CN201004044Y - Laser granularity distribution tester - Google Patents
Laser granularity distribution tester Download PDFInfo
- Publication number
- CN201004044Y CN201004044Y CNU2006200338682U CN200620033868U CN201004044Y CN 201004044 Y CN201004044 Y CN 201004044Y CN U2006200338682 U CNU2006200338682 U CN U2006200338682U CN 200620033868 U CN200620033868 U CN 200620033868U CN 201004044 Y CN201004044 Y CN 201004044Y
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- tester
- conversion device
- photoelectric conversion
- beam center
- instrument
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Abstract
The utility model relates to a powder granularity distribution tester, in particular to a powder laser granularity distribution tester. As the tester is provided with a polarizing device and a beam center photoelectrical conversion device, thus the light intensity of the tester is adjustable in one hand and the powder amount of a tested area is not reduced, in the other hand the beam center of the tester departures the center hole of the photoelectrical conversion device in a certain degree, thus the tester is able to examine and estimate in accordance with the beam center electric signals and provides convenience to know the situation of the tester and adjust the tester. As the beam center electrical signal contains the information of the tested granule amount, the utility model is favorable to improve testing veracity.
Description
Technical field the utility model is about powder granularity distribution tests instrument, especially about laser particle size distribution tests instrument.
Background technology is that 90214729.3 " laser diffraction formula particle size distribution test instrument ", the patent No.s of putting down in writing are 200420033010.7 records " particle laser particle size distribution tests instrument " or the like just like the patent No. in the laser particle size distribution tests instrument technology of existing powder.Because the many or major general of the powder granule quantity of test surfaces influences the accuracy of instrument test, when the powder granule quantity of test surfaces very little the time, the diffraction light weak output signal that produces, noise increases, when the powder granule quantity of test surfaces is too many, the diffraction light signal that produces is too strong, signal amplifier is satisfied close, and exceeds test specification.Therefore, they are in order to improve the accuracy of instrument test, and normal employing changes the quantity of specimen or changes the method that produces the spraying plant structure and parameter and then change the quantity of specimen makes the powder granule quantity of test surfaces maintain preferable scope.This method exists can only be interrupted the problem that changes test surfaces powder granule quantity and spraying plant structure and parameter change difficulty.In the prior art, the method of the employing adjustment directional light intensity that also has improves the test accuracy of instrument, because it is to adjust directional light intensity with the method that reduces beam diameter, when reducing light intensity, reduce the powder quantity of test area, still can have influence on the accuracy of test.
Summary of the invention task of the present utility model provides a kind of laser particle size distribution tests instrument with light beam polarization device and beam center photoelectric conversion device.
Task of the present utility model is to realize like this.After existing semiconductor laser is as the parallel beam expand device of the laser particle size distribution tests instrument of light source and polarising means is installed between the specimen storehouse, the beam center photoelectric conversion device with luminous reflectanc is installed on the light path of photoelectric conversion device back, the beam center photoelectric conversion device with beam reflection to optical absorption film.The light beam that semiconductor laser sends after parallel beam expand device becomes directional light front illuminated on polarising means, the directional light that passes polarising means is radiated on the tested powder granule in the specimen storehouse again and produces diffraction and scattering, its diffraction light, scattered light and laser beam irradiation focus on condenser lens, diffraction light after the focusing, the scattered light irradiation converts light signal to electric signal on photoelectric conversion device, laser beam after the focusing is passed the photoelectric conversion device center pit and is radiated at and converts the beam center electric signal on the beam center photoelectric conversion device to, and is reflected on the optical absorption film and is absorbed.After electric signal and the amplification of beam center electric signal, the input computing machine is handled, and can test out powder granularity and distribute, and detect the degree that beam center departs from the photoelectric conversion device center pit according to its signal magnitude; Simultaneously, owing in the beam center electric signal, also include the powder granularity test signal, the difference before and after test, in the test also can improve the test accuracy of instrument.
This laser particle size distribution tests instrument that the utility model provides is made up of parallel beam expand device, polarising means, specimen storehouse, condenser lens, photoelectric conversion device, beam center photoelectric conversion device, optical absorption film that semiconductor laser reaches after being installed on successively.The side to light of beam center photoelectric conversion device and light beam are the 45 degree, beam reflection can be absorbed to optical absorption film.
The effect of semiconductor laser is to produce laser beam.
The effect of parallel beam expand device is that the light beam that laser instrument produces is become directional light.
The effect of polarising means is to change laser intensity, regulates the anglec of rotation of polaroid center and beam center, can in very large range regulate the directional light intensity that is radiated on the specimen storehouse, is not radiated at area on the specimen storehouse but do not change directional light.
The effect of condenser lens is that the light beam by the specimen storehouse is focused on.
The effect of photoelectric conversion device is to convert electric signal to by condenser lens and the light signal that is radiated on the photo-electric conversion element on photoelectric conversion device surface, a plurality of photo-electric conversion elements are equipped with on the surface of photoelectric conversion device, and there is a through hole that allows direct light in the light beam pass at the center after the focus place is focused into a bit.
The effect of beam center photoelectric conversion device is that the beam signal that will pass the photoelectric conversion device center pit converts the beam center electric signal to, and a plurality of photo-electric conversion elements are equipped with on its surface, and have catoptrical ability.
The effect of optical absorption film is to absorb light beam.
The advantage of this laser particle size distribution tests instrument that the utility model provides is: because instrument has adopted the structure with polarising means and beam center photoelectric conversion device, on the one hand the light intensity of instrument both can be adjusted, do not reduce the powder quantity of test area again; Make the instrument beam center depart from the degree of photoelectric conversion device center pit on the other hand, size by the beam center electric signal detects judgement, for the state of understanding instrument, the debugging of instrument bring convenience, can provide by side amounts of particles information simultaneously, help improving the test accuracy of instrument.
Appended drawings is a kind of structural representation of this laser particle size distribution tests instrument that provides of the utility model, wherein laser instrument (1), parallel beam expand device (2), polarising means (3), specimen storehouse (4), condenser lens (5), photoelectric conversion device (6), beam center photoelectric conversion device (7), optical absorption film (8).Parallel beam expand device (2), polarising means (3), specimen storehouse (4), condenser lens (5), photoelectric conversion device (6), beam center photoelectric conversion device (7), optical absorption film (8) are installed behind the laser instrument (1) successively.The side to light and the light beam of beam center photoelectric conversion device (7) are 45, beam reflection are gone up to optical absorption film (8) absorb.
A kind of course of work of this laser particle size distribution tests instrument that embodiment the utility model provides is as follows: at first connect instrument power source, by computing machine optimum range is transferred in the working point of amplifier, read the size of coherent signal, then powder sample to be measured is sent into specimen storehouse (4), the light beam that laser instrument (1) produces becomes directional light through parallel beam expand device (2), again after polarising means (3) is adjusted to suitable light intensity, be radiated on the powder in the specimen storehouse (4) and produce diffraction, scattering, its diffraction light, be radiated at after scattered light line focus lens (5) focus on the photo-electric conversion element of photoelectric conversion device (6) and convert light signal to electric signal, another part light beam line focus lens (5) pass photoelectric conversion device (6) after the focus place focuses on center pit is radiated on the photo-electric conversion element of beam center photoelectric conversion device (7) and converts the beam center electric signal to, after at last these two kinds of electric signal being amplified, the input Computer Processing, and compare correction with there not being test intrafascicular electrocardiosignal of powder time, can draw powder granularity distribution tests result.
Claims (1)
- A kind of laser particle size distribution tests instrument, form by parallel beam expand device (2), specimen storehouse (4), condenser lens (5), photoelectric conversion device (6), optical absorption film elements such as (8) that laser instrument (1) reaches after being installed on successively, it is characterized in that: between parallel beam expand device (2) and specimen storehouse (4) polarising means (3) is installed, the beam center photoelectric conversion device (7) that is the 45 degree with light beam is installed on the back light path of photoelectric conversion device (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2006200338682U CN201004044Y (en) | 2006-04-18 | 2006-04-18 | Laser granularity distribution tester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2006200338682U CN201004044Y (en) | 2006-04-18 | 2006-04-18 | Laser granularity distribution tester |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201004044Y true CN201004044Y (en) | 2008-01-09 |
Family
ID=39039585
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2006200338682U Expired - Fee Related CN201004044Y (en) | 2006-04-18 | 2006-04-18 | Laser granularity distribution tester |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201004044Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102735596A (en) * | 2012-06-28 | 2012-10-17 | 河北工业大学 | Laser particle sizer for eliminating center spot of receiving plane |
-
2006
- 2006-04-18 CN CNU2006200338682U patent/CN201004044Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102735596A (en) * | 2012-06-28 | 2012-10-17 | 河北工业大学 | Laser particle sizer for eliminating center spot of receiving plane |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080109 |