 3rd plano lens and the first speculum, and it is saturating that the second reflection end includes Siping City
Mirror and the second speculum, wherein the first speculum is arranged on after the 3rd plano lens, the second speculum is arranged on the 4th plano lens
Afterwards；First light path injects the first speculum after the first decay area is decayed from the 3rd plano lens, and the second light path passes through second
After the decay of decay area the second speculum is injected from the 4th plano lens.
Further, first laser adjustment end also includes the first simple lens reshaper, and second laser adjustment end also includes the
Two simple lens reshapers, wherein the first simple lens reshaper is arranged between first collimator and the first plano lens, the first light path
After being collimated through first collimator, laser energy is homogenized through the first simple lens reshaper and is irradiated to the by the first plano lens again
One decay area；Second simple lens reshaper is installed in the second light path between the second collimater and the second plano lens through the second collimater
After collimation, laser energy homogenization is irradiated to the second decay area by the second plano lens again through the second simple lens reshaper.
Further, in addition to data processing section, wherein data processing section and the first detector and the second detector
Electric signal is sent to data processing section and handled by connection, the first detector with the second detector.
A kind of reflection type optical fiber powder concentration measurement system of the present utility model, has the advantages that：
The 1st, directional coupler and reflective measuring method are set, completes to input in a light path using same optical fiber and surveys
The transmission of the laser of part and the laser of output measurement part is measured, it is cost-effective；
2nd, using optical fiber long-distance transmissions optical signal, long-range measurement dust concentration is realized；
3rd, reflective measuring method can double measurement distance, or can make in same measurement distance measurement portion
The volume divided reduces half；
4th, double-optical path method, measurement error is eliminated using calculus of differences, improves measurement accuracy；
5th, energy handling averagely is carried out using the output light of simple lens reshaper collimation device so that for dust concentration
Measurement carried out under equally distributed light field, the non-uniform Distribution problem of dust concentration in the range of measurement space can be improved to surveying
Measure the adverse effect of result；
6th, measurement portion is divided into pure optical texture, is positioned over measure field very safe；
7th, the laser of optical fiber output is expanded using collimater, measured zone sectional area can be improved, it measures knot
Fruit can reflect the average measurement effect of dust concentration in larger space.
Brief description of the drawings
, below will be to embodiment for clearer explanation the utility model embodiment or technical scheme of the prior art
Or the accompanying drawing used required in description of the prior art is briefly described, it is clear that, drawings in the following description are only
It is some embodiments of the present utility model, for those of ordinary skill in the art, is not paying the premise of creative work
Under, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is a kind of composition figure of reflection type optical fiber powder concentration measurement system one embodiment of the present utility model；
Fig. 2 is a kind of measurement part of reflection type optical fiber powder concentration measurement system one embodiment of the present utility model
Composition figure；
Fig. 3 is a kind of composition figure of second embodiment of reflection type optical fiber powder concentration measurement system of the present utility model；
Fig. 4 is a kind of composition figure of the 3rd embodiment of reflection type optical fiber powder concentration measurement system of the present utility model；
Fig. 5 is a kind of composition figure of the 4th embodiment of reflection type optical fiber powder concentration measurement system of the present utility model；
Fig. 6 is a kind of structure chart of the 5th embodiment of reflection type optical fiber powder concentration measurement system of the present utility model；
Fig. 7 is a kind of structure chart of the 6th embodiment of reflection type optical fiber powder concentration measurement system of the present utility model；
Wherein：1- measurements part, 2- light sources part, 3- directional couplers part, 4- signal conversion parts point, 5- optical fiber, 6-
Laser adjustment end, 7- decay areas, 8- reflection ends, the directional couplers of 9- first, the directional couplers of 10- second, the optical fiber of 11- first,
The optical fiber of 12- second, the detectors of 13- first, the detectors of 14- second, the light paths of 15- first, the light paths of 16- second, 17- lasers, 18-
Coupler, 19- beam splitters, 20- first lasers adjustment end, 21- second lasers adjustment end, the decay areas of 22- first, 23- second decline
Subtract area, the reflection ends of 24- first, the reflection ends of 25- second, 26- connecting rods, 27- first collimators, the plano lens of 28- first, 29-
Two collimaters, the plano lens of 30- second, the plano lens of 31- the 3rd, the speculums of 32- first, the plano lens of 33- the 4th, 34- second reflect
Mirror, the first simple lenses of 35- reshaper, 36- the second simple lens reshapers.
Embodiment
Below in conjunction with the accompanying drawing in the utility model, the technical scheme in the utility model embodiment is carried out it is clear,
Complete description, it is clear that described embodiment is only a part of embodiment of the utility model, rather than whole implementation
Example.Based on the embodiment in the utility model, those skilled in the art is not on the premise of creative work is made
The all other embodiment obtained, belongs to protection domain of the present utility model.
As shown in figure 1, a kind of reflection type optical fiber powder concentration measurement system of one embodiment of the present utility model, bag
Include measurement part 1, light source part 2, directional coupler part 3, signal conversion part point 4, light source part 2,4 points of signal conversion part point
It is not connected with directional coupler part 3, measurement part 1 is connected with directional coupler part 3 by optical fiber 5, optical fiber 5 and measurement portion
Connected mode the present embodiment between 1 and directional coupler part 3 is divided not limit, it is preferred that using flange connection.Measurement
Part 1 is located at measure field, and measurement part 1 is away from light source part 2, signal conversion part point 4, directional coupler part 3, due to surveying
Amount part 1 is connected with directional coupler part 3 by optical fiber 5, so optical signal is carried out into long-distance transmissions by optical fiber 5, is grasped
Make personnel only just need to can realize dust concentration in the position operation light source part 2 away from measure field and signal conversion part point 4
Long-range measurement.As shown in Fig. 2 measurement part 1 include laser adjustment end 6, decay area 7, reflection end 8, wherein laser adjustment end 6 with
It is for the under test gas containing dust between reflection end 8 in decay area 7, decay area 7；Light source part 2 produces laser and by laser
Directional coupler part 3 is sent to, laser is sent to measurement portion point 1 by directional coupler part 3 by optical fiber 5, and laser enters
Measurement part 1 measures decay, then vertical injection reflection by the adjustment and then injection decay area 7 of laser adjustment end 6 first
End 8, reflection end 8 is by laser reflection and sequentially passes through after decay area 7, laser adjustment end 6 and to be transmitted back to directional coupler portion by optical fiber 5
Divide 3, the Laser Transmission after reflection to signal conversion part point 4 is so realized that an optical fiber 5 is transmitted past by directional coupler part 3
The purpose of laser is returned, measurement cost has been saved.
Specifically, measurement part 1 also includes connecting rod 26, laser adjustment end 6 is fixed with reflection end 8 by connecting rod 26 to be connected
Connect, keep laser adjustment end 6 and the distance of reflection end 8 not to change.
Specifically, a kind of as shown in figure 3, reflection type optical fiber powder concentration measurement of second embodiment of the present utility model
System, directional coupler part 3 includes the first directional coupler 9 and the second directional coupler on the basis of one embodiment
10, optical fiber 5 includes the first optical fiber 11 and the second optical fiber 12, and signal conversion part point 4 includes the first detector 13 and the second detector
14, the first directional coupler 9, the second directional coupler 10 are connected with light source part 2 respectively, the first directional coupler 9 and first
The head end connection of optical fiber 11, the second directional coupler 10 is connected with the head end of the second optical fiber 12, the first optical fiber 11 and the second optical fiber
12 end is connected with laser adjustment end 6；First detector 13 is connected with the first directional coupler 9, the second detector 14 with
Second directional coupler 10 is connected, and the optical signal received is converted into electric signal by the first detector 13 and the second detector 14.
Light source part 2 produces two beam laser and is transmitted separately to the first directional coupler 9 and the second directional coupler 10, the first directional couple
Device 9 by laser by the first optical fiber 11 transmit to measurement part 1 measure, by reflection end 8 reflect after transmission be back to the first light
Fibre 11, and the first directional coupler 9 is reached, the first directional coupler 9 enters the Laser Transmission after reflection to the first detector 13
Row signal is changed, and laser is transmitted to measurement part 1 and measured by the second directional coupler 10 by the second optical fiber 12, by reflecting
Transmission is back to the second optical fiber 12 after the reflection of end 8, and reaches the second directional coupler 10, and the second directional coupler 10 is by after reflection
Laser Transmission to the second detector 14 carries out signal conversion.It is preferred that, between the first directional coupler 9 and the first detector 13
Coupler is installed, coupler is installed between the second directional coupler 10 and the second detector 14, coupler can realize aggregation light
With the mutual conversion of directional light, the coupler installed at this is used to the laser beam of aggregation changing into approximately parallel laser light
Beam, is easy to the laser after the 14 pairs of measurements of the first detector 13 and the second detector to carry out signal acquisition.
Specifically, a kind of reflection type optical fiber dust concentration of the 3rd embodiment of the present utility model as shown in Figure 4 is surveyed
Amount system, light source part 2 includes laser 17, coupler 18, the beam splitter being sequentially connected on the basis of second embodiment
19, the transmitting laser of laser 17 enters coupler 18, and because the laser that laser 17 is launched is directional light, coupler 18 will can be put down
Row light is transmitted to beam splitter 19 after focusing on.Light beam can be divided into two beams or multi beam by beam splitter 19, have at present 1 × N and 2 ×
N two types, the present embodiment selects 1 × 2 beam splitter 19, and laser is divided into the first light path 15 and the second light path by beam splitter 19
16, the first light path 15 enters the first directional coupler 9, and the second light path 16 enters the second directional coupler 10, is missed to reduce measurement
Difference, from the preferable beam splitter 19 of light splitting uniformity, makes the luminous intensity of the first light path 15 and the second light path 16 more equal；First
Transmitted after the first directional coupler 9 of entrance of light path 15 through the first optical fiber 11 to laser adjustment end 6, the second light path 16 enters second and determined
Transmitted after to coupler 10 through the second optical fiber 12 to laser adjustment end 6.
Specifically, a kind of reflection type optical fiber dust concentration of the 4th embodiment of the present utility model as shown in Figure 5 is surveyed
Amount system, laser adjustment end 6 includes first laser adjustment end 20, second laser adjustment end on the basis of the 3rd embodiment
21,7 points of decay area is the first decay area 22, the second decay area 23, and reflection end 8 includes the first reflection end 24, the second reflection end 25,
Wherein the first decay area 22 is located between the reflection end 24 of first laser adjustment end 20 and first, and the second decay area 23 is located at second and swashed
Between the reflection end 25 of light adjustment end 21 and second；First laser adjustment end 20 is connected with the end of the first optical fiber 11, and second laser is adjusted
Whole end 21 is connected with the end of the second optical fiber 12；First light path 15 is transmitted to first laser adjustment end 20, warp by the first optical fiber 11
First laser adjustment end 20 is transmitted to the first decay area 22 after adjusting to be decayed, and the first light path 15 after measurement decay is vertically penetrated
Enter the first reflection end 24, the second light path 16 is transmitted to second laser adjustment end 21 by the second optical fiber 12, adjusted through second laser
Transmit to the second decay area 23 and decayed after the adjustment of end 21, the second light path 16 after measurement decay vertically injects the second reflection end
25；Light path of first light path 15 in the first decay area 22 is more than light path of second light path 16 in the second decay area 23.The mesh of this case
The dustiness for being to measure under test gas in cavity, so by first laser adjustment end 20, second laser adjustment end 21, first
Reflection end 24, the second reflection end 25 are disposed as the stronger optical path transmission device of closure, in order to eliminate during double-optical path
Differential system error, is identical structure by the structure setting of first laser adjustment end 20 and second laser adjustment end 21, by first
Reflection end 24 is identical structure with the structure setting of the second reflection end 25.First laser adjustment end 20, second is not limited in this case
Laser adjustment end 21, the first reflection end 24, the placement location relation of the second reflection end 25 4, but the first decay area 22 need to be met
Distance be more than the distance of the second decay area 23, and the first light path 15 vertically injects the first reflection end 24, and the second light path 16 is vertical
Inject the second reflection end 25.Because the distance and the distance of the second decay area 23 of the first decay area 22 are unequal, so the first light
Attenuation attenuation with second light path 16 in second decay area 23 of the road 15 in the first decay area 22 is unequal.
Specifically, a kind of reflection type optical fiber dust concentration of the 5th embodiment of the present utility model as shown in Figure 6 is surveyed
Amount system, first laser adjustment end 20 includes the plano lens 28 of first collimator 27 and first, and second laser adjustment end 21 includes the
Two collimaters 29 and the second plano lens 30, the first reflection end 24 include the 3rd plano lens 31 and the first speculum 32, the second reflection
End 25 includes the 4th plano lens 33 and the second speculum 34.The specification and placement direction of the collimater 29 of first collimator 27 and second
All same, the laser for optical fiber to be transmitted expand becoming wide beam light, and the first speculum 32 is arranged on the 3rd plano lens 31
Afterwards, the second speculum 34 is arranged on after the 4th plano lens 33.First light path 15 is injected after first laser adjustment end 20, first
Projected after first collimator 27 is expanded by the first plano lens 28 and inject the first decay area 22, the first light path 15 passes through first
Decay area 22 is injected after decaying from the 3rd plano lens 31 and vertical irradiation is on the first speculum 32；Second light path 16 passes through second
Collimater 29 is exported by the second plano lens 30 after expanding and injects the second decay area 23, and the second light path 16 passes through the second decay area 23
Injected after decay from the 4th plano lens 33 and vertical irradiation is on the second speculum 34.First speculum 32 is anti-by the first light path 15
Sequentially passed through after penetrating and enter the first optical fiber after the 3rd plano lens 31, the first decay area 22, the first plano lens 28, first collimator 27
11, the second speculum 34 sequentially passes through the 4th plano lens 33, the second decay area 23, the second plano lens after second light path 16 is reflected
30th, the second optical fiber 12 is entered after the second collimater 29.Whole measurement part 1 is pure Optical devices, installed in mine or easy hair
Security performance is higher in the measuring environment of event of making trouble.It is preferred that, the plano lens 28 of first collimator 27 and first, the 3rd plano lens
31st, the geometric center of the first speculum 32 is measuring the propagation path phase of part 1 on same straight line, and with the first light path 15
Overlap, the second collimater 29, the second plano lens 30, the 4th plano lens 33, the geometric center of the second speculum 34 are in same straight line
On, and coincided with the second light path 16 in the propagation path measured in part 1, the first light path 15 and the second light path 16 can be made most
Limits by measuring part 1, be reduced as far as loss of the laser in transfer element, it is ensured that the first light path 15 and second
Light path 16 has identical communication environments in transfer element, to improve the precision of powder concentration measurement.
Specifically, a kind of reflection type optical fiber dust concentration of the 6th embodiment of the present utility model as shown in Figure 7 is surveyed
Amount system, first laser adjustment end 20 also includes the first simple lens reshaper 35, and it is single that second laser adjustment end 21 also includes second
Lens reshaper 36, wherein the first simple lens reshaper 35 is arranged between the plano lens 28 of first collimator 27 and first, first
After light path 15 is expanded through first collimator 27, become wide beam light, but be due to that wide beam light after expanding still is Gaussian beam distribution, its
Optical cross-section Energy distribution is uneven, if the decay that the first decay area 22 carries out laser is shone directly into, in later data point
Occurs error during analysis larger, so laser energy spatial distribution is converted into flat-top by Gauss light through the first simple lens reshaper 35
After light, then the first decay area 22 is irradiated to by the first plano lens 28；Second simple lens reshaper 36 is arranged on the second collimater
29 and second between plano lens 30, after the second light path 16 is expanded through the second collimater 29, with the principle of the first simple lens reshaper 35
It is identical, laser energy uniform spatial distributionization is irradiated to second by the second plano lens 30 again through the second simple lens reshaper 36
Decay area 23.First simple lens reshaper 35 and the second simple lens reshaper 36 select identical aspherical lens, lens surface
Design according to use environment depending on, the utility model is not specifically limited, only need to reach collimated Gaussian light is changed into it is parallel
The purpose of flat-top light.To avoid unnecessary error, by between the simple lens reshaper 35 of first collimator 27 and first
Distance is arranged to equal with the distance between the second collimater 29 and the second simple lens reshaper 36.The present embodiment sets the first list
Lens reshaper 35 homogenizes laser energy with the second simple lens reshaper 36, makes the first wide beam light and the second wide beam light
One decay area 22 and decay in the second decay area 23 are more uniform, and then the result for handling later data is more accurate.
Specifically, also including data processing section, data processing section and the first detector 13, second in above example
Detector 14 is connected, and electric signal is sent to data processing section and handled by the first detector 13 with the second detector 14.Number
Calculated according to process part by the electric signal of the conveying of signal conversion part point 4, finally draw laser attenuation coefficient.
The utility model is measured respectively by two-way light under test gas, and calculates laser attenuation according to measurement data
Coefficient, just can be according to certain proportionate relationship because the dust concentration of attenuation coefficient and under test gas has certain proportionate relationship
Calculate the dust concentration of under test gas.Its measurement process of reflection type optical fiber powder concentration measurement system of the present utility model and swash
The specific algorithm of light attenuation coefficient is as follows：
The output light of laser 17 enters beam splitter 19 after coupler is coupled, and laser is divided into the first light by beam splitter 19
The light path 16 of road 15 and second, the first light path 15 is transmitted to first laser adjustment end 20 through the first optical fiber 11, and the second light path 16 is through
Two optical fiber 12 are transmitted to second laser adjustment end 21, and the first light path 15 enters after first collimator 27 is expanded from the first plano lens 28
Project, set the laser intensity projected from the first plano lens 28 as I, the second collimater 29 of the second light path 16 entrance expand after from the
Two plano lens 30 are projected, and set the laser intensity from the injection of the second plano lens 30 as I ', the first light path 15 passes through the first decay area
After 22 decay, reflected and be shining into again behind the first decay area 22 by the first reflection end 24, be irradiated into the light intensity of the first plano lens 28
For I1, after the second wide beam light is decayed by the second decay area 23, reflected by the second reflection end 25 and be shining into the second decay area again
After 23, the light intensity for being irradiated into the second plano lens 30 is I2, the first plano lens 28 and the 3rd it is the distance between flat be l1, second is flat
The distance between plano lens 33 of lens 30 and the 4th is l2, set attenuation coefficient as α, ignore laser except the first decay area 22 with
Decay outside second decay area 23, thenDue to the first light path 15 and the second light path 16
Two-beam is equally divided into by beam splitter 19, and first collimator 27 is identical with the second collimater 29, so I=I ', therefore
Calculate α=ln (I2/I1)/2(l1-l2).Apart from l1With l2During for fixed value, by measuring I1With I2, just can calculate to be measured
Gas is to the attenuation coefficient of laser, because certain dust concentration correspond to certain laser attenuation coefficient, and in practical application
In, the corresponding relation between dust concentration and laser attenuation coefficient can be determined by standard test method, just may be used in the measurements
Dust concentration is calculated according to experiment value.
It is preferred that, 1 × 3 beam splitter is can select, now needs to add the 3rd optical fiber, the 3rd laser adjustment end, the 3rd decay
Area, the 3rd reflection end, the 3rd directional coupler and the 3rd detector, and the 3rd laser adjustment end and first laser adjustment end, the
The light transmission device structure of dual-laser adjustment end is identical, and difference is light path and first light path of the 3rd light path in the 3rd decay area
The light path of light path, the second light path in the second decay area in the first decay area is different, and the 3rd light path that beam splitter is produced is again
By backtracking to the 3rd directional coupler after the 3rd echo area is reflected, the 3rd directional coupler is by the 3rd light after reflection
Road is transmitted to the 3rd detector, and the 3rd detector, which is converted optical signal into after electric signal, to be sent to data processing section, and it is calculated
Method still using being averaged again after Difference Calculation method, can more effectively improve measurement accuracy.
Whole reflection type optical fiber powder concentration measurement system, on the basis of long-range measurement dust concentration is realized, with point
Beam of laser is equally divided into two beams by beam device, and two-beam is injected to the unequal decay area of light path respectively and carries out attenuation measurement, profit
Laser is pressed into backtracking with echo area, transmitted the laser orientation after reflection to signal conversion part by directional coupler part
Point, signal conversion part point converts optical signals to electric signal, and electric signal is inputted to data processing section calculated, finally
Draw the dust concentration of under test gas.Due in this programme in addition to the light path of the first decay area and the second decay area is unequal,
Other measuring environments are identical, so laser attenuation coefficient is calculated using optical path difference in follow-up Difference Calculation, will be all
Error make the difference elimination, the calculated value degree of accuracy of gained is higher.
The utility model is further described by specific embodiment above, it should be understood that, have here
The description of body, should not be construed as the restriction to spirit and scope of the present utility model, and one of ordinary skilled in the art is readding
The various modifications made after reader specification to above-described embodiment, belong to the scope that the utility model is protected.
Claims (9)
1. a kind of reflection type optical fiber powder concentration measurement system, it is characterised in that including measurement part, light source part, orientation coupling
Clutch part, signal conversion part point, the light source part, the signal conversion part point connect with the directional coupler part respectively
Connect, the measurement part is connected with the directional coupler part by optical fiber, the measurement part is located at measure field, described
Measurement is partially away from the light source part, the signal conversion part point, the directional coupler part；The measurement portion point includes
Laser adjustment end, decay area, reflection end, wherein：
It is the gas to be measured containing dust in the decay area, the decay area to be between the laser adjustment end and the reflection end
Body；
The light source part produces laser and laser is sent into the directional coupler part, and the directional coupler part leads to
Cross the optical fiber and laser is sent to the measurement part, laser enters behind the measurement part, adjusted first by the laser
The adjustment at whole end, then injects the decay area and measures decay, then vertically injects the reflection end, and the reflection end will swash
Light reflects and sequentially passes through the decay area, be transmitted back to the directional coupler portion by the optical fiber after the laser adjustment end
Point, the Laser Transmission after reflection to the signal conversion part is divided in the directional coupler part.
2. a kind of reflection type optical fiber powder concentration measurement system as claimed in claim 1, it is characterised in that the directional couple
Device part includes the first directional coupler and the second directional coupler, and the optical fiber includes the first optical fiber and the second optical fiber, described
Signal conversion part point includes the first detector and the second detector, wherein：
First directional coupler, second directional coupler are connected with the light source part respectively, first orientation
Coupler is connected with the head end of first optical fiber, and second directional coupler is connected with the head end of second optical fiber, institute
The first optical fiber is stated to be connected with the laser adjustment end with the end of second optical fiber；
First detector is connected with first directional coupler, second detector and second directional coupler
The optical signal received is converted into electric signal by connection, first detector with second detector.
3. a kind of reflection type optical fiber powder concentration measurement system as claimed in claim 2, it is characterised in that the light source part
Including the laser, coupler, beam splitter being sequentially connected, wherein：
The laser transmitting laser and the incoming beam splitter after coupler coupling, the beam splitter divide laser
For the first light path and the second light path, first light path enter after first directional coupler through first optical fiber transmit to
The laser adjustment end, second light path, which enters to transmit to described through second optical fiber after second directional coupler, to swash
Light adjustment end.
4. a kind of reflection type optical fiber powder concentration measurement system as claimed in claim 3, it is characterised in that the laser adjustment
End includes first laser adjustment end, second laser adjustment end, and the first decay area, the second decay area are divided into the decay, described
Reflection end includes the first reflection end, the second reflection end, wherein：
First decay area is located between the first laser adjustment end and first reflection end, the second decay position
Between the second laser adjustment end and second reflection end；
The first laser adjustment end is connected with first optical fiber connector, the second laser adjustment end and second optical fiber
End is connected；
Transmit to first decay area and decayed after first laser adjustment end adjustment described in first optical routing, measurement declines
First light path after subtracting vertically injects first reflection end, and second laser adjustment end described in second optical routing is adjusted
After transmit to second decay area and decayed, second light path after measurement decay vertically injects second reflection
End；
Light path of first light path in first decay area is more than light path of second light path in second decay area.
5. a kind of reflection type optical fiber powder concentration measurement system as claimed in claim 4, it is characterised in that the measurement part
Also include connecting rod, wherein：
The laser adjustment end is fixedly connected with the reflection end by the connecting rod.
6. a kind of reflection type optical fiber powder concentration measurement system as claimed in claim 5, it is characterised in that the first laser
Adjustment end includes first collimator and the first plano lens, and the second laser adjustment end is flat including the second collimater and second
Mirror, wherein：
First light path, which is projected by first plano lens after first collimator collimation and injects described first, to decline
Subtract area；
Second light path, which is exported by second plano lens after second collimating device collimation and injects described second, to decline
Subtract area.
7. a kind of reflection type optical fiber powder concentration measurement system as claimed in claim 6, it is characterised in that first reflection
End includes the 3rd plano lens and the first speculum, and second reflection end includes the 4th plano lens and the second speculum, wherein：
First speculum is arranged on after the 3rd plano lens, and second speculum is arranged on the 4th plano lens
Afterwards；
First light path injects first speculum, institute after first decay area is decayed from the 3rd plano lens
State the second light path and inject second speculum from the 4th plano lens after second decay area is decayed.
8. a kind of reflection type optical fiber powder concentration measurement system as claimed in claims 6 or 7, it is characterised in that described first
Laser adjustment end also includes the first simple lens reshaper, and the second laser adjustment end also includes the second simple lens reshaper, its
In：
The first simple lens reshaper is arranged between the first collimator and first plano lens, first light path
After being collimated through the first collimator, laser energy is homogenized through the first simple lens reshaper flat by described first again
Lens lighting is to first decay area；
The second simple lens reshaper is arranged between second collimater and second plano lens, second light path
After second collimating device collimation, laser energy is homogenized through the second simple lens reshaper flat by described second again
Lens lighting is to second decay area.
9. a kind of reflection type optical fiber powder concentration measurement system as claimed in claim 8, it is characterised in that at also including data
Part is managed, wherein：
The data processing section is connected with first detector with second detector, first detector with it is described
Electric signal is sent to the data processing section and handled by the second detector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720062226.3U CN206583763U (en) | 2017-01-18 | 2017-01-18 | A kind of reflection type optical fiber powder concentration measurement system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720062226.3U CN206583763U (en) | 2017-01-18 | 2017-01-18 | A kind of reflection type optical fiber powder concentration measurement system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206583763U true CN206583763U (en) | 2017-10-24 |
Family
ID=60109967
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720062226.3U Withdrawn - After Issue CN206583763U (en) | 2017-01-18 | 2017-01-18 | A kind of reflection type optical fiber powder concentration measurement system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206583763U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106769738A (en) * | 2017-01-18 | 2017-05-31 | 西安科技大学 | A kind of reflection type optical fiber powder concentration measurement system |
-
2017
- 2017-01-18 CN CN201720062226.3U patent/CN206583763U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106769738A (en) * | 2017-01-18 | 2017-05-31 | 西安科技大学 | A kind of reflection type optical fiber powder concentration measurement system |
| CN106769738B (en) * | 2017-01-18 | 2022-08-12 | 西安科技大学 | Reflection-type optical fiber dust concentration measuring system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103616165B (en) | Loss measurement of optic fibre system | |
| CN106769738A (en) | A kind of reflection type optical fiber powder concentration measurement system | |
| CN107179132B (en) | Optical fiber image transmission beam velocity interferometer and shock wave velocity calculation method | |
| CN101476978B (en) | Method for measuring geometric parameter of single mode fiber | |
| CN106769736B (en) | Dust concentration measurement system | |
| CN103616164A (en) | Reflectivity and transmittance comprehensive measurement method based on pulse laser light source | |
| CN104698468A (en) | Fiber optic coherent ranging device and method | |
| CN103604773A (en) | Laser beam combiner for simultaneously detecting various types of gas of TDLAS (Tunable Diode Laser Absorption Spectroscopy) | |
| CN108594257A (en) | Tachogenerator and its scaling method based on Doppler effect and measurement method | |
| CN207571026U (en) | A kind of multiple gases telemetry system based on TDLAS | |
| CN206378393U (en) | A kind of optical fiber type apparatus for measuring dust concentration | |
| WO2022082838A1 (en) | Optical detection system | |
| CN104458212A (en) | Device and method for measuring integrated optical waveguide polarization extinction ratio | |
| CN104539349A (en) | Multifunctional laser space communication ground test system and static parameter test method | |
| CN206583763U (en) | A kind of reflection type optical fiber powder concentration measurement system | |
| CN206557059U (en) | A kind of double light path apparatus for measuring dust concentration | |
| CN104456091B (en) | Fiber-optic interferometer CO2 pipe leak detection device based on 3*3 couplers | |
| CN206557060U (en) | A kind of powder concentration measurement system | |
| CN104792732B (en) | A kind of refractometer of distribution of light sources from reference | |
| CN111854958B (en) | Active and passive testing method and system for polarized light transmission characteristics in complex sea fog environment | |
| CN109374914A (en) | Larger Dynamic measurement range all -fiber Doppler speed measuring device | |
| CN206399781U (en) | A kind of apparatus for measuring dust concentration | |
| CN107064539A (en) | A kind of big visual field photon Doppler speed measuring device and method | |
| CN108983253A (en) | A kind of high-precision laser microspur measurement method | |
| CN206573442U (en) | A kind of optical fiber type apparatus for measuring dust concentration |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20171024 Effective date of abandoning: 20220812 |
|
| AV01 | Patent right actively abandoned |
Granted publication date: 20171024 Effective date of abandoning: 20220812 |
|
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |