BGD 249 Laser Particles Size Analyzer is a new cost-effective laser particle size analyzer

designed by Biuged R&D department. It is used to measure the particle size distribution of powder or

latex.

Test Principle： Light is an electromagnetic wave. When light meets with particles on it way of

traveling, the interaction between light and particles will result in deviations of part of the light, which iscalled light scattering. The bigger the scattering angle is, the particle size will be smaller, the smaller

the scattering angle is, the particle size will be bigger. The particle analyzer instruments will analysis

the particle distribution according to this physical character of the light wave.

Features:

Reliable optical platform
◆ Use horizontal straight light path layout, no reflecting prism, light path is stable and reliable.
◆ Good designability for base, good consistency of light path.
◆ Anti-moist ability of laser power module and the stability of electric are better.
◆ Modular construction design, maintenance is more convenient.
◆ The testing performance for small particles is improved.
◆ The all-in-one housing design, it’s dust-protected and water-proof.

Schematic diagram of optical path
◆ Totally enclosed design of light path system, dust pollution and external light pollution can be

prevented.
◆ Light path adopts lens back Fourier transform structure.
◆ Optical source adopts He-Ne laser emitter which owns better monochromaticity, high coherence,

small divergence angle and good stability  compared  to other laser emitters, we also adopt the patent design of integrated laser emitter which reduces heat  distortion of laser tube and external

mechanical vibration.
◆ For laser emitter, except for traditional detection of output power value, we add the stability test of output power. 
◆ Smoothing processing technology is used to reduce the impact of power fluctuation to

measurement.
◆ Constant current limit and filling process of laser tube are used to reduce the flash frequency to the minimum.
◆ Backward detector is added, the lower limit of measurement is extended to 0.1 micron.
◆ Spatial filter is fixed by powerful permanent magnet, the pinhole is not easy to shift under the

disturbance of external force, so the  stability of the optical path has been greatly improved. Besides,

the new designed spatial filter eliminates the laser diffraction ring   more effectively, the light

background of the instrument is lower, optical energy data  is more accurate, it is helpful to improve

the  testing capability for large particles.
◆ Detector array adopts unique scattered light detection around a sphere surface （DAS）, the large angle detectors  are placed in a spherical surface to get accurate focus of the large angle scattered

light.

Advanced data collection and processing technology
◆ New designed data collecting board uses 32 bit CPU from famous chip design company-ARM,the CPU has the advantages of high-effective signal processing capacity and low power 
consumption.
◆ Using 8-channel simultaneous sampling to sample 16 bit ADC, the sampling frequency of frame

data can reach 1 kHz.
◆ Using 64-channel simultaneous sampling technology and sample & hold switch with ultralow

leakage current, the full scale accuracy can  reach 0.15%.
◆ Easy to update the firmware and layout data, more convenient for maintenance and operation
◆ Offset function of electric background, it can help to get more accurate optical energy data.