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Zhuhai Truth Optical Instrument Co., Ltd
The various components of the laser particle size analyzer are carefully designed
Date: 2025-09-15Read: 0
In the fields of material science, pharmacy, chemical industry and new energy, laser particle size analyzer, with its non-contact, fast and wide range characteristics, has become the core tool for particle size distribution detection of powder, lotion, suspension and other dispersion systems. The measurement accuracy and repeatability of laser particle size analyzer depend on the collaborative operation of multiple precision optical and mechanical components, each of which is carefully designed.
1. Laser light source
Usually, high stability semiconductor lasers (wavelength 635nm or 780nm) are used to emit monochromatic, coherent parallel beams. The light source has stable power and low heat generation, ensuring no drift in light intensity during long-term testing. Some models are equipped with multi light source systems (such as polarized light or dual wavelength) to enhance the resolution of complex samples (such as flakes and highly absorbent particles).
2. Beam collimation system
Composed of a beam expander and a collimating lens, the original laser beam is expanded into parallel light with uniform diameter and small divergence angle, covering the entire sample cell. Ensure stable incident light field, avoid edge diffraction interference, and improve measurement accuracy.
3. Sample dispersion system
Wet circulation pool: equipped with an ultrasonic disperser (adjustable at 40kHz) and a centrifugal pump, allowing particles to fully decompose and aggregate in the liquid medium;
Dry sampler: uses compressed air injection to disperse powder in the airflow.
The pool body is made of high transparency quartz or optical glass, which is corrosion-resistant and has low background interference.
4. Angle detection array
The core component is a multi ring photodetector array, distributed in concentric circles, capable of receiving scattered light signals within the range of 0.02 ° to 145 °. The central detector captures the transmitted light, while the peripheral annular probe records the scattering intensity at different angles. High density sensor layout (up to over 100 channels) ensures full angle information collection and supports Mie theory for accurate inversion of particle size distribution.
5. Optical Fourier lens
Located behind the sample pool, focus light rays with different scattering angles onto the corresponding detector positions. The focal length determines the measurement range - short focal lengths are suitable for large particles, while long focal lengths are beneficial for detecting small particles. Lens coated with anti reflective film reduces light loss and improves signal-to-noise ratio.
6. Data processing system
Built in high-performance processor, running Mie scattering theory or Fraunhofer diffraction model to convert the original light intensity distribution into a particle size volume distribution map. The software provides multiple data analysis modes (such as D10, D50, D90), multi peak recognition and report generation, and supports ISO13320 international standard validation.