Scanning modulation type laser granularity measuring device
A measurement device and particle size technology, which is applied in the field of scanning modulation laser particle size measurement devices, can solve the problems of complex receiving scheme and low anti-interference ability, and achieve the advantages of improved portability, small number of detectors, and high angular resolution Effect
Inactive Publication Date: 2021-02-05
BEIJING CHANGCHENG INST OF METROLOGY & MEASUREMENT AVIATION IND CORP OF CHINA
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Problems solved by technology
[0007] The traditional laser particle size measuring instrument has the disadvantages of complex receiving scheme and low anti-interference ability. The technical problem to be solved by a scanning modulation laser particle size measuring device disclosed by the present invention is: reduce the structural complexity of the laser particle size measuring device , improve the anti-interference ability of the laser particle size measurement device, and also have the advantages of simple structure, small number of detectors, high angular resolution, and simple signal processing process
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Embodiment 1
[0022] Such as figure 2 As shown, a scanning modulation laser particle size measuring device disclosed in this embodiment consists of a light intensity modulation collimating laser 1, a main frame 2, a transparent sample cell 3, a small hole photodetector 4, a scanning motor 5 and supporting Drive, acquisition, signal processing system composition,
[0023] Light intensity modulation collimation laser 1 adopts semiconductor collimation laser with a wavelength of 650nm and an output power of 3mW for light intensity modulation of 39kHz; the transparent sample cell 3 is a thin-walled quartz glass dish with an internal space thickness of 0.5mm; the small hole photodetector 4 The end-window photomultiplier tube R1166 of Hamamatsu Photonics is used, the diameter of the small hole is 1mm; the output AC signal of the small hole photodetector 4 is amplified by a 36kHz-42kHz narrow-band AC amplifier, and is collected by the data acquisition card to the computer for processing; the scan...
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The invention discloses a scanning modulation type laser granularity measuring device, and belongs to the field of material analysis and measurement. The device is mainly composed of a light intensitymodulation collimation laser, a main frame, a transparent sample pool, a small-hole photoelectric detector, a scanning motor and a matched driving, collecting and signal processing system. A mechanical scanning scheme is used for replacing a traditional distributed multi-detector layout scheme, detection of a powder particle diffraction scattering light distribution rule is achieved, and the device has the advantages of simple structure, low cost, small detector number, high angle resolution and simple signal processing process. An alternating current modulated laser light source is used forreplacing a traditional light intensity stable light source, alternating current photoelectric receiving and narrow-band alternating current amplification are achieved, interference of sunlight, illumination light and other environment light on the measurement system is effectively restrained, therefore a dark room and a light shielding structure which are large in size are omitted, the size of the measurement system can be reduced, and portability is improved, and industrial field application and online measurement application in production can be realized.
Description
technical field [0001] The invention relates to a scanning modulation type laser particle size measuring device, which belongs to the field of material analysis and measurement. Background technique [0002] Laser particle size measuring instrument is an important technical means to analyze powder particle size and its distribution. It has high measurement accuracy and wide application range, and is widely used in the field of powder material analysis and production. [0003] The laser particle size measuring instrument works according to the phenomenon of diffraction and scattering of laser light by powder scatterers. The law of diffraction and scattering of light by particles in scatterers can be explained by Fraunhoffer diffraction theory and Mie theory. Its core is to measure the distribution data of powder scatterers diffracted by incident light, and calculate the powder particle size and distribution law accordingly. Therefore, how to accurately obtain the distributi...
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IPC IPC(8): G01N15/02
CPCG01N15/0211
Inventor 李华丰薛景锋
Owner BEIJING CHANGCHENG INST OF METROLOGY & MEASUREMENT AVIATION IND CORP OF CHINA