Description
Areas of application
- Non-contact velocity measurement: Precise measurement of flow velocities and turbulent flow variables.
- Particle properties: Qualitative measurement of particle sizes and concentrations.
- Use in narrow flow channels: Suitable for measurements with limited optical accessibility.
Functionality and advantages
- Measurement principle: Determination of the flow velocity by measuring the time of flight of particles between two focused laser beams.
- Signal processing: Scattered light pulses from particles are optically recorded, amplified and electronically evaluated.
- Statistical evaluation: Average velocities and turbulent fluctuations are calculated by analyzing many particle movements.
- Special advantages:
- Small optical access.
- High signal-to-noise ratio.
- Very small measuring volume, ideal for boundary layer measurements.
Technical details
- Measurement variables:
- Flow velocity.
- Particle concentration.
- Particle size distribution.
- Extensions to the TFD:
- Qualitative measurement of particle size distributions and concentrations.
- Measurement in areas that are difficult to access optically using highly focused laser beams.
