Study on broadening the size range in laser particle size measurement by combined spectrum technology

Yong-jie Wei; Wen-chao Li; Bao-zhen Ge; Yao-lin Wei

doi:10.1117/12.805542

2 February 2009 Study on broadening the size range in laser particle size measurement by combined spectrum technology

Yong-jie Wei, Wen-chao Li, Bao-zhen Ge, Yao-lin Wei

Proceedings Volume 7160, 2008 International Conference on Optical Instruments and Technology: Optoelectronic Measurement Technology and Applications; 71601E (2009) https://doi.org/10.1117/12.805542
Event: International Conference of Optical Instrument and Technology, 2008, Beijing, China

Abstract

In laser particle size measurement, the instrument based on traditional Fourier transform structure is disadvantaged in the narrow measurable dynamic size range. So it is hardly to be used to measure broadly distributed particle. The presented technology is based on Fresnel diffraction theory. The formula of combined spectrum technology by detecting signals on coaxial focal planes is educed. In the proposed method, the two lenses are set coaxially and signals are detected on the back focal plane of the first lens and the combined back focal plane of the two lenses. The detected signals are then combined. The data are processed with a no-model algorithm. Thus, the measurable dynamic range can be broadened as no component of the sizer is changed. Experimental results of some samples show that the particulate in the size range of 5 ~ 3500 µm can be measured simultaneously.

Citation Download Citation

Yong-jie Wei, Wen-chao Li, Bao-zhen Ge, and Yao-lin Wei "Study on broadening the size range in laser particle size measurement by combined spectrum technology", Proc. SPIE 7160, 2008 International Conference on Optical Instruments and Technology: Optoelectronic Measurement Technology and Applications, 71601E (2 February 2009); https://doi.org/10.1117/12.805542

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KEYWORDS

Particles

Signal detection

Diffraction

Laser applications

Sensors

Detector arrays

Lenses

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