CN2090056U - Laser particle surveying instrument - Google Patents
Laser particle surveying instrument Download PDFInfo
- Publication number
- CN2090056U CN2090056U CN 91205415 CN91205415U CN2090056U CN 2090056 U CN2090056 U CN 2090056U CN 91205415 CN91205415 CN 91205415 CN 91205415 U CN91205415 U CN 91205415U CN 2090056 U CN2090056 U CN 2090056U
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- photodetector
- particle
- instrument
- utility
- laser
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Abstract
The utility model discloses a laser particle surveying instrument, composed of a laser, a sample cell for the measured granule, a photodetector, an interface circuit and a computer. The mechanical structure of the utility model is greatly simplified and the cost is reduced about two times in the precondition that the precision of measurement of the utility model without using the high-accuracy optical elements as a transformation lens and a spatial filter is as same as that of other instruments. Meanwhile, if only the distance between the sample cell and the photodetector is changed, the measured range can be changed. The operation is convenient. The greatest lower measurement limit of the particle diameter can reach 0.2 micrometer. The utility model has great generalization and use value in many branches for the national economy.
Description
It is the metering outfit of feature that the utility model relates in to adopt optical means, in particular for the measuring instrument of metering particle diameter.
In many departments of national economy, exist a large amount of and the closely-related technical matters of particle diameter, as ceramic powders, dyestuff, coating, kollag, powdery or granular medicament, various emulsifying agents, catalyzer or the like in the chemical industry, measure the diameter of these particulates exactly, great economic benefit and social benefit are arranged improving product quality, raising product yield and performance, reduction energy resource consumption, the pollution that controls environment, guarantee health of human body etc.
In the prior art field, in the instrument of employing optical method for measuring particle size total scattering method, angle scattering method and forward scattering light distribution are arranged.As measuring this class sample of powdery granule, the general at present forward scattering light distribution that adopts is in the majority.The Malvern Particle sizer(Ma Erwen particle-size analyzer that Britain Ma Erwen Instr Ltd. is arranged based on the typical instrument of this method); The FAM laser particle sizer of Shanghai Machinery College.Though these instruments can have higher measuring accuracy in its grain diameter measurement scope (being about 1～1000 micron), but from structural principle, it is the particle diameter of energy measurement below 1 micron not, and owing to used the spatial filtering of laser beam and expanded the complicated light path system and the high-precision optical elements such as Rich Maurier lens of bundle and different focal, the apparatus structure complexity, the cost height.
The purpose of this utility model is: provide a kind of to utilize laser instrument and photodetector, without the measuring fine particles instrument of other optical elements.Thereby the structure of instrument is simplified greatly, handled and calculate, measure the mean diameter and the Size Distribution of particulate samples by computer data.
The technical solution adopted in the utility model is: on the base of instrument, place laser instrument, and photodetector, sample cell is between laser instrument and photodetector.When laser beam irradiation will produce scattering phenomenon during to sample cell that particle is housed, detect the distribution of scattered light by photodetector, interface circuit amplifies the conversion with A/D with the output signal of photodetector, sends into computing machine then.After computing machine carries out data processing and calculating according to the program that weaves in advance, can try to achieve the mean diameter and the Size Distribution of tested particle.
The major advantage of Laser Particle measuring instrument of the present utility model:
1. utilize simple optics and physical construction can reach the measuring accuracy identical with the same quasi-instrument of prior art, because of spatial filtering and expansion bundle and the high-precision Fournier transform lens that do not adopt laser beam, thereby simplified corresponding colimated light system and many mechanical adjustment mechanism, instrument cost reduces nearly two times.
2. sample cell can change according to tested grain size apart from the position of photodetector, any parts in needn't the transposing system, simultaneously, when sample cell during near photodetector, the diameter measurement lower limit of tested particle can reach 0.2 micron, thereby has enlarged the measurement range of lower limit.And the Ma Erwen particle-size analyzer need be changed the Rich Maurier lens of different focal, owing to be subjected to the influence of the focal length of lens, so the smallest particles diameter that it can only be measured is only about 1 micron.
Below in conjunction with accompanying drawing the utility model is described in further detail.
Description of drawings:
The structural representation of Fig. 1, Laser Particle measuring instrument;
The front schematic view of Fig. 2, photodetector;
Fig. 3, interface circuit schematic diagram.
As shown in Figure 1, the light source of measuring instrument is that He-Ne laser instrument 1 is installed on the instrument base 4, sends wavelength and be 0.6328 micron laser, have in the dead ahead of laser beam one with fixture 5 fixing and be installed in photodetector 3 on the base 4. As shown in Figure 2, photodetector 3 usefulness silicon photocells are made, it is made up of 32 semicircular rings, outside by the center, the area of each ring increases successively gradually, black region 9 is the effective area of shining light of each ring among the figure, white line 10 is the insulating barrier between ring and the ring, the effect of photodetector 3 is that the light energy that will shine on each ring is converted to current signal, exported to one group of 4067 analog switch 11 of interface circuit 7 by lead-in wire, the chip selection signal of analog switch 11 is controlled through the output signal of decoder 16 by address wire and the control line of computer 8, channel number is controlled through d type flip flop 15 by data wire, signal carries out the electric current amplification by 7650 amplifiers 12 then, again through the A/D converter 14 of 398 sampling holders 13 and AD574, data after the conversion are read in by computer 8, and computer can adopt Apple II machine, also available PC. After tested particle formulation becomes certain density suspension, be placed in the sample cell 2. Sample cell 2 inserts in the slot of sample cell bases 6, changes it and can realize particle sizing in the different-grain diameter scope in the position of slot. Generally speaking, the distance between sample cell 2 and the photodetector 3 is proportional to tested particle diameter. For example when particle diameter is 0.2～20 micron, sample cell 2 can be placed on apart from 30 millimeters of photodetector 3 and locate on the position, and other by that analogy. When laser beam irradiation will produce scattering phenomenon during to the sample cell that contains particle, according to Michaelis (MieShi) light scattering theory, the distribution of scattered light and particle diameter have definite relation. The distribution of measuring scattered light by photodetector 3, and these data communication devices are crossed interface circuit 7 send into computer 8, computer carries out can obtaining after data are processed and calculated average diameter and the Size Distribution of tested particle according to good program prepared in advance.
Implementation method is as follows:
1. open laser instrument and preheating, allow output power reach stable.Start computing machine, the subroutine of will sampling accordingly and calculation procedure are called in.
2. adjust the relative position of photodetector and laser instrument, make laser beam vertical light electric explorer and make the center of laser beam alignment light electric explorer.
3. generally can to adopt thickness be 5 millimeters cuvette to sample cell.Earlier sample cell is placed on certain position apart from photodetector, and in sample cell, puts into certain amount of fluid.The kind of liquid is decided on the character of tested particle, requires liquid fully to disperse by particle, does not produce any chemistry and physical reactions.For example for most of metals or metal oxide powder, available water is as dispersion liquid.
4. tested powder particle is put into beaker, add an amount of liquid and disperse, also can add a little spreading agent more in case of necessity, be mixed with particle suspension liquid.
5. allow computing machine read in the output signal of the photodetector when having only liquid in the sample cell, this signal has been represented the light intensity of bias light; Suck the particle suspension liquid prepare with dropper then, splash at leisure in the sample cell, reach and allow computing machine read in signal again after stable, this signal has been represented the scattered light distribution situation of particle.
6. after sampling finished, computing machine changed data processing and calculating automatically over to.
Claims (2)
1, a kind of Laser Particle measuring instrument, feature of the present utility model is: between laser instrument and photodetector, the detected current signal of photodetector is sent into computing machine after exporting interface circuit amplification and A/D conversion to by lead-in wire at the sample cell of placing laser instrument, photodetector on the base of instrument, tested particle being housed.
2, measuring instrument according to claim 1, it is characterized in that: photodetector is made with silicon photocell, form by 32 semicircular rings, outside by the center, the area of each ring increases successively gradually, and black region is effective light-receiving area of each ring, and white line is the insulation course of each interannular, interface circuit is made up of the A/D converter of 4067 analog switches, 7650 amplifiers, 398 sampling holders, AD574, d type flip flop, code translator etc., and computing machine can adopt Apple II machine or PC.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91205415 CN2090056U (en) | 1991-04-02 | 1991-04-02 | Laser particle surveying instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91205415 CN2090056U (en) | 1991-04-02 | 1991-04-02 | Laser particle surveying instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2090056U true CN2090056U (en) | 1991-12-04 |
Family
ID=4915293
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 91205415 Withdrawn CN2090056U (en) | 1991-04-02 | 1991-04-02 | Laser particle surveying instrument |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2090056U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107192647A (en) * | 2017-05-11 | 2017-09-22 | 西北大学 | A kind of portable particle flow detector pulsed based on light |
| CN112881245A (en) * | 2021-01-25 | 2021-06-01 | 苏州胤煌精密仪器科技有限公司 | Gap-adjustable sample flow cell structure for image method |
-
1991
- 1991-04-02 CN CN 91205415 patent/CN2090056U/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107192647A (en) * | 2017-05-11 | 2017-09-22 | 西北大学 | A kind of portable particle flow detector pulsed based on light |
| CN112881245A (en) * | 2021-01-25 | 2021-06-01 | 苏州胤煌精密仪器科技有限公司 | Gap-adjustable sample flow cell structure for image method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |