Winner2005The fully automatic wide distribution wet laser particle size analyzer, as an intelligent detection device for micro and nano particles, integrates core technologiesMieThe scattering theory and unconstrained free inversion technique have achieved accurate measurement of widely distributed particle populations. This article systematically elaborates on the technical characteristics and maintenance points of the instrument from two dimensions: principle analysis and accuracy maintenance.

1、 Core detection principle

1. Full rangeMieScattering technique

This instrument adopts632.8nm He-NeAs a light source, when a laser beam irradiates a group of particles, the scattered light intensity distribution generated by the particles shows a nonlinear relationship with the particle size. By designing a focused Fourier transform optical path, the limitation of traditional lens aperture on scattering angle can be overcome, allowing for complete data collection0.1-300MmScattering signals at all angles within the full range. Compared to the approximate Mie theory model, this technique uses an unconstrained free inversion algorithm to directly invert the true particle size distribution without the need for pre-set particle distribution functions.

2. Dual beam orthogonal compensation system

Innovatively adopting dual beam orthogonal technology, the main detection beam and compensation beam form90The angle of ° effectively eliminates the Doppler frequency shift error caused by particle Brownian motion. When detecting0.6MmWhen dealing with submicron particles, this design can improve the signal-to-noise ratio40%Ensure the detection limit of nanoscale particles.

3. Intelligent decentralized coupling technology

Built in three-level decentralized system:40kHzUltrasonic dispersion eliminates aggregates,3000rpmMechanical stirring ensures suspension uniformity,8L/minThe circulating pump achieves dynamic sample updates. Three dispersion methods work together to achieve particle dispersionD90<1.2Effectively avoid measurement deviation caused by sedimentation of large particles.

2、 Key technologies for maintaining accuracy

1. Optical path automatic calibration system

The optical path centering device driven by a precision four phase hybrid stepper motor can achieve micrometer level positioning accuracy. Automatically execute the optical path calibration program upon daily startup, and control the optical axis deviation by detecting the symmetry of the standard particle scattering spectrum±2MradWithin, ensure the repeatability error of long-term measurements<0.3%.

2. Full range dynamic calibration

Adopting micrometer level technology（GBW120011）Submicron scale（NIST SRM 1690）Nano scale（ERM-FD100）Grade III standard substance, with full range coverage calibration conducted monthly. Especially for0.6-120MmThe main detection interval adopts a segmented progressive calibration method to ensure the accuracy of each range segmentD50bias<0.2%.

3. Environmental adaptability design

Built in temperature and humidity compensation module, capable of automatic correction20-25℃、30-70%RHMeasurement errors caused by changes in environmental parameters. When the ambient temperature fluctuates>±2At ℃, the system automatically startsPIDTemperature control to stabilize the operating temperature of the laser at22±0.5℃, ensuring laser wavelength stability better than ±0.02nm.

This instrument utilizes innovative principles and precise design to apply in cement, ceramics, pharmaceuticals, and other fields30Stable applications have been achieved in multiple industries. By strictly following the maintenance process of daily light path inspection, weekly standard substance verification, and monthly deep cleaning, users can ensure the long-term maintenance of the instrument<0.5%The measurement accuracy provides reliable data support for product quality control.