CN203310726U - Multi-point measurement device for multi-refractive-index particle diameters based on optical fiber connection - Google Patents
Multi-point measurement device for multi-refractive-index particle diameters based on optical fiber connection Download PDFInfo
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- CN203310726U CN203310726U CN2013203881859U CN201320388185U CN203310726U CN 203310726 U CN203310726 U CN 203310726U CN 2013203881859 U CN2013203881859 U CN 2013203881859U CN 201320388185 U CN201320388185 U CN 201320388185U CN 203310726 U CN203310726 U CN 203310726U
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Abstract
The utility model discloses a multi-point measurement device for multi-refractive-index particle diameters based on optical fiber connection. The multi-point measurement device comprises a light source module, multiple particle detection probe modules, a signal central processing host, light source transmission optical fibers and data transmission lines, wherein the multiple particle detection probe modules are respectively connected with the light source module by the light source transmission optical fibers, and the multiple particle detection probe modules are respectively connected with the signal central processing host by the data transmission lines. According to the utility model, an optical fiber transmission laser is adopted as a light source of particle detection probes, the particle detection probes carry out sampling introduction by using independent air pumps, and scattering signals are transmitted to a processing terminal to realize the unified analysis and processing of data. Compared with current a multi-point acquisition system, the multi-point measurement device disclosed by the utility model has the advantages that stronger modularization can be achieved, and the system is divided into the light source, the detection probes and the signal processing terminal, therefore, the versatility of the system is enhanced, and the replacement of each device is easier; the spatial distribution distance detected by the probes is also increased, therefore, the multi-point measurement device is suitable for detection on particles in a large spatial range.
Description
Technical field
The utility model relates to a kind of multimetering system of Optical Fiber Transmission laser as grain diameter monitoring probe light source of usining, system is subjected to the impact of particle refractive index less on the testing result of grain diameter, in order to realize, in larger environment, the multiple spot of particle particle diameter is measured simultaneously, and reduced the error that variable grain species (refractive index difference) causes measurement result.
Background technology
In the actual production life, can distribute more and more important by Real-Time Monitoring particulate in air particle diameter.At present, monitoring particulate in air particle diameter distribute the method that usually adopts both at home and abroad be by a master control system will be placed on each point telotism corpuscular counter or relatively the particle sensor of designs simplification couple together, the signal that each point corpuscular counter or sensor detect is processed to main frame by data line or wireless way for transmitting.
Japan RION company has also developed corresponding multi-point sampling measuring system (RP-Monitor K9461 and RP Monitor EVO K0505), and this system can couple together the particle sensor of Multiple Type.If but this method easy to carry out a large amount of point measurements cost can greatly improve.The particle sensor that the Lighthouse of the U.S. " laser particle monitoring system " monitoring section is installed, each sensor adopts arbitrary source, and its air-channel system need to be provided by independent vacuum pump, has limited the service range of particle sensor, is only applicable to the monitoring of zonule.Germany WALAS company has also developed the multi-point sampling instrument of a series of (Welas Digital1000/2000/3000 and Promo System2000/3000 series).This system is also by optical fiber, scattering light source to be imported in particle sensor and by optical fiber scattered light is directly conducted out.With the Lighthouse " laser particle monitoring system " of the U.S., this system also need to be provided by independent vacuum pump, has limited the service range of particle sensor.If will detecting, the multi-point sampling pick-up unit of Lighthouse and WALAS company needs many air pumps, light source and host computer control on a large scale.
At home, Soviet Union letter cleaning equipment factory " multipoint mode clean environment monitoring system " is similar to the multi-point sampling measuring system of Japanese RION company, and the particle sensor of Multiple Type is coupled together and detects.Suzhou Hua Da company limited has also released " BCJ-DD type multiple spot monitoring system ", be similar to the Lighthouse " laser particle monitoring system " of the U.S., but each sensor has independently light source and air pump, adopts wireless telecommunications.The particle sensor structure relative complex of this system, cost is relatively higher, and owing to adopting wireless biography, defeated signal easily is interfered.China space cleaning equipment company limited produces cleanliness factor multiple spot detection system, each probe be also that a relatively complete counter of function has independently light source and air pump and, with display, is connected with main frame by data line.Particle sensor structure in said system is all remarkable, does not possess the characteristics of particle particle multiple spot detection system sensing probe modularization, simplification.
The utility model content
For above-mentioned prior art, the utility model provides a kind of multiple refractive index grain diameter Multi point measuring apparatus connected based on optical fiber, adopt the light source of Optical Fiber Transmission laser as the particle detection probe, the particle detection probe adopts independently air pump sample introduction, and scattered signal is transferred to the unified analyzing and processing that processing terminal is realized data.Compare current multipoint acquisition system, the utility model modularization is stronger, and system has been divided into to light source, detecting head, signal processing terminal.So both strengthened the versatility of system, the replacing of each several part device becomes and is more prone to; Also improve the space distribution distance that probe detects, be adapted at carrying out in the large space scope detection of particle.
The light path design of the particle detection probe that the utility model patent adopts is suitable for the detection to multiple refractive index particle size distribution, compare the detection probe of current other system, have in the detection of multiple refractive index particle, grain diameter measurement degree of accuracy as a result is higher, the characteristics that applicability is wider.Be suitable for the particle size distribution of particulate component complex condition in air ambient is measured.
In order to solve the problems of the technologies described above, the technical scheme that the multiple refractive index grain diameter Multi point measuring apparatus that the utility model connects based on optical fiber is achieved is: comprise light source module, a plurality of particle detection probe module, signal central authorities processing host, light sources transmit optical fiber, data line, a plurality of particle detection probe modules are connected with described light source module by light sources transmit optical fiber respectively, and a plurality of particle detection probe modules are connected by the central processing host of data line and described signal respectively; Described light source module comprises light source and dimmer, and described dimmer is for making the input light intensity of each particle detection probe module consistent; Described particle detection probe module comprises beam shaping device, measures cavity and sealed support, in described measurement cavity, be provided with photoelectric commutator and spherical reflector, between described photoelectric commutator and light source module, be provided with pre-amplification circuit and A/D converter spare, with described measurement cavity runs through, be provided with the sample gas passage for delivery of particle, described sample gas passage consists of sample gas inlet channel and sample gas outlet passageway, and described sample gas outlet passageway is successively by leading to the outside of described measurement cavity after flowmeter, filter membrane and air pump; Described sealed support is used for plugging meter cavity and fixedly pre-amplification circuit and A/D converter spare; Described beam shaping device is shaped as parallel beam for the diverging light that the light sources transmit Optical Fiber Transmission is come; Described spherical reflector is used for collecting particle scattering light, and this scattered light is converged on photoelectric commutator; Described photoelectric commutator and described spherical reflector center conllinear, being centered close on the picture point of spherical reflector to the workspace imaging of the photosensitive area of described photoelectric commutator; Described pre-amplification circuit and A/D converter are used for current pulse signal is converted to digital signal, then are transferred to signal central authorities processing host through data line; Between the beam inlet of described beam shaping device and described measurement cavity, be provided with diaphragm; The beam outlet place of described measurement cavity is provided with light trapping, between described light trapping and described signal central authorities processing host, be connected with signal feedback optical fiber, the beam Propagation that described light trapping will not be scattered is in signal feedback optical fiber, and described signal feedback optical fiber is connected to signal central authorities processing host.
Further, it is 35～50 ° that the center of described spherical reflector receives scattering angle, is preferably 40 °, and the catoptron half-angle is 34～45 °, is preferably 39 °.
Compared with prior art, the beneficial effects of the utility model are:
The particle state multipoint detection device that this optical fiber connects is the domestic report of wanting to have no, and adopts modular design, and it respectively forms the module section functional independence, and the effect of light source module is: the first provides the scattered light light source to every light source beam Transmission Fibers; It two is that acknowledge(ment) signal central authorities processing host sends and the particle detection probe module input light intensity regulating amount come, and the input light intensity of regulating the corresponding particle detection probe module of feedback signal, make the input light intensity intensity of each particle detection probe module consistent.Light sources transmit optical fiber plays connection function: scattered light signal is produced to required light source and from light source module, be transmitted to the particle detection probe module.The effect of feedback signal optical fiber is: the light without scattering that light trapping is received is transferred to the processing of signal central processing module.The particle detection probe module mainly comprises with the battery-driven independently air pump that is placed in the particle detection probe module, photodetector and attached pre-amplification circuit and light emitting devices thereof, and its effect is: the scattered light signal of induction particle.Each particle detection probe module has each personal battery-driven independently air pump that is placed in the particle detection probe module, has overcome the restriction that aforementioned part system is brought by the gas circuit conduit.Signal central authorities processing host Main Function is: the particle scattering signal that the first is sensed each point particle detection probe module focuses on, and analyzes each point distribution of particles situation on every side; It two is that preset should be to the scattered light intensity intensity of particle detection probe module input, and by light sources transmit optical fiber, import light intensity according to the next feedback signal computational analysis of feedback signal Optical Fiber Transmission is current, and then calculate the regulated quantity of light intensity and this regulated quantity is sent to light source module.
Based on angular scattering method measurement particle size distribution, affected by the particle refractive index very large, during general the particle sizing to certain refractive index of this quasi-instrument, can obtain accurate result, on precision, have very large room for promotion for the existing detecting instrument of the different particle of refractive index common in air.For these five kinds of particles that refractive index is different of water common in air, sulfuric acid, ammonium sulfate, carbon black and metallic copper, through numerical simulation, find by optimizing scattered light receiving angle scope, can reduce the impact of particle refractive index on the grain diameter measurement result, thereby improve the precision of particle grain diameter measurement.
At present, to the light path part of the probe of such measuring system, many producers mainly receive the scattered signal in the certain limit centered by 90 ° of scattering angle.And the utility model preferably be take 40 ° of scattering angle and is receiving center, catoptron half-angle (receiving aperture half-angle) is preferably 39 °, by simulation, obtain under this structure the particle particle diameter testing result difference that five kinds of refractive indexes common in air are different little, measuring accuracy is higher.Fig. 4-1 shows the figure as a result of 40 ° of scattering angle, and Fig. 4-2 show the figure as a result of 90 ° of scattering angle; Draw thus, this light channel structure detects optional two kinds of refractive index particle aluminium oxide and silit after national standard Substance P SL demarcates, obtained measurement result preferably.The utility model, by the optimization to the probe segment light channel structure, can make system obtain relatively accurate result to the detection of multiple refractive index grain diameter, has expanded the sensing range of this system, has improved antijamming capability and the relative accuracy of this system.
Adopt optical fiber to connect light source, processing terminal and probe, each several part adopts modular design, versatility that can the height-adjusting system device, be convenient to adjustment and the exchange of system device, can increase as required or reduce probe quantity, the damage of indivedual probes can not have influence on the normal operation of whole system, each several part is the division of labor separately independently, be independent of each other, can conveniently replace when certain a part of damage, reduced the cost of multiple spot detection system in the practice process.。Adopt in addition optical fiber to realize the transmission of signal, each probe adopts independently gas circuit can make system adapt to the needs of telemeasurement.
Adopt new probe light path design, can reduce the impact that testing result is subjected to the particle refractive index, improve measuring accuracy.Scatter light flux to the different particle of species refractive index common in atmosphere---particle diameter corresponding relation is simulated at different scattered light receiving angles.Wherein as shown below in the analog result that receives the position of scattering angle centered by 40 °, the dispersion degree of measuring curve with other receiving angles contrast (only providing the analog result of receiving angle centered by 90 ° of scattering angle that other system adopts here) is lower, and measuring error is less.In real system checking, adopt the calibrated probe of standard particle, close with its nominal value to the measurement result of the particulate alumina of other refractive indexes, silit, verified the feasibility of scheme.
The accompanying drawing explanation
Fig. 1 is the structural representation of the utility model based on the particle state multipoint detection device of optical fiber connection;
Fig. 2 be in the utility model the particle detection probe module overlook cross-section structure and index path;
Fig. 3 be particle detection probe module shown in Figure 2 face cross-section structure and pneumatic diagram;
Fig. 4-1st, the corresponding curve map of the scatter light flux that scattering angle is 40 °-particle diameter;
Fig. 4-2nd, the corresponding curve map of the scatter light flux that scattering angle is 90 °-particle diameter.
Wherein: 1, light source module, 2, the particle detection probe module, 3, signal central authorities processing host, 4, light sources transmit optical fiber, 5, data line, 6, pre-amplification circuit and A/D converter, 7, photoelectric commutator, 8, sealed support, 9, diaphragm, 10, light trapping, 11, spherical reflector, 12, photosensitive area, 13, beam shaping device, 14, light beam, 15, sample gas outlet passageway, 16, flowmeter, 17, filter membrane, 18, air pump, 19, sample gas inlet channel, 20, particle to be checked, 21, sample gas, 22, clean gas flow, 23, measure cavity, 24, feedback signal optical fiber, 25, signal transmssion line.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in detail.
Mentality of designing of the present utility model is: based on optical fiber, connect design, by optical fiber, scattered light signal is produced to required light source and be transmitted to the particle detection probe module from light source module that particle scattering is provided is the light source needed.If any the photosensitive area of particle through probe, the particle detection probe receives the particle scattering light signal and is converted into the electric signal amplification through photoelectric commutator, electric signal transforms device by A/D and is converted to digital signal, then is transmitted in signal central authorities processing host and supplies host analysis to process the data of a position and form particle state to distribute through data line.Can be by the reception of light trapping without the light of scattering, and to signal central authorities, process host process by the feedback signal Optical Fiber Transmission, in order to produce the light intensity regulating amount and to send to light source module.Light source module receives from signal central processing module equipment and sends and next light intensity regulating amount, and the input light intensity of the corresponding particle detection probe module of conditioning signal feedback optical fiber, make the input light intensity of each particle detection probe module consistent.The user can select the length of data line to regulate the service range of particle detection probe module according to actual conditions.
As shown in Figure 1, a kind of multiple refractive index grain diameter Multi point measuring apparatus connected based on optical fiber of the utility model, comprise light source module 1, a plurality of particle detection probe module 2, signal central authorities processing host 3, light sources transmit optical fiber 4, data line 5, a plurality of particle detection probe modules 2 are connected with described light source module 1 by light sources transmit optical fiber 4 respectively, and a plurality of particle detection probe modules 2 are connected by the central processing host 3 of data line 5 and described signal respectively.
Described light source module 1 comprises light source and dimmer, and described light source can be selected in the high power light source of all energy by Optical Fiber Transmission, such as being high power laser light source, high power xenon lamp light source; Described dimmer is for making the input light intensity of each particle detection probe module 2 consistent, described dimmer can open or cut out needs a few bundle optical fiber in this light sources transmit optical fiber of regulating to make its unlatching or stop transmission light source, in order to conditioning signal, feeds back in this way the input light intensity of the corresponding particle detection probe module of optical fiber.
Described particle detection probe module 2 comprises beam shaping device 13, measure cavity 23 and sealed support 8, in described measurement cavity 23, be provided with photoelectric commutator 7 and spherical reflector 11, between described photoelectric commutator 7 and light source module 1, be provided with pre-amplification circuit and A/D converter spare 6, with described measurement cavity 23 runs through, be provided with the sample gas passage for delivery of particle, described sample gas passage consists of sample gas inlet channel 19 and sample gas outlet passageway 15, described sample gas outlet passageway 19 is successively by flowmeter 16, the outside of leading to described measurement cavity 23 after filter membrane 17 and air pump 18.
The central processing host 3 of described signal is selected the high-performance computer.
Described light sources transmit optical fiber 4 can import to the high-strength light of light source module in particle detection probe module 2 exactly and have the optical fiber of less loss and decay; Every light sources transmit optical fiber 4 consists of some bundle optical fiber, its objective is by the dimmer of light source module 1 and opens or stop the wherein transfer function of a few bundle optical fiber to light source, be used to regulating the input light intensity of corresponding particle detection probe module.
Described pre-amplification circuit and A/D converter 6 be for current pulse signal is converted to digital signal, then be transferred to signal central authorities processing host 3 through data line 5; Described data line can be selected the signal wire of RS-485 standard.
Described sealed support 8 is used for plugging meter cavity 23 and fixedly pre-amplification circuit and A/D converter spare 6.
Described photoelectric commutator 7 and described spherical reflector 11 center conllinear, on the picture point that is centered close to 11 pairs of workspace imagings of spherical reflector of the photosensitive area 12 of described photoelectric commutator 7; Thereby forgiving, described air pump 18 allly can for particle detection probe module air path part, provide draught head to form to sweep along the device of particle air-flow to be measured, such as micro air pump, and aerofoil fan; Described air pump 18 is by the storage battery power supply that is placed in the particle detection probe module.Because instrument adopts light scattering principle, air pump 18 becomes the thread line by air to be measured and crosses the measurement cavity, meets in the position, photosensitive area with the light beam of measuring in cavity, and the scattered light that each particle produces receives with the current impulse form.It is 35～50 ° that described spherical reflector 11De center receives scattering angle, is preferably 40 °, and the catoptron half-angle is 34～45 °, is preferably 39 °.
Described beam shaping device 13 is shaped as parallel beam for the diverging light that 4 transmission of light sources transmit optical fiber are come; Described spherical reflector 11 is be used to collecting particle scattering light, and this scattered light is converged on photoelectric commutator 7; Between the beam inlet of described beam shaping device 13 and described measurement cavity 23, be provided with diaphragm 9, described diaphragm 9 is for reducing parasitic light, the beam outlet place of described measurement cavity is provided with light trapping 10, as shown in Figure 2, between described light trapping 10 and described signal central authorities processing host 3, be connected with signal feedback optical fiber 24, the light that described feedback signal optical fiber 24 will not be scattered exactly is transferred to signal central authorities' processing host 3 and has the optical fiber of less loss and decay; The beam Propagation that described light trapping 10 will not be scattered is in signal feedback optical fiber 24, and described signal feedback optical fiber 24 is connected to signal central authorities processing host 3.
Characteristics of the present utility model are the luminous source optical fibers that need while utilizing optical fiber to transmit particle scattering; Each particle detection probe module 2 has independently air pump 18 and with the storage battery power supply that is placed in particle detection probe module 2; Light source module 1 can receive the input light intensity that light intensity regulating amount that signal central authorities processing host 3 sends is regulated every bundle optical fiber.Compared with the prior art have following advantage: the required light source of particle detection probe module 2 is by Optical Fiber Transmission, particle counting device different from the past provides light source by independent laser instrument etc., can simplify the required structure of particle detection probe module, reduced the volume and weight of probe, reduced cost, made the sonde configuration degree of modularity higher.
In the utility model, light source module 1 produces the larger laser of power by high power semiconductor lasers, through optical element, separate the light beam 14 that the multi beam light intensity is identical, every Shu Guang is transferred to the light source needed as particle scattering in particle detection probe module 2 by light sources transmit optical fiber 4.A light source module 1 can provide some aplanatic light beams 14, all can input corresponding particle detection probe module 2 by optical fiber, has reduced the cost of whole device, makes more easily dismounting replacement of probe.Particle detection probe module 2 all has independently air pump 18 and makes each particle detection probe module 2 to work alone with the storage battery power supply that is placed in particle detection probe module 2, is not subjected to the restriction of gas circuit.Light source module 1 has input light dimmer to 2 corresponding light source input optical fibres of each particle detection probe module, can receive the light intensity regulating amount that signal central authorities processing host 3 sends, the input light intensity of the corresponding particle detection probe module of conditioning signal feedback optical fiber, make the input light intensity of each particle detection probe module basically identical.
The method step that utilizes the above-mentioned multiple refractive index grain diameter Multi point measuring apparatus connected based on optical fiber to measure is as follows:
What Fig. 2 showed particle detection probe module 2 overlooks cross-section structure and index path, the light beam that light source module 1 produces is transferred in particle detection probe module 2 by light sources transmit optical fiber 4, at first light beam passes through the shaping of beam shaping device 13, pass through again described spherical reflector 11, around the focus of spherical reflector 11, that is to say 12 places, photosensitive area (wherein cross represents the direction of air-flow)
As shown in Figures 2 and 3, described air pump 18 produces environment under low pressure in described photosensitive area 12, under the effect of pressure reduction, described sample gas 21 enters sample gas inlet channel 19, described sample gas 21 is sweeping along particle 20 to be checked to advance, when described particle 20 to be measured enters into photosensitive area 12, through light beam irradiates, produce scattered light, sample gas 21 and particle to be checked 20 by photosensitive area 12 are discharged particle detection probe module 2 after described sample gas outlet passageway 15, wherein, flowmeter 16 is be used to measuring the air-flow size be used to analyzing air inflow, filter membrane 17 pollutes to reduce for elimination particle to be checked, last comparatively clean air-flow 22 passes through independently air pump 18 and discharges particle detection probe modules 2.
If there is particle to enter into particle detection probe module 2, photosensitive area 12 through spherical reflector 11, and produce corresponding scattered light signal, scattered light is poly-to described photoelectric commutator 7 through the reflection of described spherical reflector 11, the electric signal produced by described photoelectric commutator 7 is converted to digital signal through described preposition amplification and A/D converter 6, this digital signal is sent in the central processing host 3 of described signal in order to analyzing and processing by data line 5, the data processed result obtained is stored in signal central authorities processing host 3 and shows by its display.Meanwhile, the light beam 14 be not scattered is transferred in described feedback signal optical fiber 24 by described light trapping 10, to eliminate the noise produced by the light beam 14 be not scattered, the light beam 14 be not scattered simultaneously is input in the central processing host 3 of described signal by feedback signal optical fiber 24 as feedback signal, by routine processes, analyze the light intensity intensity of light beam 14 and the difference of preset strength, calculate input light intensity regulating amount, then this regulated quantity is sent in light source module 1 by signal transmssion line 25.Light source module 1 is by the transfer function of a few bundle optical fiber to light source in this light sources transmit optical fiber 4 of opening or closing conditioning signal feedback optical fiber 24 correspondences, reach the input light intensity of the corresponding particle detection probe module 2 of conditioning signal feedback optical fiber 24, make the input light intensity of each particle detection probe module basically identical.The central processing host 6 of described signal can preset should be to the scattered light intensity intensity (generally being made as identical) of particle detection probe module 2 inputs, receive described feedback signal optical fiber 24 transmission and next light signal, and according to the light intensity intensity data set in advance, utilize the input light intensity of the dimmer adjusting particle detection probe module 2 in described light source module 1.
The utility model provides each component function of a kind independent, structural module and by the particle multipoint detection device of optical fiber connecting components.This device has simple in structure, easy for installation, and use cost is low, applied range, the characteristics that antijamming capability is strong.Wherein adopt the catoptron center to receive 40 ° of signals of scattering angle, the design that the catoptron half-angle is 39 °, can reduce the error that particle refractive index difference causes the particle size distribution measurement result.
Above-described embodiment only is explanation technical conceive of the present utility model and characteristics; its purpose is to allow the personage who is familiar with this art can understand content of the present utility model and be implemented; can not limit protection domain of the present utility model with this; all equivalences of doing according to the utility model Spirit Essence change or modify, and all should be encompassed in protection domain of the present utility model.
Claims (3)
1. multiple refractive index grain diameter Multi point measuring apparatus connected based on optical fiber, comprise light source module (1), it is characterized in that, also comprise a plurality of particle detection probe modules (2), signal central authorities processing host (3), light sources transmit optical fiber (4), data line (5), a plurality of particle detection probe modules (2) are connected with described light source module (1) by light sources transmit optical fiber (4) respectively, and a plurality of particle detection probe modules (2) are connected with described signal central authorities' processing host (3) by data line (5) respectively;
Described light source module (1) comprises light source and dimmer, and described dimmer is for making the input light intensity of each particle detection probe module (2) consistent;
Described particle detection probe module (2) comprises beam shaping device (13), measure cavity (23) and sealed support (8), in described measurement cavity (23), be provided with photoelectric commutator (7) and spherical reflector (11), between described photoelectric commutator (7) and light source module (1), be provided with pre-amplification circuit and A/D converter spare (6), with described measurement cavity (23) runs through, be provided with the sample gas passage for delivery of particle, described sample gas passage consists of sample gas inlet channel (19) and sample gas outlet passageway (15), described sample gas outlet passageway (19) is successively by flowmeter (16), the outside of leading to described measurement cavity (23) after filter membrane (17) and air pump (18),
Described sealed support (8) is used for plugging meter cavity (23) and fixedly pre-amplification circuit and A/D converter spare (6);
Described beam shaping device (13) is shaped as parallel beam for the diverging light that light sources transmit optical fiber (4) transmission is come; Described spherical reflector (11) is be used to collecting particle scattering light, and this scattered light is converged on photoelectric commutator (7);
Described photoelectric commutator (7) and described spherical reflector (11) center conllinear, being centered close on the picture point of spherical reflector (11) to the workspace imaging of the photosensitive area (12) of described photoelectric commutator (7);
Described pre-amplification circuit and A/D converter (6) be for current pulse signal is converted to digital signal, then be transferred to signal central authorities processing host (3) through data line (5);
Between the beam inlet of described beam shaping device (13) and described measurement cavity (23), be provided with diaphragm (9); The beam outlet place of described measurement cavity is provided with light trapping (10), between described light trapping (10) and described signal central authorities' processing host (3), be connected with signal feedback optical fiber (24), the beam Propagation that described light trapping (10) will not be scattered is in signal feedback optical fiber (24), and described signal feedback optical fiber (24) is connected to signal central authorities processing host (3).
2. the multiple refractive index grain diameter Multi point measuring apparatus connected based on optical fiber according to claim 1, is characterized in that, it is 35～50 ° that the center of described spherical reflector (11) receives scattering angle, and the catoptron half-angle is 34～45 °.
3. the multiple refractive index grain diameter Multi point measuring apparatus connected based on optical fiber according to claim 2, is characterized in that, it is 40 ° that the center of described spherical reflector (11) receives scattering angle, and the catoptron half-angle is 39 °.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103364316A (en) * | 2013-06-29 | 2013-10-23 | 天津大学 | Multi-refractive index particle size multi-point measurement device and method based on optical fiber connection |
| US11320360B2 (en) | 2018-08-31 | 2022-05-03 | Particle Measuring Systems, Inc. | Fluid refractive index optimizing particle counter |
-
2013
- 2013-06-29 CN CN2013203881859U patent/CN203310726U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103364316A (en) * | 2013-06-29 | 2013-10-23 | 天津大学 | Multi-refractive index particle size multi-point measurement device and method based on optical fiber connection |
| CN103364316B (en) * | 2013-06-29 | 2015-04-08 | 天津大学 | Multi-refractive index particle size multi-point measurement device and method based on optical fiber connection |
| US11320360B2 (en) | 2018-08-31 | 2022-05-03 | Particle Measuring Systems, Inc. | Fluid refractive index optimizing particle counter |
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