The time-shift technique for measurement size of non-transparent spherical particles

Walter Schäfer; Cameron Tropea

doi:10.1117/12.2063342

6 August 2014 The time-shift technique for measurement size of non-transparent spherical particles

Walter Schäfer, Cameron Tropea

Proceedings Volume 9232, International Conference on Optical Particle Characterization (OPC 2014); 92320H (2014) https://doi.org/10.1117/12.2063342
Event: International Conference on Optical Particle Characterization (OPC 2014), 2014, Tokyo, Japan

Abstract

In this study we introduce the time-shift technique, also known as the pulsed-displacement technique, as a means of measuring size and velocity of spherical particles. The measurement technique is not new, it has been introduced by Semidetnov^[1] in 1985 and more generally discussed by Hess and Wood^[2], Lin et al^[3], Damaschke et al.^[4] and Albrecht et al^[5]. The novelty introduced in this study is the application of the technique to measure non-transparent particles, which are quite common for example in spray drying processes or in paint sprays. In this contribution the basic working principle of the time-shift technique will be reviewed and an optical configuration suitable for the measurement of non-transparent droplets will be presented. The signal generation and processing will be discussed. Example measurements in a milk spray are presented.

Citation Download Citation

Walter Schäfer and Cameron Tropea "The time-shift technique for measurement size of non-transparent spherical particles", Proc. SPIE 9232, International Conference on Optical Particle Characterization (OPC 2014), 92320H (6 August 2014); https://doi.org/10.1117/12.2063342

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