Publication detail

Software-based processing system for phase Doppler systems, Monte Carlo simulatio

JEDELSKÝ, J. MALÝ, M. CEJPEK, O. WIGLEY, G. MEYERS, J.

English title

Software-based processing system for phase Doppler systems, Monte Carlo simulatio

Type

article in a collection out of WoS and Scopus

Language

en

Original abstract

A Monte Carlo simulation of Phase Doppler systems has been developed. It consists of three sections, the droplet flow description, generation of the photomultiplier signals and then their processing to determine droplet velocities and the time shift between the signals from the three scattered light detection apertures. With highly realistic Doppler bursts being simulated and processed, the question arises as to whether the signal processing software could be used to process ‘real-world’ experimental signals. In a preliminary assessment of its capabilities in such a situation, actual spray Doppler signals (from a Dantec fibre-based PDA system with a BSA signal processor) were recorded and used as input to the software signal processor. The signals from the three photomultipliers were input first into a Picoscope and then into the BSA processor. In this way droplet velocities and size estimates would be available from the BSA as control data. The signal outputs were taken as csv files, and input directly into the software signal processor. Initially the software determined the time location of the centre of each signal burst envelop. This approach was shown to measure signal delays from single cycle to multiple cycles. For this experiment, the software was modified by adding a zero-crossing approach to measure the single cycle delays. The introduction of this method should establish the accuracy of the complete software package in the real world as the results from the preliminary experiment show good agreement between the two techniques.

English abstract

A Monte Carlo simulation of Phase Doppler systems has been developed. It consists of three sections, the droplet flow description, generation of the photomultiplier signals and then their processing to determine droplet velocities and the time shift between the signals from the three scattered light detection apertures. With highly realistic Doppler bursts being simulated and processed, the question arises as to whether the signal processing software could be used to process ‘real-world’ experimental signals. In a preliminary assessment of its capabilities in such a situation, actual spray Doppler signals (from a Dantec fibre-based PDA system with a BSA signal processor) were recorded and used as input to the software signal processor. The signals from the three photomultipliers were input first into a Picoscope and then into the BSA processor. In this way droplet velocities and size estimates would be available from the BSA as control data. The signal outputs were taken as csv files, and input directly into the software signal processor. Initially the software determined the time location of the centre of each signal burst envelop. This approach was shown to measure signal delays from single cycle to multiple cycles. For this experiment, the software was modified by adding a zero-crossing approach to measure the single cycle delays. The introduction of this method should establish the accuracy of the complete software package in the real world as the results from the preliminary experiment show good agreement between the two techniques.

Keywords in English

processing system, phase Doppler system

Released

23.11.2021

Publisher

TU Liberec

Location

Liberec

Book

Proceedings of the International conference Experimental Fluid Mechanics 2021

Edition number

1

Pages from–to

1–6

Pages count

6

BIBTEX


@inproceedings{BUT175972,
  author="Jan {Jedelský} and Milan {Malý} and Ondřej {Cejpek} and Graham {Wigley} and James F. {Meyers},
  title="Software-based processing system for phase Doppler systems, Monte Carlo simulatio",
  booktitle="Proceedings of the International conference Experimental Fluid Mechanics 2021",
  year="2021",
  month="November",
  pages="1--6",
  publisher="TU Liberec",
  address="Liberec"
}